CN110317411B - Ethylene propylene rubber insulating material for rail transit cable and preparation method thereof - Google Patents
Ethylene propylene rubber insulating material for rail transit cable and preparation method thereof Download PDFInfo
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- CN110317411B CN110317411B CN201810278228.5A CN201810278228A CN110317411B CN 110317411 B CN110317411 B CN 110317411B CN 201810278228 A CN201810278228 A CN 201810278228A CN 110317411 B CN110317411 B CN 110317411B
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- ethylene propylene
- rubber
- propylene rubber
- insulating material
- rail transit
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- 229920000181 Ethylene propylene rubber Polymers 0.000 title claims abstract description 155
- 239000011810 insulating material Substances 0.000 title claims abstract description 133
- 238000002360 preparation method Methods 0.000 title abstract description 21
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical group C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims abstract description 73
- 238000004073 vulcanization Methods 0.000 claims abstract description 65
- 239000007787 solid Substances 0.000 claims abstract description 48
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000003063 flame retardant Substances 0.000 claims abstract description 43
- 230000002195 synergetic effect Effects 0.000 claims abstract description 34
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 229920001971 elastomer Polymers 0.000 claims description 97
- 230000007246 mechanism Effects 0.000 claims description 46
- 238000002156 mixing Methods 0.000 claims description 33
- 239000000126 substance Substances 0.000 claims description 31
- 239000003963 antioxidant agent Substances 0.000 claims description 30
- 230000003078 antioxidant effect Effects 0.000 claims description 30
- 239000003795 chemical substances by application Substances 0.000 claims description 25
- 239000003431 cross linking reagent Substances 0.000 claims description 25
- 239000002245 particle Substances 0.000 claims description 21
- 150000002978 peroxides Chemical class 0.000 claims description 21
- 230000000704 physical effect Effects 0.000 claims description 21
- 238000001914 filtration Methods 0.000 claims description 20
- 238000001816 cooling Methods 0.000 claims description 19
- 238000001125 extrusion Methods 0.000 claims description 18
- 238000004806 packaging method and process Methods 0.000 claims description 17
- BIKXLKXABVUSMH-UHFFFAOYSA-N trizinc;diborate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]B([O-])[O-].[O-]B([O-])[O-] BIKXLKXABVUSMH-UHFFFAOYSA-N 0.000 claims description 17
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical class [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 15
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical class [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 claims description 15
- UJOHNXQDVUADCG-UHFFFAOYSA-L aluminum;magnesium;carbonate Chemical compound [Mg+2].[Al+3].[O-]C([O-])=O UJOHNXQDVUADCG-UHFFFAOYSA-L 0.000 claims description 14
- ZPPSOOVFTBGHBI-UHFFFAOYSA-N lead(2+);oxido(oxo)borane Chemical compound [Pb+2].[O-]B=O.[O-]B=O ZPPSOOVFTBGHBI-UHFFFAOYSA-N 0.000 claims description 14
- 150000001875 compounds Chemical class 0.000 claims description 13
- ODUCDPQEXGNKDN-UHFFFAOYSA-N nitroxyl Chemical compound O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 claims description 12
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- ZPOLOEWJWXZUSP-AATRIKPKSA-N bis(prop-2-enyl) (e)-but-2-enedioate Chemical compound C=CCOC(=O)\C=C\C(=O)OCC=C ZPOLOEWJWXZUSP-AATRIKPKSA-N 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000012188 paraffin wax Substances 0.000 claims description 8
- 229920001296 polysiloxane Polymers 0.000 claims description 8
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 claims description 7
- 239000012774 insulation material Substances 0.000 claims description 7
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- JJRDRFZYKKFYMO-UHFFFAOYSA-N 2-methyl-2-(2-methylbutan-2-ylperoxy)butane Chemical compound CCC(C)(C)OOC(C)(C)CC JJRDRFZYKKFYMO-UHFFFAOYSA-N 0.000 claims description 6
- BXAAQNFGSQKPDZ-UHFFFAOYSA-N 3-[1,2,2-tris(prop-2-enoxy)ethoxy]prop-1-ene Chemical compound C=CCOC(OCC=C)C(OCC=C)OCC=C BXAAQNFGSQKPDZ-UHFFFAOYSA-N 0.000 claims description 6
- 235000019271 petrolatum Nutrition 0.000 claims description 6
- HQOVXPHOJANJBR-UHFFFAOYSA-N 2,2-bis(tert-butylperoxy)butane Chemical compound CC(C)(C)OOC(C)(CC)OOC(C)(C)C HQOVXPHOJANJBR-UHFFFAOYSA-N 0.000 claims description 5
- LSXWFXONGKSEMY-UHFFFAOYSA-N di-tert-butyl peroxide Chemical compound CC(C)(C)OOC(C)(C)C LSXWFXONGKSEMY-UHFFFAOYSA-N 0.000 claims description 4
- 239000000779 smoke Substances 0.000 abstract description 45
- 238000012545 processing Methods 0.000 abstract description 12
- 230000007774 longterm Effects 0.000 abstract description 5
- 229910052736 halogen Inorganic materials 0.000 abstract description 3
- 150000002367 halogens Chemical class 0.000 abstract description 3
- 229920002943 EPDM rubber Polymers 0.000 description 89
- 239000000178 monomer Substances 0.000 description 47
- 239000000463 material Substances 0.000 description 38
- OJOWICOBYCXEKR-KRXBUXKQSA-N (5e)-5-ethylidenebicyclo[2.2.1]hept-2-ene Chemical group C1C2C(=C/C)/CC1C=C2 OJOWICOBYCXEKR-KRXBUXKQSA-N 0.000 description 37
- 239000003921 oil Substances 0.000 description 32
- 238000012360 testing method Methods 0.000 description 32
- -1 allyl ester Chemical class 0.000 description 19
- 238000005469 granulation Methods 0.000 description 18
- 230000003179 granulation Effects 0.000 description 18
- 239000002480 mineral oil Substances 0.000 description 18
- 235000010446 mineral oil Nutrition 0.000 description 18
- 239000005977 Ethylene Substances 0.000 description 17
- 239000005662 Paraffin oil Substances 0.000 description 16
- 230000000694 effects Effects 0.000 description 15
- 230000008859 change Effects 0.000 description 14
- 238000002485 combustion reaction Methods 0.000 description 14
- 230000032683 aging Effects 0.000 description 12
- 230000002401 inhibitory effect Effects 0.000 description 11
- 238000009413 insulation Methods 0.000 description 11
- 238000007654 immersion Methods 0.000 description 10
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 10
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 8
- 239000002253 acid Substances 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 238000007599 discharging Methods 0.000 description 8
- 239000006087 Silane Coupling Agent Substances 0.000 description 7
- 230000004913 activation Effects 0.000 description 7
- 239000003054 catalyst Substances 0.000 description 7
- 238000000354 decomposition reaction Methods 0.000 description 7
- 238000009826 distribution Methods 0.000 description 7
- 238000010292 electrical insulation Methods 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 238000009835 boiling Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 6
- 239000004014 plasticizer Substances 0.000 description 6
- 230000008961 swelling Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 239000000306 component Substances 0.000 description 4
- HQQADJVZYDDRJT-UHFFFAOYSA-N ethene;prop-1-ene Chemical group C=C.CC=C HQQADJVZYDDRJT-UHFFFAOYSA-N 0.000 description 4
- 238000003801 milling Methods 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 4
- 238000007254 oxidation reaction Methods 0.000 description 4
- 238000000746 purification Methods 0.000 description 4
- 238000009461 vacuum packaging Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000003712 anti-aging effect Effects 0.000 description 2
- 230000009849 deactivation Effects 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000001629 suppression Effects 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- PRBHEGAFLDMLAL-GQCTYLIASA-N (4e)-hexa-1,4-diene Chemical group C\C=C\CC=C PRBHEGAFLDMLAL-GQCTYLIASA-N 0.000 description 1
- RYPKRALMXUUNKS-UHFFFAOYSA-N 2-Hexene Natural products CCCC=CC RYPKRALMXUUNKS-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- DPUXQWOMYBMHRN-UHFFFAOYSA-N hexa-2,3-diene Chemical compound CCC=C=CC DPUXQWOMYBMHRN-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000004200 microcrystalline wax Substances 0.000 description 1
- 235000019808 microcrystalline wax Nutrition 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000010057 rubber processing Methods 0.000 description 1
- 238000010092 rubber production Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Ethene-propene or ethene-propene-diene copolymers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/28—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances natural or synthetic rubbers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2217—Oxides; Hydroxides of metals of magnesium
- C08K2003/2224—Magnesium hydroxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/38—Boron-containing compounds
- C08K2003/387—Borates
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Organic Insulating Materials (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses an ethylene propylene rubber insulating material for a rail transit cable and a preparation method thereof, wherein the ethylene propylene rubber insulating material comprises the following raw materials in formula: 100 parts by mass of ethylene propylene rubber; 0.5 to 4 parts by mass of a vulcanization system; 130-170 parts by mass of a flame retardant system; 0.5 to 4 parts by mass of a protection system; 13-30 parts by mass of a synergistic system; wherein the ethylene propylene rubber comprises solid ethylene propylene rubber and liquid ethylene propylene rubber. The invention provides an ethylene propylene rubber insulating material for a rail transit cable and a preparation method thereof, wherein the insulating material has low smoke density and good oil resistance, improves the stable and reliable performance and the processing performance of the ethylene propylene rubber insulating material, meets the requirements of GB/T28429-2012 direct current traction power cables and accessories of 1500V and below for rail transit, has long-term working temperature of 125 ℃, and has excellent comprehensive performance, flame retardance, no halogen and low smoke.
Description
Technical Field
The invention belongs to the technical field of cable materials, and particularly relates to an ethylene propylene rubber insulating material for a rail transit cable and a preparation method thereof.
Background
The ethylene propylene rubber insulating material is a core component of the ethylene propylene rubber insulated rubber jacketed cable, has good electrical insulation performance, and also has good performances of heat resistance, air aging resistance, ozone resistance and the like, but the ethylene propylene rubber material is poor in flame resistance and easy to burn in air.
The existing few enterprises at home and abroad research the problems of lower insulation resistance, higher water absorption performance, higher smoke density, overlarge acid gas release index and the like when specific cable products are applied, and if the cable products are produced by using the defective materials, hidden quality hazards can be buried for the insulation performance of the cables, so that the normal operation of the whole electric equipment power system is influenced, and the urban rail transit industry is particularly influenced.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art and provides an ethylene propylene rubber insulating material for a rail transit cable and a preparation method thereof.
The technical scheme adopted for solving the technical problem of the invention is to provide an ethylene propylene rubber insulating material for a rail transit cable, which comprises the following raw materials in formula:
wherein the ethylene propylene rubber comprises solid ethylene propylene rubber and liquid ethylene propylene rubber.
The synergistic system is a system with the function of inhibiting the smoke density from being larger during smokeless combustion.
Preferably, the third monomer of the solid ethylene propylene rubber is ethylidene norbornene, the content of the third monomer of the solid ethylene propylene rubber is 9.5 to 12mol percent, the content of ethylene monomer is 55 to 62mol percent, and the content of propylene monomer is 29 to 33mol percent. After the ethylene propylene diene monomer with higher content of solid Ethylidene Norbornene (ENB) is vulcanized by a vulcanization system, a mineral oil resistance test (GB/T2951.21-2008) is carried out, and the result shows that the change rate of mechanical properties before and after oil immersion is very low, which indicates that the ethylene propylene monomer with higher vulcanization degree can be obtained after the vulcanization of the solid Ethylidene Norbornene (ENB); better electrical insulation properties are obtained with ethylene propylene diene monomer having a high ethylene content and little or no residual metal catalyst, preferably with the solid ethylene propylene diene monomer being Royalene 547 and/or Buna G3963.
Preferably, the Mooney viscosity ML of the solid ethylene propylene rubber 1+4,121℃ 38 to 55.ML (ML) 1+4,121℃ Refers to preheating for 1 minute at 121 ℃ and running for 4 minutes. The ethylene propylene rubber with low Mooney viscosity is selected, so that good processability can be obtained.
Preferably, the third monomer of the liquid ethylene propylene rubber is ethylidene norbornene, the third monomer content of the liquid ethylene propylene rubber is 7-12 mol%, the ethylene monomer content is 50-75 mol%, and the propylene monomer content is 25-50 mol%.
Preferably, the liquid ethylene propylene rubber has a Brookfield viscosity of 100000mPa.s to 1770000 Pa.s and a viscosity average molecular weight of 3000 to 80000. Preferably, the liquid ethylene propylene diene monomer is Trilene 77. Compared with a small molecular weight paraffin oil plasticizer in the raw material formula of the ethylene propylene rubber insulating material in the prior art, the plasticizer is not added in the raw material formula of the ethylene propylene rubber insulating material, but liquid ethylene propylene diene monomer with higher molecular weight is selected, so that the operation and the processing of the solid ethylene propylene diene monomer during mixing can be easier, and the mineral oil resistance and the heat resistance grade of the insulating material are improved; the mineral oil resistance test (GB/T2951.21-2008) is carried out on the ethylene propylene rubber insulating material prepared by adding the liquid ethylene propylene diene monomer, and the change rate of mechanical properties of the ethylene propylene rubber insulating material before and after the oil immersion test is small, so that the insulating material added with the high molecular weight liquid ethylene propylene diene monomer has oil resistance stability compared with the insulating material added with the low molecular weight paraffin oil. When the ethylene propylene rubber insulating material prepared by adding the liquid ethylene propylene diene monomer is subjected to a high-temperature hot air aging test (GB/T2951.12-2008), the change rate of mechanical properties of the ethylene propylene rubber insulating material before and after the test is smaller, which indicates that the insulating material added with the high-molecular-weight liquid ethylene propylene diene monomer has higher heat resistance grade than the insulating material added with the low-molecular-weight paraffin oil; compared with small molecular weight paraffin oil, the high molecular weight liquid ethylene propylene diene monomer rubber forms an interpenetrating network structure with the solid ethylene propylene diene monomer rubber during blending to obtain an insulating material, and the insulating material is not easy to extract and migrate under the conditions of mineral oil and higher temperature and is more resistant to oxidation of thermo-oxidative free radicals.
Preferably, the vulcanization system comprises a dialkyl peroxide-based vulcanizing agent and/or an allyl ester-based vulcanization co-crosslinking agent.
Preferably, the vulcanization system comprises dialkyl peroxide vulcanizing agent and allyl ester vulcanization auxiliary crosslinking agent, and the mass ratio is (2.5% -4%): (1% -2%).
Preferably, the dialkyl peroxide vulcanizing agent comprises one or more of di-tert-amyl peroxide, di-tert-butyl peroxide and 2, 2-bis (tert-butylperoxy) butane;
the allyl ester vulcanization aid cross-linking agent comprises diallyl fumarate and/or tetraallyloxyethane. The dialkyl peroxide vulcanizing agent with the half-life decomposition temperature of more than 190 ℃ in 1min is more favorable for ethylene propylene rubber granulation; the allyl ester vulcanization auxiliary cross-linking agent with the boiling point higher than 120 ℃ is selected, so that the extrusion granulation of the ethylene propylene rubber is facilitated, the problem of scorching of rubber during processing is avoided, and meanwhile, the self-crosslinking deactivation of the allyl ester vulcanization auxiliary cross-linking agent is avoided. The vulcanization system and the ethylene propylene diene monomer are subjected to vulcanization reaction to obtain the insulating material, and swelling test is carried out on the insulating material, so that the result shows that the swelling rate is lower.
Preferably, the flame retardant system comprises one or more of modified magnesium hydroxide, modified aluminum hydroxide and modified hydrated aluminum magnesium carbonate. The surface of the modified magnesium hydroxide, the modified aluminum hydroxide and the modified hydrated aluminum magnesium carbonate is subjected to activation treatment by a silane coupling agent, so that the contact interface compatibility of a flame-retardant system and ethylene propylene rubber can be promoted, the compatible gap between the two materials is reduced, and the overall electrical property of the material is improved.
Preferably, the flame retardant system has a particle size distribution maximum diameter of 10nm and an effective chemical content of not less than 99.5mas%.
Preferably, the protection system comprises a chemical action mechanism protection system and a physical action mechanism protection system, and the mass ratio is (1% -2.5%): (2% -4%).
Preferably, the chemical mechanism protection system comprises a ketoamine antioxidant and/or a hindered phenol antioxidant; the physical action mechanism type protection system comprises microcrystalline paraffin with a melting point of 80-100 ℃ and/or petroleum jelly with a low molecular weight of 5000-12000.
Preferably, the ketoamine antioxidant is one or more of an antioxidant AW, an antioxidant BLE and an antioxidant DD.
The chemical action mechanism type protection system mainly plays a remarkable role in protecting the heat resistance, ozone resistance and fatigue resistance of the ethylene propylene rubber insulating material, and prolongs the service life of the ethylene propylene rubber insulating material. The physical action mechanism type protection system is separated out to the surface of the ethylene propylene diene monomer rubber insulating material to cover the surface of the rubber through physical action, so that the ageing resistance of the rubber is improved, and meanwhile, the ethylene propylene diene monomer rubber insulating material is softened to be more beneficial to extrusion granulation.
Preferably, the synergistic system comprises one or more of anhydrous zinc borate, anhydrous lead borate and anhydrous organic silicone.
Preferably, the synergistic system comprises anhydrous zinc borate, anhydrous lead borate and anhydrous organosilicone, wherein the mass ratio of the anhydrous zinc borate to the anhydrous lead borate to the anhydrous organosilicone is (15% -25%): (0.005% -0.01%): (8% -15%).
The synergistic system material is also a micromolecular material which is not easy to volatilize, has the effect of inhibiting the smoke density from being larger during smokeless combustion, can promote the insulating material and smoke dust to solidify into carbon crust, has the heat insulation effect, and almost has no acid gas release at the same time because the synergistic system contains no water.
The invention also provides a preparation method of the ethylene propylene rubber insulating material for the rail transit cable, which comprises the following steps:
(1) Mixing by an internal mixer: mixing the weighed and proportioned raw materials in an internal mixer to obtain a mixed rubber, wherein the mixing temperature is 125-135 ℃;
(2) Filtering by a rubber filter: putting the mixed rubber into a rubber filter for extrusion and filtration;
(3) Granulating by an extruder: adding the filtered rubber compound into a single-screw reciprocating rubber extruder for vulcanization and pelleting to obtain rubber particles, wherein the temperature in the rubber extruder is controlled at 120-135 ℃;
(4) And (5) heat drying and packaging: and the rubber particles enter a sealed air cooling pipeline, are dried by hot air, and are vacuum-packed after being cooled. Preferably, the hot air is purified hot air.
Compared with the prior art, the preparation method of the ethylene propylene rubber insulating material for the rail transit cable omits the working procedures of open mill thin-pass cooling, three-roller page milling forming, two-stage banburying and vulcanizing, two-stage open mill thin-pass cooling, two-stage three-roller page milling forming and the like, and the steps of filtering by the rubber filter in the step (2), granulating by the rubber extruder in the step (3) and heat drying and packaging are all carried out in a sealed ultra-purification air cooling pipeline, so that the uncertainty of mixing impurities in the manufacturing process is greatly reduced, the purification degree of the insulating material is improved, and the exceeding of the partial discharge of the material is avoided.
According to the preparation method of the ethylene propylene rubber insulating material for the rail transit cable, disclosed by the invention, the mixing temperature of the internal mixer is close to the granulating temperature of the rubber extruder, so that cooling is not needed, the process steps are saved, and the production efficiency is improved.
The invention provides an ethylene propylene rubber insulating material for a rail transit cable and a preparation method thereof, wherein the insulating material has low smoke density and good oil resistance, improves the stable and reliable performance and the processing performance of the ethylene propylene rubber insulating material, meets the requirements of GB/T28429-2012 direct current traction power cables and accessories of 1500V and below for rail transit, has long-term working temperature of 125 ℃, and has excellent comprehensive performance, flame retardance, no halogen and low smoke.
Drawings
FIG. 1 is a scanning electron microscope image of an ethylene propylene rubber insulating material for a track traffic cable according to an embodiment 5 of the present invention after combustion;
fig. 2 is a process flow chart of the preparation method of the ethylene propylene rubber insulating material for the track traffic cable in the embodiment 5 of the invention.
Detailed Description
The present invention will be described in further detail below with reference to the drawings and detailed description for the purpose of better understanding of the technical solution of the present invention to those skilled in the art.
Example 1
The embodiment provides an ethylene propylene rubber insulating material for a rail transit cable, which comprises the following raw materials in formula:
wherein the ethylene propylene rubber comprises solid ethylene propylene rubber and liquid ethylene propylene rubber. The synergistic system is a system with the function of inhibiting the smoke density from being larger during smokeless combustion.
The embodiment also provides a preparation method of the ethylene propylene rubber insulating material for the rail transit cable, which comprises the following steps:
(1) Mixing by an internal mixer: mixing the weighed and proportioned raw materials in an internal mixer to obtain a mixed rubber, wherein the mixing temperature is 125-135 ℃;
(2) Filtering by a rubber filter: putting the mixed rubber into a rubber filter for extrusion and filtration;
(3) Granulating by an extruder: adding the filtered rubber compound into a single-screw reciprocating rubber extruder for vulcanization and pelleting to obtain rubber particles, wherein the temperature in the rubber extruder is controlled at 120-135 ℃;
(4) And (5) heat drying and packaging: and the rubber particles enter a sealed air cooling pipeline, are dried by hot air, and are vacuum-packed after being cooled.
Compared with the prior art, the preparation method of the ethylene propylene rubber insulating material for the rail transit cable omits the working procedures of open mill thin-pass cooling, three-roller page milling forming, two-stage banburying and vulcanizing, two-stage open mill thin-pass cooling, two-stage three-roller page milling forming and the like, and the steps of filtering by the rubber filter in the step (2), granulating by the rubber extruder in the step (3) and heat drying and packaging in the step (4) are all carried out in a closed ultra-purification air cooling pipeline, so that the uncertainty of mixing of impurities in the manufacturing process is greatly reduced, the purification degree of the insulating material is improved, and the exceeding of partial discharge of the material is avoided.
According to the preparation method of the ethylene propylene rubber insulating material for the rail transit cable, the mixing temperature of the internal mixer is close to the granulating temperature of the rubber extruder, so that cooling is not needed, the process steps are saved, and the production efficiency is improved.
The embodiment provides the ethylene propylene rubber insulating material for the rail transit cable and the preparation method thereof, wherein the insulating material has low smoke density and good oil resistance, the stable and reliable performance and the processing performance of the ethylene propylene rubber insulating material are improved, the requirements of GB/T28429-2012 direct current traction power cables and accessories of 1500V and below for rail transit are met, the long-term working temperature reaches 125 ℃, and the ethylene propylene rubber insulating material has excellent comprehensive performance, is flame-retardant, halogen-free and low in smoke.
Example 2
The embodiment provides an oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for a rail transit cable, which comprises the following raw materials in formula:
wherein the ethylene propylene rubber comprises solid ethylene propylene rubber and liquid ethylene propylene rubber.
The synergistic system is a system with the function of inhibiting the smoke density from being larger during smokeless combustion.
In this embodiment, the third monomer of the solid ethylene propylene rubber is ethylidene norbornene, the content of the third monomer of the solid ethylene propylene rubber is 9.5mol%, the content of ethylene monomer is 60mol%, and the content of propylene monomer is 33mol%. After the ethylene propylene diene monomer with higher content of solid Ethylidene Norbornene (ENB) is vulcanized by a vulcanization system, a mineral oil resistance test (GB/T2951.21-2008) is carried out, and the result shows that the change rate of mechanical properties before and after oil immersion is very low, which indicates that the ethylene propylene monomer with higher vulcanization degree can be obtained after the vulcanization of the solid Ethylidene Norbornene (ENB); ethylene propylene diene monomer having a high ethylene content and little or no residual metal catalyst gives better electrical insulation properties, preferably the solid ethylene propylene diene monomer is Royalene 547.
In this embodiment, the Mooney viscosity ML of the solid ethylene propylene rubber 1+4,121℃ 55.ML (ML) 1+4,121℃ Refers to preheating for 1 minute at 121 ℃ and running for 4 minutes. The ethylene propylene rubber with low Mooney viscosity is selected, so that good processability can be obtained.
In this embodiment, the third monomer of the liquid ethylene propylene rubber is ethylidene norbornene, the third monomer content of the liquid ethylene propylene rubber is 7mol%, the ethylene monomer content is 50mol%, and the propylene monomer content is 50mol%.
In this example, the liquid ethylene propylene rubber had a Brookfield viscosity of 100000mPa.s to 1770000 Pa.s and a viscosity average molecular weight of 3000 to 80000. Preferably, the liquid ethylene propylene diene monomer is Trilene 77. Compared with a small molecular weight paraffin oil plasticizer in the raw material formula of the ethylene propylene rubber insulating material in the prior art, the plasticizer is not added in the raw material formula of the ethylene propylene rubber insulating material, but liquid ethylene propylene diene monomer with higher molecular weight is selected, so that the operation and the processing of the solid ethylene propylene diene monomer during mixing can be easier, and the mineral oil resistance and the heat resistance grade of the insulating material are improved; the mineral oil resistance test (GB/T2951.21-2008) is carried out on the ethylene propylene rubber insulating material prepared by adding the liquid ethylene propylene diene monomer, and the change rate of mechanical properties of the ethylene propylene rubber insulating material before and after the oil immersion test is small, so that the insulating material added with the high molecular weight liquid ethylene propylene diene monomer has oil resistance stability compared with the insulating material added with the low molecular weight paraffin oil. When the ethylene propylene rubber insulating material prepared by adding the liquid ethylene propylene diene monomer is subjected to a high-temperature hot air aging test (GB/T2951.12-2008), the change rate of mechanical properties of the ethylene propylene rubber insulating material before and after the test is smaller, which indicates that the insulating material added with the high-molecular-weight liquid ethylene propylene diene monomer has higher heat resistance grade than the insulating material added with the low-molecular-weight paraffin oil; compared with small molecular weight paraffin oil, the high molecular weight liquid ethylene propylene diene monomer rubber forms an interpenetrating network structure with the solid ethylene propylene diene monomer rubber during blending to obtain an insulating material, and the insulating material is not easy to extract and migrate under the conditions of mineral oil and higher temperature and is more resistant to oxidation of thermo-oxidative free radicals.
In this example, the vulcanization system is a dialkyl peroxide vulcanizing agent and an allyl ester vulcanization auxiliary crosslinking agent, and the mass ratio is 3.2%:1.0%.
In this example, the dialkyl peroxide vulcanizing agent is di-t-butyl peroxide and 2, 2-bis (t-butylperoxy) butane (mass ratio 1:1); the dialkyl peroxide vulcanizing agent with the half-life decomposition temperature of more than 190 ℃ in 1min is more favorable for ethylene propylene rubber granulation;
the allyl ester vulcanization aid cross-linking agent is diallyl fumarate. The allyl ester vulcanization auxiliary cross-linking agent with the boiling point higher than 120 ℃ is selected, so that the extrusion granulation of the ethylene propylene rubber is facilitated, the problem of scorching of rubber during processing is avoided, and meanwhile, the allyl ester vulcanization auxiliary cross-linking agent is subjected to self-crosslinking and loses activity.
It should be noted that the flame retardant system in this embodiment includes modified magnesium hydroxide. The surface of the modified magnesium hydroxide is subjected to activation treatment by a silane coupling agent, so that the contact interface compatibility of the flame retardant system and ethylene propylene rubber can be promoted, the compatible gap between the two materials is reduced, and the overall electrical property of the material is improved.
In this example, the maximum diameter of the particle size distribution of the flame retardant system was 10nm, and the effective chemical content was not less than 99.5mas%.
It should be noted that, in this embodiment, the protection system includes a chemical mechanism protection system and a physical mechanism protection system, and the mass ratio is 1.0%:4.0%.
It should be noted that, in this embodiment, the chemical action mechanism protection system includes a ketoamine antioxidant and a hindered phenol antioxidant (mass ratio 1:1); the physical mechanism protection system comprises microcrystalline paraffin with a melting point of 80-100 ℃.
In this example, the ketoamine antioxidant was an antioxidant AW and an antioxidant BLE (mass ratio 3:1).
The chemical action mechanism type protection system mainly plays a remarkable role in protecting the heat resistance, ozone resistance and fatigue resistance of the ethylene propylene diene monomer rubber insulating material, and prolongs the service life of the ethylene propylene diene monomer rubber insulating material and the service life of a cable.
The physical action mechanism type protection system is separated out to the surface of the ethylene propylene diene monomer rubber insulating material to cover the surface of the rubber through physical action, so that the ageing resistance of the rubber is improved, and meanwhile, the ethylene propylene diene monomer rubber insulating material is softened, so that extrusion granulation is facilitated.
Preferably, the synergistic system comprises one or more of anhydrous zinc borate, anhydrous lead borate and anhydrous organic silicone.
It should be noted that, the synergistic system in this embodiment includes anhydrous zinc borate, anhydrous lead borate and anhydrous silicone, and the mass ratio is 15%:0.008%:8%.
The synergistic system material is also a micromolecular material which is not easy to volatilize, has the effect of inhibiting the smoke density from being larger during smokeless combustion, can promote the insulating material and smoke dust to solidify into carbon crust, has the heat insulation effect, and almost has no acid gas release at the same time because the synergistic system contains no water.
The embodiment provides an oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulation material system for a rail transit cable, which comprises an internal mixer, a rubber filter, a single-screw reciprocating rubber extruder, an air cooling pipeline and a packaging discharging machine which are connected in sequence.
The embodiment also provides a preparation method of the oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for the rail transit cable, which comprises the following steps:
(1) Mixing by an internal mixer: putting the weighed and proportioned raw materials into an internal mixer for mixing uniformly to obtain a mixed rubber, wherein the mixing temperature is 125 ℃;
(2) Filtering by a rubber filter: putting the rubber compound into a rubber filter for extrusion and filtration;
the filtering adopts three layers of filter screens, and the mesh numbers of the three layers of filter screens which sequentially pass through are 180 meshes/120 meshes/60 meshes respectively;
(3) Granulating by an extruder: adding the filtered rubber compound into a single-screw reciprocating rubber extruder for vulcanization and pelleting to obtain rubber particles, wherein the temperature is controlled at 125 ℃;
(4) And (5) heat drying and packaging: and the rubber particles enter a sealed air cooling pipeline, are dried by purified hot air, and enter a packaging discharging machine for vacuum packaging after being cooled.
The embodiment provides the ethylene propylene rubber insulating material for the rail transit cable and the preparation method thereof, wherein the insulating material has low smoke density and good oil resistance, the stable and reliable performance and the processing performance of the ethylene propylene rubber insulating material are improved, the requirements of GB/T28429-2012 direct current traction power cables and accessories of 1500V and below for rail transit are met, the long-term working temperature reaches 125 ℃, and the ethylene propylene rubber insulating material has excellent comprehensive performance, is flame-retardant, halogen-free and low in smoke.
Example 3
The embodiment provides an oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for a rail transit cable, which comprises the following raw materials in formula:
wherein the ethylene propylene rubber comprises solid ethylene propylene rubber and liquid ethylene propylene rubber.
The synergistic system is a system with the function of inhibiting the smoke density from being larger during smokeless combustion.
In this embodiment, the third monomer of the solid ethylene propylene rubber is ethylidene norbornene, the content of the third monomer of the solid ethylene propylene rubber is 10mol%, the content of ethylene monomer is 62mol%, and the content of propylene monomer is 29mol%. In this example, the solid ethylene propylene diene monomer rubber was Buna G3963.
In this embodiment, the Mooney viscosity ML of the solid ethylene propylene rubber 1+4,121℃ 38.
In this embodiment, the third monomer of the liquid ethylene propylene rubber is ethylidene norbornene, the third monomer content of the liquid ethylene propylene rubber is 10mol%, the ethylene monomer content is 60mol%, and the propylene monomer content is 25mol%.
In this example, the liquid ethylene propylene rubber had a Brookfield viscosity of 100000mPa.s to 1770000 Pa.s and a viscosity average molecular weight of 3000 to 80000. In this example, the ethylene propylene diene monomer rubber of the liquid was Trilene 77.
In this example, the vulcanization system is a dialkyl peroxide vulcanizing agent and an allyl ester vulcanization auxiliary crosslinking agent, and the mass ratio is 4.0%:1.5%.
In this embodiment, the dialkyl peroxide vulcanizing agent is di-tert-butyl peroxide; the dialkyl peroxide vulcanizing agent with the half-life decomposition temperature of more than 190 ℃ in 1min is more favorable for ethylene propylene rubber granulation;
the allyl ester vulcanization aid cross-linking agent is tetraallyloxyethane. The allyl ester vulcanization auxiliary cross-linking agent with the boiling point higher than 120 ℃ is selected, so that the extrusion granulation of the ethylene propylene rubber is facilitated, the problem of scorching of rubber during processing is avoided, and meanwhile, the allyl ester vulcanization auxiliary cross-linking agent is subjected to self-crosslinking and loses activity.
In this embodiment, the flame retardant system includes modified magnesium hydroxide and modified aluminum hydroxide, and the mass ratio is 2:1. The surface of the modified magnesium hydroxide, the modified aluminum hydroxide and the modified hydrated aluminum magnesium carbonate is subjected to activation treatment by a silane coupling agent, so that the contact interface compatibility of the flame-retardant system and the ethylene propylene rubber can be promoted, the compatible gap between the two materials is reduced, and the overall electrical property of the material is improved.
In this example, the maximum diameter of the particle size distribution of the flame retardant system was 10nm, and the effective chemical content was not less than 99.5mas%.
It should be noted that, in this embodiment, the protection system includes a chemical mechanism protection system and a physical mechanism protection system, and the mass ratio is 1.8%:3.0%.
It should be noted that, in this embodiment, the chemical mechanism protection system includes a hindered phenol antioxidant; the physical mechanism protection system comprises microcrystalline paraffin with a melting point of 80-100 ℃.
The chemical action mechanism type protection system mainly plays a remarkable role in protecting the heat resistance, ozone resistance and fatigue resistance of the ethylene propylene diene monomer rubber insulating material, and prolongs the service life of the ethylene propylene diene monomer rubber insulating material and the service life of a cable.
The physical action mechanism type protection system is separated out to the surface of the ethylene propylene diene monomer rubber insulating material to cover the surface of the rubber through physical action, so that the ageing resistance of the rubber is improved, and meanwhile, the ethylene propylene diene monomer rubber insulating material is softened, so that extrusion granulation is facilitated.
Preferably, the synergistic system comprises one or more of anhydrous zinc borate, anhydrous lead borate and anhydrous organic silicone.
It should be noted that the synergistic system in this embodiment includes anhydrous zinc borate.
The synergistic system material is also a micromolecular material which is not easy to volatilize, has the effect of inhibiting the smoke density from being larger during smokeless combustion, can promote the insulating material and smoke dust to solidify into carbon crust, has the heat insulation effect, and almost has no acid gas release at the same time because the synergistic system contains no water.
The embodiment provides an oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulation material system for a rail transit cable, which comprises an internal mixer, a rubber filter, a single-screw reciprocating rubber extruder, an air cooling pipeline and a packaging discharging machine which are connected in sequence.
The embodiment also provides a preparation method of the oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for the rail transit cable, which comprises the following steps:
(1) Mixing by an internal mixer: putting the weighed and proportioned raw materials into an internal mixer for mixing uniformly to obtain a mixed rubber, wherein the mixing temperature is 125 ℃;
(2) Filtering by a rubber filter: putting the rubber compound into a rubber filter for extrusion and filtration;
the filtering adopts three layers of filter screens, and the mesh numbers of the three layers of filter screens which sequentially pass through are 180 meshes/120 meshes/60 meshes respectively;
(3) Granulating by an extruder: adding the filtered rubber compound into a single-screw reciprocating rubber extruder for vulcanization and pelleting to obtain rubber particles, wherein the temperature is controlled at 125 ℃;
(4) And (5) heat drying and packaging: and the rubber particles enter a sealed air cooling pipeline, are dried by purified hot air, and enter a packaging discharging machine for vacuum packaging after being cooled.
Example 4
The embodiment provides an oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for a rail transit cable, which comprises the following raw materials in formula:
wherein the ethylene propylene rubber comprises solid ethylene propylene rubber and liquid ethylene propylene rubber.
The synergistic system is a system with the function of inhibiting the smoke density from being larger during smokeless combustion.
In this embodiment, the third monomer of the solid ethylene propylene rubber is ethylidene norbornene, the content of the third monomer of the solid ethylene propylene rubber is 12mol%, the content of ethylene monomer is 58mol%, and the content of propylene monomer is 30mol%. After the ethylene propylene diene monomer with higher content of solid Ethylidene Norbornene (ENB) is vulcanized by a vulcanization system, a mineral oil resistance test (GB/T2951.21-2008) is carried out, and the result shows that the change rate of mechanical properties before and after oil immersion is very low, which indicates that the ethylene propylene monomer with higher vulcanization degree can be obtained after the vulcanization of the solid Ethylidene Norbornene (ENB); the ethylene propylene diene monomer having a high ethylene content and little or no residual metal catalyst gives better electrical insulation properties, and it should be noted that the solid ethylene propylene diene monomer in this example is Royalene547 and Buna G3963 (mass ratio of 1:1).
In this embodiment, the Mooney viscosity ML of the solid ethylene propylene rubber 1+4,121℃ 45.
In this embodiment, the third monomer of the liquid ethylene propylene rubber is ethylidene norbornene, the third monomer content of the liquid ethylene propylene rubber is 12mol%, the ethylene monomer content is 65mol%, and the propylene monomer content is 35mol%.
In this example, the liquid ethylene propylene rubber had a Brookfield viscosity of 100000mPa.s to 1770000 Pa.s and a viscosity average molecular weight of 3000 to 80000. Preferably, the liquid ethylene propylene diene monomer is Trilene 77.
In this embodiment, the ethylene propylene rubber is ethylene propylene diene monomer, wherein the third monomer content is 7.0mol%, and a higher vulcanization degree can be obtained. The ethylene monomer content is 72mol percent, so that the insulating material can obtain better electrical performance. The third monomer is 1, 4-Hexadiene (HD).
Ethylene Propylene Diene Monomer (EPDM) rubber contains little or no metal catalyst, in this exampleEPDM4725P。
In the present embodiment, the Mooney viscosity ML of the ethylene propylene rubber 1+4,121℃ 50.ML (ML) 1+4,121℃ Refers to preheating for 1 minute at 121 ℃ and running for 4 minutes. The ethylene propylene rubber with low Mooney viscosity is selected, so that good processability can be obtained.
In this example, the vulcanization system was a dialkyl peroxide-based vulcanizing agent.
In this embodiment, the dialkyl peroxide vulcanizing agent is di-t-amyl peroxide; the dialkyl peroxide vulcanizing agent with the half-life decomposition temperature of more than 190 ℃ in 1min is more favorable for ethylene propylene rubber granulation;
in this embodiment, the flame retardant system includes modified aluminum hydroxide and modified hydrated aluminum magnesium carbonate in a mass ratio of 1:2. The surface of the modified magnesium hydroxide, the modified aluminum hydroxide and the modified hydrated aluminum magnesium carbonate is subjected to activation treatment by a silane coupling agent, so that the contact interface compatibility of the flame-retardant system and the ethylene propylene rubber can be promoted, the compatible gap between the two materials is reduced, and the overall electrical property of the material is improved.
In this example, the maximum diameter of the particle size distribution of the flame retardant system was 10nm, and the effective chemical content was not less than 99.5mas%.
It should be noted that, in this embodiment, the protection system includes a chemical mechanism protection system and a physical mechanism protection system, and the mass ratio is 1.3%:3.0%.
It should be noted that, in this embodiment, the chemical mechanism protection system includes a hindered phenol antioxidant; the physical mechanism protection system comprises low molecular weight 8000-12000 petroleum jelly and microcrystalline paraffin with melting point 80-100deg.C (mass ratio 1:1).
The chemical action mechanism type protection system mainly plays a remarkable role in protecting the heat resistance, ozone resistance and fatigue resistance of the ethylene propylene diene monomer rubber insulating material, and prolongs the service life of the ethylene propylene diene monomer rubber insulating material and the service life of a cable.
The physical action mechanism type protection system is separated out to the surface of the ethylene propylene diene monomer rubber insulating material to cover the surface of the rubber through physical action, so that the ageing resistance of the rubber is improved, and meanwhile, the ethylene propylene diene monomer rubber insulating material is softened, so that extrusion granulation is facilitated.
Preferably, the synergistic system comprises one or more of anhydrous zinc borate, anhydrous lead borate and anhydrous organic silicone.
It should be noted that, the synergistic system in this embodiment includes anhydrous zinc borate, anhydrous lead borate and anhydrous silicone, and the mass ratio is 20%:0.01%:15%.
The synergistic system material is also a micromolecular material which is not easy to volatilize, has the effect of inhibiting the smoke density from being larger during smokeless combustion, can promote the insulating material and smoke dust to solidify into carbon crust, has the heat insulation effect, and almost has no acid gas release at the same time because the synergistic system contains no water.
The embodiment provides an oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulation material system for a rail transit cable, which comprises an internal mixer, a rubber filter, a single-screw reciprocating rubber extruder, an air cooling pipeline and a packaging discharging machine which are connected in sequence.
The embodiment also provides a preparation method of the oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for the rail transit cable, which comprises the following steps:
(1) Mixing by an internal mixer: putting the weighed and proportioned raw materials into an internal mixer for mixing uniformly to obtain a mixed rubber, wherein the mixing temperature is 125 ℃;
(2) Filtering by a rubber filter: putting the rubber compound into a rubber filter for extrusion and filtration;
the filtering adopts three layers of filter screens, and the mesh numbers of the three layers of filter screens which sequentially pass through are 180 meshes/120 meshes/60 meshes respectively;
(3) Granulating by an extruder: adding the filtered rubber compound into a single-screw reciprocating rubber extruder for vulcanization and pelleting to obtain rubber particles, wherein the temperature is controlled at 125 ℃;
(4) And (5) heat drying and packaging: and the rubber particles enter a sealed air cooling pipeline, are dried by purified hot air, and enter a packaging discharging machine for vacuum packaging after being cooled.
Example 5
The embodiment provides an oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for a rail transit cable, which comprises the following raw materials in formula:
wherein the ethylene propylene rubber comprises solid ethylene propylene rubber and liquid ethylene propylene rubber.
The synergistic system is a system with the function of inhibiting the smoke density from being larger during smokeless combustion.
In this embodiment, the third monomer of the solid ethylene propylene rubber is ethylidene norbornene, the content of the third monomer of the solid ethylene propylene rubber is 11mol%, the content of ethylene monomer is 55mol%, and the content of propylene monomer is 31mol%. After the ethylene propylene diene monomer with higher content of solid Ethylidene Norbornene (ENB) is vulcanized by a vulcanization system, a mineral oil resistance test (GB/T2951.21-2008) is carried out, and the result shows that the change rate of mechanical properties before and after oil immersion is very low, which indicates that the ethylene propylene monomer with higher vulcanization degree can be obtained after the vulcanization of the solid Ethylidene Norbornene (ENB); the ethylene propylene diene monomer having a high ethylene content and little or no residual metal catalyst can obtain better electrical insulation properties, and it should be noted that the solid ethylene propylene diene monomer in this embodiment is Buna G3963.
In this embodiment, the Mooney viscosity ML of the solid ethylene propylene rubber 1+4,121℃ 50.
In this embodiment, the third monomer of the liquid ethylene propylene rubber is ethylidene norbornene, the third monomer content of the liquid ethylene propylene rubber is 9mol%, the ethylene monomer content is 75mol%, and the propylene monomer content is 30mol%.
Preferably, the liquid ethylene propylene rubber has a Brookfield viscosity of 100000mPa.s to 1770000 Pa.s and a viscosity average molecular weight of 3000 to 80000. Preferably, the liquid ethylene propylene diene monomer is Trilene 77.
In this example, the vulcanization system is a dialkyl peroxide vulcanizing agent and an allyl ester vulcanization auxiliary crosslinking agent, and the mass ratio is 2.5%:2%.
In this embodiment, the dialkyl peroxide vulcanizing agent is di-t-amyl peroxide; the dialkyl peroxide vulcanizing agent with the half-life decomposition temperature of more than 190 ℃ in 1min is more favorable for ethylene propylene rubber granulation;
the allyl ester vulcanization aid cross-linking agent is diallyl fumarate and tetraallyloxyethane (the mass ratio is 2 percent to 1 percent). The allyl ester vulcanization auxiliary cross-linking agent with the boiling point higher than 120 ℃ is selected, so that the extrusion granulation of the ethylene propylene rubber is facilitated, the problem of scorching of rubber during processing is avoided, and meanwhile, the allyl ester vulcanization auxiliary cross-linking agent is subjected to self-crosslinking and loses activity.
It should be noted that, in this embodiment, the flame retardant system includes modified magnesium hydroxide, modified aluminum hydroxide and modified hydrated aluminum magnesium carbonate, and the mass ratio is 1:1:1. The surface of the modified magnesium hydroxide, the modified aluminum hydroxide and the modified hydrated aluminum magnesium carbonate is subjected to activation treatment by a silane coupling agent, so that the contact interface compatibility of the flame-retardant system and the ethylene propylene rubber can be promoted, the compatible gap between the two materials is reduced, and the overall electrical property of the material is improved.
In this example, the maximum diameter of the particle size distribution of the flame retardant system was 10nm, and the effective chemical content was not less than 99.5mas%.
It should be noted that, in this embodiment, the protection system includes a chemical mechanism protection system and a physical mechanism protection system, and the mass ratio is 2.5%:2%.
It should be noted that, in this embodiment, the chemical mechanism protection system includes a ketoamine antioxidant; the physical action mechanism type protection system comprises petroleum jelly with a low molecular weight of 8000-12000.
In this example, the ketoamine antioxidant is an antioxidant AW.
The chemical action mechanism type protection system mainly plays a remarkable role in protecting the heat resistance, ozone resistance and fatigue resistance of the ethylene propylene diene monomer rubber insulating material, and prolongs the service life of the ethylene propylene diene monomer rubber insulating material and the service life of a cable.
The physical action mechanism type protection system is separated out to the surface of the ethylene propylene diene monomer rubber insulating material to cover the surface of the rubber through physical action, so that the ageing resistance of the rubber is improved, and meanwhile, the ethylene propylene diene monomer rubber insulating material is softened, so that extrusion granulation is facilitated.
Preferably, the synergistic system comprises one or more of anhydrous zinc borate, anhydrous lead borate and anhydrous organosilicone.
It should be noted that, the synergistic system in this embodiment includes anhydrous zinc borate, anhydrous lead borate and anhydrous silicone, and the mass ratio is 25%:0.005%:12%.
As shown in figure 1, the synergistic system material is also a small molecular material which is not easy to volatilize, has the effect of inhibiting the smoke density from being larger during smokeless combustion, can promote the insulating material and smoke dust to solidify into carbon crust, has the heat insulation effect, and almost does not release acid gas at the same time because the synergistic system contains no water, and can be seen from figure 2, the insulating material and the smoke dust are solidified into carbon crust.
As shown in fig. 2, the embodiment provides an oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulation material system for a rail transit cable, which comprises an internal mixer 1, a rubber filter 2, a single-screw reciprocating rubber extruder 3, an air cooling pipeline 4 and a packaging discharging machine 5 which are connected in sequence.
The embodiment also provides a preparation method of the oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for the rail transit cable, which comprises the following steps:
(1) Mixing by an internal mixer 1: putting the weighed and proportioned raw materials into an internal mixer 1 for mixing uniformly to obtain a mixed rubber, wherein the mixing temperature is 125 ℃;
(2) Filtering by a rubber filter 2: putting the rubber compound into a rubber filter 2 for extrusion and filtration;
the filtering adopts three layers of filter screens, and the mesh numbers of the three layers of filter screens which sequentially pass through are 180 meshes/120 meshes/60 meshes respectively;
(3) Granulating by an extruder: putting the filtered rubber compound into a single-screw reciprocating rubber extruder 3 for vulcanization and pelleting to obtain rubber particles, wherein the temperature is controlled at 125 ℃;
(4) And (5) heat drying and packaging: the rubber particles enter a sealed air cooling pipeline 4 again, are dried by purified hot air, and enter a packaging discharging machine 5 for vacuum packaging after being cooled.
According to the materials prepared according to the corresponding content of the raw material formula in the embodiment, the halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for the rail transit cable is produced by the method, and is used for the rail transit cable product after being placed for 6-12 hours, and the sampling test results on the finished product of the produced cable product are shown in the following table 1.
TABLE 1
The embodiment provides the ethylene propylene rubber insulating material for the rail transit cable and the preparation method thereof, wherein the insulating material has low smoke density and good oil resistance, the stable and reliable performance and the processing performance of the ethylene propylene rubber insulating material are improved, the requirements of GB/T28429-2012 of a direct current traction power cable and accessories for rail transit 1500V and below are met, the long-term working temperature reaches 125 ℃, the comprehensive performance is excellent, the flame retardance, no halogen and low smoke are realized, the reliability is high, the service life is long, and the national standard is higher.
Example 6
The embodiment provides an ethylene propylene rubber insulating material for a rail transit cable, which comprises the following components in percentage by weight:
| ethylene propylene rubber insulating material name | A | B | C |
| Royalene 547 | 100 | 100 | 100 |
| Trilene 77 | 5 | 7 | 10 |
| Di-tert-amyl peroxide | 3 | 3 | 3 |
| Diallyl fumarate | 1.2 | 1.2 | 1.2 |
| Modified hydrated aluminium magnesium carbonate | 30 | 30 | 30 |
| Modified magnesium hydroxide | 80 | 80 | 80 |
| Modified aluminum hydroxide | 60 | 60 | 60 |
| Microcrystalline paraffin wax | 1.6 | 1.6 | 1.6 |
| Anti-aging agent AW | 0.8 | 0.8 | 0.8 |
| Anhydrous zinc borate | 10 | 10 | 10 |
| Organosilicone | 8 | 8 | 8 |
| Totalizing | 297.6 | 301.6 | 304.6 |
TABLE 2
Example 6 typical values for the test results of the formulation and for the test results of commercially available types of compounds are shown in Table 3:
TABLE 3 Table 3
From the test results of table 3 in example 6, it is clear that: the solid ethylidene norbornene type ethylene propylene diene monomer rubber Royalene 547 contains higher content of ethylidene norbornene, and after the Royalene 547 rubber is vulcanized by a vulcanization system, a mineral oil resistance test is carried out, and the result shows that the change rate of the mechanical properties of the solid ethylidene norbornene type ethylene propylene diene monomer rubber is very low before and after oil immersion, which indicates that higher vulcanization degree can be obtained after the ethylene propylene rubber of Ethylidene Norbornene (ENB) is vulcanized; ethylene propylene diene monomer having a high ethylene content and little or no residual metal catalyst gives better electrical insulation properties.
The liquid ethylene propylene rubber is liquid ethylene propylene diene monomer (Trilene 77), and compared with a paraffin oil plasticizer with small molecular weight, the liquid ethylene propylene diene monomer with higher molecular weight is selected, so that the solid ethylene propylene diene monomer can be processed more easily during mixing, and the mineral oil resistance and the heat resistance level of the material are improved; the mineral oil resistance test is carried out by adding the liquid ethylene propylene diene monomer rubber insulating material, and the mechanical property change rate of the insulating material before and after the oil immersion test is small, so that the insulating material added with the high molecular weight liquid ethylene propylene diene monomer rubber has oil resistance stability compared with the insulating material added with the low molecular weight paraffin oil; when the liquid ethylene propylene diene monomer rubber-added insulating material is subjected to a high-temperature hot air aging test, the change rate of mechanical properties of the insulating material before and after the test is smaller, which indicates that the insulating material added with the high-molecular-weight liquid ethylene propylene diene monomer rubber has higher heat resistance grade than the insulating material added with the low-molecular-weight paraffin oil; compared with small molecular weight paraffin oil, the high molecular weight liquid ethylene propylene diene monomer rubber forms an interpenetrating network structure with the solid ethylene propylene diene monomer rubber during blending, is not easy to extract and migrate in mineral oil and under the condition of higher temperature, and is more resistant to oxidation of thermo-oxidative free radicals.
In the embodiment, the vulcanizing agent in the vulcanizing system is di-tert-amyl peroxide, the vulcanization aid cross-linking agent is diallyl fumarate, and the dialkyl peroxide vulcanizing agent with the half-life decomposition temperature of more than 190 ℃ in 1min is selected to be more beneficial to ethylene propylene rubber granulation; the diallyl fumarate vulcanization aid cross-linking agent with the boiling point of more than 120 ℃ is selected, so that the method is more beneficial to rubber production and processing, the problem of rubber scorch is avoided, and the problem that the diallyl fumarate vulcanization aid cross-linking agent is self-crosslinked and deactivated is avoided. The vulcanization system and ethylidene norbornene type ethylene propylene diene monomer undergo vulcanization reaction, and swelling test is carried out on vulcanized rubber, so that the result shows that the swelling rate is lower.
In this example, the flame retardant system includes modified magnesium hydroxide, modified aluminum hydroxide, and modified hydrated aluminum magnesium carbonate. Preferably, the flame retardant system has a particle size distribution maximum diameter of 10nm and an effective chemical content of not less than 99.5mas%. Preferably, the flame retardant system comprises 170 parts by weight. The surfaces of the modified magnesium hydroxide, the modified aluminum hydroxide and the modified hydrated aluminum magnesium carbonate are subjected to activation treatment by a silane coupling agent, so that the contact interface compatibility of a flame-retardant system and ethylene propylene rubber can be promoted, the compatible gap between the two materials is reduced, and the overall electrical property of the material is improved.
Preferably, the protection system comprises a chemical action mechanism protection system and a physical action mechanism protection system, and the mass ratio is (1% -2.5%): (2% -4%). It should be noted that, in this embodiment, the chemical action mechanism protection system includes a ketoamine antioxidant and/or a hindered phenol antioxidant; the physical mechanism protection system in this embodiment includes microcrystalline wax having a melting point of 80 to 100 ℃. Preferably, the ketoamine antioxidant is an antioxidant AW. The chemical action mechanism type protection system mainly plays a remarkable role in protecting the heat resistance, ozone resistance and fatigue resistance of the ethylene propylene diene monomer rubber insulating material, and prolongs the service life of the ethylene propylene diene monomer rubber insulating material. The physical action mechanism type protection system is separated out to the surface of the ethylene propylene diene monomer rubber insulating material to cover the surface of the rubber through physical action, so that the ageing resistance of the rubber is improved, and meanwhile, the ethylene propylene diene monomer rubber insulating material is softened, so that extrusion granulation is facilitated.
Preferably, the synergistic system comprises one or more of anhydrous zinc borate and/or lead borate and/or organosilicone. The weight portions of the components are respectively (15% -25%): (0.005% -0.01%): (8% -15%). It should be noted that the synergistic system material in this embodiment is also a small molecular material which is not volatile, and has smoke suppression effect on smokeless combustion, and can promote the carbon forming, crusting and heat insulation effects of the material, and almost no acid gas is released.
The insulation resistance of the cable produced by the oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for the rail transit cable is higher than the national standard, and the cable is high in reliability and long in service life.
Example 7
The embodiment provides an ethylene propylene rubber insulating material for a rail transit cable, which comprises the following raw materials in formula:
| ethylene propylene rubber insulating material name | A | B | C |
| Buna G3963 | 100 | 100 | 100 |
| Trilene 77 | 3 | 7 | 10 |
| 2, 2-bis (t-butylperoxy) butane | 3 | 3 | 3 |
| Tetraallyloxyethane | 1.2 | 1.2 | 1.2 |
| Modified hydrated aluminium magnesium carbonate | 30 | 30 | 30 |
| Modified magnesium hydroxide | 80 | 80 | 80 |
| Modified aluminum hydroxide | 60 | 60 | 60 |
| Microcrystalline paraffin wax | 1.6 | 1.6 | 1.6 |
| Anti-aging agent DD | 0.8 | 0.8 | 0.8 |
| Anhydrous zinc borate | 10 | 10 | 10 |
| Organosilicone | 8 | 8 | 8 |
| Totalizing | 297.6 | 301.6 | 304.6 |
TABLE 4 Table 4
Example 7 typical values for the test results of the formulation and the test results of the commercially available same type of compounds are shown in Table 5:
TABLE 5
From the test results of table 5 in example 7, it is clear that: solid ethylidene norbornene type ethylene propylene diene monomer Buna G3963 contains higher content of ethylidene norbornene, and after the Buna G3963 rubber is vulcanized by a vulcanization system, a mineral oil resistance test is carried out, and the result shows that the change rate of mechanical properties before and after oil immersion is very low, which indicates that higher vulcanization degree can be obtained after the Ethylidene Norbornene (ENB) ethylene propylene rubber is vulcanized; ethylene propylene diene monomer having a high ethylene content and little or no residual metal catalyst gives better electrical insulation properties.
The liquid ethylene propylene rubber is liquid ethylene propylene diene monomer (Trilene 77), and compared with a paraffin oil plasticizer with small molecular weight, the liquid ethylene propylene diene monomer with higher molecular weight is selected, so that the solid ethylene propylene diene monomer can be processed more easily during mixing, and the mineral oil resistance and the heat resistance level of the material are improved; the mineral oil resistance test is carried out by adding the liquid ethylene propylene diene monomer rubber insulating material, and the mechanical property change rate of the insulating material before and after the oil immersion test is small, so that the insulating material added with the high molecular weight liquid ethylene propylene diene monomer rubber has oil resistance stability compared with the insulating material added with the low molecular weight paraffin oil; when the liquid ethylene propylene diene monomer rubber-added insulating material is subjected to a high-temperature hot air aging test, the change rate of mechanical properties of the insulating material before and after the test is smaller, which indicates that the insulating material added with the high-molecular-weight liquid ethylene propylene diene monomer rubber has higher heat resistance grade than the insulating material added with the low-molecular-weight paraffin oil; compared with small molecular weight paraffin oil, the high molecular weight liquid ethylene propylene diene monomer rubber forms an interpenetrating network structure with the solid ethylene propylene diene monomer rubber during blending, is not easy to extract and migrate in mineral oil and under the condition of higher temperature, and is more resistant to oxidation of thermo-oxidative free radicals.
In the embodiment, the vulcanizing agent in the vulcanizing system is 2, 2-bis (tert-butylperoxy) butane, the vulcanization auxiliary crosslinking agent is tetraallyloxyethane, and the dialkyl peroxide vulcanizing agent with the half-life decomposition temperature of 1min being more than 190 ℃ is selected to be more beneficial to ethylene propylene rubber granulation; the allyl ester vulcanization auxiliary cross-linking agent with the boiling point higher than 120 ℃ is selected, so that the production and processing of rubber are facilitated, the problem of scorching of rubber is avoided, and meanwhile, the self-crosslinking deactivation of the allyl ester vulcanization auxiliary cross-linking agent is avoided. The vulcanization system and ethylidene norbornene type ethylene propylene diene monomer undergo vulcanization reaction, and swelling test is carried out on vulcanized rubber, so that the result shows that the swelling rate is lower.
In this example, the flame retardant system includes modified magnesium hydroxide, modified aluminum hydroxide, and modified hydrated aluminum magnesium carbonate. The maximum diameter of the particle size distribution of the flame-retardant system is 10nm, and the effective chemical components are not less than 99.5mas percent. The flame retardant system comprises 170 parts by weight. The surfaces of the modified magnesium hydroxide, the modified aluminum hydroxide and the modified hydrated aluminum magnesium carbonate are subjected to activation treatment by a silane coupling agent, so that the contact interface compatibility of a flame-retardant system and ethylene propylene rubber can be promoted, the compatible gap between the two materials is reduced, and the overall electrical property of the material is improved.
Preferably, the protection system comprises a chemical action mechanism protection system and a physical action mechanism protection system, and the mass ratio is (1% -2.5%): (2% -4%). It should be noted that, in this embodiment, the chemical action mechanism protection system includes a ketoamine antioxidant and/or a hindered phenol antioxidant; the physical mechanism protection system comprises microcrystalline paraffin with a melting point of 80-100 ℃. In this example, the ketoamine antioxidant is an antioxidant DD. The chemical action mechanism type protection system mainly plays a remarkable role in protecting the heat resistance, ozone resistance and fatigue resistance of the ethylene propylene diene monomer rubber insulating material, and prolongs the service life of the ethylene propylene diene monomer rubber insulating material. The physical action mechanism type protection system is separated out to the surface of the ethylene propylene diene monomer rubber insulating material to cover the surface of the rubber through physical action, so that the ageing resistance of the rubber is improved, and meanwhile, the ethylene propylene diene monomer rubber insulating material is softened, so that extrusion granulation is facilitated.
Preferably, the synergistic system comprises one or more of anhydrous zinc borate and/or lead borate and/or organosilicone. The weight portions of the components are respectively (15% -25%): (0.005% -0.01%): (8% -15%). It should be noted that the synergistic system material in this embodiment is also a small molecular material which is not volatile, and has smoke suppression effect on smokeless combustion, and can promote the carbon forming, crusting and heat insulation effects of the material, and almost no acid gas is released.
The insulation resistance of the cable produced by the oil-resistant halogen-free low-smoke flame-retardant ethylene propylene rubber insulating material for the rail transit cable is higher than the national standard, and the cable is high in reliability and long in service life.
It is to be understood that the above embodiments are merely illustrative of the application of the principles of the present invention, but not in limitation thereof. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the invention, and are also considered to be within the scope of the invention.
Claims (6)
1. The ethylene propylene rubber insulating material for the rail transit cable is characterized by comprising the following raw materials in percentage by weight:
ethylene propylene rubber: 100 parts by mass;
vulcanization system: 0.5 to 4 parts by mass;
flame retardant system: 130-170 parts by mass;
protection system: 0.5 to 4 parts by mass;
and (3) a synergistic system: 13-30 parts by mass;
wherein the ethylene propylene rubber comprises solid ethylene propylene rubber and liquid ethylene propylene rubber, the liquid ethylene propylene rubber is Trilene 77, and the solid ethylene propylene rubber is Royalene 547 or Buna G3963;
the protection system comprises a chemical action mechanism protection system and a physical action mechanism protection system, wherein the mass ratio is (1% -2.5%): (2% -4%);
The chemical action mechanism type protection system comprises a ketoamine antioxidant and/or a hindered phenol antioxidant; the physical action mechanism type protection system comprises microcrystalline paraffin with a melting point of 80-100 ℃ and/or petroleum jelly with a molecular weight of 5000-12000;
the ketoamine antioxidant is one or more of an antioxidant AW, an antioxidant BLE and an antioxidant DD;
the synergistic system comprises one or more of anhydrous zinc borate, anhydrous lead borate and anhydrous organic silicone;
the vulcanization system includes a dialkyl peroxide-based vulcanizing agent and a vulcanization co-crosslinking agent including diallyl fumarate and/or tetraallyloxyethane.
2. The ethylene propylene rubber insulation material for the rail transit cable according to claim 1, wherein the vulcanization system comprises a dialkyl peroxide vulcanizing agent and a vulcanization auxiliary crosslinking agent, and the mass ratio is (2.5% -4%): (1% -2%).
3. The ethylene propylene rubber insulation material for rail transit cables according to claim 1, wherein the dialkyl peroxide vulcanizing agent comprises one or more of di-tert-amyl peroxide, di-tert-butyl peroxide and 2, 2-bis (tert-butylperoxy) butane.
4. The ethylene propylene rubber insulation material for rail transit cables according to claim 1, wherein the flame retardant system comprises one or more of modified magnesium hydroxide, modified aluminum hydroxide and modified hydrated aluminum magnesium carbonate.
5. The ethylene propylene rubber insulating material for the rail transit cable according to claim 1, wherein the synergistic system comprises anhydrous zinc borate, anhydrous lead borate and anhydrous organosilicone, and the mass ratio is (15% -25%): (0.005% -0.01%): (8% -15%).
6. A method for preparing the ethylene propylene rubber insulating material for the rail transit cable according to any one of claims 1 to 5, which is characterized by comprising the following steps:
(1) Mixing by an internal mixer: mixing the weighed and proportioned raw materials in an internal mixer to obtain a mixed rubber, wherein the mixing temperature is 125-135 ℃;
(2) Filtering by a rubber filter: putting the mixed rubber into a rubber filter for extrusion and filtration;
(3) Granulating by an extruder: adding the filtered rubber compound into a single-screw reciprocating rubber extruder for vulcanization and pelleting to obtain rubber particles, wherein the temperature in the rubber extruder is controlled at 120-135 ℃;
(4) And (5) heat drying and packaging: and the rubber particles enter a sealed air cooling pipeline, are dried by hot air, and are vacuum-packed after being cooled.
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| 何立中等.防老体系的选用.《橡胶加工基础》.化学工业出版社,1985, * |
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