CN113929608A - A kind of vulcanization accelerator and its preparation method and application - Google Patents
A kind of vulcanization accelerator and its preparation method and application Download PDFInfo
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- CN113929608A CN113929608A CN202111180646.9A CN202111180646A CN113929608A CN 113929608 A CN113929608 A CN 113929608A CN 202111180646 A CN202111180646 A CN 202111180646A CN 113929608 A CN113929608 A CN 113929608A
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- 238000004073 vulcanization Methods 0.000 title claims abstract description 97
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 229920001971 elastomer Polymers 0.000 claims abstract description 27
- 239000005060 rubber Substances 0.000 claims abstract description 27
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229920000459 Nitrile rubber Polymers 0.000 claims abstract description 25
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 claims abstract description 7
- 235000013922 glutamic acid Nutrition 0.000 claims abstract description 7
- 239000004220 glutamic acid Substances 0.000 claims abstract description 7
- JPJALAQPGMAKDF-UHFFFAOYSA-N selenium dioxide Chemical compound O=[Se]=O JPJALAQPGMAKDF-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000013040 rubber vulcanization Methods 0.000 claims abstract description 5
- WHUUTDBJXJRKMK-VKHMYHEASA-N L-glutamic acid Chemical compound OC(=O)[C@@H](N)CCC(O)=O WHUUTDBJXJRKMK-VKHMYHEASA-N 0.000 claims abstract description 4
- 239000007864 aqueous solution Substances 0.000 claims abstract description 3
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 30
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 23
- 229910052717 sulfur Inorganic materials 0.000 claims description 23
- 239000011593 sulfur Substances 0.000 claims description 23
- 239000000945 filler Substances 0.000 claims description 15
- 239000011787 zinc oxide Substances 0.000 claims description 15
- 239000002994 raw material Substances 0.000 claims description 9
- 235000021355 Stearic acid Nutrition 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 8
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 8
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 8
- 239000008117 stearic acid Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 2
- 125000003277 amino group Chemical group 0.000 claims 1
- 230000006835 compression Effects 0.000 abstract description 9
- 238000007906 compression Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 239000003795 chemical substances by application Substances 0.000 description 17
- 230000000052 comparative effect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 8
- 239000004014 plasticizer Substances 0.000 description 7
- 230000003712 anti-aging effect Effects 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 6
- 230000032683 aging Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- -1 dithiocarbamic acid zinc salt Chemical class 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- BUGBHKTXTAQXES-UHFFFAOYSA-N Selenium Chemical compound [Se] BUGBHKTXTAQXES-UHFFFAOYSA-N 0.000 description 2
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical class O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000000921 elemental analysis Methods 0.000 description 2
- 239000012065 filter cake Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910021389 graphene Inorganic materials 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical class C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000005077 polysulfide Substances 0.000 description 2
- 229920001021 polysulfide Polymers 0.000 description 2
- 150000008117 polysulfides Polymers 0.000 description 2
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 2
- 229910052711 selenium Inorganic materials 0.000 description 2
- 239000011669 selenium Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 238000010059 sulfur vulcanization Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000010060 peroxide vulcanization Methods 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
- 239000004636 vulcanized rubber Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C391/00—Compounds containing selenium
-
- 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
- C08K3/02—Elements
- C08K3/06—Sulfur
-
- 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
-
- 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
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/48—Selenium- or tellurium-containing compounds
-
- 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
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention discloses a vulcanization accelerator. The invention also discloses a preparation method of the vulcanization accelerator, which comprises the following steps: adding carbon disulfide into the mixed aqueous solution of selenium oxide and glutamic acid, and reacting to obtain the vulcanization accelerator. The invention also discloses application of the vulcanization accelerator in rubber vulcanization. The invention also discloses a rubber vulcanization system and the rapid vulcanization low-pressure-change nitrile rubber. The invention prepares the new vulcanization accelerator, and selects a proper vulcanization system, so that the rubber can be quickly vulcanized, the energy consumption is reduced, and the production cost is saved; and the nitrile rubber has good tensile strength, hardness and compression set property.
Description
Technical Field
The invention relates to the technical field of rubber, in particular to a vulcanization accelerator and a preparation method and application thereof.
Background
In the production of rubber products, vulcanization is required, and commonly used vulcanization systems include a sulfur vulcanization system, a peroxide vulcanization system and the like. For rubber materials, the influence of a vulcanization system on the performance of the rubber materials is large, different vulcanization systems can form different cross-linked structures, and different bond energies of the different cross-linked structures are the reasons for differences of macroscopic physical properties of vulcanized rubber, so that the rubber materials have different tensile strength, hardness and compression set.
Sulfur is a common vulcanizing agent, and when the sulfur is used alone, the vulcanizing time is long, the efficiency is low, and excessive vulcanization can generate a blooming phenomenon. The vulcanization accelerator can reduce the usage amount of sulfur, improve the vulcanization degree and further improve the mechanical properties of the rubber material.
Generally, the reaction between rubber and sulfur follows a first order reaction law, whereby the vulcanization reaction can be divided into three stages: scorching period, normal vulcanization period and over-vulcanization period. The first stage is as follows: a scorching period during which essentially no crosslinking reaction occurs between the rubber molecular chain and sulfur, mainly sulfur interacts with an activating agent and an accelerator to form a high-reactivity polysulfide precursor, and actually in the subsequent vulcanization process, it is this polysulfide that reacts with the rubber chain segment to cause crosslinking of the macromolecular chain; and a second stage: in the positive vulcanization period, the rubber can obtain the best mechanical property at the stage, sulfur begins to perform a crosslinking reaction during the positive vulcanization period to generate a large amount of monosulfide bonds and disulfide bonds, linear macromolecular chains of the rubber are gradually converted into a three-dimensional network structure, and macroscopically, the rubber hardness is increased, and the tensile strength and the rubber elasticity are increased; and a third stage: in the over-vulcanization period, after the normal vulcanization period, the crosslinking reaction of sulfur is basically finished, and as time goes on, the crosslinking bond is cracked, and simultaneously, the cracked chain segments are rearranged, so that the process is called reversion.
The existing sulfur vulcanization system is generally an accelerator and sulfur matching system, and has the problems of low vulcanization speed and low production efficiency. Such as: the common nitrile rubber has flat vulcanization curve, slower vulcanization speed and low production efficiency; generally, the mass fraction of acrylonitrile combined in the molecules of the ordinary nitrile rubber raw rubber is 20-40%, the normal vulcanization time at 150 ℃ is 17-24min, the vulcanization time is longer, and the energy consumption is higher. Therefore, it is required to increase the vulcanization rate, but it is difficult to maintain physical properties such as compression set of the rubber while increasing the vulcanization rate.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a vulcanization accelerator and a preparation method and application thereof, the invention prepares a new vulcanization accelerator, and selects a proper vulcanization system, so that rubber can be quickly vulcanized, the energy consumption is reduced, and the production cost is saved; and the nitrile rubber has good tensile strength, hardness and compression set property.
The invention provides a vulcanization accelerator, which has a structure shown in a formula (I).
The invention also provides a preparation method of the vulcanization accelerator, which comprises the following steps: adding carbon disulfide into the mixed aqueous solution of selenium oxide and glutamic acid, and reacting to obtain the vulcanization accelerator.
Preferably, the reaction temperature is 10-15 ℃.
Preferably, the reaction time is 2.5 to 3 h.
Preferably, the carbon disulphide addition rate is 2-3 ml/min.
Preferably, the molar ratio of the selenium oxide to the carbon disulfide to the glutamic acid is 1:2.1-2.2: 2.3-2.5.
The invention also provides the application of the vulcanization accelerator in rubber vulcanization.
Preferably, the rubber is nitrile rubber.
The invention also provides a rubber vulcanization system, which comprises the following raw materials: zinc oxide, sulfur and a vulcanization accelerator, wherein the weight ratio of the zinc oxide to the sulfur to the vulcanization accelerator is 4.5-5.5:0.3-0.35:4.2-4.6, and the vulcanization accelerator is the vulcanization accelerator.
Preferably, the weight ratio of zinc oxide, sulfur and vulcanization accelerator is 4:0.3: 4.4.
The invention also provides a fast-vulcanization low-pressure-change nitrile rubber which comprises the following raw materials in parts by weight: 100 parts of nitrile rubber, 50-85 parts of filler, 4.5-5.5 parts of zinc oxide, 0.8-1.2 parts of stearic acid, 4.2-4.6 parts of vulcanization accelerator and 0.3-0.35 part of sulfur, wherein the filler is filler with active hydroxyl or/and active amino on the surface, and the vulcanization accelerator is the vulcanization accelerator.
The filler may be at least one of silica, silicon carbide, hydroxylated carbon fiber, graphene oxide, modified montmorillonite, and the like.
The raw materials for the rapid-vulcanization low-pressure-change nitrile rubber can also comprise: plasticizers, flow aids, scorch retarders, aging retarders, etc.
The fast-vulcanization low-pressure-change nitrile rubber comprises the following raw materials in parts by weight: 100 parts of nitrile rubber, 85 parts of filler, 20 parts of plasticizer, 3 parts of flow additive, 5 parts of zinc oxide, 1 part of stearic acid, 0.3 part of anti-scorching agent, 6 parts of anti-aging agent, 4.4 parts of accelerator and 0.3 part of vulcanizing agent.
The preparation method of the fast-vulcanization low-pressure-change nitrile rubber comprises the following steps: plasticating the nitrile rubber on a double-roller open mill, then sequentially adding the filler, the plasticizer, the flow additive, the zinc oxide, the stearic acid, the anti-scorching agent, the anti-aging agent, the accelerator and the vulcanizing agent, uniformly mixing, then thinly passing through a sample, standing at room temperature for 24h, and vulcanizing at 150 ℃ and 160 ℃ to obtain the rapidly vulcanized low-pressure-change nitrile rubber.
The fast-vulcanized low-pressure-change nitrile rubber can be made into filters, sealing products and the like.
Has the advantages that:
1. the vulcanization accelerator, zinc oxide and a small amount of sulfur are matched, the vulcanization accelerator reacts with the zinc oxide to generate the monomeric sulfur, the monomeric selenium and the dithiocarbamic acid zinc salt accelerator, the monomeric sulfur and the monomeric selenium are matched with the original small amount of sulfur for vulcanization, the dithiocarbamic acid zinc salt accelerator can promote vulcanization, all the substances are matched with each other to realize effective vulcanization, the vulcanization speed can be accelerated, the vulcanization efficiency is improved, the unit consumption is reduced, and the crosslinking density can be improved, so that the tensile strength and the hardness of the rubber material are improved, and the compression permanent deformation rate is reduced;
2. the vulcanization accelerator provided by the invention contains carboxyl, can form hydrogen bonds with active hydroxyl or amino on the surface of the filler, is fixed on the surface of the filler, improves the dispersibility of the filler in rubber, enables the filler to bridge into a rubber matrix, further improves the hardness and tensile strength of the rubber material, reduces the compression set rate, and improves the subsequent trimming effect of the product.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A preparation method of a vulcanization accelerator comprises the following steps: dissolving 1.11g (0.01mol) of selenium oxide in 500ml of water, adding 3.38g (0.023mol) of glutamic acid, stirring until the solution is dissolved, adjusting the temperature to 10 ℃, then dropwise adding 1.26ml (0.021mol) of carbon disulfide at the speed of 2ml/min, keeping the temperature and stirring for 3 hours after the dropwise adding is finished, filtering, washing a filter cake with water, and drying in vacuum to obtain the vulcanization accelerator.
The vulcanization accelerator obtained in example 1 was subjected to elemental analysis and the results are shown in Table 1.
TABLE 1 results of elemental analysis
It can be seen from table 1 that the tested values and the theoretical values of the elements of the present invention are close.
Example 2
A preparation method of a vulcanization accelerator comprises the following steps: dissolving 1.11g (0.01mol) of selenium oxide in 500ml of water, adding 3.68g (0.025mol) of glutamic acid, stirring until the solution is dissolved, adjusting the temperature to 15 ℃, then dropwise adding 1.32ml (0.022mol) of carbon disulfide at the speed of 3ml/min, keeping the temperature and stirring for 2.5h after the dropwise adding is finished, filtering, washing a filter cake with water, and drying in vacuum to obtain the vulcanization accelerator.
Example 3
The fast-vulcanization low-pressure-change nitrile rubber comprises the following raw materials in parts by weight: 100g of acrylonitrile butadiene rubber with the mass fraction of 20-40%, 85g of gamma-aminopropyl triethoxysilane modified montmorillonite, 4.5g of zinc oxide, 0.8g of stearic acid, 4.2g of vulcanization accelerator, 0.32g of sulfur, TP-9520g of plasticizer, 3g of flow aid, 0.3g of anti-scorching agent CTP and 6g of anti-aging agent 4010 NA.
Example 4
The fast-vulcanization low-pressure-change nitrile rubber comprises the following raw materials in parts by weight: 100g of acrylonitrile butadiene rubber with the mass fraction of 20-40%, 60g of silicon dioxide, 5.5g of zinc oxide, 1.2g of stearic acid, 4.6g of vulcanization accelerator, 0.35g of sulfur, 0.3g of plasticizer TP-9520g of flow promoter, 0.3g of antiscorching agent CTP and 6g of anti-aging agent 4010 NA.
Example 5
The fast-vulcanization low-pressure-change nitrile rubber comprises the following raw materials in parts by weight: 100g of acrylonitrile butadiene rubber with the mass fraction of 20-40%, 50g of silicon dioxide, 5g of zinc oxide, 1g of stearic acid, 4.4g of vulcanization accelerator, 0.3g of sulfur, 0.3g of plasticizer TP-9520g of flow promoter, 0.3g of antiscorching agent CTP and anti-aging agent 4010NA6 g.
In the above examples 3 to 5, the vulcanization accelerators were all the vulcanization accelerators obtained in example 1; the filler (silica, modified montmorillonite) may be replaced with at least one of silicon carbide, hydroxylated carbon fiber, graphene oxide, and the like.
In examples 3 to 5 above, the rubber was prepared by the following method: plasticating nitrile rubber on a double-roll open mill, then sequentially adding filler, plasticizer, flow additive, zinc oxide, stearic acid, anti-scorching agent, anti-aging agent, accelerator and vulcanizing agent, uniformly mixing, then thinly passing through a sample, standing at room temperature for 24h, and then carrying out normal vulcanization at 150 ℃ to obtain the rapidly vulcanized low-pressure-change nitrile rubber.
Comparative example 1
The vulcanization accelerator was replaced by accelerator DM (i.e., 2' -dithiodibenzothiazole), otherwise as in example 5.
The vulcanization characteristics of examples 3 to 5 and comparative example 1 are shown in Table 2.
TABLE 2 vulcanization characteristics of examples 3-5, comparative example 1
| Grouping | MH(dN.m) | ML(dN.m) | T10(min) | T90(min) |
| Example 3 | 53.5 | 17.3 | 3.8 | 16.1 |
| Example 4 | 51.3 | 16.0 | 3.3 | 15.2 |
| Example 5 | 50.1 | 15.8 | 3.5 | 14.5 |
| Comparative example 1 | 42.5 | 15.6 | 5.5 | 24.0 |
As can be seen from Table 2, the positive vulcanization times for examples 3-5 are all less than 17 min; example 5 compared with comparative example 1, the vulcanization rate and the torque of example 5 were higher than those of comparative example 1. The invention improves the vulcanization efficiency, reduces the unit consumption and saves 5 ten thousand yuan per month for the production line.
The rubber materials obtained in examples 3 to 5 and comparative example 1 were subjected to property testing, and the results are shown in Table 3.
The mechanical property test is carried out by adopting a microcomputer control electronic universal tester. The tensile strength was tested according to GB/T528-2009.
Compression set tests were carried out in a hot air ageing oven in accordance with GB/T7759-2015.
And (4) carrying out an oil aging resistance test in a hot air aging box according to GB/T1690-.
TABLE 3 Performance test results
Remarking: the rubber material is 1#Standard oil, 3#The conditions in the standard oil are 125 ℃ for 70 h.
As can be seen from Table 3, the rubber materials obtained in examples 3 to 5 had good hardness, tensile strength, and low compression set; example 5 has higher hardness and tensile strength than comparative example 1, and example 5 has better compression set than comparative example 1.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. A vulcanization accelerator is characterized in that the structure of the vulcanization accelerator is shown as a formula (I).
2. A process for producing the vulcanization accelerator according to claim 1, characterized by comprising the steps of: adding carbon disulfide into the mixed aqueous solution of selenium oxide and glutamic acid, and reacting to obtain the vulcanization accelerator.
3. The process for producing a vulcanization accelerator according to claim 2, wherein the reaction temperature is 10 to 15 ℃.
4. The process for producing a vulcanization accelerator as claimed in claim 2 or 3, wherein the reaction time is 2.5 to 3 hours.
5. The process for producing a vulcanization accelerator according to any one of claims 2 to 4, wherein the carbon disulfide is added at a rate of 2 to 3 ml/min.
6. The process for producing a vulcanization accelerator according to any one of claims 2 to 5, wherein the molar ratio of selenium oxide, carbon disulfide and glutamic acid is 1:2.1 to 2.2:2.3 to 2.5.
7. Use of the vulcanization accelerator of claim 1 for vulcanization of rubber.
8. A rubber vulcanization system is characterized in that the raw materials comprise: zinc oxide, sulfur and a vulcanization accelerator, wherein the weight ratio of the zinc oxide to the sulfur to the vulcanization accelerator is 4.5-5.5:0.3-0.35:4.2-4.6, and the vulcanization accelerator is the vulcanization accelerator described in claim 1.
9. The fast-vulcanization low-pressure-change nitrile rubber is characterized by comprising the following raw materials in parts by weight: 100 parts of nitrile rubber, 50-85 parts of filler, 4.5-5.5 parts of zinc oxide, 0.8-1.2 parts of stearic acid, 4.2-4.6 parts of vulcanization accelerator and 0.3-0.35 part of sulfur, wherein the filler is a filler with active hydroxyl groups or/and active amino groups on the surface, and the vulcanization accelerator is the vulcanization accelerator as defined in claim 1.
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| CN118480325A (en) * | 2024-05-21 | 2024-08-13 | 广东中粘新材料科技有限公司 | A high-strength sealing material for vehicle and preparation method thereof |
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| CN118221961A (en) * | 2024-03-28 | 2024-06-21 | 南京工业大学 | A lignin xanthate zinc vulcanization accelerator and its preparation method and application |
| CN118480325A (en) * | 2024-05-21 | 2024-08-13 | 广东中粘新材料科技有限公司 | A high-strength sealing material for vehicle and preparation method thereof |
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