CN116903935B - Preparation process of low rolling resistance conveying rubber belt - Google Patents
Preparation process of low rolling resistance conveying rubber belt Download PDFInfo
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- CN116903935B CN116903935B CN202310919489.1A CN202310919489A CN116903935B CN 116903935 B CN116903935 B CN 116903935B CN 202310919489 A CN202310919489 A CN 202310919489A CN 116903935 B CN116903935 B CN 116903935B
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- rolling friction
- lower cover
- friction resistance
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- 238000005096 rolling process Methods 0.000 title claims abstract description 65
- 229920001971 elastomer Polymers 0.000 title claims abstract description 53
- 239000005060 rubber Substances 0.000 title claims abstract description 53
- 238000002360 preparation method Methods 0.000 title claims abstract description 23
- 229920002857 polybutadiene Polymers 0.000 claims abstract description 48
- 239000003607 modifier Substances 0.000 claims abstract description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000006229 carbon black Substances 0.000 claims abstract description 16
- 238000001556 precipitation Methods 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 150000001299 aldehydes Chemical group 0.000 claims description 27
- 238000002156 mixing Methods 0.000 claims description 18
- 239000005062 Polybutadiene Substances 0.000 claims description 12
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims description 12
- 230000003712 anti-aging effect Effects 0.000 claims description 12
- 239000003795 chemical substances by application Substances 0.000 claims description 12
- 238000007599 discharging Methods 0.000 claims description 11
- 238000004519 manufacturing process Methods 0.000 claims description 8
- KBXJHRABGYYAFC-UHFFFAOYSA-N octaphenylsilsesquioxane Chemical compound O1[Si](O2)(C=3C=CC=CC=3)O[Si](O3)(C=4C=CC=CC=4)O[Si](O4)(C=5C=CC=CC=5)O[Si]1(C=1C=CC=CC=1)O[Si](O1)(C=5C=CC=CC=5)O[Si]2(C=2C=CC=CC=2)O[Si]3(C=2C=CC=CC=2)O[Si]41C1=CC=CC=C1 KBXJHRABGYYAFC-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 7
- 244000043261 Hevea brasiliensis Species 0.000 claims description 6
- 235000021355 Stearic acid Nutrition 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 6
- 125000000524 functional group Chemical group 0.000 claims description 6
- 229920003052 natural elastomer Polymers 0.000 claims description 6
- 229920001194 natural rubber Polymers 0.000 claims description 6
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 6
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims description 6
- 239000012188 paraffin wax Substances 0.000 claims description 6
- 239000008117 stearic acid Substances 0.000 claims description 6
- 229910052717 sulfur Inorganic materials 0.000 claims description 6
- 239000011593 sulfur Substances 0.000 claims description 6
- 239000011787 zinc oxide Substances 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 5
- NWZSZGALRFJKBT-KNIFDHDWSA-N (2s)-2,6-diaminohexanoic acid;(2s)-2-hydroxybutanedioic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O.NCCCC[C@H](N)C(O)=O NWZSZGALRFJKBT-KNIFDHDWSA-N 0.000 claims description 4
- XYPVBKDHERGKJG-UHFFFAOYSA-N 4-(bromomethyl)benzaldehyde Chemical compound BrCC1=CC=C(C=O)C=C1 XYPVBKDHERGKJG-UHFFFAOYSA-N 0.000 claims description 4
- PQLAYKMGZDUDLQ-UHFFFAOYSA-K aluminium bromide Chemical compound Br[Al](Br)Br PQLAYKMGZDUDLQ-UHFFFAOYSA-K 0.000 claims description 4
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 4
- IKDUDTNKRLTJSI-UHFFFAOYSA-N hydrazine monohydrate Substances O.NN IKDUDTNKRLTJSI-UHFFFAOYSA-N 0.000 claims description 4
- 238000005727 Friedel-Crafts reaction Methods 0.000 claims description 3
- 239000002262 Schiff base Substances 0.000 claims description 3
- 150000004753 Schiff bases Chemical class 0.000 claims description 3
- 238000005882 aldol condensation reaction Methods 0.000 claims description 3
- 239000003054 catalyst Substances 0.000 claims description 3
- 239000003153 chemical reaction reagent Substances 0.000 claims description 3
- 238000006698 hydrazinolysis reaction Methods 0.000 claims description 3
- 238000007037 hydroformylation reaction Methods 0.000 claims description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 claims 2
- 230000001070 adhesive effect Effects 0.000 claims 2
- 239000011248 coating agent Substances 0.000 claims 1
- 238000000576 coating method Methods 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 5
- HSJKGGMUJITCBW-UHFFFAOYSA-N 3-hydroxybutanal Chemical compound CC(O)CC=O HSJKGGMUJITCBW-UHFFFAOYSA-N 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 239000006185 dispersion Substances 0.000 abstract description 2
- 230000020169 heat generation Effects 0.000 abstract description 2
- 230000003993 interaction Effects 0.000 abstract description 2
- 241000872198 Serjania polyphylla Species 0.000 abstract 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 9
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 4
- QGJOPFRUJISHPQ-UHFFFAOYSA-N Carbon disulfide Chemical compound S=C=S QGJOPFRUJISHPQ-UHFFFAOYSA-N 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 238000001291 vacuum drying Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 229920002725 thermoplastic elastomer Polymers 0.000 description 2
- 239000004636 vulcanized rubber Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000012295 chemical reaction liquid Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000012043 crude product Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000002390 rotary evaporation Methods 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- C08L7/00—Compositions of natural rubber
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of improvement of lower cover rubber used for a steel wire rope core tubular conveyer belt, in particular to a preparation process of lower cover rubber with low rolling friction resistance, which is designed and prepared to be a novel low rolling friction resistance modifier, wherein interaction between polybutadiene rubber and white carbon black with low rolling resistance precipitation method is enhanced through aldol chemical bond coupling, so that the dispersion performance of the white carbon black with precipitation method is improved, and the realization of the improvement function of the white carbon black with low rolling resistance precipitation method is facilitated; the terminal chain POSS can passivate the free chain end of the polybutadiene rubber, so that the heat generation effect of the rubber material is reduced, and the polybutadiene rubber can realize good compatibility with the base formula of the lower cover rubber; the novel low rolling friction resistance modifier is used as an improver of rolling friction resistance performance, and the low rolling friction resistance lower cover rubber is prepared.
Description
Technical Field
The invention relates to the technical field of improvement of lower cover rubber for a steel wire rope core tubular conveyer belt, in particular to a preparation process of lower cover rubber with low rolling friction resistance.
Background
The tubular conveyor belt is widely used in the fields of coal mines, mining, metallurgy, ports, wharfs and the like. Along with the continuous development of technology, the long-distance tubular conveyor belt is widely applied, and the conveying energy consumption is continuously increased. Along with the improvement of environmental protection requirements and the continuous increase of enterprise operation cost, the development of a low rolling friction resistance tubular conveyer belt is imperative.
Through research on the material conveying system, it is found that: the tubular conveyer belt can pass through six carrier rollers of the tubular conveyer in the process of transporting materials. The cover rubber of the conveyor belt will creep as it passes over and contacts the idler rollers. The rubber will rebound from being compressed to normal as it passes over the idler, which causes some energy loss. This requires an increase in motor drive power and an increase in conveyor tension to ensure proper operation of the conveyor belt. Therefore, frictional rolling resistance between the idlers and the tubular conveyor belt is a major factor in the overall conveyor system energy loss and increased running costs.
The frictional rolling resistance between the tubular conveyer belt and the carrier roller is reduced, the consumption of operation energy can be reduced, and the transmission efficiency can be improved. The low rolling friction resistance tubular conveyer belt is based on the tire low rolling resistance production technology, the excellent characteristics of rubber are fully utilized, the lower cover rubber of the tubular conveyer belt is specially designed, the friction coefficient between the tubular conveyer belt and the carrier roller is changed, the energy consumed by the rubber due to creep is reduced, the service life of the conveyer belt is prolonged, and the production cost is reduced.
The present invention refers to the following references: the doctor's article of Zhang Xianwei, university of Zhejiang, in 2020, discloses the structure and preparation method of cage-type octaphenyl silsesquioxane (8 Ph-POSS), a study on the preparation and performance of functional cage-type oligomeric silsesquioxane and its application in hybrid materials.
Disclosure of Invention
The invention aims to design and prepare a novel low rolling friction resistance modifier, and apply the modifier to lower cover rubber used for a steel wire rope core tubular conveyer belt to obtain the low rolling friction resistance lower cover rubber so as to realize the technical aim of effectively improving the rolling friction resistance performance of the lower cover rubber used for the steel wire rope core tubular conveyer belt.
In order to achieve the technical purpose, the following technical scheme is provided:
a preparation process of a low rolling friction lower cover rubber comprises the following steps:
step one, formula phr of the cover rubber under low rolling friction resistance: natural rubber NR,50-80; butadiene rubber BR,20-50; 25-40 parts of white carbon black by a precipitation method; zinc oxide, 2-8; stearic acid, 0.5-5; 4020,0.1-5 of an anti-aging agent; 0.1-5 parts of an anti-aging agent RD; insoluble sulfur IS7020,0.5-3; paraffin wax, 1-5; 12-25 parts of aldehyde-terminated POSS group functionalized polybutadiene rubber;
step two, one-stage mixing: adding natural rubber NR and butadiene rubber BR into an internal mixer to prepare a section of rubber compound;
preparing a low rolling friction resistance modifier: the low rolling friction resistance modifier is prepared by aldol condensation reaction of aldehyde functional groups of terminal aldehyde POSS functional polybutadiene rubber and silicon hydroxyl of precipitated white carbon black;
step four, two-stage mixing: adding a section of mixed rubber, a low rolling friction resistance modifier, zinc oxide, stearic acid, an anti-aging agent 4020, an anti-aging agent RD, insoluble sulfur IS7020 and paraffin into an internal mixer for mixing, wherein the rotor speed IS 10-60rpm, the mixing time IS 120-240s, and the rubber discharging temperature IS 80-120 ℃ to obtain the low rolling friction resistance lower cover rubber.
Preferably, the preparation step of the low rolling friction resistance modifier comprises the following steps: adding the terminal aldehyde POSS group functionalized polybutadiene rubber into an internal mixer, mixing for 10-60s at the rotating speed of a rotor of 30-50rpm, adding precipitated white carbon black, continuously mixing for 3-8min, and preparing the low rolling friction resistance modifier at the rubber discharging temperature of 50-80 ℃.
Preferably, the preparation method of the aldehyde-terminated POSS-based functionalized polybutadiene rubber comprises the following steps:
step one, preparing aldehyde functional POSS by grafting aldehyde functional groups on phenyl functional groups of cage octaphenyl silsesquioxane by utilizing Friedel-crafts reaction, taking cage octaphenyl silsesquioxane as a matrix, aluminum tribromide as a catalyst and 4-bromomethylbenzaldehyde as an hydroformylation reagent;
step two, utilizing hydrazine hydrate to generate hydrazinolysis reaction with carboxyl functional groups of carboxyl-terminated liquid polybutadiene rubber to generate hydrazine-terminated functionalized polybutadiene rubber;
step three, generating Schiff base reaction between the hydrazide functional group of the terminal hydrazide functional polybutadiene rubber and the aldehyde functional group of the aldehyde functional POSS to generate terminal aldehyde POSS functional polybutadiene rubber linked by acyl hydrazone bond.
Preferably, the carboxyl-terminated liquid polybutadiene rubber has a hydroxyl number of 0.47mmol/g and a molecular weight of 4000g/moL.
Preferably, the preparation process parameters of the first-stage rubber compound are as follows: the speed of the rotor is 30-80rpm, plasticating is 120-240s, and the glue discharging temperature is 90-130 ℃.
The low rolling friction lower cover rubber prepared by the preparation process is used for manufacturing the steel wire rope core tubular conveyer belt cover layer.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention designs and prepares a novel low rolling friction resistance modifier, which enhances the interaction between polybutadiene rubber and low rolling resistance precipitation white carbon black through aldol chemical bond coupling, improves the dispersion performance of the precipitation white carbon black, and is beneficial to the realization of the improvement function of the low rolling resistance precipitation white carbon black; the terminal chain POSS can passivate the free chain end of the polybutadiene rubber, so that the heat generation effect of the rubber material is reduced, and the polybutadiene rubber can realize good compatibility with the base formula of the lower cover rubber;
the novel low rolling friction resistance modifier is used as an improver of rolling friction resistance performance, and the low rolling friction resistance lower cover rubber is prepared.
Drawings
FIG. 1 is a chemical structural formula of an aldehyde-functionalized POSS;
FIG. 2 is a chemical structural formula of a terminal hydrazide functionalized polybutadiene rubber;
FIG. 3 is a chemical structural formula of an aldehyde-terminated POSS-based functionalized polybutadiene rubber;
FIG. 3-1 shows the group R in FIG. 3 2 A chemical structural formula of (a);
FIG. 4 is a chemical formula of a low rolling friction modifier; wherein R is 3 White carbon black by precipitation is shown.
Detailed Description
Example 1:
preparation of aldehyde-functional POSS: the aldehyde functional POSS is prepared by grafting aldehyde functional groups on phenyl functional groups of cage-type octaphenyl silsesquioxane (8 Ph-POSS) by utilizing Friedel-crafts reaction and taking cage-type octaphenyl silsesquioxane (8 Ph-POSS) as a matrix, aluminum tribromide as a catalyst and 4-bromomethylbenzaldehyde as an hydroformylation reagent, and the specific preparation steps are as follows: 10.6g of cage octaphenyl silsesquioxane (8 Ph-POSS), 25g of 4-bromomethylbenzaldehyde, 3.6g of aluminum tribromide and 150mL of carbon disulfide are added into a 250mL three-neck flask, the mixture is placed in a constant temperature oscillator for reaction for 4 hours at 60 ℃, after the reaction is finished, solvents are removed through suction filtration, the mixture is respectively washed by tetrahydrofuran, 3% hydrochloric acid, methanol and absolute ethyl alcohol, and then is placed at 40 ℃ for vacuum drying until the weight is constant, and the aldehyde functional POSS is obtained, wherein the chemical structural formula of the aldehyde functional POSS is shown in figure 1.
Example 2:
preparation of a terminal hydrazide functionalized polybutadiene rubber: the hydrazine hydrate is utilized to generate hydrazinolysis reaction with carboxyl functional groups of the carboxyl-terminated liquid polybutadiene rubber to generate the hydrazide-terminated functional polybutadiene rubber, and the specific preparation steps are as follows: adding 0.4g of hydrazine hydrate, 4g of carboxyl-terminated liquid polybutadiene rubber and 30mL of methanol solvent into a 100mL single-neck flask, reacting for 4 hours in a constant-temperature water bath at 30 ℃ after the addition, standing for precipitation, suction filtration, washing a crude product with methanol, and vacuum drying at 40 ℃ until the weight is constant to obtain the hydrazine-terminated functionalized polybutadiene rubber, wherein the chemical structural formula of the hydrazine-terminated polybutadiene rubber is shown in figure 2;
wherein the hydroxyl value of the carboxyl-terminated liquid polybutadiene rubber is 0.47mmol/g and the molecular weight is 4000g/moL.
Example 3:
preparation of terminal aldehyde POSS-based functionalized polybutadiene rubber: the terminal aldehyde POSS group functionalized polybutadiene rubber linked by an acylhydrazone bond is produced by Schiff base reaction of a hydrazide functional group of the terminal hydrazide functionalized polybutadiene rubber and an aldehyde functional group of the aldehyde functional POSS, and the specific preparation steps are as follows: dissolving 4.5g of aldehyde-functionalized POSS and 3g of terminal hydrazide-functionalized polybutadiene rubber in 50mL of anhydrous tetrahydrofuran, carrying out reflux reaction for 24h at 65 ℃ under the protection of nitrogen, cooling the reaction liquid to room temperature after the reaction is stopped, removing the solvent by rotary evaporation, precipitating the concentrated solution in petroleum ether, and carrying out vacuum drying at 40 ℃ to constant weight to obtain the terminal aldehyde-functionalized POSS-functionalized polybutadiene rubber, wherein the chemical structural formulas are shown in the figures 3 and 3-1;
example 4:
a preparation process of a low rolling friction lower cover rubber comprises the following steps:
step S1, the formula (phr) of the cover rubber under low rolling friction resistance is specifically as follows: natural rubber NR,70; butadiene rubber BR,30; white carbon black by precipitation method, 30; zinc oxide, 5; stearic acid, 2; an anti-aging agent 4020,1.5; anti-aging agent RD,1.5; insoluble sulfur IS7020,1.5; paraffin wax, 2; aldehyde-terminated POSS-based functionalized polybutadiene rubber, 18;
step S2, one-stage mixing: adding natural rubber NR and butadiene rubber BR into an internal mixer, plasticating for 180s at the rotor speed of 50rpm and the rubber discharging temperature of 120 ℃ to prepare a section of rubber compound, and standing for 8 hours for use;
step S3, preparing a low rolling friction resistance modifier: the low rolling friction resistance modifier is prepared by aldol condensation reaction of aldehyde functional groups of terminal aldehyde POSS functional polybutadiene rubber and silicon hydroxyl groups of precipitated white carbon black, the chemical structural formula of the modifier is shown in figure 4, and the preparation method specifically comprises the following steps: adding aldehyde-terminated POSS-based functionalized polybutadiene rubber into an internal mixer, mixing for 30s at the rotor rotating speed of 40rpm, adding precipitated white carbon black, continuously mixing for 4min, discharging at the rubber temperature of 60 ℃, discharging sheets, and cooling to prepare a low rolling friction resistance modifier;
step S4, two-stage mixing: adding a section of mixed rubber, a low rolling friction resistance modifier, zinc oxide, stearic acid, an anti-aging agent 4020, an anti-aging agent RD, insoluble sulfur IS7020 and paraffin into an internal mixer, mixing, wherein the rotor speed IS 30rpm, mixing for 180 seconds, the rubber discharging temperature IS 100 ℃, discharging sheets, and cooling to obtain the lower cover rubber LCA-lrfr-I with low rolling friction resistance.
Example 5:
the end aldehyde POSS-based functionalized polybutadiene rubber in the formula (phr) of the low rolling friction lower cap rubber in example 4 is removed, and step S3 in example 4, namely the step of preparing the low rolling friction modifier, is omitted, and the low rolling friction lower cap rubber LCA-lrfr-II is prepared by referring to example 4 for other technological parameters.
Example 6:
the performance measurement method of the cover rubber under low rolling friction resistance comprises the following specific steps:
(1) GB/T528-2009 determination of tensile stress Strain Properties of vulcanized rubber or thermoplastic rubber;
(2) GB/T9867-2008 "determination of abrasion resistance of vulcanized rubber or thermoplastic rubber" (Rotary roller abrasion machine method);
(3) Dynamic thermo-mechanical (DMA) analysis: and adopting a DMA Q800 dynamic mechanical analyzer, wherein the strain is 1%, the frequency is 10Hz, the heating rate is 3 ℃/min, the temperature range is-80-80 ℃, the maximum vibration load is 2N, and the deformation mode of the double cantilever beam is adopted.
Example 7:
according to the measurement method in example 6, the low rolling friction resistance lower cover tape LCA-lrfr-I prepared in example 4 and the low rolling friction resistance lower cover tape LCA-lrfr-II prepared in example 5 were measured, and the specific measurement results are shown in Table 1 below;
TABLE 1 results of performance measurements of capstock at low rolling friction resistance
From the measurement data in table 1, it can be seen that: the low rolling friction resistance modifier can effectively improve the rolling friction resistance performance of the lower cover rubber.
Claims (7)
1. The preparation process of the low rolling friction lower cover rubber is characterized by comprising the following steps of:
step one, formula phr of the cover rubber under low rolling friction resistance: natural rubber NR,50-80; butadiene rubber BR,20-50; 25-40 parts of white carbon black by a precipitation method; zinc oxide, 2-8; stearic acid, 0.5-5; 4020,0.1-5 of an anti-aging agent; 0.1-5 parts of an anti-aging agent RD; insoluble sulfur IS7020,0.5-3; paraffin wax, 1-5; 12-25 parts of aldehyde-terminated POSS group functionalized polybutadiene rubber;
step two, one-stage mixing: adding natural rubber NR and butadiene rubber BR into an internal mixer to prepare a section of rubber compound;
preparing a low rolling friction resistance modifier: the low rolling friction resistance modifier is prepared by aldol condensation reaction of aldehyde functional groups of terminal aldehyde POSS functional polybutadiene rubber and silicon hydroxyl of precipitated white carbon black;
step four, two-stage mixing: adding a section of mixed rubber, a low rolling friction resistance modifier, zinc oxide, stearic acid, an anti-aging agent 4020, an anti-aging agent RD, insoluble sulfur IS7020 and paraffin into an internal mixer for mixing, wherein the rotor speed IS 10-60rpm, the mixing time IS 120-240s, and the rubber discharging temperature IS 80-120 ℃ to obtain the low rolling friction resistance lower cover rubber.
2. The process for preparing a low rolling friction lower cover stock according to claim 1, wherein the step of preparing the low rolling friction modifier comprises: adding the terminal aldehyde POSS group functionalized polybutadiene rubber into an internal mixer, mixing for 10-60s at the rotating speed of a rotor of 30-50rpm, adding precipitated white carbon black, continuously mixing for 3-8min, and preparing the low rolling friction resistance modifier at the rubber discharging temperature of 50-80 ℃.
3. The process for preparing the low rolling friction lower cover rubber according to claim 1, wherein the preparation method of the aldehyde-terminated POSS-based functionalized polybutadiene rubber is as follows:
step one, preparing aldehyde functional POSS by grafting aldehyde functional groups on phenyl functional groups of cage octaphenyl silsesquioxane by utilizing Friedel-crafts reaction, taking cage octaphenyl silsesquioxane as a matrix, aluminum tribromide as a catalyst and 4-bromomethylbenzaldehyde as an hydroformylation reagent;
step two, utilizing hydrazine hydrate to generate hydrazinolysis reaction with carboxyl functional groups of carboxyl-terminated liquid polybutadiene rubber to generate hydrazine-terminated functionalized polybutadiene rubber;
step three, generating Schiff base reaction between the hydrazide functional group of the terminal hydrazide functional polybutadiene rubber and the aldehyde functional group of the aldehyde functional POSS to generate terminal aldehyde POSS functional polybutadiene rubber linked by acyl hydrazone bond.
4. The process for preparing a low rolling friction lower cover rubber according to claim 3, wherein the hydroxyl value of the carboxyl terminated liquid polybutadiene rubber is 0.47mmol/g and the molecular weight is 4000g/moL.
5. The process for preparing the low rolling friction lower cover rubber according to claim 1, wherein the preparation process parameters of the first-stage rubber compound are as follows: the speed of the rotor is 30-80rpm, plasticating is 120-240s, and the glue discharging temperature is 90-130 ℃.
6. The low rolling friction lower cover rubber prepared by the preparation process according to any one of claims 1 to 5.
7. The low rolling friction lower cap adhesive of claim 6, wherein the low rolling friction lower cap adhesive is used for manufacturing a steel wire rope core tubular conveyor belt coating.
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| CN202310919489.1A CN116903935B (en) | 2023-07-25 | 2023-07-25 | Preparation process of low rolling resistance conveying rubber belt |
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| CN116903935B true CN116903935B (en) | 2024-03-08 |
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Citations (9)
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| US8268399B2 (en) * | 2009-08-19 | 2012-09-18 | Xerox Corporation | Polyhedral oligomeric silsesquioxane image conditioning coating |
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