CN117799081A - Method for applying epoxidized liquid natural rubber to white carbon black rubber compound - Google Patents
Method for applying epoxidized liquid natural rubber to white carbon black rubber compound Download PDFInfo
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- CN117799081A CN117799081A CN202311857474.3A CN202311857474A CN117799081A CN 117799081 A CN117799081 A CN 117799081A CN 202311857474 A CN202311857474 A CN 202311857474A CN 117799081 A CN117799081 A CN 117799081A
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- natural rubber
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- 244000043261 Hevea brasiliensis Species 0.000 title claims abstract description 83
- 229920003052 natural elastomer Polymers 0.000 title claims abstract description 83
- 229920001194 natural rubber Polymers 0.000 title claims abstract description 83
- 239000007788 liquid Substances 0.000 title claims abstract description 73
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000006229 carbon black Substances 0.000 title claims abstract description 50
- 229920001971 elastomer Polymers 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 26
- 150000001875 compounds Chemical class 0.000 title claims abstract description 20
- 239000003999 initiator Substances 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 15
- 150000003384 small molecules Chemical class 0.000 claims abstract description 12
- 238000001816 cooling Methods 0.000 claims abstract description 11
- 239000004014 plasticizer Substances 0.000 claims abstract description 9
- 238000007142 ring opening reaction Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 230000003712 anti-aging effect Effects 0.000 claims description 4
- 125000004432 carbon atom Chemical group C* 0.000 claims description 2
- 238000011049 filling Methods 0.000 claims description 2
- 150000002926 oxygen Chemical class 0.000 claims description 2
- 239000012934 organic peroxide initiator Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 18
- 238000004513 sizing Methods 0.000 abstract description 8
- 239000004593 Epoxy Substances 0.000 abstract description 6
- 239000003963 antioxidant agent Substances 0.000 abstract description 5
- 230000003078 antioxidant effect Effects 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 4
- 230000000052 comparative effect Effects 0.000 description 8
- 239000006087 Silane Coupling Agent Substances 0.000 description 7
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 6
- 239000007822 coupling agent Substances 0.000 description 6
- 238000002360 preparation method Methods 0.000 description 5
- BAPJBEWLBFYGME-UHFFFAOYSA-N Methyl acrylate Chemical compound COC(=O)C=C BAPJBEWLBFYGME-UHFFFAOYSA-N 0.000 description 4
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 4
- OZAIFHULBGXAKX-UHFFFAOYSA-N 2-(2-cyanopropan-2-yldiazenyl)-2-methylpropanenitrile Chemical compound N#CC(C)(C)N=NC(C)(C)C#N OZAIFHULBGXAKX-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 3
- 239000013067 intermediate product Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000012855 volatile organic compound Substances 0.000 description 3
- 239000011787 zinc oxide Substances 0.000 description 3
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- HFBMWMNUJJDEQZ-UHFFFAOYSA-N acryloyl chloride Chemical compound ClC(=O)C=C HFBMWMNUJJDEQZ-UHFFFAOYSA-N 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 235000019253 formic acid Nutrition 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000002245 particle Substances 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
- 238000010008 shearing Methods 0.000 description 2
- 238000002444 silanisation Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000006735 epoxidation reaction Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000006884 silylation reaction Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- PXQLVRUNWNTZOS-UHFFFAOYSA-N sulfanyl Chemical compound [SH] PXQLVRUNWNTZOS-UHFFFAOYSA-N 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention provides a method for applying epoxidized liquid natural rubber to white carbon black rubber compound, which comprises the following steps: the natural rubber is put into an internal mixer for plasticating, the natural rubber is conveyed into a first double-screw extruder through a continuous feeding device, the obtained liquid natural rubber enters a second double-screw extruder through a conveying device, an initiator and unsaturated polar small molecules are added through a side feeding device, the liquid natural rubber and the unsaturated polar small molecules fully react, and the liquid natural rubber with the epoxy degree of 6-15% is obtained after cooling. Adding natural rubber, white carbon black, epoxidized liquid natural rubber, plasticizer, antioxidant and the like into an internal mixer according to a certain proportion for mixing, conveying the mixture into a third double-screw extruder through a continuous conveying device to complete ring-opening reaction of the epoxidized liquid natural rubber and the surface of the white carbon black, conveying the material into a fourth single-screw extruder to complete cooling of the sizing material, and extruding the sizing material into sheets.
Description
Technical Field
The invention relates to the field of chemical materials, in particular to a method for applying epoxidized liquid natural rubber to white carbon black rubber compound.
Background
With the increasing sales of automobiles, consumers put higher demands on the performance of tires and the oil consumption of automobiles, and the tires are required to have excellent wet skid resistance, lower rolling resistance and good wear resistance, so the concept of green tires is proposed by Mielin corporation, and the application of white carbon black in tires is also becoming wider and wider. However, white carbon black has a large number of hydroxyl groups on the surface, has strong polarity, and is very easy to form hydrogen bonds among particles so as to generate flocculation phenomenon, so that interaction between the white carbon black and nonpolar rubber is difficult to occur. Therefore, in actual industrial production, silane coupling agents are often used for chemically modifying the surface of white carbon black, and strong interaction between the white carbon black and rubber is realized through a silanization reaction. The white carbon black is utilized to reinforce rubber, when the white carbon black and the rubber undergo a silanization reaction, a silane coupling agent is required to be added, the reaction temperature is required to be strictly controlled, volatile organic compounds such as methanol, ethanol and the like can be generated, the performance of the rubber is influenced, and the subsequent processing and use are also not facilitated.
In order to improve the comprehensive performance of the white carbon black/rubber composite material and reduce the generation of volatile organic compounds, some researchers try to functionalize rubber molecular chains, introduce polar groups and improve the combination effect of rubber and white carbon black, for example She Xin and the like (CN 202111269466.8 is a liquid rubber modified coupling agent, a preparation method, application and modified white carbon black), a method for preparing the liquid rubber modified coupling agent is provided, liquid rubber with double bonds, a silane coupling agent with mercapto or polysulfide and an organic solvent are uniformly mixed and then reacted to obtain an intermediate product, after a rubber vulcanizing agent and other rubber additives are added into the intermediate product for presulfiding, the solvent is removed to obtain the liquid rubber modified coupling agent, and the reinforcing effect is better than that of the traditional coupling agent by introducing polysulfide into the liquid rubber. Shen Xianrong et al (CN 201910726354.7, a preparation of zinc oxide grafted with liquid rubber on the surface) propose a method, wherein zinc oxide particles are dispersed in a solvent, then a coupling agent with double bonds, an initiator and liquid rubber are added for reaction at a certain temperature, and after the reaction is finished, the zinc oxide grafted with liquid rubber on the surface is prepared by washing and drying the solvent. The preparation process of the two methods is complicated, the post-treatment procedures are more, and no report of industrial production is available at present.
Therefore, we propose a method for preparing epoxidized liquid rubber as a coupling agent in industrial production, which can not only reduce volatile organic compounds generated by silylation reaction, but also improve the compatibility between rubber and white carbon black.
Disclosure of Invention
The present invention provides a method for applying epoxidized liquid natural rubber to white carbon black compounds to solve or at least alleviate at least one of the problems of the prior art.
The invention provides a method for applying epoxidized liquid natural rubber to white carbon black rubber compound, which comprises the following steps:
adding natural rubber into a first internal mixer for mixing, conveying the natural rubber into a first double-screw extruder through a continuous feeding device, and controlling the temperature of the first double-screw extruder to be 200-300 ℃ and realizing the breakage of rubber molecular chains within 3-7 min to obtain liquid natural rubber;
conveying the liquid natural rubber into a second double-screw extruder, adding an initiator and unsaturated polar small molecules through a side feeding device, controlling the temperature of the second double-screw extruder to be 60-130 ℃ so that the liquid natural rubber and the unsaturated polar small molecules fully react for 4-7 min, and obtaining the epoxidized liquid natural rubber;
adding natural rubber, white carbon black, the epoxidized liquid natural rubber, a plasticizer and an anti-aging agent into a second internal mixer according to a certain proportion, mixing, conveying into a third double-screw extruder through a continuous conveying device, controlling the temperature of the third double-screw extruder to be 40-80 ℃, completing ring-opening reaction of the epoxidized liquid natural rubber and the surface of the white carbon black within 4-8 min, conveying into a fourth single-screw extruder after reaction, cooling for 3-5 min, and extruding into tablets.
As a preferred embodiment of the present invention, the aspect ratio of the first twin-screw extruder is (42 to 56): 1, the screw rotating speed is 130-200 rpm.
In a preferred embodiment of the present invention, the unsaturated polar small molecule includes an unsaturated oxygen-containing small molecule having 1 to 8 carbon atoms.
As a preferred embodiment of the present invention, the initiator includes a radical-type initiator including an azo-type initiator and an organic peroxide-type initiator.
As a preferred embodiment of the present invention, the second twin-screw extruder has an aspect ratio of (40 to 56): 1, the screw rotating speed is 110-180 rpm.
As a preferable implementation mode of the invention, the second internal mixer is a meshed internal mixer, the rotor speed of the internal mixer is 35-70 r/min, the filling coefficient is 0.4-0.7, the mixing time is 180-400 s, and the upper ram pressure is 4-8 kg/cm 2 。
As a preferred embodiment of the present invention, the mass ratio of the natural rubber, the white carbon black, the epoxidized liquid natural rubber, the plasticizer, and the antioxidant is 100: (50-100): (10-30): (3-10): (0-5).
As a preferred embodiment of the present invention, the aspect ratio of the third twin-screw extruder is (40 to 52): 1, the screw rotating speed is 60-120 rpm.
As a preferred embodiment of the present invention, the aspect ratio of the fourth single screw extruder is (24 to 32): 1, the screw rotating speed is 50-80 rpm.
The invention provides a white carbon black rubber compound using epoxidized liquid natural rubber, which is prepared by the method for applying the epoxidized liquid natural rubber to the white carbon black rubber compound.
Compared with the prior art, the invention has at least the following beneficial effects:
the natural rubber has poor heat-conducting property and good elasticity, and is unfavorable for direct processing, so that the natural rubber is firstly put into an internal mixer for plasticating, and is convenient for the subsequent screw extruder to eat and shear. The materials enter a first double-screw extruder, the rubber molecular chain is effectively broken under the high shearing action of the screw by adjusting the temperature of each section of the screw, the rubber is gradually changed from solid state to liquid state, and a large amount of free radicals capable of reacting with unsaturated polar small molecules are generated. After the materials enter a second double-screw extruder, unsaturated polar small molecules and an initiator are added into the extruder through a side feeding device, and the double-screw extruder provides temperature conditions required by the reaction, so that the epoxidation preparation of the liquid natural rubber is realized. The prepared epoxidized liquid natural rubber does not need to be cooled and stored, directly enters a second internal mixer through a conveying device, is mixed with substances such as natural rubber, white carbon black, plasticizer, anti-aging agent and the like for a certain time, and meanwhile, the epoxidized liquid natural rubber still has the temperature, good fluidity, time and labor conservation and good mixing effect when being mixed with other substances. And the epoxy liquid natural rubber enters a third double-screw extruder, and polar groups exist on the molecular chain of the epoxy liquid natural rubber and are easily combined with hydroxyl groups on the surface of the white carbon black, so that the screw extruder is not required to provide high reaction temperature and strong shearing, and a good reaction effect can be realized. And (3) feeding the mixture into a fourth single-screw extruder, wherein the whole temperature of the material is low, and the materials can be cooled by selecting a screw with small length-diameter ratio and a low screw rotating speed, so that the white carbon black mixed film is finally obtained by extrusion.
The invention reasonably connects and connects the preparation of the epoxidized liquid natural rubber, the mixing and cooling of materials such as white carbon black and the like in series while taking the current situation of the industry as a basis, fully utilizes the characteristics of intermediate products, adjusts the temperature, the length-diameter ratio and the rotating speed of different screw extruders, and realizes the improvement of the performance of the white carbon black compound rubber while reducing the use of energy consumption.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below. The present invention provides exemplary embodiments, however, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.
Example 1
Adding natural rubber into a first internal mixer for mixing, conveying the natural rubber into a first double-screw extruder through a continuous feeding device, controlling the temperature of the screw extruder to be 240 ℃, controlling the length-diameter ratio of the screw to be 44:1, controlling the rotating speed of the screw to be 160rpm, realizing breaking of rubber molecular chains within 6min, conveying the obtained liquid natural rubber into a second double-screw extruder, adding an initiator azodiisobutyronitrile and formic acid through a side feeding device, controlling the temperature of the screw extruder to be 110 ℃, controlling the length-diameter ratio of the screw to be 40:1, controlling the rotating speed of the screw to be 150rpm, and enabling the liquid rubber to fully react with the formic acid for 6min to obtain the liquid natural rubber with the epoxy degree of 11%. Natural rubber, white carbon black, epoxidized liquid natural rubber, plasticizer, antioxidant and the like are mixed according to a ratio of 100:60:23:5:2 into a second internal mixer for mixing, conveying the mixture into a third double-screw extruder through a continuous conveying device, controlling the temperature of the screw extruder to be 68 ℃, controlling the length-diameter ratio of a screw to be 40:1, finishing ring-opening reaction of epoxidized liquid natural rubber and the surface of white carbon black within 6min, conveying the material into a fourth single-screw extruder, wherein the length-diameter ratio of the screw is 28:1, the screw speed is 76rpm, cooling is carried out for 4min, and cooling and extrusion of the sizing material into sheets are completed.
Example 2
Adding natural rubber into a first internal mixer for mixing, conveying the natural rubber into a first double-screw extruder through a continuous feeding device, controlling the temperature of the screw extruder to be 255 ℃, controlling the length-diameter ratio of the screw to be 46:1, realizing breaking of rubber molecular chains within 6min, conveying the obtained liquid natural rubber into a second double-screw extruder, adding an initiator azodiisobutyronitrile and acrylic chloride through a side feeding device, controlling the temperature of the screw extruder to be 115 ℃, controlling the length-diameter ratio of the screw to be 40:1, controlling the rotational speed of the screw to be 156rpm, and fully reacting the liquid rubber with acrylic chloride for 6min to obtain the liquid natural rubber with the epoxy degree of 13%. Natural rubber, white carbon black, epoxidized liquid natural rubber, plasticizer, antioxidant and the like are mixed according to a ratio of 100:58:25:5:2 into a second internal mixer for mixing, conveying the mixture into a third double-screw extruder through a continuous conveying device, controlling the temperature of the screw extruder to be 71 ℃, controlling the length-diameter ratio of a screw to be 42:1, finishing ring-opening reaction of epoxidized liquid natural rubber and the surface of white carbon black within 6min, conveying the material into a fourth single-screw extruder, wherein the length-diameter ratio of the screw is 26:1, the screw rotating speed is 72rpm, cooling is carried out for 4min, and the cooling of the sizing material is finished and the sizing material is extruded into a sheet.
Example 3
Adding natural rubber into a first internal mixer for mixing, conveying the natural rubber into a first double-screw extruder through a continuous feeding device, controlling the temperature of the screw extruder to be 257 ℃, controlling the length-diameter ratio of the screw to be 44:1, realizing breaking of rubber molecular chains within 6min, conveying the obtained liquid natural rubber into a second double-screw extruder, adding an initiator azodiisobutyronitrile and methyl acrylate through a side feeding device, controlling the temperature of the screw extruder to be 118 ℃, controlling the length-diameter ratio of the screw to be 42:1, controlling the rotational speed of the screw to be 164rpm, and fully reacting the liquid rubber with the methyl acrylate for 7min to obtain the liquid natural rubber with the epoxy degree of 12%. Natural rubber, white carbon black, epoxidized liquid natural rubber, plasticizer, antioxidant and the like are mixed according to a ratio of 100:55:22:6:3 is added into a second internal mixer for mixing, and is conveyed into a third double-screw extruder through a continuous conveying device, the temperature of the screw extruder is controlled to be 73 ℃, the length-diameter ratio of the screw is 40:1, the rotation speed of the screw is 89rpm, the ring-opening reaction of the epoxidized liquid natural rubber and the surface of the white carbon black is completed within 5min, the materials are conveyed into a fourth single-screw extruder, and the length-diameter ratio of the screw is 24:1, the screw rotating speed is 69rpm, cooling is carried out for 3min, and the cooling of the sizing material is finished and the sizing material is extruded into a sheet.
Comparative example 1
In comparison with example 1, comparative example 1 was added with the same amount of silane coupling agent KH580 as in example 1, without adding epoxidized liquid natural rubber.
Comparative example 2
In comparison with example 2, comparative example 2 was added with the same amount of silane coupling agent KH580 as in example 2, without adding epoxidized liquid natural rubber.
Comparative example 3
In comparison with example 3, comparative example 3 was added with the same amount of silane coupling agent KH580 as in example 3, without adding epoxidized liquid natural rubber.
Table 1 performance data for examples 1-3 and comparative examples 1-3
By comparing the static mechanical property and the dynamic mechanical property of the examples with those of the comparative examples, the performance of the white carbon black mixed sizing material is better by using the epoxidized liquid natural rubber to replace the traditional silane coupling agent.
It should be appreciated that in the above description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the method of the invention should not be interpreted as reflecting the intention: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the claims, any of the claimed embodiments may be used in any combination.
The foregoing is merely illustrative of the embodiments of the present invention and is not intended to be limiting in any way or nature, and it should be noted that modifications and additions to the ordinary skill in the art without departing from the method of the present invention are also contemplated as falling within the scope of the present invention; equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, and modifications, to which the invention pertains; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the protection scope of the present invention.
Claims (10)
1. A method of applying epoxidized liquid natural rubber to white carbon black compounds, the method comprising:
adding natural rubber into a first internal mixer for mixing, conveying the natural rubber into a first double-screw extruder through a continuous feeding device, and controlling the temperature of the first double-screw extruder to be 200-300 ℃ and realizing the breakage of rubber molecular chains within 3-7 min to obtain liquid natural rubber;
conveying the liquid natural rubber into a second double-screw extruder, adding an initiator and unsaturated polar small molecules through a side feeding device, controlling the temperature of the second double-screw extruder to be 60-130 ℃ so that the liquid natural rubber and the unsaturated polar small molecules fully react for 4-7 min, and obtaining the epoxidized liquid natural rubber;
adding natural rubber, white carbon black, the epoxidized liquid natural rubber, a plasticizer and an anti-aging agent into a second internal mixer according to a certain proportion, mixing, conveying into a third double-screw extruder through a continuous conveying device, controlling the temperature of the third double-screw extruder to be 40-80 ℃, completing ring-opening reaction of the epoxidized liquid natural rubber and the surface of the white carbon black within 4-8 min, conveying into a fourth single-screw extruder after reaction, cooling for 3-5 min, and extruding into tablets.
2. The method of using epoxidized liquid natural rubber in white carbon black compound according to claim 1, wherein the first twin screw extruder has an aspect ratio of (42 to 56): 1, the screw rotating speed is 130-200 rpm.
3. The method for applying the epoxidized liquid natural rubber to the white carbon black compound according to claim 1, wherein the unsaturated polar small molecules comprise unsaturated oxygen-containing small molecules with carbon atoms of 1 to 8.
4. The method of claim 1, wherein the initiator comprises a radical initiator, and the radical initiator comprises an azo initiator and an organic peroxide initiator.
5. The method of using epoxidized liquid natural rubber in white carbon black compound according to claim 1, wherein the aspect ratio of the second twin screw extruder is (40 to 56): 1, the screw rotating speed is 110-180 rpm.
6. The method for applying the epoxidized liquid natural rubber to the white carbon black compound according to claim 1, wherein the second internal mixer is a meshed internal mixer, the rotor speed of the internal mixer is 35-70 r/min, the filling coefficient is 0.4-0.7, the mixing duration is 180-400 s, and the upper ram pressure is 4-8 kg/cm 2 。
7. The method for applying the epoxidized liquid natural rubber to the white carbon black compound according to claim 1, wherein the mass ratio of the natural rubber, the white carbon black, the epoxidized liquid natural rubber, the plasticizer and the anti-aging agent is 100: (50-100): (10-30): (3-10): (0-5).
8. The method of using epoxidized liquid natural rubber in white carbon black compound according to claim 1, wherein the aspect ratio of the third twin-screw extruder is (40 to 52): 1, the screw rotating speed is 60-120 rpm.
9. The method of using epoxidized liquid natural rubber in white carbon black compound according to claims 1 to 8, wherein the aspect ratio of the fourth single screw extruder is (24 to 32): 1, the screw rotating speed is 50-80 rpm.
10. The white carbon black rubber compound using the epoxidized liquid natural rubber is characterized in that the white carbon black rubber compound using the epoxidized liquid natural rubber is prepared by the method for using the epoxidized liquid natural rubber in the white carbon black rubber compound according to any one of claims 1 to 9.
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