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Anti-cracking and anti-aging radial tire tread base rubber and preparation method of rubber

A radial tire and tread base technology, applied in the field of tire rubber, can solve the problems of poor processing performance, carcass cracking, rubber tearing and falling off, etc., to improve strength and melt elasticity, reduce tire rolling resistance, and improve tire rolling resistance. The effect of carcass stress

Active Publication Date: 2021-01-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In view of the poor compatibility of natural rubber (NR) and BR used in existing tires, NR and BR in the vulcanized rubber have a phase separation phenomenon, which can easily lead to tearing of the rubber material and cracking of the carcass. Defects such as aging, or the molecular weight distribution of the BIR synthesized by the existing lithium-based catalysis is too narrow, the processability is poor, the content of T-1,4 is low and easy to crystallize, or the distribution of BIR micro-blocks or block chains prepared by rare earth catalysis is not obvious and High cost, which limits its application

Method used

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  • Anti-cracking and anti-aging radial tire tread base rubber and preparation method of rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Add 7000mL of n-hexane to a 10-liter polymerization kettle under the protection of nitrogen, start stirring, then add 0.05mL of anisole with a mass fraction of 99.0%, and then raise the temperature of the polymerization solution to 70°C; Press the pre-selected mixed monomer composed of butadiene, isoprene and divinylbenzene into the polymerization kettle (the mixed monomer consists of 1055g butadiene, 305g isoprene and 1.5mL divinylbenzene Benzene), while continuously adding 0.70mol / L of NBL12mL from the sight glass of the polymerization kettle, the polymerization time of monomer and NBL being continuously added to the polymerization kettle at the same time is 60min, and the polymerization reaction is carried out under adiabatic conditions. When the monomer and NBL After the addition, the polymerization temperature reaches 85-90°C. At this time, add 50mL of isoprene for the second molecular chain extension at one time, and react for 20 minutes at the temperature of the p...

Embodiment 2

[0076] Keep the relevant process conditions in Example 1 unchanged, only 0.08mL of anisole is added, and the mixed monomer used in the first stage is composed of 1055g of butadiene, 305g of isoprene and 1.8mL of divinylbenzene , The added butyllithium is 16mL, the continuous feeding time of mixed monomer and NBL is 70min, the amount of isoprene added in the second stage is 80mL, and the N,N'-dimethylimidazolinone used for capping the active chain lithium 15mL.

[0077] The results are measured: the number average molecular weight Mn=12.6×10 of raw rubber 4 , molecular weight distribution index D=1.83; the 1,2-addition unit content in the polybutadiene unit in the raw rubber is 7.87%, and the trans 1,4-addition unit content is 81.34%; the polyisoprene unit The content of 3,4-addition units is 5.64%, and the content of trans 1,4-addition units is 87.21%. The Mooney viscosity ML of raw rubber is 50.6; Tg is -78.8°C.

Embodiment 3

[0079] The relevant process conditions in Example 1 remain unchanged, only 0.10 mL of anisole is added, and the mixed monomer used in the first stage is composed of 800 g of butadiene, 533 g of isoprene and 2.2 mL of divinylbenzene , the added butyllithium is 14mL, the continuous feeding time of mixed monomer and NBL is 80min, the amount of isoprene added in the second stage is 100mL, and the amount of 0.71mol / L tributyltin chloride used for capping the active chain lithium is 14 mL of hexane solution.

[0080] The result is measured: the number average molecular weight Mn=14.2×10 of raw rubber 4 , molecular weight distribution index D=1.88; the content of 1,2-addition units in polybutadiene units in raw rubber is 8.54%, and the content of trans 1,4-addition units is 82.65%; the content of polyisoprene units in The content of 3,4-addition units is 7.48%, and the content of trans 1,4-addition units is 85.94%. The Mooney viscosity ML of raw rubber is 56.8; Tg is -81.4°C.

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Abstract

The invention discloses an anti-cracking and anti-aging radial tire tread base rubber and a preparation method thereof. The method mainly adopts combined use of the butadiene-isoprene rubber and natural rubber to prepare the radial tire tread base rubber. The butadiene-isoprene rubber has broad distribution, high melt elasticity, high branching, high trans 1, 4-addition unit content, and having both polyisoprene microblocks and long chain homopolymer blocks. pyridine. The tire base composite material has excellent processability, and the composite vulcanized rubber material has the characteristics of good compatibility, high strength, high hardness, low heat generation, flexing resistance, no cracking and aging resistance.

Description

technical field [0001] The invention relates to a rubber for tread base of a radial tire, in particular to a radial tire tire whose main components are butyl-pentyl rubber and natural rubber with the characteristics of block distribution, trans-1,4 structure, and wide distribution. The rubber for surface base and its preparation method belong to the field of tire rubber. Background technique [0002] Since the radial tire was introduced into China from abroad in the 1980s, the tire sidewall rubber is mainly composed of 50% natural rubber and 50% BR-9000. Because the Tg of BR-9000 is -100°C, the molecular chain of the polymer is highly regular and has a strong tendency to crystallize. It starts to harden at -35°C and loses elasticity. If there is a small amount of polyisoprene ( IP) unit can reduce the crystallization of the copolymer, and because it shows good low temperature resistance, and the belt layer of the tire is usually used in combination with natural rubber (NR) ...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L9/00C08L91/00C08K13/02C08K3/04C08K3/36C08K3/22C08K5/09C08F297/04B60C1/00
CPCC08L7/00C08F297/046B60C1/0016C08L2205/03C08L2201/08C08K2003/2296C08L9/00C08L91/00C08K13/02C08K3/04C08K3/36C08K3/22C08K5/09Y02T10/86
Inventor 张建国邢立江蒋文英李倍蕾
Owner CHINA PETROLEUM & CHEM CORP
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