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High-performance radial tire tread base rubber and preparation method thereof

A radial tire and tread base technology, applied in the field of tire rubber, can solve problems such as easy aging, BIR micro-block or block chain link distribution is not obvious, carcass cracks, etc.

Pending 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 will easily lead to tearing of the rubber material and cracking of the carcass. Defects such as aging, or the molecular weight distribution of BIR synthesized by 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 the preparation cost Insufficient high level, resulting in limited application

Method used

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  • High-performance radial tire tread base rubber and preparation method thereof
  • High-performance radial tire tread base rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Add 7000mL of n-hexane and 1.0mL of 1.5-diazobicyclo[4,3,0]-5-nonene (DBN) into a 10-liter polymerization kettle under nitrogen protection, and then add it to the polymerization kettle under nitrogen pressure. 1060g of butadiene and 300g of isoprene, start stirring, then raise the temperature of the polymerization solution to 75°C, nitrogen protection pressure 0.35Mpa, then add 0.72mol / L NBL 13.5mL, then drop 9.5 One mmol of DVB dilute solution in hexane is added dropwise for 45 minutes. At this time, the temperature of the glue solution rises to the highest temperature of 95.6°C after 45 minutes of polymerization reaction, and the temperature rise rate is 0.46°C / min. Then continue to stir and react for 20 minutes, then add 13 mL of 0.7 mol / L N,N’-dimethylimidazolinone to the polymerization kettle, and react at a temperature not higher than 90°C for 15-20 minutes.

[0073] Then, the polymer glue was removed from the polymerization kettle, and 3.5g of antioxidant 1076 wa...

Embodiment 2

[0076] Keep the relevant process conditions in Example 1 unchanged, only 0.9mL of DBN is added, the mixed monomer used in the first stage is composed of 1100g of butadiene and 350g of isoprene, and the added butyllithium is 12mL 10.8mmol of divinylbenzene for continuous dropping, and the continuous dropping time is 50min; 12mL of N,N'-dimethylimidazolidinone for lithium termination of the second active chain.

[0077] The results are measured: the number average molecular weight Mn=16.78×10 of raw rubber 4 , the molecular weight distribution index is 2.74; the 1,2-addition unit content in the polybutadiene unit in the raw rubber is 8.43%, and the trans 1,4-addition unit content is 78.56%; the polyisoprene unit in the The 3,4-addition unit content is 6.42%, and the trans 1,4-addition unit content is 81.86%. The Mooney viscosity ML of the raw rubber is 58.5; the Tg is -84.6°C.

Embodiment 3

[0079]Keep the relevant process conditions in Example 2 unchanged, only 1.2mL of DBU is added, the mixed monomer used in the first stage is composed of 900g of butadiene and 500g of isoprene, and the added butyllithium is 10mL 11.8 mmol of divinylbenzene for continuous dropwise addition, and the continuous dropwise addition time is 48 minutes. 10mL of N,N'-dimethylimidazolidinone used for the lithium termination of the second active chain was reacted at 85-90°C for 20min, and then 0.7mol / L of tributyltin chloride was added to the polymerization kettle. After reacting 9mL of hexane solution at 80-85°C for 20min, it is ready.

[0080] The results are measured: the number average molecular weight Mn=19.24×10 of raw rubber 4 , molecular weight distribution index 2.86; 1,2-addition unit content in polybutadiene unit in raw rubber is 7.46%, trans 1,4-addition unit content is 78.94%; polyisoprene unit 3 , The content of 4-addition units is 6.23%, and the content of trans-1,4-additi...

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Abstract

The invention discloses a high-performance radial tire tread base rubber and a preparation method thereof, and the method mainly adopts combined use of butadiene-isoprene rubber and natural rubber toprepare the tire tread base composite rubber. The butadiene-styrene rubber has broad distribution, high melt elasticity, high branching, high trans 1, 4-addition unit content, and length gradient distribution of polyisoprene blocks. The tire tread base composite rubber material has excellent processability, and the composite vulcanized rubber material shows good compatibility, high strength, highhardness, low heat generation, flexing resistance, no cracking, aging resistance and the like.

Description

technical field [0001] The present invention relates to a radial tire tread base rubber, in particular to a polyisoprene block with chain lengths in orderly gradient distribution, trans-1,4 structure, wide distribution and other characteristics The invention relates to a radial tire tread base rubber with polybutadiene-isoprene rubber and natural rubber as main components and a preparation method thereof, belonging 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 ...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L9/00C08K13/02C08K3/04C08K3/36C08K3/22C08K5/09B60C1/00
CPCC08L7/00B60C1/0016C08L2201/08C08K2003/2296C08K2201/006C08L9/00C08K13/02C08K3/04C08K3/36C08K3/22C08K5/09Y02T10/86
Inventor 张建国李楚新姚琼蒋文英李倍蕾朱建军
Owner CHINA PETROLEUM & CHEM CORP
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