Tire sidewall rubber material based on gradient block lithium-series BIR and preparation method thereof

A sidewall rubber and gradient technology, applied in the field of tire rubber, can solve the problems of narrow BIR molecular weight distribution, poor processability, and low T-1,4 content

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

[0013] In view of the poor compatibility of the BR used in the sidewall of the existing tire, the NR and BR in the vulcanized rubber have a phase separation phenomenon, which may easily lead to tearing of the rubber material and cracking of the carcass. Defects such as cracking and easy aging, or BIR synthesized by lithium-based catalysis has too narrow molecular weight distribution, poor processability, low T-1,4 content and easy crystallization, or BIR micro-block or block segment distribution prepared by rare earth catalysis is not obvious And the high cost of preparation limits its application

Method used

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  • Tire sidewall rubber material based on gradient block lithium-series BIR and preparation method thereof
  • Tire sidewall rubber material based on gradient block lithium-series BIR and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] 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.

[0078] Then, the polymer glue was removed from the polymerization kettle, and 3.5g of antioxidant 1076 wa...

Embodiment 2

[0081] 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.

[0082] 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

[0084] 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.

[0085] 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-addit...

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Abstract

The invention discloses a tire sidewall rubber material based on gradient block lithium BIR and a preparation method thereof, and the method mainly adopts combined use of the lithium-series BIR and natural rubber to prepare the tire sidewall rubber material. The lithium-series BIR has broad distribution, high melt elasticity, high branching, high trans 1, 4-addition unit content, and length gradient distribution of polyisoprene blocks. The sidewall composite rubber material has excellent processability, and the composite vulcanized rubber material has the characteristics of good compatibility,high strength, low heat generation, flexing resistance, cracking resistance and aging resistance.

Description

technical field [0001] The present invention relates to a tire sidewall compound, in particular to a gradient embedding compound characterized by a plurality of polyisoprene blocks with orderly gradient distribution of chain length, trans-1,4 structure, and wide distribution. The invention relates to a tire sidewall compound with lithium-based BIR 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L9/00C08L61/06C08K13/02C08K3/04C08K5/548C08K3/22C08K5/09B60C1/00
CPCC08L7/00C08L9/00B60C1/0025C08L2205/035C08L2201/08C08K2003/2296C08L61/06C08K13/02C08K3/04C08K5/548C08K3/22C08K5/09Y02T10/86
Inventor 张建国贺卉昌李倍蕾蒋文英郭灵朱建军
Owner CHINA PETROLEUM & CHEM CORP
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