Block copolymer, block copolymer composition, preparation method of block copolymer, vulcanized rubber, application of vulcanized rubber, tire tread and tire

A technology of block copolymer and composition, which is applied in the tire tread and tire fields, can solve the problems affecting the dispersion of additives, rubber vulcanization and final performance, general wet skid resistance, poor rubber wet skid resistance, etc., to improve Anti-wet performance, reduction of end effect, reduction of rolling resistance effect

Active Publication Date: 2020-04-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Studies have shown that there are obvious contradictions between the different properties of various general-purpose tread rubbers. Rubber with low rolling resistance and good wear resistance has poor wet skid resistance, and vice versa. No general-purpose rubber can meet these comprehensive requirements at the same time.
[0006] Of the various general-purpose rubbers currently used, butadiene rubber is the most flexible, with low rolling resistance, but poor wet skid resistance; natural rubber is moderately flexible, with good rolling resistance, but general wet skid resistance; Styrene butadiene rubber with higher ethylene content has superior wet skid resistance, but greater rolling resistance
[0007] In order to try to balance the relationship between various properties, most of the different rubber types are used together. This mechanical blending method leads to the separation of the blended phases, which affects the dispersion of various additives, the vulcanization of rubber and the final performance.

Method used

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  • Block copolymer, block copolymer composition, preparation method of block copolymer, vulcanized rubber, application of vulcanized rubber, tire tread and tire
  • Block copolymer, block copolymer composition, preparation method of block copolymer, vulcanized rubber, application of vulcanized rubber, tire tread and tire
  • Block copolymer, block copolymer composition, preparation method of block copolymer, vulcanized rubber, application of vulcanized rubber, tire tread and tire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0125] (1) Under the protection of high-purity nitrogen, add 2200g cyclohexane and 145g butadiene to a 5L batch polymerization reactor equipped with an anchor stirrer in sequence, start stirring, heat the circulating water bath to 55°C, and add 2.4mL n-butyllithium solution (1.0M hexane solution, the same below) initiates the polymerization reaction, reacts at 70°C for 30min (monomer conversion rate is more than 99% by weight), and obtains the first polymerization reaction containing butadiene homopolymerization segment. Mixture.

[0126] (2) Add 4.8mL divinylbenzene hexane solution (mass concentration is 80.32%, wherein, the mass concentration of p-DVB is 26.2%, the mass concentration of m-DVB is 54.12% in the reactor, purchased from Bailingwei Reagent Co., Ltd., dilute the commercially available solution to 0.4M for use, the same below), and react at 70° C. for 25 minutes to obtain the second polymerization mixture.

[0127] (3) Add 2.4mL tetrahydrofuran (THF) and 1.4mL pot...

Embodiment 2

[0131] (1) Under the protection of high-purity nitrogen, add 2200g cyclohexane and 135g butadiene to a 5L batch polymerization reactor equipped with an anchor stirrer in sequence, start stirring, heat the circulating water bath to 60°C, and add 2.7mL of n-butyllithium solution initiated the polymerization reaction, reacted at 70°C for 30min (monomer conversion rate above 99% by weight), and obtained the first polymerization mixed liquid containing butadiene homopolymerization segment.

[0132] (2) Add 5.4 mL of a hexane solution of divinylbenzene into the reactor, and react at 60° C. for 30 min to obtain a second polymerization mixture.

[0133] (3) Add 2.9mL THF and 1.8mL t-AmOK hexane solution in the reactor, then add 292g butadiene and styrene mixed monomer (wherein, butadiene 219g, styrene 73g, adopt butyllithium solution out of the kettle); polymerization at 70° C. for 80 minutes (monomer conversion rate above 99% by weight) to obtain the third polymerization mixed liquid...

Embodiment 3

[0137] (1) Add 2200g of cyclohexane, 0.2mL of tetrahydrofuran and 147g of butadiene to a 5L batch polymerization reactor equipped with an anchor stirrer under the protection of high-purity nitrogen, start stirring, and heat to 60°C in a circulating water bath. Add 2.3mL of n-butyllithium solution into the reactor to initiate the polymerization reaction, and react at 70° C. for 30 minutes (monomer conversion rate is above 99% by weight), to obtain the first polymerization mixed liquid containing butadiene homopolymerization segment.

[0138] (2) Add 4.6 mL of a hexane solution of divinylbenzene into the reactor, and react at 70° C. for 30 min to obtain a second polymerization mixture.

[0139] (3) Add 2.3mL THF and 1.9mL sodium dodecylbenzenesulfonate (SDBS) hexane solution (concentration is 0.3M, purchased from Bailingwei Reagent Company, the same below) in the reactor, then add 226g butadiene Mix monomers with styrene (among them, butadiene 170g, styrene 56g, use butyllithium...

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Abstract

The invention discloses a block copolymer, a composition and a preparation method thereof, a vulcanized rubber and applications thereof, a tread rubber and a tire. According to the invention, the block copolymer contains an LCBR block, an SSBR1 block and an SSBR2 block, wherein the content of vinyl in the LCBR block is low, the content of vinyl and the content of styrene in the SSBR1 block are moderate, and the content of vinyl and the content of styrene in the SSBR2 block are high; the block copolymer further comprises a connecting unit derived from a compound represented by a formula I, wherein part of the SSBR1 block is connected with the LCBR block through the connecting unit, the rest SSBR1 block is directly connected with the LCBR block, and at least part of the SSBR2 block is directly connected with the SSBR1 block; the copolymer rubber can obtain favorable wet skid resistance, obviously lowers the rolling resistance, has favorable comprehensive physical and mechanical properties, and is especially suitable to be used as tread rubber of tires; and the formula I is CH2=CH-R1-CH=CH2.

Description

technical field [0001] The present invention relates to a block copolymer and a preparation method thereof. The present invention also relates to a composition containing the block copolymer and a vulcanized rubber formed from the block copolymer or the composition. The present invention further relates to the The block copolymer, the block copolymer composition and the application of the vulcanized rubber, the present invention also relates to a tire tread and a tire. Background technique [0002] Reducing energy consumption is the long-term goal of the development of the automobile industry, and reducing the rolling resistance of tires has become the top priority, but at the same time, other important performances of tires such as wet skid resistance, safety, wear resistance and durability are more comprehensively required . [0003] The comprehensive performance of rubber is generally characterized by loss factor (tanδ), which can more accurately describe the viscoelasti...

Claims

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Application Information

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IPC IPC(8): C08F297/04C08F236/06C08F212/36C08F212/08C08K5/375B60C1/00
CPCB60C1/0016C08F212/08C08F212/36C08F236/06C08F297/048C08K5/375Y02T10/86
Inventor 李建成赵姜维孙伟唐正伟
Owner CHINA PETROLEUM & CHEM CORP
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