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Modified conjugated diene polymer and its preparation method and styrene-butadiene rubber

A conjugated diene and polymer technology, applied in the field of rubber modifiers, can solve the problems of reducing the cold flow of rubber, increasing the damping value, inapplicability, etc., and achieving the effect of good rubber storage stability

Active Publication Date: 2021-03-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Yin Jian etc. improve the storage properties of styrene-butadiene rubber by introducing a small amount of styrene blocks (determination of cold flow properties of random and end-block styrene-butadiene copolymers, synthetic rubber industry, volume 7, page 122). Although the method can significantly reduce the cold flow rate of rubber, the styrene block introduced by this method will phase separate from the main body of the rubber, which will increase the damping value in the high temperature region of the dynamic viscoelastic spectrum. The material is not suitable for use as a tire

Method used

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  • Modified conjugated diene polymer and its preparation method and styrene-butadiene rubber
  • Modified conjugated diene polymer and its preparation method and styrene-butadiene rubber
  • Modified conjugated diene polymer and its preparation method and styrene-butadiene rubber

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preparation example Construction

[0041] The present invention also provides a preparation method of a modified conjugated diene polymer, the method comprising:

[0042] (1) Under an inert atmosphere, in an organic solvent, and in the presence of an organolithium initiator, the conjugated diene is subjected to anionic polymerization;

[0043] (2) In the presence of a free radical initiator, the reaction product obtained in step (1) and a modifying agent are subjected to a contact reaction to obtain a modified conjugated diene polymer;

[0044] Wherein, the modifying agent is selected from formula (2) One or more mercapto-containing compounds in HS-R-OH and HS-R-COOH, R 1 -R 3 each independently for C 1 -C 10 Alkyl and C 1 -C 10 The alkoxyl group, R 4 for C 1 -C 20 Alkylene; R is C 1 -C 10 Alkylene, C 3 -C 10 Cycloalkylene, C 6 -C 12 the arylene group;

[0045] The conjugated diene is selected from C 4 -C 8 Conjugated dienes;

[0046] The number average molecular weight of the modified conju...

preparation example 1

[0085] Under the protection of high-purity nitrogen, 2300g of cyclohexane, 62.4g of styrene and 249.6g of butadiene were mixed, then 1250mg of tetrahydrofurfuryl alcohol ethyl ether was added, and 115mg of n-butyllithium was added at 50°C to initiate, and at 50 React at ℃ for 60 minutes. After the end, take half of the weight of the glue as the base liquid of styrene-butadiene rubber A1, and the remaining glue is condensed by water vapor to obtain the styrene-butadiene rubber sample B1.

preparation example 2

[0087] Under the protection of high-purity nitrogen, mix 2300g of cyclohexane, 62.5g of styrene, 117.6g of isoprene and 127.9g of butadiene, then add 700mg of tetrahydrofurfuryl butyl ether, and add 164mg of n- Initiated by butyllithium, react at 60°C for 60 minutes, then add 67mg of tin tetrachloride, react at 60°C for 20 minutes, after the end, take part of half the weight of the glue as the base liquid of styrene-butadiene rubber A2, and the remaining glue After the liquid was condensed by water vapor, the styrene-butadiene rubber sample B2 was obtained.

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Abstract

Relating to the field of rubber improving agents, the invention discloses a modified conjugated diene polymer, a preparation method and styrene butadiene rubber. The conjugated diene polymer containsa structural unit derived from conjugated diene, and also contains one or more sulfur-containing side groups selected from the group shown as formula (1), group -S-R-OH and group -S-R-COOH. The modified conjugated diene polymer acquired by the invention can lower the cold flow of rubber, especially styrene butadiene rubber, thus acquiring good rubber storage stability. Moreover, the mechanical performance and dynamic properties of rubber containing the modified conjugated diene polymer provided by the invention is free of adverse effect.

Description

technical field [0001] The invention relates to the field of rubber improvers, in particular to a modified conjugated diene polymer, a preparation method thereof and styrene-butadiene rubber. Background technique [0002] With the development of the automobile industry, the requirements for all aspects of rubber suitable for automobile tire tread rubber are getting higher and higher, not only must it have good wear resistance, but also have high wet skid resistance and low rolling resistance, so that In order to meet the needs of safe driving and energy saving. At the same time, higher requirements are put forward for the storage and transportation of rubber. The storage stability of rubber is characterized by the cold flow of rubber. In order to improve the cold flow performance of rubber, people have used different methods. Yin Jian etc. improve the storage properties of styrene-butadiene rubber by introducing a small amount of styrene blocks (determination of cold flow p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/10C08F212/08C08F8/42C08F8/34C08L9/06
Inventor 王妮妮刘辉康新贺孙文娟徐林王雪
Owner CHINA PETROLEUM & CHEM CORP
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