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Hydrogenated styrene-butadiene block copolymer as well as preparation method and application thereof

A technology for hydrogenating styrene and block copolymers, applied in the field of copolymers, can solve the problems of cumbersome preparation methods, the degree of hydrogenation needs to be further improved, environmental hazards, etc., and can simplify the preparation process, increase the contact area, and improve the processing capacity. The effect of hydrogen

Active Publication Date: 2021-08-20
广东众和高新科技股份公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation method provided by the invention is relatively cumbersome, and uses a restricted substance such as methyl o-toluate, which causes certain harm to the environment, and the hydrogenation degree of the product needs to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The present embodiment provides a kind of preparation method of hydrogenated styrene-butadiene block copolymer, and described preparation method comprises the following steps:

[0043] (1) In the polymerization kettle, use a three-stage polymerization reaction with an initiation temperature of 60 ° C to prepare a base rubber with a solid content of 12 wt % and a molecular weight of 120,000. The obtained base rubber is transferred to a hydrogenation tank and then hydrogen gas is introduced to terminate the polymerization reaction The three-stage polymerization reaction is specifically: adding styrene and n-butyllithium to the system of cyclohexane to carry out the first stage polymerization reaction; after the first stage polymerization reaction is completed, add butadiene to the system to carry out The second stage polymerization reaction; after the second stage polymerization reaction is finished, add styrene in the system, carry out the third stage polymerization react...

Embodiment 2

[0048] The present embodiment provides a kind of preparation method of hydrogenated styrene-butadiene block copolymer, and described preparation method comprises the following steps:

[0049] (1) In the polymerization kettle, use a three-stage polymerization reaction with an initiation temperature of 58°C to prepare a base rubber with a solid content of 10 wt% and a molecular weight of 100,000. The obtained base rubber is transferred to a hydrogenation tank and then hydrogen gas is introduced to terminate the polymerization reaction The three-stage polymerization reaction is specifically: adding styrene and sec-butyllithium to the system of n-hexane to carry out the first stage polymerization reaction; after the first stage polymerization reaction is completed, add butadiene to the system to carry out The second stage polymerization reaction; after the second stage polymerization reaction is finished, add styrene in the system, carry out the third stage polymerization reaction;...

Embodiment 3

[0054] The present embodiment provides a kind of preparation method of hydrogenated styrene-butadiene block copolymer, and described preparation method comprises the following steps:

[0055] (1) In the polymerization kettle, use a three-stage polymerization reaction with an initiation temperature of 62°C to prepare a base glue with a solid content of 14wt% and a molecular weight of 180,000. The obtained base glue is transferred to a hydrogenation kettle and then hydrogen gas is introduced to terminate the polymerization reaction The three-stage polymerization reaction is specifically: adding styrene and n-butyllithium to the system of n-hexane to perform the first stage polymerization reaction; after the first stage polymerization reaction is completed, add butadiene to the system to carry out the second stage polymerization reaction Two-stage polymerization reaction; after the second-stage polymerization reaction is completed, styrene is added to the system to carry out the t...

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PUM

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Abstract

The invention provides a hydrogenated styrene-butadiene block copolymer as well as a preparation method and application thereof. the preparation method comprises the following steps: (1) preparing base rubber by utilizing a three-stage polymerization reaction, and then introducing hydrogen to terminate the polymerization reaction; (2) mixing titanocene dichloride and n-butyllithium, and carrying out aging reaction to obtain a hydrogenation catalyst; and (3) mixing the base rubber obtained in the step (1) and the hydrogenation catalyst obtained in the step (2), and introducing hydrogen to carry out hydrogenation reaction to prepare the hydrogenated styrene-butadiene block copolymer with the hydrogenation degree of greater than or equal to 98%, wherein the step (1) and the step (2) are in no order, and recycling hydrogen is adopted in the later stage of the hydrogenation reaction in the step (3). According to the preparation method provided by the invention, the use of cocatalyst o-benzoate is avoided in the hydrogenation process, and recycle hydrogen is adopted in the later stage of the hydrogenation reaction, so that the contact area of the hydrogenation catalyst and hydrogen is increased, the hydrogenation degree of the obtained product is improved, and meanwhile, the preparation process is simplified.

Description

technical field [0001] The invention belongs to the technical field of copolymers and relates to a hydrogenated styrene-butadiene block copolymer, in particular to a hydrogenated styrene-butadiene block copolymer and its preparation method and application. Background technique [0002] Hydrogenated styrene-butadiene block copolymer (SEBS) is a new type of thermoplastic elastomer prepared by selective hydrogenation of unsaturated double bonds in styrene-butadiene block copolymer (SBS). After hydrotreatment, the unsaturated double bonds in the molecular chain of SEBS products are greatly reduced, and the performance is significantly improved compared with SBS. SEBS not only has the thermoplasticity of SBS, but also has the high elasticity of rubber at room temperature. It shows the fluidity of resin at high temperature and can be processed directly. The high saturation of the main chain of SEBS makes it have better stability, heat resistance, oxidation resistance, weather res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/04C08F8/04
CPCC08F8/04C08F297/04
Inventor 黎广贞谢宝东杨寿盛郑岩张海涛李才亮王平舒畅刘敏张先汉袁兴有车国桥严莹珞
Owner 广东众和高新科技股份公司