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Preparation method of star branched polyisobutylene or butyl rubber

A technology of polyisobutylene and butyl rubber, which is applied in the field of polymer block copolymerization and can solve problems such as swelling phenomenon

Active Publication Date: 2012-02-08
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to obtain a balance between the two, one of the methods is to broaden the relative molecular mass distribution of butyl rubber, and simple physical mixing of high molecular weight and low molecular weight polymers can broaden the molecular weight distribution, but It will also bring other processing problems, such as large swelling after flowing out of the forming die, etc.

Method used

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  • Preparation method of star branched polyisobutylene or butyl rubber
  • Preparation method of star branched polyisobutylene or butyl rubber
  • Preparation method of star branched polyisobutylene or butyl rubber

Examples

Experimental program
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Embodiment 1

[0023] This experiment is a comparative experiment, comparing the star-branched butyl rubber prepared without adding the above-mentioned polystyrene-isoprene silicon-chloride block copolymer and adding polystyrene-isoprene silicon-chloride block copolymer .

[0024] Polymer bottle 1 # No added polystyrene-isoprene silyl chloride block copolymer, 2 # Add 0.0568 grams of polystyrene-isoprene silicon-chloride block copolymer (relative to 4% of the monomer mass,) in the bottle, and add 10 ml Methyl chloride was dissolved in 10ml cyclohexane. After the dissolution is complete, add 1ml 2-chloro-2,4,4-trimethylpentane TMPCl (0.002M), 0.5ml hexahydropyridine (0.004M) nucleophile and 1ml TiCl 4 (0.036M) co-initiator, aged for 5min, added a mixture of 2ml isobutene and 0.066ml isoprene, polymerized for 1h, precipitated with methanol, washed and dried. The products obtained are 1 # ,2 # . 2 # The molecular weight of the product increased significantly, the molecular weight distri...

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Abstract

The invention relates to a preparation method of star-shaped branched polyisobutylene or butyl rubber, which uses polystyrene / isoprene block copolymers containing silicon chloride groups at the end or polystyrene / isoprene block copolymers containing silicon chloride groups at the end. As the initiator-grafting agent of cationic polymerization, the diene block copolymer directly participates in cationic polymerisation; through the initiation of cationic polymerisation by silicon chloride group, the star-branched polymer is prepared by participating in the grafting reaction through unsaturated bonds. Isobutylene and butyl rubber products; the advantages of the present invention are: the synthesized branched polymer exhibits different processing properties from the original linear branched polymer molecule in terms of colloidal strength and stress relaxation balance, and has excellent performance, involving thermoplastic elasticity body more.

Description

technical field [0001] The present invention relates to the method for macromolecular block copolymerization, more specifically, relate to in cationic polymerization system, add the polystyrene / isoprene block copolymer containing silicon chloride group or the end contains silicon chloride group A method for preparing star-branched polyisobutylene or star-branched butyl rubber from polystyrene / butadiene block copolymer. Background technique [0002] Butyl rubber has good air tightness and excellent comprehensive performance, so they are important products in the tire industry. However, butyl rubber (IIR) and its halogenated butyl rubber have problems such as processing difficulties. It is generally believed that the strength of raw rubber is related to molecular weight. The larger the molecular weight, the higher the strength of raw rubber. The stress relaxation rate is also a function of molecular weight. The increase in molecular weight will slow down the relaxation rate. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F297/00
Inventor 李树新郭文莉伍一波龚惠勤金玉顺商育伟吕占霞赵锦波
Owner CHINA PETROLEUM & CHEM CORP
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