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Process for preparing hydrogenated butadiene-styrene copolymer thermoplastic elastomer

A technology of styrene copolymer and hydrogenated butadiene is applied in the field of preparation of hydrogenated butadiene-styrene copolymer thermoplastic elastomer, which can solve the problems of serious crosslinking and many side reactions of products, and achieve hydrogenation yield Improve and avoid the effect of pollution problems for people and the environment

Inactive Publication Date: 2006-01-18
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this method is that there are many side reactions in the hydrogenation process, and the product crosslinking is serious.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment experiment example 1

[0043] Repeat the hydrogenation conditions and steps of comparative experimental example 1, except that copper sulfate is replaced with boric acid. The adding method is to mix 2.467 g (0.0399 mol) of boric acid pre-dissolved in water with aqueous hydrogen peroxide solution, then add it to a constant pressure funnel, add it dropwise to the reaction flask under stirring, and finish dropping in 6 hours. Get 10ml hydrogenated butadiene-styrene copolymer latex, pour into 1% calcium chloride aqueous solution to coagulate, and dry. The hydrogenation degree of the product was measured to be 83.3%, and the gel content was 7.2%.

Embodiment experiment example 2

[0045] Repeat the hydrogenation conditions and steps of comparative experimental example 2, except that copper sulfate is replaced with boric acid. Boric acid consumption is 3.5 grams (0.0566mol), and its adding method is after the aqueous solution of boric acid is mixed with hydrogen peroxide aqueous solution, joins in the constant pressure funnel, is added dropwise in the reaction flask under stirring, drips in 6 hours. Get 10ml hydrogenated butadiene-styrene copolymer latex, pour into 1% calcium chloride aqueous solution to coagulate, and dry. The degree of hydrogenation of the product was measured to be 93.5%, and the gel content was 6.8%.

Embodiment experiment example 3

[0047] With 125ml butadiene-styrene latex (its solid content 18.4% quality, styrene content 23.5%, containing C=C double bond 0.3258mol), 33.5ml concentration is 85% hydrazine hydrate (0.57mol), joins 1000ml Add a few drops of defoamer to the reaction flask. Stir the mixture evenly, heat to 50°C, then dissolve 0.0399mol of sodium borate in 15ml of water, mix it with 49.3ml (0.4785mol) of 30% hydrogen peroxide, add it to the constant pressure funnel, and slowly drop it into the reaction flask while stirring In the middle, the dripping is finished in 6 hours. Get 10ml hydrogenated butadiene-styrene copolymer latex, pour into 1% calcium chloride aqueous solution to coagulate, and dry. The hydrogenation degree of the product was measured to be 87.6%, and the gel content was 7.9%.

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Abstract

The present invention relates to preparation process of thermoplastic hydrogenated butadiene-styrene copolymer elastomer. The preparation process includes the reaction of butadiene-styrene copolymer emulsion, hydrazine, oxidant and catalyst in the presence or absence of water soluble gel inhibitor to prepare the hydrogenated butadiene-styrene copolymer. The product has the physical performance similar to sulfurized rubber and exhibits excellent heat ageing resistance.

Description

technical field [0001] The invention relates to a method for preparing a hydrogenated butadiene-styrene copolymer thermoplastic elastomer. The method comprises reacting butadiene-styrene copolymer latex with hydrazine, an oxidant and a catalyst in the presence or absence of a water-soluble gel inhibitor to prepare hydrogenated butadiene-styrene copolymer latex. The hydrogenated product has the physical properties of vulcanized rubber without vulcanization, and at the same time shows excellent heat aging resistance. Background technique [0002] Styrene-butadiene rubber is an important type of diene rubber that is widely used. Because its molecule contains double bonds, its heat resistance, ozone resistance, ultraviolet resistance and other properties are poor. Hydrogenation is an important way to make unsaturated polymers obtain monomer sequence structures that cannot be obtained by traditional polymerization methods, and then obtain excellent physical properties. Hydroge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/04C08F236/10
Inventor 白华栋李少毅周淑芹
Owner BEIJING UNIV OF CHEM TECH
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