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Prepn process of emulsive interpenetrating thermoplastic elastomer

A thermoplastic elastomer and interpenetrating network technology, which is applied in the field of emulsion polymerization to synthesize interpenetrating network thermoplastic elastomers, can solve the problems of low efficiency, low efficiency of crosslinking agent, loss of control of crosslinking density, etc., and achieve crosslinking High efficiency, satisfying repeated processing, and maintaining structural stability

Inactive Publication Date: 2004-11-24
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method selects 5% butadiene as crosslinking agent to synthesize acrylate elastomer seed emulsion, because the radical polymerization of butadiene has 1,2 polymerization and 1,4 polymerization difference, and only has the situation of 1,2 polymerization Therefore, the efficiency of this crosslinking agent is very low. Due to the low efficiency, in the process of elastomer synthesis, the crosslinking agent must be used in excess, which makes the crosslinking density of the seed polymer Loss of control, while the crosslink density has a direct relationship with the mechanical properties of the material

Method used

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  • Prepn process of emulsive interpenetrating thermoplastic elastomer
  • Prepn process of emulsive interpenetrating thermoplastic elastomer

Examples

Experimental program
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Embodiment 1

[0031] Add 5.0 g of emulsifier sodium alkyl sulfate (SDS) and 325 ml of deionized water into a 1000 ml three-port reactor, get 250 g of acrylate monomers containing triethylene glycol diacrylate (TEGDA) crosslinking agent, and crosslink The consumption of agent is 0.15% (molar ratio), drops among the reactor, after 20 minutes of passing nitrogen, in the reactor at 50 ℃, slowly add dropwise 0.175g ammonium persulfate and 0.175g sodium bisulfite solution simultaneously , dripping is completed within 1 hour, and then kept at 60°C for 2 hours, and the polymerization is stopped after the conversion rate is greater than 98%. After the solid content is measured, the material is discharged for use.

[0032] In a 1000ml three-port reactor, add 12.5g of seed I (calculated according to the solid content, about 38ml), add 200ml of deionized water, and at a uniform stirring speed, take 237g of the same monomer as the previous reaction, and drop it into the reactor Among them, while adding ...

Embodiment 2

[0035] Add 350ml of deionized water into a 1000ml three-port pressure reactor, add 5.0g of disproportionated abietate potassium and 3.0g of diffusing agent NF into the reactor, and take 250g of a mixture of butadiene and styrene, wherein the ratio of butylbenzene to styrene is 70 / 30 Between 95 / 5, 0.2% (molar ratio) of divinylbenzene (DVB) crosslinking agent is contained in the mixed monomer, drop into the reactor, at a uniform stirring speed, at about 5 ° C , Utilize 0.3 gram of cumene hydroperoxide, 0.04 gram of ferrous sulfate, 0.1 gram of sodium ethylenediamine tetraacetate, 0.2 gram of carved white powder to initiate polymerization, and obtain micro-crosslinked styrene-butadiene rubber seed I emulsion.

[0036] In a 1000ml pressure vessel, weigh 18.8g of the above-mentioned Seed I emulsion (calculated according to the solid content, about 63ml), add 250ml of deionized water, and gradually add 170g of monomer dropwise under stirring, the monomer is completely the same as the...

Embodiment 3

[0040] Add 500 g of deionized water into a 1000 ml three-port high-pressure reactor, add emulsifiers in the reactor, these emulsifiers are potassium stearate 2.5 g, get the mixture of butadiene and acrylonitrile 125 g, wherein butadiene and propylene The ratio of nitrile is at 75 / 25 (weight ratio), wherein contains the divinylbenzene (DVB) linking agent of 0.2% (mol ratio) in the mixed monomer, drops among the reactor, under uniform stirring speed, At about 5°C, the polymerization was initiated by using the cumene hydroperoxide-ferrous sulfate-EDTA-glyphite redox initiation system to obtain a slightly cross-linked nitrile rubber seed I emulsion.

[0041] Add above-mentioned seed I emulsion 6.25g (according to solid content calculation, about 37.5ml) in 1000ml high-pressure reactor, add 500ml deionized water, get the same mixed monomer 118.75g of the previous step, drop in the reactor, and 0.875 g of potassium stearate aqueous solution was added dropwise to the monomer synchron...

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Abstract

The preparation process of emulsive interpenetrating thermoplastic elastomer includes synthesis of slightly cross-linked rubber elastomer seed emulsion, synthesis of interpenetrating emulsion, agglomeration, drying and mixing pelletizing. The synthesis of rubber elastomer seed emulsion includes two steps. Cross-linking vinyl monomer with certain bifunctional degree and multifunctional degree is mixed into the seed emulsion monomer and the consumption of cross-linking agent is controlled to obtain rubber elastomer seed emulsion with controlled and low cross-linking degree. Into the seed emulsion, thermoplastic vinyl monomer with mixed acrylonitrile is dropped while adding certain amount of emulsifier, and through swelling, initiating polymerization and other courses, the emulsive interpenetrating polymer with proper cross-linking degree is obtained, which is further processed into emulsive interpenetrating thermoplastic elastomer agglomerate.

Description

technical field [0001] The invention relates to a preparation method of a thermoplastic elastomer, in particular to a method for synthesizing an interpenetrating network thermoplastic elastomer by emulsion polymerization. Background technique [0002] Thermoplastic elastomer (TPE) is a kind of elastomer material that can realize thermoplastic processing. Due to this unique property, this elastomer material can be processed efficiently by using the equipment and methods for processing plastics, which greatly improves the processing and production of elastomer materials. Efficiency, and at the same time, it can be conveniently processed and reused, and it is an environmentally friendly material. [0003] At present, the main synthesis methods of thermoplastic elastomer materials are anionic polymerization method and dynamic blending vulcanization method. For example, SBS and SIS are block polymer thermoplastic elastomers prepared by living anionic polymerization. The thermopl...

Claims

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Application Information

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IPC IPC(8): C08F2/00C08F220/44
Inventor 李效玉董汉鹏
Owner BEIJING UNIV OF CHEM TECH
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