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Method for producing ethylene-vinyl acetate copolymer chlorinated resin by acid phase process

A vinyl acetate copolymer resin, vinyl acetate technology, applied in the field of regular polypropylene, can solve the problems of dilute hydrochloric acid must be treated, the burden of three wastes treatment is heavy, the utilization rate of chlorine gas is low, etc. The effect of reducing and improving the anti-adhesion ability

Inactive Publication Date: 2009-03-18
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although the aqueous phase suspension chlorination method has a simple synthesis process and low cost, it produces a large amount of dilute hydrochloric acid with a concentration of less than 6% in the production process, which cannot be used, and the utilization rate of chlorine gas is low; and the dilute hydrochloric acid must be treated. heavy burden
The acid phase suspension chlorination method has been applied in the synthesis of chlorinated polyethylene, such as (US4652224, JP72-07455), and the production of chlorinated EVA by the method acid phase suspension chlorination has not yet been reported

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] In an acid-resistant enamel reaction kettle with a nominal volume of 50L and a stirrer, add 50kg of hydrochloric acid with a concentration of 20%, the melt index is 150g / 10min, the content of vinyl acetate is 28%, and the particle size is 40-80 mesh. Ethylene-vinyl acetate copolymerization (EVA) resin 5kg, castor oil-polyoxyethylene ether 20g, polyvinylpyrrolidone 100g, talcum powder 50g, lauryl peroxide 25g, stir for 20min to make it evenly mixed, then raise the temperature to make the material temperature reach 45 ℃, pass into The air was replaced with nitrogen for 10 minutes, and chlorine gas was introduced to react, so that the reaction temperature was gradually increased. At the end of the reaction, the reaction temperature was controlled to be 75° C., and the amount of chlorine gas introduced was 1.2 times the mass of ethylene-vinyl acetate copolymer resin (EVA). Keep warm for 0.5h, then lower the temperature to 55°C, and replace residual chlorine with nitrogen for...

Embodiment 2

[0014] In an acid-resistant enamel reaction kettle with a nominal volume of 50L and a stirrer, add 50kg of hydrochloric acid with a concentration of 20%, the melt index is 250g / 10min, the content of vinyl acetate is 28%, and the particle size is 40-80 mesh. Ethylene-vinyl acetate copolymerization (EVA) resin 5kg, sodium dodecylbenzenesulfonate 5g, polyvinylpyrrolidone 50g, lauryl peroxide 15g, stir for 20min to make it evenly mixed, then raise the temperature to make the temperature of the material reach 45°C, and replace the air with nitrogen For 10 minutes, chlorine gas was introduced to react, and the reaction temperature was gradually increased. At the end of the reaction, the reaction temperature was controlled to be 70° C., and the amount of chlorine gas introduced was 1 times the mass of ethylene-vinyl acetate copolymer (EVA) resin. All the other materials were processed according to the operation of Example 1 to obtain a chlorinated ethylene-vinyl acetate copolymer (EVA...

Embodiment 3

[0016] In an acid-resistant enamel reaction kettle with a nominal volume of 50L and a stirrer, add 50kg of hydrochloric acid with a concentration of 20%, the melt index is 150g / 10min, the content of vinyl acetate is 28%, and the particle size is 40-80 mesh. Ethylene-vinyl acetate copolymerization (EVA) resin 5kg, nonylphenol polyoxyethylene ether 25g, polyvinylpyrrolidone 100g, azobisisoheptanonitrile 25g, stir for 20min to make it evenly mixed, then raise the temperature to make the material temperature reach 45°C, and replace the air with nitrogen For 10 minutes, chlorine gas was introduced to react, and the reaction temperature was gradually increased. At the end of the reaction, the reaction temperature was controlled to be 85° C., and the amount of chlorine gas introduced was 1.4 times the mass of ethylene-vinyl acetate copolymer (EVA) resin. The rest were processed according to the operation of Example 1 to obtain chlorinated ethylene-vinyl acetate copolymer (EVA) resin w...

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Abstract

The invention relates to acid phase method ethane-vinyl acetate copolymer chlorinated resin manufacturing method. Its features are that using 20% hydrochloric acid as dispersion medium to chlorinate EVA resin powder at suspended state, then processing de-acidification, neutralizing, centrifuge, washing, drying to produce chlorinated EVA resin. The invention can increase chlorination reaction speed, improve dispersion state for chlorinated EVA resin powder, increase anti-glutinous performance for the powder particle, additionally produce about 25% industry hydrochloric acid to reduce treated waste dilute hydrochloric acid quantity. Thus it can reduce production cost, the three wastes discharge amount, technique water consumption, and be good for protecting the environment.

Description

technical field [0001] The present invention relates to a method for producing chlorinated isotactic polypropylene in a suspended state by using hydrochloric acid with a concentration of 20% as a reaction medium. Background technique [0002] Ethylene-vinyl acetate copolymer resin (EVA resin) is a thermoplastic copolymer resin formed by high-pressure bulk polymerization of ethylene monomer and vinyl acetate monomer in the presence of an initiator; chlorine atoms are introduced into the molecular structure of EVA resin, that is, to The resin obtained after chlorination modification of EVA is chlorinated EVA. Chlorinated EVA is a high-performance polymer material with excellent aging resistance and ozone resistance, especially excellent dissolution and film-forming properties. It is widely used in printing, packaging, coatings and adhesives and other fields. The production methods of chlorinated EVA include solution chlorination and suspension chlorination using carbon tetrac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/02C08F8/18C08F218/08
Inventor 宋秋生
Owner HEFEI UNIV OF TECH
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