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Preparation method of special PVC resin for CPVC

A technology of polyvinyl chloride resin and chlorinated polyvinyl chloride, applied in the field of preparation of polyvinyl chloride resin, can solve the problems of film thickness, low porosity, poor plasticizing performance, etc., achieve stable polymerization reaction, improve internal quality, Good quality repeatability

Inactive Publication Date: 2015-12-30
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a method for manufacturing polyvinyl chloride resin special for chlorinated polyvinyl chloride, so as to overcome the problems of low porosity, poor plasticizing performance and thick film of polyvinyl chloride resin existing in the prior art. defect

Method used

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  • Preparation method of special PVC resin for CPVC
  • Preparation method of special PVC resin for CPVC
  • Preparation method of special PVC resin for CPVC

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add water, main dispersant, auxiliary dispersant, vinyl chloride monomer, anti-fisheye agent tert-butyl hydroquinone and initiator into the polymerization reactor, the reaction temperature is 56.8°C, after 5 hours of polymerization, Add a terminator and an antioxidant to obtain a special PVC resin for polyCPVC chlorination.

[0028] Its parts by weight are:

[0029]

[0030] The main dispersant is a mixture of polyvinyl alcohol (KH20) produced by Japan Synthetic Chemical Company and hydroxypropyl methylcellulose HPMC (E50) produced by U.S. Dow Chemical Company, and the weight ratio is 1: 0.7;

[0031] The auxiliary dispersant is low alcoholysis polyvinyl alcohol (LM22) produced by Japan Kuraray Chemical Co.

[0032] The initiator bis(2-ethyl)hexyl peroxydicarbonate is referred to as EHP, and TX-99 (cumyl peroxy neodecanoate) or TX-36 (oxidized bis(3,5,5-trimethyl ) hexanoyl) or more; the anti-fisheye agent is tert-butylhydroquinone, and the antioxidant is EB44-34 (...

Embodiment 2

[0035] Adopt the method identical with embodiment 1, wherein: temperature of reaction is 60 ℃, and the reaction time is 4 hours;

[0036]

[0037] Using GB / T15595 standard to test, the porosity of polyvinyl chloride resin products is significantly improved, the oil absorption rate of plasticizers can reach more than 30, and the particle size distribution of resin particles is relatively concentrated.

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Abstract

The invention discloses a preparation method of special PVC resin for CPVC. The method includes the steps that water, a main dispersing agent, an assistant dispersing agent, a surface active agent, VCM, an initiating agent, an anti-fisheye agent and a pH regulating agent are added into a reaction kettle to be subjected to a polymerization reaction for 4.5-5.5 h at 50-65 DEG C, and then a terminator and an antioxidant are added into the reaction system at the same time to obtain the special PVC resin for CPVC. According to the special PVC resin, prepared through the method, for CPVC chlorination, the particle size distribution width of the resin is reduced, the particle shape of the resin is regular, and the inherent quality of the resin is improved. The polymerization reaction is stable in the production process, the quality repeatability of all batches of resin is good, and therefore the novel assistant compound preparation method can be applied to large kettle industrial production.

Description

technical field [0001] The present invention relates to the preparation method of polyvinyl chloride resin. Background technique [0002] Chlorinated polyvinyl chloride resin (CPVC), as a heat-resistant engineering plastic with excellent performance, has been widely used at home and abroad in extruding heat-resistant pipes, plates or injection-molded heat-resistant pipe fittings. In the manufacturing process of chlorinated PVC resin, in order to improve the processing fluidity and product performance of CPVC resin, in addition to improving the chlorination process and the level of chlorination technology, the selection of special PVC resin is also very important. The special PVC resin has high internal porosity, little or no skin on the resin particles, and good porosity of the resin. [0003] In the production of polyvinyl chloride resin, in order to obtain higher quality PVC resin for chlorination of CPVC, for example, the PVC resin for chlorination of CPVC is required to...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F2/38C08F2/00C08F8/20
Inventor 康文其崔巍张利明陆伟良陈勇董小攀
Owner SHANGHAI CHLOR ALKALI CHEM
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