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Drepn process of polyvinyl chloride resin with composite dispersant system

A technology of composite dispersion system and polyvinyl chloride resin, applied in the field of polyvinyl chloride resin production, can solve the problems of poor plasticizing performance and high residual amount of vinyl chloride monomer

Inactive Publication Date: 2002-08-07
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using the composite dispersion system of the present invention to prepare polyvinyl chloride resin, it can overcome the defects of high residual vinyl chloride monomer and poor plasticizing performance in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～4

[0022] The reaction temperature, reaction pressure and reaction time are the same as in Comparative Example 1, the weight ratio of vinyl chloride monomer and composite dispersion system is 1:0.00050, and the composite dispersion system with different ratios is used to carry out the polyvinyl chloride resin polymerization reaction, comparative example and implementation The used ratio of the example is shown in Table 1 below:

[0023] Table 1 Basic formula of composite dispersion system

[0024] The resin quality analysis results obtained in Examples 1 to 4 and Comparative Example 1 are compared, as shown in Table 2 below:

[0025] Comparative example 1

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PUM

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Abstract

The method for preparing polyvinyl chloride resin by adopting composite dispersion system includes the following steps: adding vinyl chloride monomer and composite dispersion system into polymerization reactor, and making them produce polymerization reaction under the condition of conventional polymerization. The composition and weight ratio of said composition dispersion system are IB:IC:ID=1:0.60-0.70:0.17-0.42, in which IB is polyvinyl alcohol, IC is hydroxypropyl methyl cellulose and IC is PVA with low alcohol-solubility, for example one of LM-22 and LW-300.

Description

technical field [0001] The invention relates to the field of polyvinyl chloride resin production, in particular to a method for preparing polyvinyl chloride resin by using a composite dispersion system. Background technique [0002] In the production of polyvinyl chloride resin, in order to obtain higher quality polyvinyl chloride resin products, for example, the residual amount of vinyl chloride monomer is ≤0.4μg / g, and the resin is required to have excellent plasticizing properties, it is necessary to improve the dispersion system. Most of the existing dispersion systems use a mixture of polyvinyl alcohol and hydroxypropyl methylcellulose, such as a dispersion composed of KH20 (polyvinyl alcohol produced by Japan Synthetic Chemicals Corporation) and hydroxypropyl methylcellulose (HPMC for short). system, its weight ratio KH20:HPMC=1:0.68, the residual amount of vinyl chloride monomer in the obtained polyvinyl chloride resin is relatively high, and the plasticizing performa...

Claims

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Application Information

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IPC IPC(8): C08F2/16C08F214/06
Inventor 顾水林陈江王林造高卫平唐亮吴瑞良张利明平建忠唐红沈龙施宏标
Owner SHANGHAI CHLOR ALKALI CHEM