PVC (polyvinyl chloride) processing aid and preparation method thereof

A technology of processing aids and initiators, applied in the field of PVC processing aids and their preparation, can solve the problems of rising ACR processing costs, unsuccessful application, poor thermal stability, etc., and achieves improved melt strength and surface finish, low price , Improve the effect of poor heat resistance

Active Publication Date: 2014-12-24
淄博华星助剂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] As the market continues to change, the price of acrylic monomers, raw materials for ACR resins, continues to rise, resulting in an increase in ACR processing costs, and at the same time bringing more and more cost pressures to downstream PVC manufacturers.
[0004] Vinyl acetate, as a cheap polymer monomer, has been increasingly used in the fields of synthetic adhesives, coatings, etc., but it is not easy to polymerize, poor thermal stability and other characteristics limit its use
Has not been successfully applied to the production of ACR processing aids

Method used

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  • PVC (polyvinyl chloride) processing aid and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The preparation method of described PVC processing aid, comprises the following steps:

[0035] (1) Add 300g deionized water, 0.5g diameter expander (trisodium phosphate), 2g emulsifier (sodium lauryl sulfate), 100g core layer comonomer (vinyl acetate and methyl acrylate) into the reactor Mixed at a mass ratio of 60:40), 0.2g initiator (potassium persulfate), heated to 65°C, and reacted for 4 hours under nitrogen protection to obtain a nuclear layer emulsion;

[0036] (2) in the core layer emulsion that step (1) obtains, add 2g emulsifier (sodium lauryl sulfate), 100g shell layer comonomer (styrene and acrylonitrile are mixed in 80:20 by mass ratio), Control the temperature at 65°C, add 0.3g initiator (potassium persulfate), and react under nitrogen protection for 4 hours. The reaction is divided into 5 stages. After the reaction is completed, the temperature is raised to 85°C, matured for 1 hour, filtered, and dried to obtain the product.

Embodiment 2

[0038] The preparation method of described PVC processing aid, comprises the following steps:

[0039] (1) Add 300g deionized water, 0.8g diameter expander (sodium sulfate), 3g emulsifier (sodium dodecylbenzenesulfonate), 100g core layer comonomer (vinyl acetate and methyl acrylate) to the reactor Esters are mixed at a mass ratio of 80:20), 0.1g initiator (ammonium persulfate), heated to 60°C, and reacted for 3 hours under nitrogen protection to obtain a nuclear layer emulsion;

[0040] (2) In the core layer emulsion obtained in step (1), add 3g emulsifier (sodium dodecylbenzenesulfonate), 160g shell layer comonomer (styrene and acrylonitrile are mixed in a mass ratio of 75:25 ), control the temperature at 75°C, add 0.5g initiator (AIBN), and react under nitrogen protection for 3 hours. The reaction is divided into 4 stages. After the reaction is completed, the temperature is raised to 80°C, matured for 1 hour, filtered, and dried to obtain the product.

Embodiment 3

[0042] The preparation method of described PVC processing aid, comprises the following steps:

[0043] (1) Add 200g deionized water, 0.2g diameter expander (sodium chloride), 1g emulsifier (sodium dodecylbenzenesulfonate), 100g core layer comonomer (vinyl acetate and acrylic acid) to the reactor Methyl ester is mixed at a mass ratio of 75:25), 0.1g initiator (potassium persulfate and sodium bisulfite are mixed at a mass ratio of 1:1), the temperature is raised to 40°C, and the reaction is carried out under nitrogen protection for 4 hours to obtain a core layer emulsion ;

[0044] (2) In the core layer emulsion obtained in step (1), add 1g emulsifier (sodium dodecylbenzenesulfonate), 80g shell layer comonomer (styrene and acrylonitrile are mixed in a mass ratio of 70:30 ), control the temperature at 65°C, add 0.1g initiator (potassium persulfate), and react for 5 hours under the protection of nitrogen. .

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Abstract

The invention belongs to the technical field of high-molecular compound compositions and in particular relates to a PVC (polyvinyl chloride) processing aid. The PVC processing aid is vinyl acetate-methyl acrylate-styrene-acrylonitrile quaternary core-shell graft copolymer. The invention provides a preparation method of the PVC processing aid; the preparation method comprises the following steps: adding de-ionized water, an expanding agent, an emulsifying agent, core-layer comonomers (vinyl acetate and methyl acrylate) and an initiating agent into a reactor, and reacting to obtain core-layer emulsion; adding the emulsifying agent and shell-layer comonomers (styrene and acrylonitrile) into the obtained core-layer emulsion, adding the initiating agent for reaction, and after the reaction is finished, curing, filtering and drying to obtain the PVC processing aid. According to the PVC processing aid, the defects of difficult polymerization and low conversion rate of the vinyl acetate are overcome, the vinyl acetate is successfully applied to the polymerization of ACR products, and the production cost is reduced; the PVC processing aid is relatively high in plasticizing performance, thermal stability, melt strength and product surface smoothness; the preparation method provided by the invention is simple and reasonable in process.

Description

technical field [0001] The invention belongs to the technical field of polymer compound compositions, and in particular relates to a PVC processing aid and a preparation method thereof. Background technique [0002] Polyvinyl chloride ((PVC) is an important synthetic material with a wide range of uses, large output and excellent performance. But it has the disadvantages of low melt strength, poor fluidity, processing temperature and PVC decomposition temperature, which are difficult to process. In order to solve these Problems, processing aid ACR came into being. ACR is a general term for acrylate copolymers, which can promote the plasticization of PVC, improve fluidity and melt strength. [0003] With the continuous changes in the market, the price of acrylic monomers, the raw materials of ACR resin, continues to rise, resulting in an increase in ACR processing costs, and at the same time bringing more and more cost pressures to downstream PVC manufacturers. [0004] Vinyl...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08L51/00C08F263/04C08F218/08C08F220/14C08F212/10C08F220/44
Inventor 王敬刚孔凡高王美红徐建光王玉萍孙军伟
Owner 淄博华星助剂有限公司
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