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High molecular weight processing modifier for polyvinyl chloride low-foaming pipe

A processing modifier, the technology of polyvinyl chloride, is applied in the field of processing modifier for low-foaming polyvinyl chloride materials, which can solve the problem of affecting the appearance of products, poor fluidity of PVC mixture, and poor low-foaming materials. Ideal and other problems, to achieve the effect of reducing melting pulsation, dense and uniform pore structure, and reducing foaming density

Inactive Publication Date: 2008-06-04
SHANDONG RUIFENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the current processing aids is that the fluidity of the PVC compound is still not very good, which affects the appearance of the product. The density of the obtained material is generally 0.8-1.0g / cm 3 , not ideal for low foaming materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment 1: According to the above preparation process, the total amount of polymerized monomer mixture is 100%, and the first, second, third and fourth stages respectively account for 25%. The ratio of each monomer in the polymerized monomer mixture is: MMA12%, ST66%, AN22%. The addition amount of the chain extender divinylbenzene is 0.01% of the total weight of the polymerized monomers.

[0014] The intrinsic viscosity of the product is: 8.0.

Embodiment 2

[0015] Embodiment 2: According to the above preparation process, the total amount of polymerized monomer mixture is 100%, and the first, second, third and fourth stages respectively account for 25%. The ratio of each monomer in the polymerized monomer mixture is: MMA20%, ST60%, AN20%. The addition amount of the chain extender divinylbenzene is 0.03% of the total weight of the polymerized monomers.

[0016] The intrinsic viscosity of the product is: 8.5.

Embodiment 3

[0017] Embodiment 3: According to the above preparation process, the total amount of polymerized monomer mixture is 100%, and the first, second, third and fourth stages respectively account for 25%. The ratio of each monomer in the polymerized monomer mixture is: MMA40%, ST45%, AN15%. The added amount of the chain extender divinylbenzene is 0.05% of the total weight of the polymerized monomers.

[0018] The intrinsic viscosity of the product is: 8.6.

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PUM

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Abstract

The invention relates to high molecular processing modifier used in a polyvinyl chloride low foaming tube, which is characterized in that: the total weight of polymeric monomer is calculated as 100 percent, which comprises 12-72 percent of methyl methacrylate, 21-66 percent of styrene and 7-22 percent of acrylonitrile. Chain extender is added into the compositions to carry out emulsion polymerization in redox system. The invention is characterized in that: the invention can improve plasticizing and the plasticizing can become more even, can improve melt strength to promote extending property, can improve surface quality to reduce melting pulsation and increase surface gloss and can improve processing property to reduce blooming and crazing, decrease the foaming density of the product and increase elongation and pulling speed. Because of higher relative molecular mass, the invention can greatly improve the melt strength. The invention is used for producing PVC foaming products which have dense and even stomata structure and lower density.

Description

technical field [0001] The invention belongs to a processing modifier for polyvinyl chloride low-foaming materials. Background technique [0002] Processing modifier is an improving additive developed for the poor processing performance of PVC. The difficult-to-process characteristics of PVC are manifested in high melt viscosity and poor fluidity; poor melt thermal strength, low adhesion between resins, prone to melt fracture, and poor product appearance. Various defects in PVC processing can be well overcome by using processing aids. The problem with the current processing aids is that the fluidity of the PVC compound is still not very good, which affects the appearance of the product. The density of the obtained material is generally 0.8-1.0g / cm 3 , not ideal for low foaming materials. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a high-molecular-weight processing modifier for polyvinyl chloride low-foami...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08F220/14C08F2/22C08F212/10
Inventor 丁峰孙锋朱西堂周学伟
Owner SHANDONG RUIFENG CHEM
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