Pvc Processing Aid

Introduction to PVC processing aids
PVC processing aid is a chemical substance specifically used to improve the processing performance of polyvinyl chloride (PVC) plastic products. They play a crucial role in the production process of PVC plastic products, significantly improving product quality and production efficiency.
Definition and Function
PVC processing aids are multilayer ultra-high molecular weight polymers made of acrylate monomers through multi-stage lotion polymerization. Their main functions include:
Improving processing performance: By improving the flowability, thermal strength, and ductility of PVC melt, plasticization time and productivity can be increased.
Improve product quality: reduce mold expansion phenomenon, enhance resistance to elongation or stretching deformation, increase solution viscosity, and improve internal and surface quality.
Types and Applications
Common PVC processing aids include:
ACR: The best impact modifier developed in recent years, suitable for outdoor PVC plastic products, with good processing performance, smooth surface, and good aging resistance.
CPE: Chlorinated polyethylene, commonly used in the production of PVC pipes and profiles, with a dosage of 5-15 parts per square meter.
MBS: It has good compatibility with PVC and is commonly used in transparent products, but its price is relatively high and it is not suitable for long-term outdoor use.
ABS: The usual dosage is 5-20 parts, but it has poor weather resistance and is not suitable for long-term outdoor use.
EVA: Often used in combination with other impact resistant resins, but it is difficult to obtain transparent products.
History and Development
PVC processing aids were first developed by the American company Rohm and Haas in 1958, and similar products were subsequently developed by countries such as Japan, South Korea, and Germany. With the widespread application of PVC products, processing aids have been widely used since the 1970s.
Market and application areas
At present, the world's major manufacturers of PVC processing aids include Mitsubishi from Japan, Zhongyuan Chemical, Rohm and Haas from the United States, and Bear from Germany. The Beijing Institute of Chemical Technology and Shanxi Institute of Chemical Technology were among the earliest to engage in research on PVC processing aids in China. Shanghai Shanhu Chemical Plant was the first to achieve industrial production in the early 1980s.
In summary, PVC processing aids play an important role in the production of PVC plastic products, significantly improving production efficiency and product performance by improving processing performance and product quality.