PVC pure resin is easy to decompose, has poor fluidity, low impact strength and poor weather resistance during processing, so it is necessary to add various auxiliary materials during the processing to improve its performance. Such as: lubricants, heat stabilizers, impact modifiers, processing aids, etc.

In the development and application of processing aids, they are roughly divided into the following categories according to product ingredients: methyl methacrylate (MMA)/acrylate copolymer, MMA/styrene copolymer, acrylonitrile/styrene, etc. At present, the largest amount of use and the best effect is MMA/acrylate copolymer.

Overview

PVC is one of the world's five major general-purpose plastics. In recent years, with the rapid development of China's national economy, PVC products have increased at a rate of more than 20% per year. By 2005, the annual output of PVC has reached 7.5 million tons. It is predicted that the demand for PVC will exceed 10 million tons by 2007.

Detailed Introduction

Processing aids were first successfully developed abroad by Rohm and Haas Company of the United States in 1958, and the first brand K-120 was launched in the same year. Since then, many foreign companies have begun to get involved in this field and developed similar products. After the 1970s, with the rapid growth of PVC products, processing aids have been widely used. At present, the main foreign manufacturers and related products include the P series of Japan's Mitsubishi (MITSUBSHI ROYAL), the PA series of Kaneka Chemical (KANEKA), the K series of the American Rohm and Haas Company, the F series of Germany's Bear, the P series of ATOFINA, and the PA series of South Korea's LG Chemical.

Product brands of famous foreign companies

Beijing Chemical Research Institute, Shanxi Chemical Research Institute, etc. were the first to engage in the research of PVC processing aids in China. Shanghai Coral Chemical Plant first realized industrialized production in the early 1980s, and the brands launched were collectively called ACR201 and ACR401 in China. In the late 1990s, with the development of China's polyvinyl chloride industry, especially the rapid development of plastic profiles and plastic pipe industries, the demand for processing aids has also increased rapidly. At present, Shandong ranks first in production, followed by Jiangsu and Zhejiang. According to incomplete statistics, in 2005, the country produced about 50,000 tons of various PVC processing aids, of which Shandong Province accounted for more than 70% of the total national production of additives.

Major manufacturers in China

China's research on impact-resistant MBS began in the late 1980s, and it was not until the mid-1990s that industrial production was achieved in Qilu Petrochemical and Shanghai Pen Factory. After more than a decade of development, there are now more than a dozen factories producing MBS, with an annual production capacity of 40,000 tons and an actual output of 20,000 tons. At present, the product quality of China's MBS, especially the stability of the product, is far behind that of foreign products. The annual import volume is much larger than the domestic volume. In 2005, the import volume was about 55,000 tons.

List of Chinese MBS manufacturers

It is worth mentioning that Shandong Ruifeng's LS series impact modifiers were the first to achieve industrialized production in China. The current plant capacity has reached 10,000 tons. Its main brands are LS-21, 21, 51, 61, 50. Among them, the impact modifier LS-50 was launched on the market in early 2006. The product performance has reached the level of similar foreign products and has been exported to South Korea, Turkey, India, the United States and other countries.

Problems in the development of impact modifiers

Because MBS is affected by foreign technical barriers and impact ACR is affected by the low-priced CPE impact modifier, China's MBS and impact ACR have developed slowly, especially MBS resin, which has a large gap compared with foreign products. How to achieve technological breakthroughs and meet the challenges of foreign peers is a difficult problem facing impact modifier processing companies.

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