The CPVC independently developed by Shanghai Chlor-Alkali Chemical Co., Ltd. has achieved industrial production and is a significant product innovation. In polymer materials, chlorinated polyvinyl chloride is a relatively cost-effective product. If 1% of PVC is replaced by CPVC globally, then the amount will be hundreds of thousands of tons. Therefore, CPVC has a good market prospect.
After more than 50 years of development, CPVC has a variety of production methods in foreign countries. The products are diversified, serialized, and penetrate into multiple application areas. The market demand is increasing. The world production capacity increased from 30,000 tons in the 1980s to more than 100,000 tons. The CPVC manufacturers have also grown from the past few to the current dozens, of which the largest is the United States Goodrich Chemical Company. Due to the excellent price/performance ratio of CPVC, the company converted all its PVC resins to CPVC in 1993 and gradually expanded its production capacity to 70,000 tons.
The research of CPVC in our country started late. Until the 1990s, some domestic manufacturers used the aqueous phase method to produce CPVC resin one after another. However, the produced resin has not been able to reach the level of products of foreign companies and can not meet the high-end pipe, pipe fittings and other CPVC products. Processing requirements. Until now, the CPVC used in the production of these products has mainly relied on imports, and the imported CPVC has been mixed.
The production of CPVC resin is easy to do, but it is difficult to do it well. Not only should pay attention to the chlorination process, but also must start from the source—chlorinated special PVC resin; not only the importance of the chlorination degree, but also the uniformity of the microstructure of the product after chlorination and the rationality of the molecular structure, that is, Said that the production of CPVC is a systematic project.
In view of the problems in the development of domestic water phase method CPVC resin, Shanghai Chlor-Alkali Chemical Co., Ltd. uses its own advantages in PVC resin synthesis technology and talents, proceeding from the production of chlorinated special PVC resin, proceeding with chlorination technology and formulation and processing technology. breakthrough. After years of hard work, a set of research results with independent intellectual property rights has been formed and a 10,000-ton capacity device has been built. This not only meets the needs of some domestic markets, but also breaks the long-term monopoly of CPVC in the Chinese market.
The aqueous phase production of CPVC has the advantages of simple process flow, easy control of reaction, low production cost, and suitability for industrial production. In the production process, there is less environmental pollution and no "three wastes" emissions, in line with the concept of green chemistry. In the choice of production companies, chlor-alkali enterprises have innate favorable conditions and can rely on the advantages of PVC to produce chlorinated special PVC resins. At the same time, CPVC is the downstream product of chlor-alkali plant to eat “chlorine”, which can give full play to the production capacity of caustic soda equipment, achieve efficient use of resources and obtain high-quality products.
I think that in terms of polymer materials, there is no significant difference in the quality of general-purpose products between China and foreign countries, but there is a clear gap between high-end products and specialty products. It is hoped that leading domestic enterprises will assume the responsibility of developing and producing high-end materials and special materials. Through strengthening research and development, we will focus on the development of mixed ingredients and promote the development of new materials such as plastic alloys. It is also recommended that relevant state departments strengthen the protection of CPVC's independent intellectual property rights.
