3. Development Status of Silicone Rubber Industry in China Since Dow Corning (DC) Company of the United States first realized the industrial production of organochlorosilane in 1943, after more than 50 years of development, a new situation of DC, GE, R-P, Wacker and Xinyue Company's top five in the international silicone market has been formed. There are more than ten large silicone professional companies in the world. The production scale of methyl chlorosilane is getting larger and larger. Various silicone oils and secondary processed products, silicone rubber, silicone resin, silane coupling agent, silane surfactant, etc. are widely used in various industrial departments. There are more than 5,000 varieties and specifications of silicone products, and the output and sales volume are increasing day by day. In the past 30 years, the growth rate of silicone industrial products has remained at 8% ~ 15%, far exceeding the growth rate of the national economy in general countries. At present, the application of silicone in our country has been very extensive. The quantity and variety of silicone continue to grow, and the application field continues to expand. Our country has become a potential market for silicone products.
(1): Due to the different industrial structures in different countries and regions, the high-rise structure of silicone is also different. For example, the silicone rubber in the United States accounts for 25 ~ 30% of the silicone market, Europe accounts for about 40%, and Japan accounts for more than 50%. Nearly half of them are thermally vulcanized silicone rubber, and the silicone rubber in China accounts for a larger proportion, about 60%. In our country, heat vulcanized silicone rubber is mainly used in the electronic and electrical industry, office automation equipment and automobile industry. With the development of national economy, the demand for heat vulcanized silicone rubber is increasing at a rate of not less than 20% per year. Hot vulcanized silicone rubber has complex production technology and high added value. In the world silicone market, its sales share is about 10%, and the sales amount is as high as 30 ~ 40%. The application of the heat vulcanized silicone rubber can be roughly divided into 35% of extruded products, 30% of molded products, 30% of wires and cables, 5% of coating materials, and the consumption growth rate is 4-6%. In developed countries, the scale and technology of production of hot vulcanized silicone rubber raw rubber and rubber blends have reached a high level. Dow Corning Company in the United States had a continuous polymerization unit of 1,000 tons as early as the early 1960s. In our country, * * units engaged in research and production of heat vulcanized silicone rubber are mainly Chenguang Chemical Research Institute and Jihua Research Institute, etc, * * sets of production units were built in 1960 with a production scale of 5t/a. Up to now, more than 40 rubber production units have been built in China with a total production capacity of nearly 80,000 tons. However, domestic silicone rubber manufacturers generally have problems such as low production efficiency, imperfect matching technology and less production of first-class and second-class compound. According to incomplete statistics, China's crude rubber production of hot vulcanized silicone rubber was over 40,000 tons in 2003, while China's actual consumption of rubber compounds was nearly 100,000 tons that year, and most of the high-quality rubber compounds were imported. At present, China's consumption of silicone rubber compounds exceeds 10% of the world's consumption. The fast growing application area of silicone rubber compounds is the production of key pads. The production plants are concentrated in Shenzhen, Xiamen, Nantong and other regions, and the key adhesive has become the * major user of hot vulcanized silicone rubber. Silicon rubber insulator and lightning arresters are the third generation products to replace porcelain, glass fiber reinforced plastic insulators and lightning arresters. They can be used in harsh climatic environment. Now they have been widely used in power transmission and transformation systems abroad. China has started to use them in developed coastal areas and has a very broad market prospect. The amount of sealant for automobiles made of silicone rubber reaches tens of thousands of tons in China, of which about 3,000 tons are thermally vulcanized silicone rubber, and the amount of silicone rubber will greatly increase with the improvement of the grade of automobiles. In addition, silicone rubber has a good application prospect in power cables, control cables for nuclear power plants, ships and the like, internal wiring for electronic machines, and lead-out wires for motors, color televisions and the like. In civil use, teats, thermos stoppers, pressure cooker gaskets and hoses for food vending machines made of hot vulcanized silicone rubber have been widely used. Some raw and mixed rubber have been exported to foreign countries. For example, the nipple mixed rubber from Chenguang Chemical Research Institute has been exported to Iran for several years in succession, which indicates that China's silicone rubber products have entered the international market. In the field of modern medicine, silicone rubber has been widely used in many important fields, such as making silicone rubber noise-proof earplugs, silicone rubber fetal head attractors, artificial blood vessels, tympanic membrane patches, artificial trachea, artificial lung, artificial bone, silicone rubber duodenum tube, etc., with ideal effects.
(2) Current Situation of RTV RTV: RTV is mainly used as adhesive sealant, potting material and mold. The category with large usage in total is sealant products (commonly known as "glass glue") applied in the construction and decoration market, mainly used for bonding and sealing requirements of new building forms such as glass curtain walls and high-rise buildings. In developed countries, the usage of silicone sealant has maintained an annual growth rate of more than 10% in recent years. According to statistics, the consumption of silicone sealant in China reached more than 50,000 tons in 2000 and is growing at an average annual rate of 20%-30%. The domestic market of silicone building sealant is mostly occupied by foreign Dow Corning Company and GE Company. In recent years, with the improvement of technical level and the expansion of market demand, silicone sealants's production has developed rapidly. Many enterprises have invested in building factories or expanding their scale, forming two major production bases in silicone sealants, Zhejiang and Guangdong. With the technical progress of the silicone industry, the quality of domestic silicone structural adhesive has been greatly improved. In addition, the price of domestic structural adhesive is much lower than that of imported adhesive, which makes domestic adhesive have excellent advantages in performance and price ratio. On the other hand, domestic manufacturers supply goods in a timely manner and can provide users with fast and considerate services. Domestic brands have achieved good results in recent years and won more and more users. The market share of domestic structural adhesives has increased from 10% a few years ago to more than 50%.