In recent years, the global fluororubber has developed rapidly, and the annual growth rate of its output has been maintained at 7% - 8%. At present, China, the United States, Russia, Japan, Italy and other countries are mainly engaged in the production of fluororubber, with a total production capacity of nearly 40000 t / A and more than 50 varieties (including compound rubber), such as type 23 fluororubber, 26 Series fluororubber, fluorosilicone rubber, fluorinated phosphine nitrile rubber and fluoroether rubber. Among them, 26 Series (26, 246) fluororubber with large consumption and wide application range is 26 Series (26, 246), accounting for the total amount of fluororubber More than 90% of the dosage.
The automobile industry is the main consumption area of fluororubber, the consumption of which accounts for 40% of the total consumption of fluororubber, 25% of the total consumption of fluororubber, and 35% of the total consumption of fluororubber in aerospace, aviation and other industries. First, the growth of demand stimulates the increase of production.
China's fluororubber industry has developed rapidly (see Table 1 for production and marketing statistics in recent years), and has initially formed a production capacity of 3000t / A
The plant capacity of Zhonghao Chenguang Chemical Research Institute (hereinafter referred to as Chenguang Institute) is 1500t / A, Shanghai sanaifu Co., Ltd. is 1000t / A, and Jiangsu Meilan Chemical Co., Ltd. is 500t / A.
The traditional type 23, 26 and 246 fluororubber were the main varieties. Among them, type 23 glue produced by chenguangyuan is a company, 26 glue and 246 glue have complete varieties and specifications, and can produce low Mooney viscosity glue;
The application of fluororubber in automobile key parts, such as sealing gasket and O-ring, also promotes the application of fluororubber (especially high fluorine rubber with excellent comprehensive performance). The application of fluororubber in automobile industry in foreign countries has entered a mature stage. It is mainly used as sealing material for power transmission, vibration reduction and fuel system of cars and medium and high-grade automobiles. The average consumption of fluororubber per vehicle is 0.20-0.25kg.
At present, most of the fluororubber used in automobile industry in China is imported from Europe, and the annual demand is about 500t (converted into raw rubber). Based on an annual output of 3-4 million vehicles, the annual demand of fluororubber in China's automobile industry should reach 600-1000 tons.
The average annual growth rate of fluororubber demand in China is more than 30%. In 2000, the total consumption of all kinds of fluororubber was about 1100t. It is estimated that the demand (including products) will reach 5000t in 2005 (including 3000t in social maintenance), and 7000t (including products) in 2010 (including social maintenance capacity of 4000t).
2. Backward processing and Application Technology The development trend of fluororubber in the world is: to realize the serialization of products, attach importance to the development of a series of compound products with various curing systems and additives; develop and improve the series of products with low viscosity, rapid vulcanization, high tear strength, good demoulding performance and good extrusion performance for automobile industry; develop a wider range of high and low temperature resistance, hot water (steam) resistance, and high temperature resistance And further optimize the production process of the products to achieve closed and continuous.
At present, there is still a big gap in the development, processing and application of varieties in China, especially in the application and processing technology. Due to the backwardness of formula research, China still mainly stays on the high and medium viscosity rubber (accounting for 70% of the total application amount) in China, and the product quality is unstable and the production efficiency is low.
However, the low Mooney viscosity fluororubber has been widely used in foreign countries. For example, the extrusion and injection molding methods of low Mooney viscosity fluororubber are basically used in the Western European market, and the mechanical strength of the low Mooney viscosity fluororubber is compensated by the improved formula. Due to the advantages of moderate curing speed, good elasticity, easy processing and good demoulding performance, low Mooney viscosity rubber can meet the needs of processing complex geometric shape products, and the product performance is stable and the production efficiency is high. It is the mainstream direction of the development and processing of fluororubber. China fluorosilicone organic materials industry association has listed low Mooney viscosity fluororubber for extrusion and injection process as the first in the development of fluoroelastomer in the "Tenth Five Year Plan" of fluorochemical industry.
In terms of production technology, in general, the domestic and international technologies are basically synchronized. For example, the technologies adopted by Chenguang hospital such as the preparation of monomer by dilution and pyrolysis of freon, continuous polymerization to produce fluororubber with different fluorine content, wide molecular weight distribution and control technology, and production of low Mooney viscosity fluororubber have reached or approached the international advanced level.
Although the quality gap between domestic fluororubber and foreign products is gradually narrowing, and the domestic fluororubber products processing enterprises have opened up a broad world for the development of fluororubber, there is still a big gap in the product varieties and application research in China, especially the backward processing and application technology, which seriously restricts the development of fluororubber industry.
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