With the development of science and technology, the technology of resin and glass fiber is constantly improved, and the manufacturing capacity of manufacturers is generally improved, which makes the price and cost of glass fiber reinforced composites accepted by many industries, but the strength of glass fiber reinforced composites is not enough to compete with metals. Therefore, carbon fiber, boron fiber and other reinforced composite materials have come out one after another, making the polymer composite material family more complete and becoming essential materials in many industries. At present, the annual output of composite materials in the world has reached more than 5.5 million tons, with an annual output value of more than $654.38+03 billion. If the high-value products of European and American military aerospace are included, its output value will be even more amazing. From a global perspective, the production of composite materials in the world is mainly concentrated in Europe, America and East Asia. In recent years, the production and demand of composite materials in Europe and America are increasing continuously, while in Asia, the development of Japanese composite materials is relatively slow due to economic recession, but the market in China, especially in China, is developing rapidly. According to the statistics of PPG, the world's leading manufacturer of composite materials, the global share of composite materials in Europe in 2000 was about 32%, and the annual output was about 2 million tons. At the same time, the average annual growth rate of composite materials in the United States in the 1990s was about twice the GDP of the United States, reaching 4%~6%. In 2000, the annual output of composite materials in the United States reached about 6.5438+0.7 million tons. In particular, the rapid increase of composite materials for automobiles has made American automobiles rise again in the global market. The development of composite materials in Asia in recent years is closely related to the overall changes in politics and economy, and the share of countries has changed greatly. Generally speaking, composite materials in Asia will continue to grow, with a total output of about 6,543,800 tons in 2000, and it is estimated that the total output will reach 6,543,800 tons in 2005.

Composite material refers to a material composed of two or more different substances in different ways, which can give full play to the advantages of various materials, overcome the defects of a single material and expand the application scope of materials. Composite materials have gradually replaced wood and metal alloys because of their light weight, high strength, convenient processing and molding, excellent elasticity, chemical corrosion resistance and good weather resistance, and have been widely used in aerospace, automobile, electronic and electrical, construction, fitness equipment and other fields, and have developed rapidly in recent years.