According to the "Technology Daily" reported on June 27, "the carbon fiber industry chain has many core links, including upstream raw silk production, midstream carbonization, downstream composite materials and their applications. After more than ten years of research and development and breakthrough, China's carbon fiber' The problem of the card neck is mainly in the downstream application, namely composite materials and products," said He Yanli, vice president of the China Chemical Fiber Industry Association.

carbon fiber is a high-strength new fiber material with a carbon content of more than 95%. Its quality is lighter than that of metal aluminum, but its strength is higher than that of steel. It can also withstand high temperature, corrosion resistance, fatigue resistance and creep resistance. One of the key composite materials is epoxy. Epoxy resin has excellent physical and mechanical insulation properties and strong adhesion, which can bond carbon fibers together. However, the high-end carbon fiber currently produced in China is all imported.

Vulnerable epoxy resin modification

According to the mechanical properties, carbon fiber can be divided into high-strength, ultra-high-strength, high-modulus and ultra-high modulus. In the Toray product code of Japan, T refers to the number of tonnages of this type of carbon fiber that can be withstood by a unit area of ​​1 square centimeter, that is, the higher the T number, the better the carbon fiber quality; the modulus refers to the external tension or pressure. The tensile modulus of the original shape is restored. At present, China has been able to produce higher-end carbon fiber such as T800, but Japan has mastered this technology in the 1990s.

Lack of intelligent automation equipment

The biggest threat to the performance of continuous carbon fiber reinforced composites is the low-speed impact delamination of composites, which is the core of high-performance composites that can be applied in aircraft structures. One of the main reasons for the sensitivity of composite materials to impact delamination damage is the insufficient toughness of epoxy resin itself.

Application of traction is not progressing slowly

Epoxy resin is special, "different uses, its structure and performance are different." Kong Zhenwu said that China's carbon fiber materials production and application are out of touch with each other, the application is not enough traction, no feedback correction, epoxy resin and other technological progress naturally slow.

Yancheng Xiangsheng carbon fiber Technology Co., Ltd. is a state-level high-tech enterprise approved by the National Development and Reform Commission and the State Administration for Industry and Commerce. It has 13 utility model patents, two invention patents, and one design patent. It is now China's carbon material industry. Member unit of the association, member of the China Friction and Sealing Materials Association.