In 2017, the key technology and application project of dry-jet wet spinning high-strength / medium-mode carbon fiber industrialization won the first prize of National Science and Technology Progress Award. The batch supply has filled the blank of China's high-performance carbon fiber production technology represented by dry-jet wet spinning technology, and it has also broken the long-term monopoly of our market by foreign high-performance carbon fiber companies.
According to Zhang Guoliang, the first person who completed the project and technical director of ZFSY Carbon Fiber Technology Group, carbon fiber is a new type of high-strength, high-modulus fiber material with a carbon content of 95% or more. It is widely used in aviation, aerospace, national defense industry, sports equipment and other fields. It is a critical strategic material urgently needed by national security and weapons and equipment. It is also a sensitive material for long-term foreign technology blockade and product monopoly.
China's carbon fiber research began in the 1960s and 1970s, but because of the long production cycle and the production process involves changes in various physical and chemical forms such as polymer polymerization, polymer polymer solidification and forming, and high-temperature oxidized carbonization, research and development have been in experiment. Small-scale production test phase. Coupled with backward production technology and equipment, carbon fiber quality and performance stability is also poor, China's carbon fiber market has long been in a monopoly state of imported products, high import prices and strict technical blockade, severely restricting the development of China's carbon fiber.
In August 2000, China set up a special research group of "Polyacrylonitrile-based (PAN) carbon fiber development countermeasures" with the academician of the two academies, Chang Xu as the team leader.
The research and development team broke through the advanced technology of preparing high-performance carbon fiber-dry-jet wet spinning. "Compared with wet-process carbon fiber, the mechanical properties of dry-jet wet-spinning technology have been greatly improved, production efficiency has been significantly improved, and energy consumption has been significantly reduced, which has become a new technology for producing high-performance carbon fibers." Zhang Guoliang introduced. The dry-jet wet spinning process is considered to be the mainstream process for carbon fiber production in the future, but it is also recognized as a hard-to-break spinning technology in the carbon fiber industry. Previously there were only a few foreign companies in the world.
The breakthrough of this key technology enables the spinning speed to reach more than 400 meters per minute, which is 5 times that of traditional wet spinning. After breaking through the key technologies of dry-jet wet spinning, the research team developed a homogeneous polymerization system, efficient and environmentally friendly stripping, stable dry-jet wet spinning, and energy-saving pre-oxidation complete sets of technologies, creating China's first 1,000-ton dry-jet wet spinning process. Carbon fiber production line.
Today, with the continuous innovation and improvement of technology, the production line has achieved continuous and stable production, and the performance and quality of the carbon fiber products have been greatly improved. The mechanical properties have reached the level of imported T700S carbon fibers, and they have been supplied to the market in batches. Greatly promoted the development of China's carbon fiber composite material industry. The academician of the Chinese Academy of Engineering, Sun Jinliang, commented that the carbon fiber production line based on the dry-jet wet-spinning process of the project has reached the leading level in domestic research and development, and some performance indicators exceed the level of similar foreign products. According to tests by the domestic carbon fiber industry authoritative test center Beihang and Beihua National Laboratory, the carbon fiber consistency index produced by this project has reached the international advanced level.
At present, ZFSY Carbon Fiber Technology Group has become the only company in China and the third company in the world to overcome the dry jet wet spinning process. Its annual carbon fiber production capacity has reached 6,000 tons, and its domestic fiber market share has reached 60% for many years.
It took 12 years and invested more than 2 billion yuan. ZFSY continuously conquered the carbon fiber production dope preparation technology, equipment production technology, PAN fiber rapid homogeneous pre-oxidation, carbonization integration technology, and constructed a dry-jet wet spinning 1,000-ton high-strength / medium The industrialized production system of carbon fiber has built the first complete set of dry-jet wet-spun carbon fiber production equipment with completely independent property rights. "However, there are still gaps between our products and advanced foreign products in some aspects, such as the incomplete variety structure, but I believe that it is only a matter of time to strive to catch up with the level of foreign carbon fiber through efforts." Zhang Guoliang said.
Up to now, the project has been authorized 17 patents, including 13 invention patents, published 41 papers, and the T700, T800, and T1100 carbon fiber products developed have been applied to aerospace, carbon core cables and other fields.
"In the future, we will continue to be the Chinese own carbon fiber. We will build on the dry spray wet carbon fiber technology and build a 10,000-ton carbon fiber production base during the" 13th Five-Year Plan "period to continuously improve and improve the performance of domestic carbon fiber and develop more Products with high strength and modulus will further reduce production costs and realize the replacement of imported products as soon as possible. "Zhang Guoliang said.