The development of high-performance fiber represented by carbon fiber is a manifestation of the comprehensive strength of a country. In the ten major areas identified by "Made in China 2025", the seven major areas are closely related to high-performance fiber. Recently, the theme salon for low-cost manufacturing technology of high-performance fiber sponsored by Beijing Branch of SAMPE was successfully held in Beijing University of Chemical Technology. The purpose of this activity is to promote the technological upgrade and innovation in the industry by sharing the experience and insights of low-cost manufacturing of high-performance fibers through the communication among production, study, research and other units in the high-performance fiber industry chain.

    This issue focuses on the carbon fiber "low-cost, stable preparation" and "industrial application" of the two key words were discussed. Beijing University of Chemical Technology Carbon Fiber Engineering and Technology Research Office, SAMPE Beijing Branch executive director Professor Liu Jie attended the event, Beijing University of Chemical Technology Materials Science and Engineering Wang Xiaoxu associate professor, Chinese Academy of Sciences Ningbo Materials Research Institute researcher Chen Youfu Eagle Carbon Fiber Co., Ltd. Yang Rui engineer, Beiqi Group New Technology Research Institute Lightweight Technology Shang Hongbo senior engineer, Wei Gong Jun Jing Technology Co., Ltd. Deputy General Manager did a special sharing, carbon fiber manufacturing enterprises, research institutes and high-performance fiber applications near Thirty delegates attended the salon discussion.

    Wang Xiaoxu, Associate Professor introduced the progress of the research on the preparation of high performance and low cost carbon fibers at the National Center for Carbon Fiber Engineering of Beijing University of Chemical Technology: 1. From the perspective of building a new theoretical system of technology, Pre-oxidation process using microwave rapid carbonization and plasma surface treatment of high-performance carbon fiber to complete the idea of ​​rapid, low-cost preparation. 2, through the existing large filament carbon fiber precursor irradiation 30 seconds method to reach a substantial exothermic peak advance and flattening purposes, thereby shortening the pre-oxidation time. 3, through the method of electrospinning to obtain nanoscale carbon fiber precursor, reducing the probability of single fiber defects to further enhance the strength of carbon fiber. 4, through the 3D printing manufacturing technology to reduce carbon fiber manufacturing costs. 5, through the nano-modified high-performance fiber composite materials to improve the overall strength of carbon fiber, modulus and fatigue resistance.

    Chen Youlian researcher from the perspective of molecular structure to explain the use of functionalized terminal structure to improve radical polymerization free radicals radical polymerization rate difference caused by different PAN thermal properties: 1, can increase the degree of PAN homopolymer cyclization so that the polymerization product Thermal stability tends to be consistent. 2. The use of suitable PAN molecular weights contributes to achieving both final carbon fiber performance and thermal stabilization behavior consistency. 3, through the terminal modification of PAN in the rapid pre-oxidation is expected to be more uniform structure.

    China Eagle Eagle Carbon Fiber Co., Ltd. Yang Rui engineers introduced the current company in the current production capacity and production capacity of carbon fiber: now has four polymerization lines, six of the original silk thread and 10 carbonized lines. Is the original silk production capacity of 13,000 tons / year, carbon fiber production capacity of 6,000 tons / year, the existing production line opened in about 3,000 tons. It is pointed out that the current cost of PAN-based raw silk accounts for about 70% of the cost of carbon fiber, and the manufacturing cost of carbon fiber can be effectively controlled by reducing the manufacturing cost of raw silk. And introduce the current cost reduction measures taken by Condor company: 1, through the production of large tow carbon fiber to reduce manufacturing costs, Condor company has completed 24K carbon fiber trial this year. 2, dry jet wet spinning original wire speed breakthrough to 400m / min, wet spinning more than 4 times (Toray dry jet wet spinning line speed reached 700m / min). 3, using rapid pre-oxidation technology, the pre-oxidation time is shortened to 34min.

    Vice President Wei Guojun of Jinggong Technology Co., Ltd. introduced the progress of low cost from the point of view of carbon fiber manufacturing equipment: 1.Improve the localization rate of equipment manufacturing and reduce the investment in fixed assets. 2, increase the speed of production line silk, extend the single production cycle. (The design and production line runs for 45 days and the wire speed is 12-15m / min.) 3. The energy consumption of carbon fiber production units will be reduced by increasing roller width and preheating recovery technology.

    Senior Engineer Shang Hongbo of Lightweight Technology Department of BAIC New Technology Research Institute introduced the technical development background of lightweight automobile and the application status of carbon fiber reinforced composite materials in automobile industry. Pointed out: 1, high prices have constrained the development of carbon fiber in the automotive industry, the urgent need to develop low-cost carbon fiber reinforced composite material production technology. 2, carbon fiber composite materials need to develop rapid prototyping of automated manufacturing technology to meet the production cycle of the automotive industry. 3, need to solve the carbon fiber reinforced composite materials repair and recovery issues.

    After the special topics were shared, the participants discussed the preparation of non-PAN base yarn, the application of pitch-based carbon fiber and the manufacture of standardized products of carbon fiber reinforced composites. Professor Liu Jie pointed out in the summary of the activity that different products Different performance requirements and positioning. Carbon fiber as a reinforcing material used in composite products according to the characteristics of the product industry and performance requirements of the appropriate selection of materials, and through the optimization of design, automated processing and manufacturing to further reduce the manufacturing cost of complex products. The development of modern science lies largely in the innovation of interdisciplinary science. The domestic carbon fiber industry has been tracking the status of international advanced technologies for the past 40 years. With the progress and innovation in science and technology, it is hoped that the domestic carbon fiber industry will catch up with the international advanced level .

    After the discussion session participants and visited the Beijing University of Chemical Technology National Carbon Fiber Engineering and Technology Research Center. Through the exchange and sharing of this salon, we learned that there is still a gap between China's carbon fiber manufacturing technology and the international advanced level in terms of quality and stability, spinning speed and productivity. With the gradual deepening of domestic understanding of carbon fiber basic research and application, domestic carbon fiber manufacturers, carbon fiber equipment manufacturers and research institutes have realized that it is necessary to improve the industrial application of carbon fiber through the low cost of carbon fiber. In addition, Production has made some progress. The low cost of carbon fiber is a relative concept that needs to be positioned according to the product, combined with structural design, and low cost manufacturing techniques to apply the appropriate material to the appropriate product to achieve a suitable price / performance ratio.