Shaanxi Tiance New Material Technology Co., Ltd. independently developed the continuous spinning technology to produce high-performance pitch-based carbon fiber, which is the first in China to open the process and achieve small batch production, with an annual production capacity of more than 2 tons. This will break the foreign technology blockade, for China The foundation for the application of high-end new materials in aerospace and defense.
'Using continuous pre-oxidation, carbonization, and graphitization to produce MPCF, we are the only company in China that has completed the whole process and realized small-volume supply.' Zhang Hongxiang, deputy general manager of Tiance Technology, told reporters that they passed with Beijing University of Chemical Technology. Cooperation, using naphthalene synthesis and petroleum residue, coal tar modulation, developed mesophase pitch for MPCF spinning. Mesophase pitch fiber was produced by melt spinning, and then pre-oxidized, carbonized, graphitized and other processes were obtained. Mesophase pitch-based carbon fiber.
For the core and difficulties of continuous processing of these pitch-based carbon fiber technologies for melt spinning, Tiance Technology has carried out experimental research and research on single hole, 20 holes, 50 holes, etc., achieving 500-hole continuous spinning and microstructure controllable, and It can be synthesized into 1000~6000 pieces, and the maximum length can reach more than 5000 meters, which is the first in China. Then the company has completed TC-HM-20, TC-HM-60, TC-HM-70, TC-HM-80, etc. The product series of 4 series, MPCF continuous length of 500 meters, to achieve a single batch of 60-axis and above small batch production. At the end of 2015, the company built an annual output of 600 kg of carbonized 1 line, and in May this year built an annual output of 1500 kg. Carbonization 2 lines.
In 2017, Tiance Technology realized MPCF supply of more than 30 kilograms, and the unit can run continuously for up to 40 days in a single batch. In the first half of this year, it produced more than 50 kilograms of MPCF. The products are mainly used in aerospace and defense.
In July 2017, it was tested by Beihang High Performance Carbon Fiber Testing and Evaluation Center that the tensile strength of MPCF produced by Tiance Technology reached 3010MPa, the modulus of elasticity was 864GPa, the thermal conductivity was 615W/m·K, the elongation was 0.35%, and the diameter was 12 ~16μm, density about 2g/cm3.
On the basis of the previous research and development results, Tiance Technology accelerated the pace of industrialization. At present, the 20-ton/year MPCF project located in Xi'an Aerospace Base is under construction. The project has an investment of 260 million yuan and is expected to be completed by the end of 2019.
It is understood that MPCF has excellent performance and is a strategic high-end new material for global aerospace and defense competition. It is mainly monopolized by Japan, the United States and other countries. Tiance Technology mainly purchases mesophase asphalt to produce MPCF. According to reports, although China has mastered Mesophase asphalt synthesis technology, but due to the current stable and continuous supply of asphalt residue in China, imports have been restricted, and raw material supply has become an important link in the industrialization of MPCF.
High-performance pitch-based carbon fiber (MPCF) is a high-performance carbon fiber with a carbon content of more than 99%. It is prepared from raw material mesophase pitch by spinning, non-melting, carbonization and graphitization. It is the high-end of the carbon fiber family. product.
MPCF has excellent high modulus, low expansion, high thermal conductivity, high damping and good electrical conductivity. The tensile modulus is 4 times that of steel, the thermal conductivity is 2.5 times that of copper, and it can withstand temperatures above 2000 °C, and the density is small. It is one of the best functional and structural integration materials, and has a good application prospect in aerospace, aviation, military and civilian fields.
For example, it can be used for large-sized optical components, satellite antenna reflectors, supersonic aircraft nose cones, etc.; carbon/carbon composite materials made of high thermal conductivity MPCF are used for high-speed aircraft surface heat protection, high thermal conductivity, high impact resistance, high strength. , high modulus and other characteristics, can achieve non-ablative heat protection and thermal structure bearing of hypersonic aircraft; in civilian field, MPCF can be used for large printing roller, robot arm, golf club, high-speed iron head cover, large electronic device radiator Wait.
At present, only Japan's Mitsubishi (MPI), Japan's graphite fiber (NGF), the United States Cytec (Cytec) three companies can produce MPCF, a total capacity of 1410 tons / year, the product is in short supply, these companies are planning to expand production.