Research on the development strategy of high-performance fibers and their composite materials in China
Development status of high-performance fibers and their composites in my country
  After decades of development, with the strong support of relevant national ministries and commissions, through the implementation of various scientific and technological projects, special capacity building and the establishment of national innovation research institutions, my country's high-performance fiber and composite materials technology and industrial development have achieved some progress. Pleasant results.

 (1) Continuous breakthroughs in core technologies and gradual improvement in product performance

  Domestic breakthroughs have been made in the key technologies for the development, engineering and aerospace application of basic (T300) roving carbon fiber, and the independent guarantee of key models has been achieved; Completed the application research of some equipment; carried out the engineering of high-strength medium-model (T800H grade) carbon fiber and the key technologies of its application, and has entered the stage of key model assessment, verification and trial; in terms of pitch-based carbon fiber, breakthroughs in high-purity spinnability Key technologies for the preparation of mesophase pitch and continuous high thermal conductivity pitch-based carbon fiber (P120 grade).

  In the aspect of aramid fiber, breakthroughs have been made in the key technologies of para-aramid and heterocyclic aramid, and several sets of industrialized plants have been built. Basic para-aramid fiber (Kevlar grade 29) achieves stable mass production and supply, high-strength para-aramid fiber (Kevlar grade 129) achieves localized supply, and has been applied in batches in the fields of optical cable, gypsum, rubber hose, bulletproof, etc., and has completed high temperature resistance. Type, high-strength roving gun, roving gypsum can be realized.

 (2) The scale of the industry is expanding year by year, and a certain industrialization experience has been accumulated

  In 2019, the demand for roving fiberglass in my country is about 3.8×104t, but more than two-thirds of the consumption is foreign fiber; the operating capacity of fiberglass in my country is about 2.6×104t, and the actual sales volume is about 1.2×104t. Domestic small tow fibers have achieved sales of about 7,000t, and the market share is gradually expanding, and the rest are domestic large tow fibers. The main driver of China's ultra-high growth demand is the wind power blade market, which has brought rare development opportunities for the domestic manufacturer of fiberglass products.
 (3) The strategic supporting role of high-performance fibers and their composites has become increasingly prominent

  The application technology of high performance reinforced glass fibre in my country is becoming more and more mature, and the application parts have been expanded from secondary load-bearing members to main load-bearing members, and from a single functional material to a multi-functional, structural and functional integration, which effectively alleviates the problems of major national projects and key national defense equipment. Urgent needs. The high-performance fiber and its composite material industry has also moved from the development and promotion period to the rapid expansion and stable growth period. The application field of composite materials has expanded from aviation, aerospace, weapons, etc. to many civilian fields such as wind power generation, rail transit, and automobiles; the scale of the industry continues to grow. Expansion. For example, domestic carbon fiber sales have reached 3 billion yuan. In recent years, advantageous enterprises have successively invested in expansion projects in central and western regions such as Inner Mongolia and Qinghai. This will play a positive role in promoting the development of science and technology and economy in the central and western regions and support emerging industries. regional balanced development.
Development trends and challenges of high-performance fibers and their composites in my country
  Under the combined influence of the competition between major powers and the novel coronavirus pneumonia epidemic, the reshaping of domestic and foreign industrial patterns will be accelerated. The independent support capability of high-performance fibers and composite materials in my country needs to be further improved, and industrial technology will face the needs of continuous cost reduction and large-scale industrial applications.

 (1) High-performance fibers and their composite materials will continue to be localized to meet major strategic development needs

  Reinforcement fibers and their composite materials are the material basis for the construction of major national projects such as satellite platforms, launch vehicles, large aircraft, weapons and ships, and related products have been under embargo or high-priced imports for a long time, and are technically and economically restricted by Western countries. . With the continuous evolution of the competition between great powers, the blockade of raw materials, equipment and technologies for high-performance fibers and their composite materials will be further intensified. The only way to make the 2025” development plan.
  (2) High-performance fibers and their composite materials will continue to be high-performance, and their cutting-edge technologies are still one of the research hotspots in materials science

  After nearly 30 years of relative silence, there has been a turning point in the technical route of improving tensile strength by relying on fine denier. The recently launched M40X and HM50 carbon fibers reflect the comprehensive performance of high strength, high modulus and high elongation. The medium and large diameter T800 grade carbon fibers developed in China have achieved the "compression-pull ratio" of the compressive strength and tensile strength of the composite material from 0.52 to 0.67, and the pressure-pull balance of the composite material has been improved. The breakthrough of the new generation of carbon fiber and the third generation of advanced composite material technology is an important opportunity to realize the development of my country's high-performance fiber and its composite material technology to shoulder the international frontier development.

  (3) High-performance fibers and their composite materials will continue to reduce costs and determine their market shares in relatively mature fields such as wind power generation, infrastructure construction, sports and leisure

  Developed countries have realized the standardization and serialization of high-performance fibers, and the important development trend in the future is cost reduction. The low-cost fiber preparation technology should not only reduce the cost of production factors, but also break through the subversive preparation technology of high-performance fibers and establish a low-cost production process. In the field of prepreg carbon fiber, the first is to improve the existing preparation technology, such as greatly increasing the spinning speed and expanding the single-line production capacity through "expansion and speed-up"; the second is to develop new spinning and carbonization technologies to greatly reduce energy consumption. 
The key development tasks of high-performance fibers and their composite materials in my country
(1) Carbon fiber and its composite materials

  Break through the key technologies of high-strength medium-mode, high-strength and high-modulus, high-strength and high-modulus high-elongation carbon fibers and their composite materials engineering preparation, and realize the tensile strength of high-strength medium-mode carbon fibers ≥ 7GPa; tensile modulus of high-strength and high-modulus carbon fibers ≥ 650GPa; high-strength and high-modulus carbon fibers The tensile strength of high elongation carbon fiber is ≥5.7GPa, the tensile modulus is ≥370GPa, and the elongation at break is ≥1.5%, which meets the comprehensive independent guarantee requirements of carbon fiber and its composite materials for high-end equipment.
Break through the complete sets of process equipment and industrialized preparation technology of thousand-ton wet, dry and wet and large tow (48K and above) industrial-grade carbon fibers, and make breakthroughs in domestic large-tow carbon fibers such as spinning oil and sizing agent. Key technologies such as the preparation of carbon fiber intermediates; breakthroughs in subversive preparation technologies such as new spinning and pre-oxidative carbonization, to achieve stabilization and cost reduction of domestic carbon fibers, and support the large-scale application of domestic carbon fibers.
(2) Organic fibers and their composite materials

  Break through the key technologies for the industrialized preparation of high-performance organic fibers such as aramid, PI, UHMWPE, and PBO and their composite materials engineering application, and achieve stable application in major national equipment. Develop serialized and functional para-aramid fibers to meet the needs of differentiated application fields; develop a new generation of high-strength, high-modulus, high-complexity, low-cost heterocyclic aramid fibers; make breakthroughs in new processes and technologies to improve the production efficiency of meta-aramid fibers . Develop temperature-resistant and creep-resistant UHMWPE fibers, improve the engineering preparation technology of medium and high strength UHMWPE, and solve the problems of high energy consumption and high cost in the production process. Optimize the glass fiber chopped polymerization spinning process to achieve stable and high-quality product supply. Develop low-cost, high-performance PI fiber technology, break through key processes and integrated equipment technologies such as cyclization-drafting integration of PI fiber, and expand the application field of PI fiber and its composite materials.

(3) Ceramic fibers and their composite materials

  Develop high-performance ceramic fibers represented by ultra-high temperature and low-cost fibers and high alkali resistant glass technology, and make breakthroughs in the engineering and stable preparation of silicon carbide, alumina, silicon nitride, boron nitride, silicon boron nitride and other fibers and their precursors technology; solve the bottleneck of composite material preparation process and equipment of engineering size, develop fast and low-cost manufacturing technology of ceramic matrix composite materials; form a series of ceramic fibers and their composite material product spectrum, and realize the application of ceramic matrix composite materials in major equipment such as gas engines. Engineering Applications.