In 2019, China's chemical fiber production was about 5.95×107t, accounting for about 80% of the total global chemical fiber production, which is the pillar industry of the national economy. Nowadays, in the context of international textile industry redistribution of labor, China's chemical fiber industry development faces some outstanding problems, such as the quality and cost of high-performance fibers do not have a competitive advantage in the market; bio-based fiber products are produced on a small scale, high cost, and can not yet effectively replace petroleum-based fiber products. These problems restrict the sustainable development of China's chemical fiber industry, affecting the formation of the industry's international competitive advantage. But these problems are also constantly prompting us, China's fiber materials industry urgently needs to accelerate the development of advanced fiber materials, so as to drive the chemical fiber industry and the textile industry's high-quality development!

1、Advanced fiber materials

Advanced basic fiber materials (referred to as advanced fiber materials) refers to the scale of production and widely used, with one or more of the following characteristics of the material: 1, physical and mechanical properties and good quality; 2, to ensure that the physical and mechanical properties to meet the application at the same time, can be given by physical and chemical means to give the material new functions; 3, can achieve the whole life cycle of the green level to enhance; 4, through digitalization, the Flexible and intelligent manufacturing process can improve the manufacturing efficiency and product quality of fiber materials and significantly reduce energy and material consumption. In this paper, we will analyze which direction China's fiber material industry should go by focusing on three types of advanced fiber materials: differentiated functional fiber, high performance fiber and bio-based fiber in chemical fiber.

2、Differentiated functional fiber materials

Differentiated functional fibers, is in the polyester fiber, polyamide fiber, regenerated cellulose fiber and other conventional chemical fiber preparation process, through the integrated use of molecular modification, functional component addition, special spinning and forming and fiber post-treatment and other one or several ways to prepare. Compared with conventional chemical fibers, these fibers can significantly improve or increase the performance and function of the fiber. China's differentiated functional fibers are generally in the early stage of rapid industrial development, but mostly conventional functional fiber varieties with relatively low added value, while the proportion of high value-added functional fiber varieties represented by antibacterial fibers is relatively low.

High quality, high function, low consumption and low emission is the direction of industrialization technology development of differentiated functional fibers. Facing the demand of large quantity and wide range, super simulation fiber, low temperature dyeing fiber, moisture-absorbing and quick-drying fiber, low melting point fiber, etc. are the key varieties of differentiated functional fiber.

3, high-performance fiber materials

The focus of the development of high-performance fibers in China is carbon fiber, aramid, ultra-high molecular weight polyethylene (UHMWPE) fiber, polyimide (PI) fiber and polyphenylene sulfide (PPS) fiber.

The development trend of carbon fiber is to reduce the cost of carbon fiber production by developing new, inexpensive and alternative carbon fiber precursor bodies and new process methods. The development trend of para-aramid is to promote the upgrading of application products through advanced technology and develop differentiated products to meet the requirements of high-end applications. the development trend of UHMWPE fiber is to develop differentiated products for high-end fields. the development trend of PI fiber is to reduce the production cost, the main ways are: first, to find a way out in monomer synthesis and polymerization methods; second, to use the high performance of PI fiber to improve Other polymers to develop a new class of performance than the aromatic PI fiber is slightly lower, but higher than the new species of modified polymers.

4, bio-based fiber materials

Biobased fibers refer to biomass as raw materials, or containing monomers of biomass origin, polymer fibers prepared by biotechnology, mainly including Lyser fibers, polylactic acid fibers, biobased polyester fibers and biobased polyamide fibers. 2019, there are three domestic enterprises with 10,000 tons of Lyser fiber production line, single-line design capacity are 3.0 × 104t / a, and Austria Lenzing has reached 6.7 × 104t / a single line capacity, compared with further technical upgrades are needed.

The future development of Lyser fiber focuses on achieving high quality, low cost and wide application of the product through technical improvement; at the same time, Lyser functional fiber will also be developed rapidly and show high added value, such as flame retardant fiber, anti-pilling fiber and other varieties. PLA fibers to improve heat resistance is the future development trend, the urgent need to master the development of D-type PLA and the preparation of stereoisomeric complex technology.

Summary

The future trend of the development of China's advanced fiber materials industry is to break through the key core technologies to form iconic products, mainly super simulation fibers, flame retardant fibers, conductive fibers, high-performance industrial filaments, geotechnical building reinforcing fibers, high-performance fibers, bio-based fibers and several other aspects. Fundamentally solve the structural overcapacity, improve the proportion of medium and high-end products in China, so that the green and intelligent level of fiber materials to reach the international leading, driving the entire textile industry overall into the value chain in the high-end. (Text: Echo)

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