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Home > Industry News

Self-assembly and application of para-aramid nanofibers

Views : 56

Update time : 2024-03-26 21:38:26

About para-aramid

Para-aramid is a high-performance fiber composed of liquid crystal polymer aromatic polyamide. It has been widely used in national defense, aerospace and many civilian fields. Para-aramid has high strength, high modulus and outstanding heat resistance. Its specific tensile strength is 5-6 times that of steel wire, its specific tensile modulus is 2-3 times that of steel wire, but its density is only 1 times that of steel wire. /5 or so. In addition, its stability is very good, its shrinkage rate is zero at 150°C, and it can still maintain high strength at high temperatures, such as 65% of its original strength at 260°C. Para-aramid has good impact resistance, corrosion resistance and fatigue resistance, and is known as "ballistic fiber". Globally, para-aramid is mainly used in automotive friction materials, bulletproof equipment, and optical fibers. Para-aramid accounts for 30%, 30%, 15% of total demand.

Para / meta aramid comparison table

Product	Technology	Performance	Application
Para aramid	Low temperature polycondensation under anhydrous conditions	High strength, high modulus, high heat resistance, and good impact resistance, corrosion resistance and fatigue resistance	Known as "bulletproof fiber", it is widely used in the fields of national defense, aerospace, personal protection, sports and leisure, etc.
Meta aramid	There are low-temperature polymerization methods, interfacial polycondensation methods, emulsion polymerization methods, and gas-phase polymerization methods. Among them, low-temperature polymerization methods and interfacial polycondensation methods are more common.	Long-term thermal stability, intrinsic flame retardancy, excellent electrical insulation, and excellent corrosion resistance and radiation resistance	Electrical insulation clothing, high temperature protective clothing, high temperature conveyor belts, high temperature filtration and other fields

Research progress on para-aramid fiber

The technical difficulty and performance indicators of para-aramid are much higher than those of meta-aramid, so it has become a research hotspot for many companies. In recent years, my country's para-aramid industry has developed rapidly and has been widely used in many fields. According to the existing para-aramid standards and the current application status of the domestic market, the domestic para-aramid industry has carried out efforts in differentiated para-aramid. More in-depth research. At present, differentiated para-aramid fibers cover various types such as high-strength, high-model, and colored fibers, and are mainly used in the fields of bulletproof protection, electronic communications, and textiles.

High-strength and high-model para-aramid refer to high-performance fibers with strength ≥22cN/dtex and modulus ≥110GPa respectively. They are widely used in important fields such as bulletproof, outdoor optical cables and advanced composite materials. They are an important part of the construction of aerospace and national defense industries. important base material.

Application of para-aramid fiber

In the field of national defense and military industry, para-aramid fiber is an essential material for composite armor of tanks and armored vehicles. It is an important component of composite materials for missile casings and engines. It is the leading material for missile protective armor and explosion-proof and flame-retardant. It is widely used in Personal protection such as body armor and bulletproof helmets; in the aerospace field, it is a lightweight structural material and thermal protection material for rocket launchers; in the civilian field, it is used in tires and mechanical rubber products, friction and sealing materials, composite material reinforcement, ropes, Optical cables, electrical cables, etc.

Industry pain points and development suggestions for para-aramid fiber

The domestic para-aramid industry is continuing to develop, and differentiated para-aramid products are gradually becoming domestically produced, but there are still many difficulties:

(1) The key basic scientific issues of para-aramid have not been studied in depth, which restricts the development of products with higher performance; the key equipment for production is currently only produced by American, Japanese and European companies. Changes in the international situation make it possible for foreign countries to control production. Key equipment for para-aramid and other high-performance fibers have been blocked and sold, and prices have been suppressed, thus restricting the development of the domestic para-aramid industry.

(2) Since high-strength and high-modulus para-aramid products have just been industrialized, domestic awareness and market development have not yet been opened up, and domestic production capacity has not been fully released. Its related upstream and downstream industrial chains need to be deeply explored to further expand the product market. development efforts. In addition, the overall performance stability of aramid fiber produced in my country does not meet the requirements, and the production cost is high, lacks competitiveness, and lacks functional modification methods. This greatly limits the functional application of aramid fiber in many fields. In the future The development of aramid technology will continue to focus on high strength, high modulus, functional modification and new spinning manufacturing processes to reduce costs and expand application scope. At the same time, it is necessary to strengthen the research and development of key equipment for high-performance fiber production.

About para-aramid nanofibers

Para-aramid nanofibers have a diameter between 10 and 100nm and an aspect ratio of about 3000. In addition to high strength and high modulus, high temperature resistance, corrosion resistance, etc., they also have large specific surface area, high surface energy, and good dispersion. High water retention rate and excellent flame retardant properties. In addition, aramid nanofibers form a dense film with good dimensional stability and good insulation. They can form a uniform suspension with water and certain organic solvents and are easy to spray.

Due to its excellent properties, para-aramid nanofibers are suitable for aramid paper manufacturing and the preparation of heterogeneous components in special fields. They can be used in the field of special coatings or spray coatings and flocculants in composite reinforcement, battery separators, adsorption filtration, and electrical insulation. , flexible electrodes and other fields have broad application prospects.

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