Aramid fiber overview

Aramid fiber is a new synthetic high-performance fiber with high strength and modulus, high temperature resistance, acid and alkali resistance, good insulation and aging resistance, and is widely used in aviation, national defense, building materials and other fields. There are two kinds of aramid fiber with use value: one is meta-aramid fiber with zigzag molecular chain arrangement; the other is para-aramid fiber with linear molecular chain arrangement.

With the successful development of aramid fiber materials, it is used in aerospace, national defense, automobile, heat resistance, reinforcement and composite materials. Many of Shanghai Chengge's flame-resistant suits and flight suits use aramid fibers. Aramid fiber is mainly divided into three types: ortho, meta, and para, and ortho aramid fiber has no commercial value. The aramid fiber that has been industrialized is mainly aramid fiber 1313 (polyisophthaloyl mphthalamide Diamine fiber) and aramid fiber l414 (poly-paraphenylene terephthalamide fiber). At the same time, aramid fiber has the form of chopped fiber, precipitated fiber and pulp. Aramid chopped fibers and precipitated fibers are also gradually applied to mica paper insulation materials, called aramid fiber mica paper. Aramid fiber mica paper is a research hotspot in recent years. It has the characteristics of high electrical resistance, good flexibility and high strength. It is an ideal material for the main insulation of motors.

Aramid fiber is the abbreviation of aromatic polyamide fiber. There are mainly two types of para-aramid fiber (1414 for short) and meta-aramid fiber (1313 for short). The main difference between these two types of aramid fiber is that phthaloamide The position of the bond to the C atom on the benzene ring is different. Aramid fiber has extremely high strength, modulus, toughness, and has excellent insulation performance and high temperature resistance. The length of aramid fiber is mainly determined by the performance of the product, and the specification is 2~80mm, or even longer.

Aramid fibrid fiber is a kind of fully aromatic polyamide synthetic material produced by high-speed centrifugal shearing of aramid spinning stock solution in a coagulation bath. It has excellent liquid phase dispersion performance and composite reinforcement effect. The aramid paper-based material prepared from it has the characteristics of high strength and high modulus, light flame resistant, high temperature resistance, corrosion resistance and excellent insulation performance, and can be used as a high temperature resistant insulating material for electric motors, transformers, reactors and other power Equipment is an important basic material to promote the development of modern power industry.

The meta-aramid precipitated fiber in the aramid fiber was prepared in the 1960s. It has a soft shape and is easy to disperse in water. Bulk melting occurs, and the reinforcing fibers are firmly bonded, thus endowing the paper-based material with excellent mechanical strength and dielectric properties. Therefore, it is widely used as a bonding fiber in the manufacture of special paper-based materials. Para-aramid fibrid fiber is a new differentiated product of meta-aramid fibrid fiber, and its application in the field of high-performance paper-based materials has great potential.

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