Functional yarn | How much do you know about this fire-retardant fiber?

Polyimide fiber (PI fiber), also known as aramid fiber, refers to a fiber containing aramid in the molecular chain. PI fiber has good spinnability and can be made into textiles for various special occasions.

Polyimide fiber has good spinnability and can be made into textiles for various special occasions. Due to its high and low temperature resistance, flame retardancy, no dripping, self-extinguishing when removed from fire and excellent temperature insulation, polyimide fiber thermal insulation protective clothing is comfortable to wear, has good skin adaptability, is permanently flame retardant, and has a large size It is stable, safe and has a long service life. Compared with other fibers, due to the low thermal conductivity of the material itself, it is also an excellent thermal insulation material. In terms of labor protective clothing, my country’s metallurgical sector needs 50,000 sets of heat-insulating, breathable, soft flame-retardant work clothes every year, and the hydropower, nuclear industry, geological and mining, petrochemical, oil fields and other departments need 300,000 sets of protective clothing every year, which can withstand high temperatures. The flame retardant special protective clothing fiber is about 300t.

Non-woven fabrics made of polyimide fiber are the most ideal fiber materials for making fire-resistant and flame-retardant clothing such as protective clothing for armored forces, flame-proof racing suits, and flight suits. This kind of nanofiber nonwoven fabric can also be used to make comfortable and warm functional clothing, such as military clothing, medical hygiene clothing, casual clothing to eliminate bad body odor, special clothing to prevent biological and chemical weapons, medical hygiene protective clothing, high-efficiency smoke protection masks, etc. .

NO.1 Physical properties

ether homopolymer fiber strength 4～5cN/dtex, elongation 5%～7%, modulus 10～12GPa, strength retention rate after 100h at 300℃ 50%～70%, limiting oxygen index 44, good radiation resistance; ketone copolymer fiber It has a nearly hollow special-shaped section, strength 3.8cN/dtex, elongation 32%, modulus 35cN/dtex, density 1.41g/cm, shrinkage in boiling water and 250℃ is less than 0.5% and 1% respectively.

NO.2 Spinning method

Polyimide fiber spinning The method is divided into wet spinning and dry spinning. Depending on whether the spinning slurry is polyimide or polyamic acid, there are one-step spinning and two-step spinning.

The first step is to wet or dry the concentrated solution of polyamic acid The second step is to chemically cyclize or thermally cyclize the polyamic acid fiber spun in the first step to obtain polyimide fiber, so it is called a two-step method.

Two-step spun polyimide fiber It is a method that has been commonly used since the development of polyimide fiber.

The fiber stretching process can be done in The first step can be carried out, or it can be carried out during the second step of imidization, or a certain amount of stretching can be carried out in each step.

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