Preparation method of durable low-smoke halogen-free flame-retardant polyacrylonitrile fiber

Abstract

The invention relates to a preparation method of durable low-smoke halogen-free flame-retardant polyacrylonitrile fiber. The preparation method of durable low-smoke halogen-free flame-retardant polyacrylonitrile fiber is characterized by comprising the following steps: 1) blending spinning solution preparation: based on the mass parts of the polyacrylonitrile powder and the phosphorus-containing flame retardant, dissolving 65-80 parts of polyacrylonitrile powder and 20-35 parts of phosphorus-containing flame retardant into a 50-52wt% sodium thiocyanate aqueous solution, and mixing to obtain the blending spinning solution, wherein the ratio of the total mass of the polyacrylonitrile powder and the phosphorus-containing flame retardant to the mass of the 50-52wt% sodium thiocyanate aqueous solution is (10-15):100; 2) wet spinning; and 3) irradiation: irradiating primary flame-retardant polyacrylonitrile fiber in an electron beam accelerator with 0.5-5MeV or a <60>Co device to obtain the durable low-smoke halogen-free flame-retardant polyacrylonitrile fiber, wherein the irradiation dose is 20-50kGy. The fiber prepared by using the method has good flame-retardant durability and small smoke generation property.

Description

technical field [0001] The invention belongs to the technical field of chemical fiber materials, in particular to a method for preparing durable low-smoke, halogen-free, flame-retardant polyacrylonitrile fibers. Background technique [0002] Polyacrylonitrile fiber is one of the four major varieties of synthetic fibers. Its output is second only to polyester fiber and polyamide fiber in synthetic fibers. The world's output has reached 3 million tons per year. Polyacrylonitrile fiber is an excellent raw material for textile products. The fiber is light-resistant, radiation-resistant, soft and warm. It is known as "artificial wool" and is widely used in clothing fabrics, tarpaulins, curtains and other fields. But its biggest disadvantage is flammability, its limiting oxygen index is only 17-18%, which is the lowest among synthetic fibers, and its use is limited to a certain extent, so the flame-retardant modification of acrylic fiber is of great significance. Foreign flame-re...

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Problems solved by technology

[0005] CN 1566421A discloses that after ammonium polyphosphate is treated with silane coupling agent or titanate coupling agent, it is added to the aqueous solution of NaSCN of polyacrylonitrile, and wet spinning is carried out by conventional spinning process to obtain flame retardant Polyacrylonitrile fiber, but the polyacrylonitrile fiber containing ammonium polyphosphate flame retardant has problems such as moisture absorption and migration

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