Flame-retardant acrylic fiber and preparation method thereof
A technology of flame-retardant acrylic fiber and acrylic fiber, which is applied in the direction of flame-retardant fiber, fiber type, fiber treatment, etc. It can solve the problems of poor flame-retardant effect and complicated production process of flame-retardant acrylic fiber, and achieve the effect of excellent flame-retardant performance
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Embodiment 1
[0044] The mass fractions of three monomers of acrylonitrile, vinyl acetate and vinylidene chloride during the polymerization of the copolymerized acrylic fiber are: 78%: 10%: 12%. The polymerization spinning process adopts the general-purpose acrylic fiber aqueous precipitation polymerization; the sodium thiocyanate aqueous solution method wet spinning, that is, the polymer powder is dissolved in the sodium thiocyanate aqueous solution to obtain the spinning stock solution, and then the spinning stock solution is transported to the spinning machine. In the spinning equipment, after being extruded by the nozzle, it is formed in the coagulation bath, and then the copolymerized acrylic fiber is obtained through the coagulation bath drawing and washing process. The controlled spinning condition is that the pump supply is 1.2g / min. The nozzle is 30 holes.
[0045]Add the copolymerized acrylic fibers into 20wt% hydrazine hydrate solution at 95°C at a bath ratio (mass ratio) of 1:15,...
Embodiment 2
[0047] The mass fractions of three monomers of acrylonitrile, vinyl acetate and vinylidene chloride during the polymerization of the copolymerized acrylic fiber are: 78%: 10%: 12%. The polymerization spinning process is the same as in Example 1.
[0048] Add the copolymerized acrylic fibers into 20wt% hydrazine hydrate solution at 95°C at a bath ratio (mass ratio) of 1:15, stir and fully react for 1 hour; wash the obtained fibers with distilled water until the aqueous solution becomes neutral, and dry them at 80°C for backup use. Then, the obtained fibers were added into an aqueous solution of 10 wt % zinc chloride at a bath ratio (mass ratio) of 1:15, and heated at 90° C. for 0.8 h to fully contact the solvent with the fibers. Finally, wash with water, and dry the obtained fiber at 80° C. to obtain the flame-retardant acrylic fiber. The fiber LOI reached 33.2%, the breaking strength was 2.9cN / dtex, and the breaking elongation was 27.5%.
Embodiment 3
[0050] The mass fractions of three monomers of acrylonitrile, vinyl acetate and vinylidene chloride during the polymerization of the copolymerized acrylic fiber are: 78%: 10%: 12%. The polymerization spinning process is the same as in Example 1.
[0051] Add the copolymerized acrylic fibers into 20wt% hydrazine hydrate solution at 95°C at a bath ratio (mass ratio) of 1:15, stir and fully react for 1 hour; wash the obtained fibers with distilled water until the aqueous solution becomes neutral, and dry them at 80°C for backup use. Then, the obtained fibers were added into an aqueous solution of 10 wt % zinc chloride at a bath ratio (mass ratio) of 1:15, and heated at 90° C. for 1 hour to fully contact the solvent with the fibers. Finally, wash with water, and dry the obtained fiber at 80° C. to obtain the flame-retardant acrylic fiber. The fiber LOI reached 34.4%, the breaking strength was 1.8cN / dtex, and the breaking elongation was 22.6%.
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Abstract
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