Method for producing anti-pilling acrylic fiber

Abstract

The invention relates to a method for producing anti-pilling acrylic fiber by taking polyacrylonitrile as spinning raw material and sodium thiocyanate solution as the spinning solvent. The method for producing anti-pilling acrylic fiber comprises the following steps: (1) forming spinning solution into primary fiber with a spinneret assembly in coagulating bath; (2) heating to stretch the primary fiber by steps at 95-99 DEG C by 5.0-8.5 times; (3) eluting the primary fiber with hot water; (4) heating, drying and densifying the primary fiber in the tensing state with hot air: (5) post-heating to stretch the primary fiber at 110-140 DEG C by 1.0-2.5 times; (6) curling the primary fiber and thermoforming the primary fiber at 10-120 DEG C; and (7) oiling and cutting off the primary fiber to obtain the product of anti-pilling acrylic fiber. The product of anti-pilling acrylic fiber is produced with the process for producing acrylic fiber in one step by taking sodium thiocyanate solution as the spinning solvent, and the product of anti-pilling acrylic fiber has very excellent anti-pilling performance and other various physical performance indexes.

Description

technical field [0001] The invention relates to a method for producing acrylic fibers, in particular to a method for producing acrylic fibers with anti-pilling performance by using a sodium thiocyanate aqueous solution as a solvent in a one-step process. Background technique [0002] Acrylic fiber has the characteristics of wool, good bulkiness and warmth retention, soft to the touch, mildew-proof and moth-proof, and has very superior light resistance and radiation resistance. It is ideal for fabrics such as underwear, fabrics, sweaters, blankets and carpets. At present, its output is second only to polyester fiber, polyamide fiber and polypropylene fiber in synthetic fibers, and it is the main raw material for the textile industry. [0003] However, fabrics containing acrylic fibers, especially knitted fabrics, are prone to pilling after being subjected to frequent friction. These pills not only affect the appearance, but also lead to a decline in style such as hand feeling...

AI Technical Summary

Problems solved by technology

This allows a greater room for adjustment in the processing technology for changing the physical properties of the fiber in the post-processing process

And relatively speaking, the sodium thiocyanate aqueous solution is a solvent in the one-step acrylic fiber manufacturing process, the total solid content of the spinning stock solution is much lower, the void ratio inside the as-spun fiber is very high, and the adjustment leeway of the post-treatment process is very small. It is easy to lose sight of the other and cause the fiber to fail to maintain its proper physical properties, so it is often difficult to obtain high-performance anti-pilling acrylic products

Images