Manufacturing method of dry-laid acrylic fiber

Abstract

The invention relates to dry-process acrylic fibers and particularly relates to a production method of a dry-process acrylic fiber. The method comprises the steps of preparation of a polymer stock solution, spinning formation, washing, drafting, oiling, curling, secondary oiling and drying in sequence to obtain the dry-process acrylic fiber, wherein the preparation of the polymer stock solution comprises the step of with polyacrylonitrile as a raw material and dimethylformamide or dimethylacetamide as a solvent, adding polyacrylonitrile dry powder into the solvent to obtain the polymer stock solution, wherein a technology of segmented control on stirring speed and a vacuumizing treatment technology are adopted in the whole dissolution process. In the method, the polyacrylonitrile dry powder is uniformly dispersed into the solvent to obtain the uniform polymer stock solution without bubbles; the dry-process acrylic fiber produced by the method has good spinnability while the cost is low.

Description

technical field [0001] The invention relates to dry-process acrylic fibers, in particular to a method for manufacturing dry-process acrylic fibers. Background technique [0002] Acrylic fiber is the trade name of polyacrylonitrile fiber (PAN) in China. Acrylic fiber has excellent performance, soft and warm feel, good elasticity, and excellent light and weather resistance. According to its spinning process, it can be divided into dry acrylic fiber and wet method. Acrylic. The unique dog-bone structure of dry-process acrylic fiber makes its properties close to natural wool. The fabric made of it has good elasticity and light weight. The finished product has the advantages of warmth, comfort, luster and elegance, which cannot be replaced by wet-process acrylic fiber. [0003] Generally speaking, in the production of acrylic fiber, a mark mixer is used to dissolve dry polyacrylonitrile powder at high temperature, but the amount of dry polyacrylonitrile powder used in this manuf...

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Problems solved by technology

[0003] Generally speaking, in the production of acrylic fiber, a mark mixer is used to dissolve dry polyacrylonitrile powder at high temperature, but the amount of dry polyacrylonitrile powder used in this manufacturing method is large, and the equipment investment is huge, which is not suitable for small and medium-sized dry-process acrylic fiber production. At the same time, as mentioned in "The Influence of the Quality of the Dry Acrylic Fiber Stock Solution on the Spinning Performance" by Chen Yadong et al. in the Journal of Ningbo Higher Technical College, Volume 13, No. 4, December 2001, the high temperature stirring and dissolving dry powder process is easy to produce dry powder Agglomerates make the stock solution easily block the filter cloth of the filter when it passes through the filter, and at the same time, problems such as parallel filaments are prone to occur when forming in the tunnel, resulting in defects, low strength, and poor spinnability of the obtained acrylic fiber tow. In the patent CN1172031C It is mentioned in the low temperature that polyacrylonitrile dry powder is firstly added to dimethylformamide, stirred at 0-10°C for 30 minutes, heated up, and stirred at 80°C for 4 hours. The disadvantage of this process is that it is easy to cause a large amount of Bubbles lead to poor spinnability of the stock solution, prone to problems such as broken filaments

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