Method for preparing acrylic fibre with wet-process

An acrylic fiber, wet-laid technology, applied in wet-spinning, spinneret assembly, filament generation, etc., can solve the problems of difficult to achieve product quality, low output, etc. Door pressure, easy diffusion effect

Inactive Publication Date: 2008-09-24
浙江杭州湾腈纶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] German Bayer wet two-step process, the number of holes in the spinneret used in the production of 1.67dtex in this process is 60,000 holes, the total denier of a single tow is 80ktex, the output is relatively small, only 1.43 tons per hour for a single thread, Moreover, in terms of the requirements of downstream users, some quality aspects of the product are difficult to meet

Method used

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  • Method for preparing acrylic fibre with wet-process
  • Method for preparing acrylic fibre with wet-process

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Embodiment

[0023] Embodiment: the preparation method of the wet-process acrylic fiber in the present embodiment: comprise the steps successively:

[0024] a. Spinning forming: take polyacrylonitrile dry powder (PAN) as raw material, and use dimethylacetamide (DMAC) as solvent to prepare a polymer stock solution with a mass percentage concentration of 23 to 26%, preferably 24.5%. After being heated by a heater, it is extruded from the hole on the spinneret to form a monofilament. The temperature of the heater is controlled at 120-130°C, preferably 125°C, and the pre-spinning pressure is controlled at 450-550Kpa, preferably 500kpa. The bath temperature is 45-49°C, preferably 47°C, the mass percentage concentration of dimethylacetamide in the coagulation bath is 51-54%, preferably 52.3%, and the circulation rate of the coagulation bath is 30000-40000kg / h, preferably 34105kg / h Preferably, as-spun fibers are produced;

[0025] b. Washing and drawing: the as-spun fiber is passed through 8 was...

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Abstract

A preparation method for wet acrylic fiber is characterized by including the following steps in turn: a, spinning and shaping; b, washing and drafting; c, oiling; d, drying; e, winding; f, shaping. Furthermore, compared with the prior art, the invention makes improvement on the shaping technique and post treatment technique through the specific design of a silk spray plate and selects proper spinning, shaping and post treatment condition technique parameters through a plurality of tests to improve the coagulation bath circulation amount, improve the adding amount and the drafting times of an oil agent and improve the winding door pressure. The acrylic fiber manufactured by the invention improves the shaping effect of the fiber.

Description

technical field [0001] The invention relates to a preparation method of wet-process acrylic fiber. Background technique [0002] Acrylic fiber is the trade name of polyacrylonitrile fiber in our country. Acrylic has excellent performance, soft and warm to the touch, and has good elasticity. Light fastness and weather resistance are particularly good. Generally made into short fibers. Available pure or blended with wool. It is used to make textiles, knitwear, blankets, tents, curtains and filter cloths, etc. Because its properties are close to wool, it is called "synthetic wool". Although acrylic fibers are usually called polyacrylonitrile fibers, acrylonitrile (customarily called the first monomer) only accounts for 90% to 94%, the second monomer accounts for 5% to 8%, and the third monomer is 0.3% to 2.0%. %. This is due to the lack of flexibility, brittleness and difficulty in dyeing fibers made from mono-acrylonitrile polymers. In order to overcome these shortcomin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/06D01D10/06D01D11/00D01D4/02D02G1/00D02J13/00D06C7/02D01F6/18
Inventor 李春友
Owner 浙江杭州湾腈纶有限公司
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