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High-shrinkage flat acrylic fiber and production method thereof

A technology of acrylic fiber and production method, applied in the field of high-shrinkage flat acrylic fiber and its production, can solve the problems of inability to meet user requirements, the hand feeling of the finished product is not plump, and the variability of acrylic fiber knitting, etc., to achieve strong rigidity, increased softness and hand feel , the effect of good spinnability

Active Publication Date: 2014-06-25
NINGBO ZHONGXIN ACRYLIC FIBERS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no technology to produce flat acrylic fibers with high shrinkage in China, and most of the related products are imported from abroad.
However, the technology of producing high-shrinkage ordinary acrylic fibers is completely used to produce high-shrinkage flat fibers, the fibers are easy to break, the shrinkage rate is uneven, and the shrinkage rate can only reach below 24%.
If the shrinkage rate is low, the finished product will not feel plump and exposed, the product style will not be good, the residual deformation will be large after repeated stretching, and the cuffs and necklines of acrylic knitted fabrics will be variable, which cannot meet user requirements.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • High-shrinkage flat acrylic fiber and production method thereof

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Effect test

Embodiment 1

[0038] Embodiment 1: Preparation of 3D high shrinkage flat fiber

[0039] Spinning forming: Copolymerize 91-94% of acrylonitrile and 6-9% of vinyl acetate under the catalysis of persulfate and sulfite to make polyacrylonitrile dry powder with a molecular weight of 60,000-100,000. The acrylonitrile dry powder is dissolved in the solvent dimethylacetamide to form a stock solution with a concentration of 20-25%. The stock solution is heated to 82-90°C by a heater, and the heated stock solution is extruded from the rectangular hole of the spinneret. In the coagulation bath, primary fibers are formed by double diffusion; wherein, the temperature of the stock solution when entering the coagulation bath is 80-90°C, the temperature of the coagulation bath is 30-45°C, and the concentration of the solvent dimethylacetamide in the coagulation bath is 30- 50%, the circulation volume is 28-35kL / h. The spinneret is a rectangular plate with a length of 113 mm and a width of 55 mm. The lengt...

Embodiment 2

[0044] Embodiment 2: Preparation of 5D high shrinkage flat fiber

[0045] Spinning forming: Copolymerize 91-94% of acrylonitrile and 6-9% of vinyl acetate under the catalysis of persulfate and sulfite to make polyacrylonitrile dry powder with a molecular weight of 60,000-100,000. The acrylonitrile dry powder is dissolved in the solvent dimethylacetamide to form a stock solution with a concentration of 20-25%. The stock solution is heated to 82-90°C by a heater, and the heated stock solution is extruded from the rectangular hole of the spinneret. In the coagulation bath, primary fibers are formed by double diffusion; wherein, the temperature of the stock solution when entering the coagulation bath is 80-90°C, the temperature of the coagulation bath is 30-45°C, and the concentration of the solvent dimethylacetamide in the coagulation bath is 30- 50%, the circulation volume is 28-35kL / h. The spinneret is a rectangular plate with a length of 113mm and a width of 55mm. The length ...

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Abstract

The invention relates to a high-shrinkage flat acrylic fiber. The high-shrinkage flat acrylic fiber consists of the following components in percentage by weight: 91-94 percent of acrylonitrile and 6-9 percent of vinyl acetate, wherein the length-width ratio of the flat acrylic fiber is (2-13):1, and the shrinkage rate is 26-30 percent. The method for producing the flat acrylic fiber comprises the following steps: carrying out copolymerization reaction on the acrylonitrile and the vinyl acetate to prepare dried polyacrylonitrile powder, dissolving the powder in a solvent, extruding from a rectangular hole of a spinneret plate after heating, and performing double diffusion to form a nascent fiber; washing the nascent fiber by water, and drawing the fiber through a drawing machine; feeding an oiling agent; drying and setting; and finally, drawing to prepare the high-shrinkage flat acrylic fiber. The contents of the acrylonitrile and the vinyl acetate in a copolymer, the molecular weight of the copolymer and a specific process flow are adjusted, so that the prepared high-shrinkage flat acrylic fiber is good in handfeel, the softness of the fiber can be improved, the high shrinkage, rebound resilience, hydrophobicity and spinnability of the fiber can be guaranteed, and the acrylic fiber is easy to color.

Description

technical field [0001] The invention relates to a flat acrylic fiber, in particular to a high-shrinkage flat acrylic fiber and a production method thereof. Background technique [0002] Acrylic fiber (polyacrylonitrile fiber) is known as artificial wool. It has the advantages of softness, bulkiness, easy dyeing, bright color, light resistance, antibacterial, and not afraid of insects. It has good elasticity, and the rebound rate can still maintain 65% when it is stretched by 20%. It is fluffy, curly and soft. Its warmth retention is 15% higher than that of wool, and its strength is 1.8-4.5cN / dtex, which is 1-2.5 times higher than wool. Excellent light fastness, the strength will only decrease by 20% after being exposed to the sun for one year. The softening temperature of fiber is 190-230℃, it can resist acid, oxidant and general organic solvent, but its alkali resistance is poor. According to different application requirements, it can be purely spun or blended with natura...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/38C08F220/44C08F218/08D01D5/06D01D10/06D01D10/02
Inventor 邱海昌张娟韩顺利孙晓波李滨
Owner NINGBO ZHONGXIN ACRYLIC FIBERS
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