High-shrinkage superfine acrylic fiber and preparation method thereof

Abstract

The invention relates to a high-shrinkage superfine acrylic fiber and a preparation method thereof. The high-shrinkage superfine acrylic fiber consists of 91-94 percent of acrylonitrile and 6-9 percent of vinyl acetate, wherein the fineness is 0.8-1.2dtex, and the shrinkage rate is 18-30 percent. The preparation method comprises the following steps: performing spinning forming, washing, drafting, oiling, drying, setting and performing high-shrinkage treatment. The prepared vivid cashmere-imitated high-shrinkage superfine acrylic fiber has excellent performances on strength, elongation, shrinkage rate, dyeing property, elasticity, glossiness, gas permeability and the like.

Description

technical field

[0001] The invention relates to an acrylic fiber and a preparation method thereof, in particular to a high-shrinkage superfine acrylic fiber and a preparation 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%. 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 natural fibers, and its textiles are widely used in clothing, decoration and other fields.

[0003] Ultrafine acrylic fiber has t...

Examples

Embodiment 1

[0034] Copolymerize 91% acrylonitrile and 9% vinyl acetate under the catalysis of persulfate and sulfite to make polypropylene dry powder with a molecular weight of 60,000-70,000, and dissolve the polypropylene dry powder in the solvent dimethyl formaldehyde A stock solution with a concentration of 20% is formed in the amide, and the stock solution is heated to 82°C by a heater, and the heated stock solution is extruded from the rectangular hole of the spinneret, and the as-spun fiber is formed by double diffusion in the coagulation bath; among them, entering The temperature of the stock solution in the coagulation bath is 80°C, the temperature of the coagulation bath is 30°C, the concentration of the coagulation bath is 30%, and the circulation volume is 28KL / h. The number of spinneret holes is 90000.

[0035] Washing and drafting: After washing the above-mentioned primary fibers, they are drawn by a drafting machine. During washing, the temperature of the water tank is 80°C,...

Embodiment 2

[0040] Copolymerize 92% acrylonitrile and 8% vinyl acetate under the catalysis of persulfate and sulfite to make polypropylene dry powder with a molecular weight of 70,000-80,000, and dissolve the polypropylene dry powder in the solvent dimethyl formaldehyde A stock solution with a concentration of 22% is formed in the amide, and the stock solution is heated to 84°C by a heater, and the heated stock solution is extruded from the rectangular hole of the spinneret, and the primary fiber is formed by double diffusion in the coagulation bath; among them, enter The temperature of the stock solution in the coagulation bath is 82°C, the temperature of the coagulation bath is 35°C, the concentration of the coagulation bath is 38%, and the circulation volume is 30KL / h. The number of spinneret holes is 100,000.

[0041] Washing and drawing: After washing the above-mentioned primary fibers, they are drawn by a drafting machine. During washing, the temperature of the water tank is 85°C, t...

Embodiment 3

[0046] Copolymerize 93% acrylonitrile and 7% vinyl acetate under the catalysis of persulfate and sulfite to make polypropylene dry powder with a molecular weight of 80,000-90,000, and dissolve the polypropylene dry powder in the solvent dimethyl formaldehyde A stock solution with a concentration of 23% is formed in the amide, and the stock solution is heated to 88°C by a heater, and the heated stock solution is extruded from the rectangular hole of the spinneret, and the as-spun fiber is formed by double diffusion in the coagulation bath; among them, entering The temperature of the stock solution in the coagulation bath is 88°C, the temperature of the coagulation bath is 40°C, the concentration of the coagulation bath is 50%, and the circulation volume is 32KL / h. The number of spinneret holes is 100,000.

[0047] Washing and drafting: After washing the above-mentioned primary fibers, they are drawn by a drafting machine. During washing, the temperature of the water tank is 88°...

technical field

[0001] The invention relates to an acrylic fiber and a preparation method thereof, in particular to a high-shrinkage superfine acrylic fiber and a preparation 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%. 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 natural fibers, and its textiles are widely used in clothing, decoration and other fields.

[0003] Ultrafine acrylic fiber has t...

Examples

Embodiment 1

[0034] Copolymerize 91% acrylonitrile and 9% vinyl acetate under the catalysis of persulfate and sulfite to make polypropylene dry powder with a molecular weight of 60,000-70,000, and dissolve the polypropylene dry powder in the solvent dimethyl formaldehyde A stock solution with a concentration of 20% is formed in the amide, and the stock solution is heated to 82°C by a heater, and the heated stock solution is extruded from the rectangular hole of the spinneret, and the as-spun fiber is formed by double diffusion in the coagulation bath; among them, entering The temperature of the stock solution in the coagulation bath is 80°C, the temperature of the coagulation bath is 30°C, the concentration of the coagulation bath is 30%, and the circulation volume is 28KL / h. The number of spinneret holes is 90000.

[0035] Washing and drafting: After washing the above-mentioned primary fibers, they are drawn by a drafting machine. During washing, the temperature of the water tank is 80°C,...

Embodiment 2

[0040] Copolymerize 92% acrylonitrile and 8% vinyl acetate under the catalysis of persulfate and sulfite to make polypropylene dry powder with a molecular weight of 70,000-80,000, and dissolve the polypropylene dry powder in the solvent dimethyl formaldehyde A stock solution with a concentration of 22% is formed in the amide, and the stock solution is heated to 84°C by a heater, and the heated stock solution is extruded from the rectangular hole of the spinneret, and the primary fiber is formed by double diffusion in the coagulation bath; among them, enter The temperature of the stock solution in the coagulation bath is 82°C, the temperature of the coagulation bath is 35°C, the concentration of the coagulation bath is 38%, and the circulation volume is 30KL / h. The number of spinneret holes is 100,000.

[0041] Washing and drawing: After washing the above-mentioned primary fibers, they are drawn by a drafting machine. During washing, the temperature of the water tank is 85°C, t...

Embodiment 3

[0046] Copolymerize 93% acrylonitrile and 7% vinyl acetate under the catalysis of persulfate and sulfite to make polypropylene dry powder with a molecular weight of 80,000-90,000, and dissolve the polypropylene dry powder in the solvent dimethyl formaldehyde A stock solution with a concentration of 23% is formed in the amide, and the stock solution is heated to 88°C by a heater, and the heated stock solution is extruded from the rectangular hole of the spinneret, and the as-spun fiber is formed by double diffusion in the coagulation bath; among them, entering The temperature of the stock solution in the coagulation bath is 88°C, the temperature of the coagulation bath is 40°C, the concentration of the coagulation bath is 50%, and the circulation volume is 32KL / h. The number of spinneret holes is 100,000.

[0047] Washing and drafting: After washing the above-mentioned primary fibers, they are drawn by a drafting machine. During washing, the temperature of the water tank is 88°...

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