Acrylic fibers with peanut-shaped cross section and production method thereof

A technology of acrylic fiber and production method, which is applied in the directions of fiber processing, fiber chemical characteristics, wet spinning method, etc., can solve the problem that it is difficult to ensure the uniformity of fiber tows, the time for adjusting the movement of polymer molecular chains is short, and the spinneret holes Problems such as small hole spacing, to achieve superior moisture wicking ability, good capillary effect, and the effect of improving bulkiness

CN106435802AInactive Publication Date: 2017-02-22NINGBO ZHONGXIN ACRYLIC FIBERS
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-02-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses acrylic fibers with a peanut-shaped cross section. The acrylic fibers with the peanut-shaped cross section are mainly prepared from the following components in percentage by mass: 91 percent to 94 percent of acrylonitrile and 6 percent to 9 percent of vinyl acetate. The acrylic fibers with the peanut-shaped cross section are obtained by extruding through a spinneret plate and the length-width ratio of the section is (3 to 5) to 2. The invention further discloses a production method of the acrylic fibers with the peanut-shaped cross section; the production method comprises the following steps: carrying out a copolymerization reaction on the acrylonitrile and the vinyl acetate and then forming a raw spinning solution in a solvent; heating the raw spinning solution to 82 DEG C to 90 DEG C and extruding from the spinneret plate; forming as-spun fibers in a condensation bath; carrying out water washing and drafting on the as-spun fibers to form a fiber bundle; and carrying out oil application, drying and sizing on the fiber bundle to obtain the acrylic fibers with the peanut-shaped cross section. According to the acrylic fibers with the peanut-shaped cross section, the content of the acrylonitrile and the vinyl acetate in a copolymer and the molecular weight of the copolymer are adjusted, the spinneret plate is reasonably designed and a production process is adjusted, so that the prepared acrylic fibers have excellent performances.
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Description

technical field

[0001] The invention relates to an acrylic fiber, in particular to an acrylic fiber with a peanut-shaped section 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, and its warmth retention is 15% higher than that of wool. The strength is 1.8-4.5cN / dtex, which is 1-2.5 times higher than wool. The light fastness performance is excellent, and the strength will only decrease by 20% after being exposed to the open air 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 ...

Examples

Embodiment 1

[0041] The method for producing peanut type section acrylic fiber comprises the steps:

[0042] S1: Spinning forming: the polyacrylonitrile dry powder with a molecular weight of 60000-80000 is obtained by copolymerizing acrylonitrile with a mass percentage of 91% and vinyl acetate with a mass percentage of 9%, and the dry polyacrylonitrile powder is dissolved in dimethyl acetonitrile A spinning stock solution with a mass percentage concentration of 23% is formed in the amide solvent, and the spinning stock solution is heated to 82°C and extruded from the holes of the spinneret, and formed into nascent fibers by double diffusion in the coagulation bath;

[0043] Wherein, the temperature when the spinning dope enters the coagulation bath is 80°C, the temperature of the coagulation bath is 30°C, the concentration of dimethylacetamide solvent in the coagulation bath is 45%, and the circulation rate is 30kL / h;

[0044] The spinneret is a rectangular plate or a circular plate, made ...

Embodiment 2

[0049] The method for producing peanut type section acrylic fiber comprises the steps:

[0050] S1: Spinning forming: the polyacrylonitrile dry powder with a molecular weight of 70000-90000 is prepared by copolymerizing acrylonitrile with a mass percentage of 92% and vinyl acetate with a mass percentage of 8%, and the dry polyacrylonitrile powder is dissolved in dimethyl acetonitrile A spinning stock solution with a mass percentage concentration of 24% is formed in the amide solvent, and the spinning stock solution is heated to 84°C and extruded from the holes of the spinneret, and formed into nascent fibers by double diffusion in the coagulation bath;

[0051] Among them, the temperature of the spinning dope entering the coagulation bath is 86°C, the temperature of the coagulation bath is 32°C, the concentration of dimethylacetamide solvent in the coagulation bath is 48%, and the circulation volume is 31kL / h;

[0052] The spinneret is a rectangular plate or a circular plate, ...

Embodiment 3

[0057] The method for producing peanut type section acrylic fiber comprises the steps:

[0058] S1: Spinning forming: the polyacrylonitrile dry powder with a molecular weight of 80,000-100,000 is obtained by copolymerizing acrylonitrile with a mass percentage of 94% and vinyl acetate with a mass percentage of 7%, and the dry polyacrylonitrile powder is dissolved in dimethyl acetonitrile. A spinning stock solution with a mass percentage concentration of 25% is formed in the amide solvent, and the spinning stock solution is heated to 86°C and extruded from the holes of the spinneret, and formed into nascent fibers by double diffusion in the coagulation bath;

[0059] Wherein, the temperature of the spinning dope entering the coagulation bath is 90°C, the temperature of the coagulation bath is 36°C, the concentration of dimethylacetamide solvent in the coagulation bath is 50%, and the circulation volume is 33kL / h;

[0060] The spinneret is a rectangular plate or a circular plate,...