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A kind of preparation method of highly flat fiber

A flat fiber, high-level technology, applied in fiber processing, wet spinning, stretch spinning, etc., can solve the problems of affecting fiber plasticity, not meeting the environmental protection requirements of energy saving and emission reduction, and consuming a lot of manpower and material resources, etc., to achieve fiber cross-section The shape is controllable and the effect of saving power consumption

Inactive Publication Date: 2015-10-21
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above fiber spinning methods are all through the improvement of special-shaped spinneret holes (such as in-line or oval spinneret holes) to prepare highly flat fibers with greater flatness, and the production of special-shaped spinneret consumes a lot of time. Manpower and material resources do not meet the environmental protection requirements of energy saving and emission reduction
[0012] It can be seen that in the existing polymer spinning technology, there is no simultaneous control of the degree of coagulation in the coagulation bath after the spinning solution is extruded from the spinneret hole and the drafting speed of the filaments exiting the coagulation bath. The spinning process adjustment achieves controllable technology. The coagulation degree of the spinning solution filament in the coagulation bath affects the plasticity of the fiber, and the fiber shaping adjustment process can be used to obtain highly flat fibers.

Method used

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  • A kind of preparation method of highly flat fiber
  • A kind of preparation method of highly flat fiber
  • A kind of preparation method of highly flat fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Preparation method of highly flat polyacrylonitrile fiber:

[0044] Polyacrylonitrile homopolymer with a viscosity average molecular weight of 4.4×10 4 .

[0045] The composition of the polymer solution is: 25wt% polyacrylonitrile homopolymer, 75wt% dimethylacetamide; the apparent viscosity of the spinning solution at 40°C is 110Pa·s. The polymer solution is extruded through an elliptical spinneret hole with a major axis of 0.7mm and a ratio of major to minor axis of 5, and then enters the first coagulation bath with a temperature of 20°C, a concentration of 40wt% dimethylacetamide and the remainder of water. The residence time in the coagulation bath is 20s, the draw ratio of the spinneret is 2 times, and the solvent content in the coagulation bath filaments is 40wt%; Coagulation and stretching in the second coagulation bath of water for 2 times; then drawing in boiling water at 100°C, and drying and stretching at 100°C for 1.01 times to prepare highly flat polyacryl...

Embodiment 2

[0052] Preparation method of highly flat polyacrylonitrile fiber:

[0053] Acrylonitrile copolymer: the first monomer is polyacrylonitrile with a content of 85wt%; the second monomer is methyl acrylate with a content of 7wt%; the third monomer is itaconic acid with a content of 8wt%. The viscosity average molecular weight is 6.5×10 4 .

[0054] The composition of the polymer solution is: 30wt% acrylonitrile copolymer, 70wt% dimethylformamide; the apparent viscosity of the spinning solution at 40°C is 320Pa·s. The polymer solution is extruded through an inline spinneret hole with a length of 0.8mm and an aspect ratio of 2, and then enters the first coagulation bath with a temperature of 20°C, a concentration of 40wt% dimethylformamide and the rest of water, and is coagulated The residence time in the bath is 80s, the draw ratio of the spinneret is 6 times, and the solvent content in the silk strands exiting the coagulation bath is 25wt%; Coagulate and stretch 2.6 times in th...

Embodiment 3

[0061] Preparation method of highly flat polyacrylonitrile fiber:

[0062] Acrylonitrile copolymer: the first monomer is polyacrylonitrile with a content of 88wt%; the second monomer is methyl methacrylate with a content of 7wt%; the third monomer is sodium propylene sulfonate with a content of 5wt%. The viscosity average molecular weight is 2.5×10 5 .

[0063] The composition of the polymer solution is: 5wt% acrylonitrile copolymer, 95wt% dimethyl sulfoxide; the apparent viscosity of the spinning solution at 40°C is 270Pa·s. The polymer solution is extruded through an elliptical spinneret hole with a major axis of 0.2mm and a ratio of major to minor axis of 8, and then enters the first coagulation bath with a temperature of 0°C, a concentration of 50wt% dimethyl sulfoxide and the rest of water. The residence time in the coagulation bath is 50s, the draw ratio of the spinneret is 10 times, and the solvent content in the silk strands exiting the coagulation bath is 28wt%; Co...

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Abstract

The invention relates to a preparation method for highly flat fibers, which adopts dry jet wet spinning process, spinning solution enters into a first precipitating bath after being squeezed out through an elliptical or linear shaped spinneret hole, the extension ratio of a spinneret is 2 to 10 times, and the content of solvent in the filament of the precipitating bath is 25 to 50 wt percent; then solidification and stretching are performed inside a second precipitating bath, and the solidification and stretching refer to stretching is performed during a continued solidification process; and then after water washing, drying and stretching are performed, and the highly flat fibers can be prepared. The highly flat fibers prepared in the invention has the characteristic of excellent performance on aspects of luster, elasticity, anti-pilling, fluffiness, hand feeling and the like, the highly flat fibers can form an airflow passage with dimension and form which cannot be achieved by a common round section when being used as filtering material, and has a great development space in the application field having special requirements.

Description

technical field [0001] The invention relates to a method for preparing highly flat fibers. Background technique [0002] Japanese patent JP08-260234 " flattened アクリル series silk fiber " discloses a kind of flat acrylic fiber with good elasticity, nerves and fluffy. Flatness: 5~25, fineness: 0.5~40denier. [0003] Japanese patent JP02-169712 "Production of dry spun flat acrylic fiber (dry method for preparing flat acrylic fiber)" relates to a fiber with natural animal hair luster and feel, and the cross section is particularly flat. The spinning solution is dry-spun through a spinneret with a plurality of rectangular holes, the ratio of the long side to the short side of the spinneret is 4:1, and the distance between 3 or more holes in the straight line distance of the long side is 1~ 0.3mm. [0004] The German invention DE3040970 "Processes for the production of dry-spun polyacrylonitrile profiled fibers and filaments (method for preparing polyacrylonitrile profiled fiber...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D5/253D01D5/06D01D5/12
Inventor 董葳夏晓林姚勇波易志文巩明方程海明张恩杰张玉梅王华平
Owner DONGHUA UNIV
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