Preparation method of flat fibers

A flat fiber, dry-spraying-wet technology, applied in fiber processing, wet spinning, stretch spinning, etc., can solve problems such as affecting fiber plasticity, not meeting environmental protection requirements, and failing to achieve controllable fiber flatness adjustment. , to achieve the effect of controllable fiber cross-sectional shape and saving power consumption

Inactive Publication Date: 2013-07-24
DONGHUA UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] The spinning method of above-mentioned polymer fiber, what a part of spinning method obtains is the common fiber that cross section shape is circular or close to circle; The spinning method of another part of polymer, although obtained flat shape fiber, can only pass through Special-shaped spinneret holes, such as the preparation of straight spinneret holes, and the production of special-shaped spinneret plates consume a lot of manpower and material resources, which do not meet the environmental protection requirements of energy saving and emission reduction
[0008] 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. The fiber shaping adjustment process can be used to obtain fibers with special-shaped cross-sections.

Method used

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  • Preparation method of flat fibers
  • Preparation method of flat fibers
  • Preparation method of flat fibers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The preparation method of flat polyacrylonitrile fiber:

[0040] Polyacrylonitrile homopolymer with a viscosity average molecular weight of 4.4×10 4 .

[0041]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 a circular spinneret hole with a diameter of 0.7mm, and then enters the first coagulation bath with a temperature of 20°C, a concentration of 40wt% dimethylacetamide and the rest of water, and 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 filament is 40wt%; Stretching by coagulation for 2 times; drawing by boiling water at 100°C, and drying by 1.01 times at 100°C to prepare flat polyacrylonitrile fibers.

[0042] Product performance indicators:

[0043] Breaking strength: 3.0cN / dtex;

[0044] Elongatio...

Embodiment 2

[0048] The preparation method of flat polyacrylonitrile fiber:

[0049] 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 .

[0050] 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 a circular spinneret hole with a diameter of 0.8mm and enters the first coagulation bath with a temperature of 20°C, a concentration of 40wt% dimethylformamide and the rest of water, and the residence time in the coagulation bath is 80s , the draw ratio of the spinneret is 6 times, and the solvent content in the coagulation bath filament is 25wt%; Stretching by coagulation for 2.6 times; drawing by boiling water at 100°C, and dryin...

Embodiment 3

[0057] The preparation method of flat polyacrylonitrile fiber:

[0058] 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 .

[0059] 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 a circular spinneret hole with a diameter of 0.2mm and enters the first coagulation bath with a temperature of 0°C, a concentration of 50wt% dimethyl sulfoxide and the rest of water, and the residence time in the coagulation bath is 50s , the draw ratio of the spinneret is 10 times, and the solvent content in the coagulation bath filament is 28wt%; Stretching by coagulation for 3.5 times; drawing by boiling water a...

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Abstract

The invention relates to a preparation method of flat fibers. The dry-spraying wet spinning technology is adopted, after squeezed out through round spinneret orifices, spinning solution enters a first coagulating bath, the drawing ratio of a spinneret is 2-10 times, the solvent content in strands out of the coagulating bath is 25-50 wt%, then the spinning solution is drawn in a coagulating mode in a second coagulating bath, the coagulating drawing is that drawing is carried out in the process of continuous coagulating of the spinning solution, through washing, the drying and drawing are carried out on the spinning solution to prepare and obtain the flat fibers. The prepared flat fibers have excellent performance and are characterized in respects such as gloss, elasticity, anti-pilling performance, bulkiness and hand feel, due to good rigidity of the flat fibers, when used as filtering material, the flat fibers can form an airflow channel, wherein the size and the form of the airflow channel can not be achieved through common round-section fibers, and the flat fibers have great development space in the application field of special requirements.

Description

technical field [0001] The invention relates to a method for preparing flat fibers. Background technique [0002] The applicant / patentee applied for a related invention patent for Mitsubishi Rayon Co., Ltd.: JP02-169712 "Production of dry spun flat acrylic fiber (dry method for preparing flat acrylic fiber)", which involves a natural animal hair gloss , hand-feeling fibers with a flat cross-section, suitable for making clothes by spinning acrylonitrile in the dry process. The spinning solution is dry-spun through a spinneret with a plurality of rectangular holes, and the ratio of the long side to the short side of the spinneret is 4:1. [0003] The German invention DE3040970 "Processes for the production of dry-spun polyacrylonitrile profiled fibers and filaments (method for preparing polyacrylonitrile profiled fibers by dry method)" applied by Bayer in Germany discloses a method for preparing acrylonitrile profiled fibers by dry process , the area of ​​the special-shaped ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D5/253D01D5/06D01D5/16
Inventor 董葳于金超杨春雷杨曦杨利伟张玉梅王华平
Owner DONGHUA UNIV
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