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Preparation method for acetate fiber through dry-wet process

A technology for cellulose acetate and cellulose acetate, which is applied in the field of dry and wet preparation of cellulose acetate, can solve the problems of poor mechanical properties of cellulose acetate fibers, environmental pollution, and high production costs, and achieves improvements in plant area environmental protection indicators, and increases in application fields, The effect of low product cost

Inactive Publication Date: 2014-09-10
NANTONG CELLULOSE FIBERS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Purpose of the invention: the present invention provides a dry-wet method for preparing cellulose acetate, which solves the problems of poor mechanical properties, high production cost and serious environmental pollution of cellulose acetate produced in the prior art

Method used

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  • Preparation method for acetate fiber through dry-wet process

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] As shown in the attached figure, use glacial acetic acid containing 10% water as a solvent, prepare a solution with a concentration of 18% from cellulose acetate sheets with a degree of substitution of 2.0 and a degree of polymerization of 500, and add it to a dissolution kettle with a stirrer and a thermometer , dissolved at room temperature for 4 hours, vacuum defoaming; through the filter device and metering pump, extruded from the spinneret hole, the distance between the spinneret surface and the coagulation bath was set at 100mm; the solution extruded from the spinneret was fine After flowing through a section of air layer with a distance of 100mm, it passes through the coagulation bath. The content of glacial acetic acid in the coagulation bath is 10%, and the temperature of the coagulation bath is 40°C. The solvent in the solution trickle diffuses to the coagulation bath, and the coagulant in the bath diffuses to the inside of the trickle, so the polymer is precip...

Embodiment 2

[0026] Use glacial acetic acid containing 5% water as solvent, prepare a solution with a concentration of 22% from cellulose acetate sheets with a degree of substitution of 2.5 and a degree of polymerization of 550, add it to a dissolution kettle with a stirrer and a thermometer, and dissolve it at 20°C 3h, vacuum defoaming; through the filter device and metering pump, extrude from the spinneret hole, the distance between the spinneret surface and the coagulation bath is set at 130mm; the solution squeezed out from the spinneret passes through this section After the air layer enters and passes through the coagulation bath for 2 seconds, the content of glacial acetic acid in the coagulation bath is 15%, the temperature of the coagulation bath is 50°C, and the polymer is precipitated in the coagulation bath to form acetate fiber; then stretching is carried out at an elongation rate of 40%. The monofilament linear density of the obtained acetate filament is 7.0dtex, the breaking s...

Embodiment 3

[0028] As shown in the attached figure, use glacial acetic acid with a water content of 15% as a solvent, prepare a solution with a concentration of 12% from cellulose acetate particles with a degree of substitution of 2.9 and a degree of polymerization of 600, and add it to a dissolution kettle with a stirrer and a thermometer , dissolved at 30°C for 6 hours, vacuum defoaming; through the filter device and metering pump, extruded from the spinneret hole, the solution extruded from the spinneret passed through a section of air layer with a distance of 200mm, and then immersed in the coagulation bath 5 seconds (5s). The content of glacial acetic acid in the coagulation bath is 20%, and the temperature of the coagulation bath is 20°C. The solvent in the solution trickle diffuses to the coagulation bath, and the coagulant in the bath diffuses to the inside of the trickle, so the polymer is precipitated in the coagulation bath to form acetate fiber. Then stretching treatment is c...

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Abstract

The invention discloses a preparation method for acetate fiber through a dry-wet process. The preparation method comprises: taking glacial acetic acid with the water content of 1-15% as a solvent, preparing a solution of acetate fiber with the concentration of 12%-24%, wherein the acetate fiber has the substitution degree of 2.0-2.9 and the polymerization degree of 300-800, stirring at 30-80 DEG C for 2-6 h for dissolving, so as to form a cellulose acetate spinning solution; extruding the deaerated spinning solution through a spinning head, making through an air layer with the thickness of 50-500 mm and sending into coagulation bath with a temperature of 20-60 DEG C, so as to form nascent fiber; and then performing stretching, water washing, drying, oiling and other post-treatment technologies, so as to prepare an acetate fiber finished product. The preparation method is used to produce acetate fiber, the finished product has relatively high polymerization degree, relatively good mechanical properties and relatively wide application fields, also production-equipment investment is relatively low and pollution is relatively less in the production process.

Description

technical field [0001] The invention relates to a production process and a production method of cellulose acetate. Background technique [0002] Acetate fiber, also known as cellulose acetate fiber, is one of the earliest chemical fibers developed in the world, and is currently the second largest variety of regenerated cellulose fiber after viscose fiber. Compared with regenerated cellulose fibers such as viscose and tencel, its performance is closer to that of mulberry silk. The color dyed with disperse dyes is bright, high color fastness, low moisture regain, good elasticity, not easy to wrinkle, and has good drapability, thermoplasticity, and dimensional stability, but it also has the disadvantage of low mechanical strength; in addition Post-processing technologies such as deformation and weaving are relatively difficult, which has affected its application and promotion in textiles; moreover, the durability of acetate fabrics is poor, which is why the consumption of acet...

Claims

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Application Information

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IPC IPC(8): D01F2/02
Inventor 张丽宋俊张淑洁黄骅曹建华李娇王跃飞
Owner NANTONG CELLULOSE FIBERS CO LTD
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