Wet spinning method for preparing cellulose acetate fiber

A technology for cellulose acetate and wet spinning, applied in the field of spinning, can solve the problems of incapable of large-scale production and application, high energy consumption, expensive ionic solvent, etc., achieves excellent indicators, good mechanical properties, and improves production environment. Effect

Active Publication Date: 2016-10-12
吉林富博纤维研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionic solvents used in these two inventions are expensive, have high energy consumption, and cannot be used in large-scale production

Method used

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  • Wet spinning method for preparing cellulose acetate fiber
  • Wet spinning method for preparing cellulose acetate fiber
  • Wet spinning method for preparing cellulose acetate fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) the degree of esterification of 5kg granular blocks is 2.1, and the cellulose diacetate with a water content of 1% is ground into powder;

[0038] (2) Add cellulose diacetate powder and 30kg of DMAC solvent into the dissolution tank, stir and mix thoroughly, heat up and dissolve, the dissolution temperature is 35°C, and the dissolution time is 8 hours;

[0039] (3) After degassing and filtering, the spinning stock solution is formed;

[0040] (4) The spinning stock solution at 15°C is sprayed out from the spinneret hole after being passed through a metering pump and a filter, and enters a coagulation bath, which is a DMAC aqueous solution with a concentration of 25% and a temperature of 20°C to form nascent fibers;

[0041] (5) As-spun fibers are drawn, washed, oiled, dried, wound, and graded to form acetate fiber finished products, and the total draft ratio of the drafting process is 0.5.

[0042] The index of the obtained acetate fiber finished product: the dry str...

Embodiment 2

[0044] (1) the degree of esterification of 5kg grains is 2.8, and the cellulose diacetate with a water content of 7% is ground into powder;

[0045] (2) Add cellulose diacetate powder and 35kg of DMAC solvent into the dissolution tank, stir and mix thoroughly, heat up and dissolve, the dissolution temperature is 100°C, and the dissolution time is 0.5 hours;

[0046] (3) After degassing and filtering, the spinning stock solution is formed;

[0047] (4) The spinning stock solution at 100°C is sprayed out from the spinneret hole after being passed through a metering pump and a filter, and enters a coagulation bath, which is a DMAC aqueous solution with a concentration of 70% and a temperature of 90°C to form primary fibers;

[0048] (5) As-spun fibers are drawn, washed, oiled, dried, wound, and graded to form acetate fiber finished products, and the total draft ratio of the drafting process is 7.

[0049] The index of the obtained acetate fiber finished product: the dry strength...

Embodiment 3

[0051] (1) the degree of esterification of 10kg grains is 2.5, and the cellulose diacetate with a water content of 4% is ground into powder;

[0052] (2) Add cellulose diacetate powder and 35kg DMF solvent into the dissolving tank, fully stir and mix, heat up and dissolve, the dissolving temperature is 40°C, and the dissolving time is 3 hours;

[0053] (3) After degassing and filtering, the spinning stock solution is formed;

[0054] (4) The spinning dope at 40°C is sprayed out from the spinneret hole after being passed through a metering pump and a filter, and enters a coagulation bath, which is a DMF aqueous solution with a concentration of 30% and a temperature of 25°C to form primary fibers;

[0055] (5) As-spun fibers are drawn, washed, oiled, dried, wound, and graded to form acetate fiber finished products, and the total draft ratio of the drafting process is 1.

[0056] The index of the obtained acetate fiber finished product: the dry strength is 2.0CN / dtex, the wet st...

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Abstract

The invention discloses a wet spinning method for preparing cellulose acetate fiber. The wet spinning method comprises the following steps: grinding solid cellulose diacetate, of which the degree of acetylation is 2.1 to 2.8 and the water content is 1 to 7 percent, into powder; adding the cellulose diacetate powder and an organic solvent into a dissolving tank, and carrying out sufficient stirring for mixing, and raising the temperature for dissolution, wherein the mass ratio of the cellulose diacetate powder to the organic solvent ranges from 1:3 to 1:7, the dissolving time is 0.5 to 8 hours, and the dissolving temperature is 35 to 120 DEG C; filtering and deforming a dope obtained after dissolution to obtain a spinning dope; after the spinning dope passes through a metering pump and a filter, spraying the filtered spinning dope from spinneret orifices to enter a coagulation bath to obtain nascent fiber, wherein the concentration of the coagulation bath is 25 to 70%, and the temperature is 20 to 90 DEG C; preparing a finished acetate fiber product from the nascent fiber through drafting, washing, oiling and drying. The cellulose acetate fiber prepared according to the method disclosed by the invention has excellent indexes, good mechanical properties, and remarkably improved dry strength and wet strength; the preparation process is simple, feasible, and easy to control; the solvent cost is low.

Description

technical field [0001] The invention belongs to the field of spinning, and in particular relates to a preparation method of acetate fiber by wet spinning. Background technique [0002] Cellulose acetate is one of the most important varieties of cellulose derivatives. It is mainly obtained through acetylation of cellulose with cotton or wood as raw material. The hydroxyl groups on the cellulose macromolecular chain are replaced by acyl groups, so it is also called acetyl cellulose. The currently widely used cellulose acetates are cellulose diacetate with a degree of substitution of 2.22-2.76 and cellulose triacetate with a degree of substitution of 2.76-3 (ISO / FDIS 2076:1999 (E) defines cellulose acetate). On the one hand, the introduction of acyl group weakens the hydrogen bond force between the macromolecular chains of cellulose acetate and between the macromolecular chains; Physical and chemical properties. [0003] Fiber acetate can be obtained by dissolving and spinni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/28
CPCD01F2/28
Inventor 刘海亮宋德武刘鹏高嘉徵袁保福刘畅孟祥化张弘李晓明
Owner 吉林富博纤维研究院有限公司
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