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Preparation method of cellulose diacetate fiber

A technology of cellulose diacetate and fiber, which is applied in the field of preparation of cellulose diacetate fiber, can solve the problems of low substitution degree of cellulose acetate fiber, low fiber tensile strength, poor mechanical properties, etc., and improve the production environment , improved tensile strength and simple preparation process

Inactive Publication Date: 2011-11-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The technical problem to be solved by this invention is to provide a kind of preparation method of cellulose diacetate fiber, especially provide a kind of method that carries out dry-jet wet spinning with ionic liquid as solvent to prepare cellulose diacetate, to solve the problem of existing technology In the process of dry spinning of cellulose diacetate, there are problems such as low fiber tensile strength, poor mechanical properties, low degree of substitution in the preparation of cellulose acetate fibers using ionic liquid as a solvent, and low fiber strength.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Dissolve cellulose diacetate with a degree of substitution of 2.5 and a degree of polymerization of 600 in 1-butyl-3-methylimidazole chloride to form a uniform and stable spinning dope; the cellulose diacetate The mass ratio to the ionic liquid is 1:2;

[0028] The temperature of the dissolution is 130°C;

[0029] (2) Dry-jet wet-spinning the spinning dope to obtain the cellulose diacetate fiber with a monofilament fineness of 1.5 dtex and a breaking strength of 2.5 cN / dtex; the spinning temperature of the dry-jet wet spinning is 105°C; The coagulation bath temperature of the dry-jet wet spinning is 10°C; the dry-jet wet spinning has two washings, the first washing temperature is 65°C, and the second washing temperature is 100°C; The distance from the spinneret to the coagulation bath in the air is 80mm; the spinning speed is 150m / min, and the drafting ratio is 15 times.

Embodiment 2

[0031] (1) Dissolve cellulose diacetate with a degree of substitution of 2 and a degree of polymerization of 200 in 1-butyl-3-methylimidazole bromide to form a uniform and stable spinning dope; the cellulose diacetate The mass ratio to the ionic liquid is 1:20;

[0032] The temperature of the dissolution is 70°C;

[0033] (2) The spinning dope is subjected to dry-jet wet spinning to obtain the cellulose diacetate fiber with a monofilament fineness of 3.0 dtex and a breaking strength of 1.5 cN / dtex; the spinning temperature of the dry-jet wet spinning is 70°C; The coagulation bath temperature of the dry-jet wet spinning is 0°C; the dry-jet wet spinning has two washing stretches, the temperature of the first washing stretch is 50°C, and the temperature of the second washing is 90°C; The distance of the silk dope from exiting the spinneret to entering the coagulation water bath in the air is 10mm; the spinning speed is 10m / min, and the drafting ratio is 2 times.

Embodiment 3

[0035] (1) Dissolve cellulose diacetate with a degree of substitution of 2.35 and a degree of polymerization of 300 in the ionic liquid 1-ethyl-3methylimidazole acetate to form a uniform and stable spinning dope; the diacetic acid The mass ratio of cellulose to the ionic liquid is 1:9; the dissolution temperature is 90°C;

[0036] (2) The spinning dope is subjected to dry jet wet spinning to obtain the cellulose diacetate fiber with a monofilament fineness of 5.0 dtex and a tensile strength of 2.0 cN / dtex; the spinning temperature of the dry jet wet spinning is 90°C The coagulation bath of the dry-jet wet spinning is deionized water at a temperature of 5°C; the dry-jet wet spinning has two washing and stretching, the first washing and stretching temperature is 80°C, the second washing and stretching The stretching temperature is 95°C; the distance from the spinning solution out of the spinneret to the coagulation bath in the air is 50mm; the spinning speed is 50m / min, and the dra...

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PUM

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Abstract

The invention relates to a preparation method of cellulose diacetate fiber, in particular to a preparation method of cellulose diacetate fiber for carrying out dry-jet wet spinning with ionic liquid serving as a solvent. The preparation method comprises the following steps of: 1, dissolving the cellulose diacetate in the ionic liquid to form a uniform and stable spinning stock solution, and 2, carrying out dry-jet wet spinning on the spinning stock solution to obtain the cellulose diacetate fiber. According to the preparation method of the cellulose diacetate fiber, provided by the invention, the problems of low tensile strength of fiber and poor mechanical performance existed in the cellulose diacetate dry spinning process, and low degree of substitution of the cellulose acetate fiber prepared by using the ionic liquid as the solvent, lower strength of the prepared fiber, and the like in the prior art are solved.

Description

Technical field [0001] The invention relates to a method for preparing cellulose diacetate fibers, in particular to a method for preparing cellulose diacetate fibers by dry-jet wet spinning with ionic liquid as a solvent. Background technique [0002] Cellulose diacetate (CDA) refers to cellulose triacetate (CTA) obtained after acetylation of cellulose, and then after partial saponification and hydrolysis, the product with a degree of substitution usually between 2 and 2.5. It is an earlier and more widely used cellulose derivative. [0003] Cellulose diacetate fiber is a fiber obtained by dissolving and spinning cellulose diacetate. It has the characteristics of moisture absorption and good adsorption. It is a kind of precision filter material, mainly used to make cigarette filters. The cellulose diacetate filament used in textiles is the closest to real silk among chemical fibers. It has elegant luster, bright dyeing, strong color fastness, soft hand feeling, light texture, low ...

Claims

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Application Information

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IPC IPC(8): D01F2/28D01D5/06
Inventor 王宝春杜骏蒋冠森陈珣王锐张玉梅王华平
Owner DONGHUA UNIV
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