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Prepn process of spinning dope for producing cellulose fibre through solvent process

A technology of cellulose fiber and preparation process, which is applied in the field of preparation process of spinning stock solution for producing cellulose fiber by solvent method, which can solve the problems of production efficiency decline and achieve the effects of improving uniformity, spinning quality and reducing cost

Inactive Publication Date: 2002-02-20
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the dissolution time of 6-12 hours not only reduces the production efficiency, but also easily causes the degradation of cellulose and solvents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The wood pulp that DP is 700 utilizes the common pulverizer of viscose production factory to pulverize, under decompression state (decompression to-7 * 10 4 Pa) and drying at 50°C for 6h, the water content of the obtained pulp (i.e. cellulose powder) is 2%;

[0021] The NMMO aqueous solution was evaporated under reduced pressure to make the water content equal to 13% (that is, the concentration of NMMO was 87%).

[0022] Place 7.2kg of the above pulp and 82.8kg of 87% NMMO aqueous solution in a mixer with a stirrer, stir and blend at 80°C for 10min, to prevent oxidation, add 90g of propyl gallate before mixing ;

[0023] The blended material is continuously fed into a twin-screw extruder with a screw length-diameter ratio of 1:48 for dissolution. The pressure intensity of the head (that is, the outlet) is controlled at 490N / cm 2 , After 5 minutes, a transparent and uniform spinning dope with a refractive index of 1.4840 can be obtained, and its spinnability is good.

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Abstract

The present invention relates to preparation of spinning liquid for producing cellulose fiber by solvent method, it is characterized in that: the powdered fiber paste from crusher is dried under -9X1,000 to -5X1,000 Pa and 30-50 deg.c for 6-12 hr. to make the water content is 2-4%; distill and concentrate N-methyl morpholine oxide (NMMO) aqueous solution under reduced pressure to water content lower than 15%; mix above mentioned powder and NMMO with certain proportion at 70-90 deg.C in mixer and stir for 10-30 min, to form light yellow coloured paste which is extruded by twin screw extruder with length-diameter ratio 1:42-1:52, after dissolve and defoam for 3-15 min., the obtained light brown transparent solution can be used for spinning. Advantages: energy saving, high efficiency etc.

Description

technical field [0001] The invention relates to a preparation process of a spinning stock solution for producing cellulose fiber by a solvent method in chemical fiber manufacturing industry. The fiber prepared from the spinning stock solution is widely used in industrial textiles and textiles for decorative clothing. Background technique [0002] Because cellulose fiber products have good hygroscopicity and moisture permeability, are comfortable to wear, and are rich in raw materials, product waste can be naturally degraded and decomposed into carbon dioxide and water by enzymes. Therefore, the production of this fiber material has attracted much attention in recent years. The traditional cellulose fiber is mainly produced by the viscose route, which uses carbon disulfide and a large amount of acid and alkali, which causes serious pollution to the environment, and the wet strength of the obtained viscose fiber is low. Fiber development. [0003] As early as the 1930s, it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F2/00
Inventor 邵惠丽胡学超章潭莉沈弋弋
Owner DONGHUA UNIV
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