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Preparation technique of cellulose fibre spinning solution

A technology of cellulose fiber and spinning stock solution, which is applied to the preparation of spinning solution and artificial filament in cellulose solution, etc., which can solve the problems of severe swelling of cellulose, expensive raw materials, and difficulty in recycling, etc., and achieve reduction The requirements of equipment, the effect of improving solubility and simple production process

Inactive Publication Date: 2009-05-20
CHTC HELON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the amine oxide system (NMMO) and ionic liquid system solvents that have made substantial progress are also unable to quickly undertake the important task of revolutionizing the viscose industry in the short term due to expensive raw materials, difficult recycling, patent ownership and other bottleneck issues.
[0003] The urea / alkaline water system is a newly developed new type of solvent for cellulose. The solvent of this system has the characteristics of cheap and easy-to-obtain raw materials, simple process, and easy recovery of chemical raw materials. However, the urea / alkaline water system currently used by people dissolves The method of cellulose, or the solubility of cellulose is low, only about 5%, or the cellulose is mixed with aqueous sodium hydroxide solution and then pre-cooled to form alkali cellulose, and then mixed with urea. Alkalinization, the swelling of cellulose in the lye is very violent, and further dissolution will have high requirements on the equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Put the cotton pulp with a degree of polymerization of 450 into the alkali solution with an alkali concentration of 150g / L to soak and alkalize for 30 minutes. After the alkalization temperature is 52°C, press and crush, the cellulose mass content in the prepared alkali cellulose is 15% alkali mass content is 8%, and after cooling to room temperature, it is then transported to the reactor, and urea aqueous solution is added to the reactor. The urea mass content in the urea aqueous solution is 10%, and the amount of urea added is the relative methylcellulose amount After cooling to -3°C, stir until it is completely dissolved, and vacuum defoaming is carried out while dissolving to obtain a uniform and transparent spinning stock solution.

Embodiment 2

[0016] Put the cotton pulp with a degree of polymerization of 350 into the alkali solution with an alkali concentration of 90g / L to basify and alkalize for 40 minutes. After the alkalization temperature is 45°C, after pressing and crushing, the obtained alkali cellulose has a mass content of 18%, the mass content of alkali is 8%, and after cooling to room temperature, it is transported to the reactor, and urea aqueous solution is added to the reactor. The mass content of urea in the urea aqueous solution is 15%, and the amount of urea added is 20% %, after cooling to 4°C, stir until it is completely dissolved, and vacuum defoaming is carried out while dissolving to obtain a uniform and transparent spinning dope.

Embodiment 3

[0018] Put the cotton pulp with a degree of polymerization of 390 into the alkali solution with an alkali concentration of 180g / L to soak and alkalize for 20 minutes. After the alkalization temperature is 50°C, after pressing and crushing, the obtained alkali cellulose has a mass content of 30%, the mass content of alkali is 8%, and after cooling to room temperature, it is transported to the reactor where the urea aqueous solution is added in advance for mixing. After cooling to -3°C, stir until it is completely dissolved, and vacuum defoaming is carried out while dissolving to obtain a uniform and transparent spinning stock solution.

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Abstract

The invention discloses a preparation technology of cellulose fiber spinning solution. Cellulose pulp is adopted, subjected to alkalization, squeezing, crushing, and cooling to room temperature, mixed with urea aqueous solution, cooled to minus 5 DEG C to 15 DEG C, and stirred till alkali cellulose completely dissolves, and vacuum defoamation is carried out simultaneously in dissolution to prepare the uniform and transparent spinning solution. The solution has good spinning performance.

Description

technical field [0001] The invention relates to a process for preparing spinning dope of solvent-spun fibers. Background technique [0002] For a long time, the contradiction between the market demand of regenerated cellulose fiber and the relatively backward production technology has become the bottleneck of further expansion of regenerated cellulose fiber. With the improvement of environmental protection awareness all over the world, this contradiction has become increasingly prominent. Seeking new solvents for green processing of regenerated cellulose fibers provides a new way to solve this contradiction. However, the clean production of domestic viscose fiber production, especially the progress in industrialization, is far from meeting the needs of enterprise development. At present, the amine oxide system (NMMO) and ionic liquid system solvents that have made substantial progress are also unable to quickly undertake the revolution in the viscose industry in the short t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01D1/02D01F2/02
Inventor 田素峰刘建华王乐军李琳马峰刚
Owner CHTC HELON