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Cellulose solution coagulation forming method

A cellulose solution, coagulation forming technology, applied to the chemical post-treatment of artificial filaments in cellulose solution, cellulose/protein artificial filaments, etc., can solve the problems of difficult handling of sodium sulfate, high product cost, and uneven fiber structure To achieve the effect of increasing the complexity of the production process, improving the dry strength and wet strength, and increasing the drafting ratio

Active Publication Date: 2012-05-09
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned cellulose solutions are all formed by chemical reaction, and the forming speed is fast, but the raw materials sulfuric acid and sodium hydroxide are consumed, and a cheap and difficult to handle by-product sodium sulfate is produced.
The urea solvent method cellulose solution contains a large amount of sodium hydroxide. If the method of physical forming is not adopted, the above method will inevitably cause a large amount of consumption of raw materials such as urea, sodium hydroxide, and sulfuric acid, and produce a large amount of sodium sulfate by-products. It also makes the recovery of urea very difficult, resulting in high product cost of this production process, and in addition, it has a certain impact on the environment
In terms of quality, the fiber formed by sulfuric acid reaction has been tested to have a certain degree of brittleness and low strength, which may be due to the violent exothermic reaction between a large amount of acid and the alkali of the cellulose solution, which causes the structure of the fiber inside and outside to be uneven. , so that the cellulose solution with a high degree of polymerization (DP=500-600) can obtain fibers with very low strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Cellulose pulp is dissolved in the mixed aqueous solution that urea, sodium hydroxide and water form, obtain cellulose solution, the mass percent concentration of pulp is 4.96%, the mass percent concentration of urea is 11.45%, the mass percent concentration of sodium hydroxide The concentration is 6.61%; the obtained cellulose solution is solidified in the first coagulation bath, the first coagulation bath is pure hot water at a temperature of 95° C., and the other components are zero. The first coagulation bath coagulates the cellulose solution and discharges it directly after use, without recycling; the solid fiber after the first solidification in the coagulation bath at the spinneret of the spinning machine enters the godet roller for drafting and then passes through the second coagulation bath solidify in medium, and obtain cellulose fiber through subsequent treatment, wherein, the composition of the second coagulation bath is sulfuric acid with a concentration of ...

Embodiment 2

[0049] Cellulose pulp is dissolved in the mixed aqueous solution that urea, sodium hydroxide and water form, obtain cellulose solution, the mass percent concentration of pulp is 4.87%, the mass percent concentration of urea is 11.69%, the mass percent concentration of sodium hydroxide Concentration is 6.90%; The cellulose solution that obtains is solidified in the first coagulation bath, and the temperature of the first coagulation bath is 90 ℃, and the length of the first coagulation bath barrel (bath depth) is 900mm, and the coagulation bath flow rate is cellulose solution 35 times of the volume flow rate, the mass percentage concentration of urea is 0.3%, and the mass percentage concentration of sodium hydroxide is 0.1%; the solid fiber after the first solidification in the coagulation bath at the spinneret of the spinning machine enters the godet roll After stretching, solidify in the second coagulation bath, and then obtain cellulose fibers through subsequent treatment, wh...

Embodiment 3

[0051] Cellulose pulp is dissolved in the mixed aqueous solution that urea, sodium hydroxide and water form, obtain cellulose solution, the mass percent concentration of pulp is 5.03%, the mass percent concentration of urea is 11.90%, the mass percent concentration of sodium hydroxide Concentration is 7.10%; The cellulose solution that obtains is solidified in the first coagulation bath, and the temperature of the first coagulation bath is 65 ℃, and the length of the first coagulation bath barrel (bath depth) is 700mm, and the coagulation bath flow rate is cellulose solution 40 times of the volume flow rate, the mass percentage concentration of urea in the coagulation bath composition is 0.2%, and the mass percentage concentration of sodium hydroxide is 0.1%; The silk roll is drawn and then solidified in the second coagulation bath, and then the cellulose fiber is obtained through subsequent treatment, wherein, the composition of the second coagulation bath is sulfuric acid wit...

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Abstract

The invention discloses a cellulose solution coagulation forming method, which comprises the following steps of: (1) dissolving cellulose pulp into a mixed aqueous solution consisting of urea or thiourea, alkali metal hydroxide and water to obtain a cellulose solution; (2) curing the cellulose solution in the (1) in a non-acid first coagulation bath at the temperature of between 50 and 100 DEG C, wherein the concentrations of the urea / thiourea and the alkali metal hydroxide are lower than those of the corresponding components in the (1); and (3) obtaining cellulose fibers by subsequent treatment. The product has drawing plasticity, and can create an advantage for improving the strength. The production process and the production equipment of the forming method are simple, the equipment and the plant are not corroded in the production process, and the production costs of urea solvent cellulose fibers, glass paper, films, sponge and related products generated by the cellulose solution are greatly reduced; and the method has high economic benefit and social environment-friendly benefit.

Description

technical field [0001] The invention relates to a method for coagulating and forming a cellulose solution, in particular to a method for forming a cellulose solution by a urea solvent method. Background technique [0002] Cellulose is the most abundant renewable polymer in nature. It has good biocompatibility, biodegradability and many other excellent properties. It can be used to prepare a variety of functional cellulose products. Among them, alkaline solution is currently the most Promising cellulose solvent systems such as sodium hydroxide / urea etc., after which the cellulose solution is shaped in an acidic coagulation bath. For example, Chinese Patent Application No. 200710021068.8 discloses an industrial method for preparing regenerated cellulose filaments. The cellulose is dissolved in a solvent, stirred sufficiently to obtain a cellulose solution, and the cellulose solution is filtered, defoamed, spinned, and coagulated in a coagulation bath. , washing, drawing, and ...

Claims

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Application Information

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IPC IPC(8): D01F2/02D01F11/02
Inventor 谢和平
Owner CHINESE TEXTILE ACAD
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