Technological process for producing viscose fiber filament by secondary impregnation production

A secondary impregnation and viscose fiber technology, applied in the direction of artificial filaments made of viscose, can solve the problems of low amount of combined alkali, affecting yellowing effect, environmental pollution, etc., to improve the quality of alkali cellulose, improve Impregnation effect, effect of reducing environmental pollution

Inactive Publication Date: 2009-02-25
CHTC HELON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While ensuring the amount of combined alkali, the amount of free alkali also increases accordingly. A large amount of free alkali enters the yellowing process, and the probability of side reactions increases greatly, thereby affecting the yellowing effect, reducing production efficiency, and causing methylcellulose in viscose. The proportion of the alkali content (weight) is high, the consumption of chemical materials is high, the cost increases, and the alkali content in the discharged waste liquid is high, and the sulfides increase, causing environmental pollution
If a low-concentration immersion solution is used at the beginning, although the content of free alkali can be reduced, the hydrolysis reaction to form alkali cellulose is violent, resulting in a small amount of combined alkali, which cannot meet the yellowing requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: The process method of producing viscose filaments by secondary dipping, the raw material used is the special pulp for filaments; its degree of polymerization is 550~600, dynamic viscosity is 12.5±1.0mPa.s, a kind of cellulose Content ≥ 95%, ash ≤ 0.08%, iron content ≤ 18mg / kg, whiteness ≥ 80%, moisture 10±1.5%.

[0020] The process steps adopted are as follows:

[0021] a. One impregnation, one pressing and crushing

[0022] Put the pulp into the dipping barrel once for dipping. The concentration of the alkali solution in the dipping barrel is 240g / L, and the dipping temperature is 51.5°C. 27.5%, alkali fiber contains 17.8% alkali. The macerate is then taken out for a press and pre-crushed to produce a coarse material;

[0023] b. Second impregnation, second pressing and fine crushing

[0024] Put the crude material into the secondary impregnation tank for secondary impregnation. The concentration of alkali solution in the impregnation tank is 172g / L, ...

Embodiment 2

[0046] Embodiment 2: basically the same as Embodiment 1, the difference is that

[0047] In one impregnation step, the concentration of lye in the impregnation tank is 230g / L, and the impregnation temperature is 54.5°C;

[0048] In the second impregnation step, the concentration of the impregnation lye is 180g / L, the impregnation temperature is 53.5°C, and the auxiliary agent Afilan ZS is added to the impregnation solution, and the dosage is 0.08% of the methylcellulose content in the pulp raw material;

[0049] In the aging step, aging at 45°C for 7 hours, followed by cooling at 22°C for 11.5 hours;

[0050] Yellowing step, CS 2 The amount of addition is equivalent to 28.5% of the methyl cellulose content in alkali cellulose;

[0051] In the aging step, the aging time is 36 hours; the index of the spinning glue is 8.1%, alkali fiber: 5.6%, viscosity: 32s, and maturity: 9.8ml.

[0052] In the spinning step, coagulation bath: sulfuric acid 125g / l, zinc sulfate 11.8g / L, sodiu...

Embodiment 3

[0064] Embodiment 3: basically the same as Embodiment 1, the difference is that

[0065] In the second impregnation step, the concentration of the impregnation alkali solution is 160g / L, and the auxiliary agent V32 is added to the impregnation solution, and the dosage is 0.1% of the methylcellulose content in the pulp raw material;

[0066] In the aging step, aging at 38°C for 9 hours, followed by cooling at 24°C for 10 hours;

[0067] Yellowing step, CS 2 The amount of addition is equivalent to 31.0% of the methyl cellulose content in alkali cellulose;

[0068] In the aging step, the aging time is 39 hours; the index of spinning glue is 8.3% of methyl fiber, 5.8% of alkali, viscosity of 38s, and maturity of 10.1ml.

[0069] In the spinning step, coagulation bath: sulfuric acid 130g / l, sodium sulfate 300g / l, zinc sulfate 12g / L, temperature 50.5°C, transparency 1000mm; spinning process: nozzle drafting 4.2%, disc drafting 20%.

[0070] The viscose filament fiber index that i...

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Abstract

The invention discloses a technique method for producing viscose fiber filaments by adopting secondary dipping. In the method, the secondary dipping technology is adopted based on the technique of primary dipping for producing viscose fiber filaments; besides, the concentration difference of free bases in secondary alkali liquid and soda cellulose are utilized to separate out partial free bases; simultaneously the semi-fiber content of the soda cellulose is reduced; under the situation of not affecting the amount of the combined soda, the secondary reactions during an etiolation process are reduced; the adding amount of carbon bisulfide is reduced; the viscose quality is ensured; and the dipping effect is improved by adding a novel addition agent in the secondary dipping process; proper aging, etiolation, ripening and spinning techniques are selected to produce the viscose filaments with high quality; besides, the production cost is reduced; the production efficiency is improved and the environment pollution is reduced.

Description

technical field [0001] The invention relates to a process method for producing viscose fiber filaments, in particular to a process method for producing viscose fiber filaments by adopting a "second dipping method". Background technique [0002] The preparation of alkali cellulose is the first process of viscose fiber production. The quality of alkali cellulose produced by it is directly related to the quality of viscose preparation, which in turn affects the quality of the final product of fine glue fiber, especially viscose Filament production has higher requirements on the quality of alkali cellulose production. When my country developed viscose fiber in the 1950s, five-in-one machine viscose was used for short fiber growth, which combined the preparation of alkali cellulose and viscose. The five-in-one machine was not used for filament production, but the traditional intermittent box-type machine was used. The process of dipping and aging at high temperature, that is, aft...

Claims

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Application Information

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IPC IPC(8): D01F2/06
Inventor 田素峰刘建华卢海蛟姜明亮马峰刚李琳王东
Owner CHTC HELON
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