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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

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

[0020] The process steps used are as follows:

[0021] a, one dipping, one pressing and crushing

[0022] Put the pulp into the primary dipping bucket for dipping. The concentration of the lye in the dipping bucket is 240g / L, the dipping temperature is 51.5℃, after one dipping, the semi-fiber content is 19.0g / L, and the content of methyl fiber in the alkali cellulose is 27.5%, alkali fiber contains 17.8% alkali. Then take out the impregnated material, squeeze and pre-pulverize it once to make a coarse material;

[0023] b. Secondary dipping, secondary pressing and fine crushing

[0024] Put the crude material into the second impregnation ...

Example Embodiment

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

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

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

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

[0050] During the yellowing step, CS 2 The added amount is equivalent to 28.5% of the methylcellulose content in alkali cellulose;

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

[0052] In the spinning step, coagulation bath: sulfuric acid 12...

Example Embodiment

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

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

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

[0067] During the yellowing step, CS 2 The added amount is equivalent to 31.0% of the methylcellulose content in alkali cellulose;

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

[0069] In the spinning step, the 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%, inter-disk drafting 20%.

[0070] The ind...

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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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