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Spinning cellulose diacetate fiber preparation method

A technology of cellulose diacetate and fiber is applied in the field of preparation of cellulose diacetate fiber for textiles, which can solve the problems of zero research on short filament of diacetate fiber, increased environmental protection cost, harm to the environment, etc. Low environmental impact and low mitigation intensity

Active Publication Date: 2020-01-14
HUBEI XINYANG SPECIAL FIBER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The long / short triacetate fiber uses di / chloroform as a solvent, which seriously endangers the environment, and the cost of environmental protection is increasing day by day.
Moreover, my country has conducted in-depth research on tobacco tow. There are professional research institutes and more than 10 manufacturers, but the research on short diacetate fibers for textiles is almost zero. At present, there is no enterprise commercially producing acetate fibers. Short filament

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of cellulose diacetate fiber for weaving comprises the following steps:

[0030] 1) Prepare the spinning slurry according to the solid-liquid ratio of 30:70; the solid phase is cellulose diacetate and wood pulp fiber, and the mass ratio of the two is 99.92:0.08; the liquid phase is a mixed solution of acetone, water and internal lubricant, The mass ratio of acetone, water, and internal lubricant in the liquid phase is 94.7:5:0.3; the solid-liquid two-phase is mixed evenly by high-shear stirring for 8 hours, and the viscosity of the slurry is about 180 Pa·s at 50 °C. Wherein the number-average molecular weight of cellulose diacetate is 45000, and the acetyl value is 53.5; the average length of wood pulp fiber is 3800 microns, and the internal lubricant is 10# white oil.

[0031] 2) The spinning slurry is filtered by a filter press for secondary filtration, in which the primary filter is 85kg of pre-coated wood pulp, the pre-coating concentration is...

Embodiment 2

[0035] The preparation method of cellulose diacetate fiber for weaving comprises the following steps:

[0036] 1) Prepare the spinning slurry according to the solid-liquid ratio of 29:71; the solid phase is cellulose diacetate and wood pulp fiber, and the mass ratio of the two is 99.94:0.06; the liquid phase is a mixed solution of acetone, water and internal lubricant, The mass ratio of acetone, water and internal lubricant in the liquid phase is 94.7:4.5:0.2; the solid and liquid phases are mixed evenly by high-shear stirring for 8 hours, and the viscosity of the slurry is about 175 Pa·s at 50 °C. Wherein the number-average molecular weight of cellulose diacetate is 43,000, and the acetyl value is 53.4; the average length of wood pulp fibers is 3,200 microns, and the internal lubricant is 26# white oil.

[0037] 2) The spinning slurry is filtered by a filter press for secondary filtration, wherein the primary filter is pre-coated wood pulp 100kg, pre-coated concentration 1.5%...

Embodiment 3

[0041] The preparation method of cellulose diacetate fiber for weaving comprises the following steps:

[0042] 1) Prepare the spinning slurry according to the solid-liquid ratio of 30:70; the solid phase is cellulose diacetate and wood pulp fiber, and the mass ratio of the two is 99.96:0.04; the liquid phase is a mixed solution of acetone, water and internal lubricant, The mass ratio of acetone, water, and internal lubricant in the liquid phase is 94.7:5:0.3; the solid-liquid two-phase is mixed evenly by high-shear stirring for 6 hours, and the viscosity of the slurry is about 165 Pa·s at 50 °C. Wherein the number-average molecular weight of cellulose diacetate is 42,000, and the acetyl value is 53.5; the average length of wood pulp fibers is 2,900 microns, and the internal lubricant is 10# white oil.

[0043] 2) The spinning slurry is filtered by a filter press for secondary filtration, in which the primary filter is pre-coated wood pulp 100kg, pre-coated concentration 1%, pr...

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Abstract

The invention discloses a spinning cellulose diacetate fiber preparation method which includes the steps: 1) preparing spinning pulp by a solid phase and a liquid phase, and uniformly stirring and mixing the solid phase and the liquid phase to obtain the spinning pulp; 2) primarily filtering the spinning pulp by a pressure filter and secondarily filtering obtained filtrate; 3) pressurizing and heating the filtrate obtained in the step 2) to reach 1.0Mpa and 59 DEG C or more, performing dry spinning on the filtrate after passing a candle filter and a precision metering pump, and applying a flash spinning technology in the spinning process with the draft ratio of 1.5-2.0; 4) crimping fibers formed after spinning to obtain cellulose diacetate fibers. The solid phase comprises cellulose diacetate and wood pulp fibers, the liquid phase is mixed solution of acetone, water and internal lubricants, and differential pressure is as low as 0.1-0.3MPa. By the aid of the method, the spinning cellulose diacetate fibers can be industrialized, and high-strength low-denier short fibers are produced.

Description

technical field [0001] The invention belongs to the field of diacetate fiber spinning, in particular to a preparation method of cellulose diacetate fiber for textile. Background technique [0002] At present, diacetate cellulose tow for cigarettes is in a saturated state in the world. As the number of smokers decreases and the output of cigarettes decreases, the tobacco tow industry needs transformation and upgrading to improve the competitiveness of enterprises. With viscose fiber production causing serious environmental pollution, the demand for triacetate / diacetate fiber textile raw materials is increasing day by day. The long / short triacetate fiber uses di / chloroform as a solvent, which seriously endangers the environment, and the cost of environmental protection is increasing day by day. The performance of diacetate fiber textile materials is similar to that of triacetate fiber, but in terms of demand, it is mainly short yarn, which is blended with polyester and spand...

Claims

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Application Information

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IPC IPC(8): D01D1/02D01D1/10D01D5/04D01D5/084D01D5/096D01F2/30D01F1/10
CPCD01D1/02D01D1/106D01D5/04D01D5/084D01D5/096D01F1/10D01F2/30
Inventor 叶小波叶兆清冯明华黄爱成周全林冯艳洲
Owner HUBEI XINYANG SPECIAL FIBER CO LTD
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