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Deaeration method of cellulose ionic liquid solution for solvent spinning

A technology of ionic liquid and cellulose, which is applied in fiber treatment, filament forming treatment, textile and paper making, etc., can solve the problems of degassing efficiency, energy saving effect and operability inferior to degassing method, and reduce the difficulty of degassing Effect

Active Publication Date: 2013-10-30
潍坊欣龙生物材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The patent number is CN200810082442.X, and the Chinese patent titled "A High Viscosity Fluid Degassing Method and Its Device" discloses an improved technology based on the slit overflow vacuum degassing method. Fluids with medium viscosity have a certain degassing effect, but they are powerless for fluids with higher viscosity
[0005] The patent number is CN200910256549.6 and the Chinese patent titled "Degassing method of high-temperature high-viscosity cellulose / ionic liquid solution" discloses a cavitation effect mechanism using a twin-screw extruder plus an ultrasonic generator to complete the cellulose ionization process. The defoaming of liquid solution; the patent No. is the Chinese patent of CN201010101934.6 a kind of defoaming method of cellulose ionic liquid solution then discloses the defoaming of cellulose ionic liquid solution with thin film evaporator in conjunction with rising temperature defoaming process; Both of the two defoaming technical solutions achieve the defoaming of high-temperature and high-viscosity cellulose / ionic liquid solutions, but they are inferior to the defoaming method introduced in this patent in terms of defoaming efficiency, energy saving effect and operability

Method used

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  • Deaeration method of cellulose ionic liquid solution for solvent spinning

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Degassing of 10% mass concentration cellulose / 1-allyl-3-methylimidazolium chloride ionic liquid solution

[0028] Put the dry pulp fines into the dissolution tank, stir and vacuumize for 20 minutes, and then inhale the degassed ionic liquid 1-allyl-3-methylimidazolium chloride through the vacuum negative pressure in the dissolution tank. compound, while inhaling and stirring to vacuumize. After the addition, stir and vacuum for 90 minutes, the vacuum degree is -0.099~-0.090MPa, and the temperature of the spinning solution in the dissolution tank is 95°C. After vacuum dissolution, the viscosity of the material is 3200Pa.S. When the temperature of the material is raised from 95°C to 140°C, the viscosity of the spinning solution drops to 900Pa.S. In this way, as the viscosity of the spinning solution is greatly reduced, the fluidity becomes better, which is beneficial to the effective removal of air bubbles in the material. The material is uniformly fed into a horizonta...

Embodiment 2

[0030] Degassing of cellulose / 1-butyl-3-methylimidazolium chloride solution with 8% mass concentration

[0031] Put the dry pulp fines into the dissolving tank, stir and vacuumize for 10 minutes, then inhale the 1-butyl-3-methylimidazolium chloride liquid after vacuum distillation and degassing through the vacuum negative pressure in the dissolving tank, Stir and vacuum while inhaling. After the addition, stir and vacuum for 30 minutes, the vacuum degree is -0.099~-0.090MPa, and the temperature of the spinning solution in the dissolution tank is 60°C. After vacuum dissolution, the viscosity of the material is 2000Pa.S. When the temperature of the material is raised from 60°C to 110°C, the viscosity of the spinning solution drops to 600Pa.S. In this way, as the viscosity of the spinning solution is greatly reduced, the fluidity becomes better, which is beneficial to the effective removal of air bubbles in the material. The material is evenly fed into the horizontal continuou...

Embodiment 3

[0033] Degassing of cellulose / 3-methyl-N-butylchloropyridine solution with 12% mass concentration

[0034] Put the dry pulp fines into the dissolving tank, stir and vacuumize for 20 minutes, then inhale the degassed ionic liquid 3-methyl-N-butylchloropyridine through vacuum negative pressure. Stir and vacuum. After the addition, stir and vacuum for 150 minutes, the vacuum degree is controlled in the range of -0.099~-0.090MPa, and the solution temperature in the tank is 80°C. After vacuum dissolution, the viscosity of the material is 3200Pa.S. Raise the temperature of the material from 80°C to 120°C, at this time the viscosity of the spinning solution will drop to 1000Pa.S. The material is evenly fed into a horizontal continuous stripping kettle with a length-to-diameter ratio of 5:1, a vacuum degree stabilized at -0.099 to -0.095MPa, and a temperature of 120°C through a metering pump. The feed rate is 265ml / min. The material is continuously forced to form a film with a thic...

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Abstract

The invention discloses a deaeration method of a cellulose ionic liquid solution for solvent spinning. In the method, a combined mode of performing vacuum dissolution of pulp, reducing viscosity by raising temperature, and performing kettle-stripping and deaeration is adopted to realize the deaeration of the cellulose ionic liquid solution. The method has the advantages that: by adopting the combined characteristics of multi-sectional combined deaeration, equipment deaeration and process adjustment, difficulty in deaeration of a high-viscosity spinning solution is reduced to the greatest extent, and thorough deaeration is realized.

Description

technical field [0001] The invention relates to a defoaming method, in particular to a defoaming method for a cellulose ionic liquid solution used in solvent spinning, and belongs to the field of regenerated cellulose fiber production. Background technique [0002] In the technological process of regenerated cellulose fiber production, a certain amount of air or bubbles generated by light components will inevitably be generated or wrapped in the spinning solution. The content of bubble-like air dispersed in every liter of viscose spinning solution prepared by conventional method is 30-40ml. The existence of these bubbles will destroy the capillary structure of the filter material when filtering, causing the gel particles to leak. During spinning and forming, air bubbles will also cause fiber breakage and defects, and tiny air bubbles will easily form air bubble filaments, thereby reducing the strength index of the fiber. [0003] The spinning solution in the conventional vi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01D1/10
Inventor 逄奉建曹其贵刘建华马峰刚姜明亮王东卢海蛟秦翠梅
Owner 潍坊欣龙生物材料有限公司
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