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Preparation method of SMA and PVDF blended hollow fiber membrane

A fiber membrane and hollow technology, applied in the field of membrane science, can solve the problems of reducing the service life of the membrane, shortening the use time, narrowing the use range, etc., and achieve the effects of prolonging the service life, improving anti-pollution performance, and excellent processing performance

Pending Publication Date: 2021-04-30
浙江易膜新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since PVDF is a hydrophobic linear crystalline polymer, the surface of the prepared PVDF hollow fiber membrane will show strong hydrophobicity. In the actual use process, the membrane will be polluted due to the effect of adsorption, resulting in membrane The scope of use is reduced, the use time of the membrane is shortened, and the service life of the membrane is reduced

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 15 parts of PVDF, 15 parts of SMA, 48 parts of solvent (28 parts of N-N dimethylacetamide, 20 parts of N-methylpyrrolidone), porogen (3 parts of glycerin, 4 parts of ethylene glycol, 3 parts of water, 3 parts of ethanol , 3 parts of n-butanol, 3 parts of isopropanol, and 3 parts of cationic surfactant), heated and stirred at 65 ° C to form a mixed solution, and the solution was spun by wet spinning after vacuum defoaming. The temperature of the liquid is 40°C; the spinning liquid is extruded from the spinneret hole, and passes through a coagulation bath mixed with N-N dimethylformamide and water. The concentration of the solvent in the coagulation bath is 20wt%, and the temperature of the coagulation bath is 30°C. The spinning distance into the water is 5 cm; the spinning speed is 20 m / min. After collecting with a wire winding roller, continue to remove the solvent and porogen in a water tank, remove and dry after 3 days, and finally obtain a hollow fiber membrane. The...

Embodiment 2

[0024] 18 parts of PVDF, 18 parts of SMA, 48 parts of solvent (N-N dimethylacetamide), porogen (5 parts of polyethylene glycol PEG, 6 parts of polyvinylpyrrolidone PVP, 3 parts of deionized water, 2 parts of glycerin) Mixture), heated and stirred at 70°C to form a mixed solution, the solution was spun by wet spinning after vacuum defoaming, the temperature of the spinning solution was 60°C; a mixed porogen was used to make the hollow The fiber membrane has a smooth and dense surface, and a finger-shaped hole or a sponge-like structure with a relatively large pore size distribution can be formed inside the membrane. The spinning solution is extruded from the spinneret hole, and passes through a coagulation bath mixed with DMAC and water. The concentration of the solvent in the coagulation bath is 60wt%, the temperature of the coagulation bath is 70°C, and the distance of spinning into the water is 20cm; the spinning speed is 50 m / min. After collecting with a wire winding rolle...

Embodiment 3

[0026] 20 parts of PVDF, 19 parts of SMA, solvent (20 parts of N-N dimethylacetamide, 23 parts of dimethyl sulfoxide), porogen (6 parts of polyethylene glycol PEG, 7 parts of polyvinylpyrrolidone PVP, 3 parts Deionized water, 2 parts of glycerin mixture), heated and stirred at 70°C to form a mixed solution, the solution was vacuum degassed and then spun by wet spinning technology, the temperature of the spinning solution was 55°C; the spinning solution Extruded from the spinneret hole, passed through the coagulation bath formed by mixing N-N dimethylformamide: dimethyl sulfoxide and water with a weight ratio of 1:2, the solvent concentration of the coagulation bath is 55wt%, and the temperature of the coagulation bath is 80 ℃, the spinning distance into the water is 30cm; the spinning speed is 70 m / min. After collecting with a wire winding roller, continue to remove the solvent and porogen in a water tank, remove and dry after 3 days, and finally obtain a hollow fiber membrane...

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Abstract

The invention discloses a preparation method of an SMA and PVDF blended hollow fiber membrane, which belongs to the technical field of membrane science. The preparation method comprises the following steps of 1) heating, stirring and dissolving PVDF, SMA, a solvent and a pore-foaming agent to form a mixed solution, and performing vacuum defoaming on the solution to obtain a spinning solution, and 2) obtaining a hollow fiber membrane by adopting wet spinning, enabling the primary hollow fiber membrane filaments to sequentially pass through an air layer, a coagulating bath and filament winding collection, then entering a water tank for further exchange, fishing out the membrane filaments after the exchange is finished, and naturally airing in a shady, cool and ventilated place to finally obtain the hollow fiber membrane. According to the preparation method of the SMA and PVDF blended hollow fiber membrane, the preparation method is simple, the hydrophilicity of the PVDF hollow fiber membrane is gradually increased along with the increase of the addition amount of SMA, and the anti-pollution performance of the PVDF hollow fiber membrane is gradually enhanced.

Description

[0001] The invention belongs to the field of membrane science and technology, in particular to a method for preparing a hollow fiber membrane blended with SMA and PVDF. Background technique [0002] Membrane separation technology is a high-tech with great development prospects in recent years. Compared with traditional separation processes such as filtration, screening, rectification, extraction, evaporation, recrystallization, sublimation, decolorization, leaching, adsorption, and ion exchange, membrane separation technology has It has unique characteristics such as strong adaptability, good selectivity, simple preparation process, energy saving, no phase change, and no secondary pollution. [0003] There are many kinds of polymer membrane materials, such as polypropylene, polysulfone, polyethersulfone, cellulose acetate and so on. Polyvinylidene fluoride (PVDF) has excellent physical and chemical properties, has excellent processing properties, thermal stability and chemical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D67/00
CPCB01D69/08B01D69/087B01D2325/36B01D2325/30B01D2323/12
Inventor 陈俊超叶麒周燕邱晖王炎峰
Owner 浙江易膜新材料科技有限公司
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