Polyvinylidene-fluoride hollow fibre membrane and preparation method thereof

A polyvinylidene fluoride, fiber membrane technology, which is applied in hollow filament manufacturing, fiber processing, fiber chemical characteristics, etc., can solve the problems of low pure water flux, unsatisfactory, and poor anti-pollution performance of hollow fiber membrane products. Achieve the effect of being beneficial to water flux, preventing membrane pores from becoming smaller, and enhancing anti-fouling performance

Inactive Publication Date: 2012-12-26
CHINA HUADIAN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the patent application with the application number 200910231291.4 titled "Polyvinylidene Fluoride Hollow Fiber Ultrafiltration Membrane with Permanent Hydrophilicity and Preparation Method", the PVDF raw material is grafted with polar monomers to achieve the hydrophilicity of the membrane filaments. modified, but the final hollow fiber membrane product has low pure water flux and poor anti-pollution performance, which cannot meet the needs of practical applications
In the patent application with the application number 201110186228.0 titled "Polyvinylidene Fluoride Hollow Fiber Membrane and Its Preparation Method", calcium carbonate and silicon dioxide are used as reinforcing agents after modification treatment, so as to realize the mechanical strength and pore size of the membrane filament Uniformity control, but the hydrophilic modification of the obtained hollow fiber membrane products is non-permanent modification without radiation or grafted hydrophilic groups

Method used

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  • Polyvinylidene-fluoride hollow fibre membrane and preparation method thereof
  • Polyvinylidene-fluoride hollow fibre membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 25 parts of polyvinylidene fluoride 60 parts of dimethylformamide 1 part of sodium lauryl sulfate

[0029] 8 parts of polyethylene glycol, 1 part of lithium nitrate, 5 parts of cellulose acetate

[0030] Add the above-mentioned polyvinylidene fluoride, dimethylformamide, sodium lauryl sulfate, polyethylene glycol, lithium nitrate, and cellulose acetate into the stirring tank, stir, heat and blend at 80°C, and the stirring speed is 100r / min, and the stirring time is 3 hours; the blend solution is left to stand for 4 hours for defoaming treatment, and the temperature is lowered to 60°C to obtain the casting solution; the casting solution and the aqueous solution are extruded through the spinning nozzle under the pressure of nitrogen, and passed through a 100mm air After a distance, immerse in a 35°C aqueous solution coagulation bath at a uniform speed; stretch at a speed of 60m / min in an external coagulation bath to obtain a formed polyvinylidene fluoride hollow fiber me...

Embodiment 2

[0032] 17 parts of polyvinylidene fluoride 50 parts of dimethylformamide 3 parts of sodium lauryl sulfate

[0033] 12 parts of polyethylene glycol, 8 parts of lithium nitrate, 10 parts of cellulose acetate

[0034]Add the above-mentioned polyvinylidene fluoride, dimethylformamide, sodium lauryl sulfate, polyethylene glycol, lithium nitrate, and cellulose acetate into the stirring tank, stir, heat and blend at 100°C, and the stirring speed is 120r / min, and the stirring time is 6 hours; the blend solution is left to stand for 6 hours for defoaming treatment, and the temperature is lowered to 80°C to obtain the casting solution; the casting solution and the aqueous solution are extruded through the spinning nozzle under the pressure of nitrogen, and passed through a 200mm air After a distance, immerse in a 60°C dimethylacetamide aqueous solution coagulation bath at a constant speed; stretch at a speed of 100m / min in the external coagulation bath to obtain a formed polyvinylidene...

Embodiment 3

[0036] 15 parts of polyvinylidene fluoride 80 parts of dimethylformamide 1 part of sodium lauryl sulfate

[0037] Polyethylene glycol 2 parts Lithium nitrate 2 parts Cellulose acetate 1 part

[0038] Add the above-mentioned polyvinylidene fluoride, dimethylformamide, sodium lauryl sulfate, polyethylene glycol, lithium nitrate, and cellulose acetate into the stirring tank, stir, heat and blend at 70°C, and the stirring speed is 90r / min, the stirring time is 1h; the blend solution is left to stand for 1h for defoaming treatment, and the temperature is lowered to 40°C to obtain the casting solution; the casting solution is extruded through the spinning nozzle with the dimethylacetamide aqueous solution under the pressure of nitrogen , immersed in a 30°C aqueous solution coagulation bath at a uniform speed; stretched at a speed of 10m / min in the external coagulation bath to obtain a formed polyvinylidene fluoride hollow fiber membrane; the formed polyvinylidene fluoride hollow fi...

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Abstract

The invention discloses a polyvinylidene-fluoride hollow fibre membrane and a preparation method thereof. Calculated according to parts by weight, the polyvinylidene-fluoride hollow fibre membrane is mainly prepared by the following components: 15 to 25 parts of polyvinylidene fluoride, 50 to 80 parts of solvent, 1 to 3 parts of surfactant, 2 to 12 parts of polymeric additive, 1 to 8 parts of inorganic additive and 1 to 12 parts of modified blend. By utilizing the simultaneous action of two modes of organic blending and inorganic adding according to the polyvinylidene-fluoride hollow fibre membrane and the preparation method thereof, the hydrophilcity of the polyvinylidene-fluoride hollow fibre membrane is obviously improved, and the pollution resistance can be obviously reinforced; and the pure water flux of the polyvinylidene-fluoride hollow fibre membrane is further enhanced by selecting and regulating the raw materials and the mixture ratio of the modified blend and the inorganic additive so as to obtain the permanently hydrophilic modified polyvinylidene-fluoride hollow fibre membrane.

Description

technical field [0001] The invention relates to a polyvinylidene fluoride hollow fiber membrane and a preparation method thereof, belonging to the technical field of water treatment. Background technique [0002] Membrane separation technology has the advantages of high efficiency, low energy consumption, simple process, compact equipment, safe filtration, and no pollution. It is widely used in industries such as electronic chemical industry, biomedicine, food and beverage, and environmental protection. in the water treatment industry. Because of its wide range and large volume, membrane water treatment technology is favored in the industry and is called "the water treatment technology of the 21st century". At present, with the development of membrane science and technology, membrane separation technology has been applied to varying degrees in the fields of seawater desalination, brackish water desalination, high-purity water preparation, power plant water treatment sewage,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00D01D1/02D01D5/00D01F6/48D01F1/08D01F1/10D01F11/06
Inventor 冯暨伟张博丰沈明忠秦树篷李鸿燕
Owner CHINA HUADIAN ENG
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