Preparation method of polyvinylidene fluoride hollow fiber ultra-filtration membrane for drinking water treatment

A polyvinylidene fluoride and drinking water treatment technology, applied in the field of hollow fiber membranes, can solve the problems of poor toughness, easy broken wires, and low strength, and achieve the effects of outstanding weather resistance, high retention, and stable performance

Active Publication Date: 2014-03-19
奚韶锋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Hollow fiber membranes produced by the traditional non-solvent phase preparation method (referred to as wet method) have low strength and poor toughness, are easy to break during use, and have a short lifespan. They are not suitable for application in large-scale drinking water treatment projects.

Method used

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  • Preparation method of polyvinylidene fluoride hollow fiber ultra-filtration membrane for drinking water treatment
  • Preparation method of polyvinylidene fluoride hollow fiber ultra-filtration membrane for drinking water treatment
  • Preparation method of polyvinylidene fluoride hollow fiber ultra-filtration membrane for drinking water treatment

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preparation example Construction

[0024] The preparation method of the polyvinylidene fluoride hollow fiber ultrafiltration membrane used for drinking water treatment proposed by the present invention comprises the following steps:

[0025] (1) Dry polyvinylidene fluoride and polyarylene sulfide sulfone in a dryer respectively, the drying temperature is 80-90°C, and the drying time is 24-36 hours;

[0026] (2) Preparation of blended polymer solution for membrane production:

[0027] The mass percent of each component in the blended polymer solution is:

[0028]

[0029] After weighing polyvinylidene fluoride, polyarylene sulfide sulfone, tetraethylene glycol, N-methylpyrrolidone and polyvinylpyrrolidone according to the above ratio, put them in a stirring tank, stir and dissolve at a temperature of 150-170 °C , the stirring time is 14 to 16 hours, the stirring speed is 90 to 110 rpm, and a uniform blended polymer solution is obtained;

[0030] (3) Extrusion and forming of hollow fiber membranes, the speci...

Embodiment 1

[0060] (1) Pretreatment of polymer materials:

[0061] Polyvinylidene fluoride PVDF (molecular weight: 370,000) and polyarylene sulfide sulfone (molecular weight: 70,000) were dried in a dryer at a drying temperature of 85°C.

[0062] (2) Preparation of blended polymer solution:

[0063] The dried polyvinylidene fluoride P 1 , polyarylene sulfide sulfone P 2 , tetraethylene glycol D 1 , N-Methylpyrrolidone D 2 and the additive PVPK90 are weighed according to the mass percentage, and placed in the batching kettle, and the mass percentage (wt%) is P 1 :P 2 :D 1 :D 2 :A=30:6:20:42:2.0 Stir and dissolve at a temperature of 165°C for 15 hours at a stirring speed of 100 rpm to dissolve into a uniform blended polymer solution;

[0064] (3) Extrusion and forming of hollow fiber membrane:

[0065] (3-1) Send the blended polymer solution in step (2) into the twin-screw extruder through the spinning pump, the feeding speed of the raw material is 15 kg / hour, and the temperature o...

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Abstract

The invention relates to a preparation method of a polyvinylidene fluoride hollow fiber ultra-filtration membrane for drinking water treatment and belongs to the technical field of membrane separation and drinking water treatment. The preparation method comprises the following steps: respectively drying polyvinylidene fluoride and polyarylene sulfide sulfone in a drying machine; proportionally weighing the polyvinylidene fluoride, the polyarylene sulfide sulfone, tetraglycol, N-methyl-2-pyrrolidinone and polyvinylpyrrolidone, and putting into a stirring kettle for stirring and dissolving to obtain a uniform blended high polymer solution; extruding the uniform blended high polymer solution through a filter and a spinning pump, and then extruding a hollow nascent fiber from an annular opening mold; performing cooling and solidification through a cold extraction solution; soaking into reverse osmosis water to remove a membrane diluent mixture, and performing airing to obtain a hollow fiber ultra-filtration membrane product. According to the hollow fiber ultra-filtration membrane prepared through the method, raw materials are safe, sanitary and environment-friendly, and are high in heat resistance and chemical stability. The polyvinylidene fluoride hollow fiber ultra-filtration membrane is high in retention, stable in performance and suitable for being applied to municipal drinking water treatment, produced water is good in quality, and when the membrane is used, yarns are not broken.

Description

technical field [0001] The invention relates to a preparation method of a polyvinylidene fluoride hollow fiber ultrafiltration membrane used for drinking water treatment, in particular to a thermally induced phase separation method (thermal method for short) for preparing polyvinylidene fluoride (PVDF) and polyarylene sulfide A hollow fiber membrane blended with ether sulfone (PASS) is used for municipal drinking water treatment and belongs to the technical field of membrane separation and drinking water treatment. Background technique [0002] my country's existing water sources are generally polluted by organic matter, and some areas have compound pollution such as high organic matter and high turbidity. The traditional coagulation-sedimentation-filtration-disinfection process has low filtration accuracy, high usage of disinfectants and coagulants, and has a great impact on water quality. The treated water cannot meet the requirements of the new national standard 106 drink...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/08B01D67/00
Inventor 奚韶锋洪耀良陈翠仙
Owner 奚韶锋
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