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Method for preparing polyvinylidene fluoride membrane by using water-soluble diluent

A water-soluble diluent, polyvinylidene fluoride membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. problems, to achieve good application prospects, simple preparation methods, and high-strength effects

Inactive Publication Date: 2015-04-08
HEZE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problems in the prior art that the reagents used in the preparation method of polyvinylidene fluoride film are not environmentally friendly, the process of recycling water-soluble diluent is complicated, the cost is high and the film strength is low, the invention provides a water-soluble diluent for preparing polyvinylidene fluoride Membrane method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Blend polyvinylidene fluoride with an intrinsic viscosity of 1.67, polyethylene glycol 400 and propylene glycol methyl ether propionate, and its mass fraction composition: polyvinylidene fluoride is 22%, polyethylene glycol 400 is 5%, propylene glycol Methyl ether propionate is 73%. The mixture was heated to 140°C, stirred for 2 hours, and then left to defoam at 140°C for 3 hours. The solution was directly scraped on the support material to form a nascent flat film, the thickness of which was controlled to 400 microns, and it was immersed in a water bath at 20° C. for 60 seconds to solidify and taken out. Fix the film on a two-way synchronous stretching machine and stretch it 1.3×1.3 times at a temperature of 90°C, then immerse the film in a water bath at room temperature to solidify and form a film, and soak the cured film in distilled water for 24 hours, and change it every 8 hours. water once. Then immersed in 50% glycerol aqueous solution for 8 hours, and finally ...

Embodiment 2

[0049]Blend polyvinylidene fluoride with an intrinsic viscosity of 1.67, polyethylene glycol 400 and propylene glycol methyl ether propionate, and its mass fraction composition: polyvinylidene fluoride is 26%, polyethylene glycol 400 is 5%, propylene glycol Methyl ether propionate is 69%. The mixture was heated to 140°C, stirred for 2 hours, and then left to defoam at 140°C for 3 hours. The solution was directly scraped on the support material to form a nascent flat film, the thickness of which was controlled to 400 microns, and it was immersed in a water bath at 20° C. for 50 seconds to solidify and taken out. Fix the film on a two-way synchronous stretching machine and stretch it 1.3×1.3 times at a temperature of 90°C, then immerse the film in a water bath at room temperature to solidify and form a film, and soak the cured film in distilled water for 24 hours, and change it every 8 hours. water once. Then immersed in 50% glycerol aqueous solution for 8 hours, and finally d...

Embodiment 3

[0052] Blend polyvinylidene fluoride with an intrinsic viscosity of 1.67, polyethylene glycol 600 and propylene glycol methyl ether propionate, and its mass fraction composition: polyvinylidene fluoride is 22%, polyethylene glycol 600 is 5%, propylene glycol Methyl ether propionate is 73%. The mixture was heated to 140°C, stirred for 2 hours, and then left to defoam at 140°C for 3 hours. The solution was directly scraped on the support material to form a nascent flat film, the thickness of which was controlled to 400 microns, and it was immersed in a water bath at 20° C. for 60 seconds to solidify and taken out. Fix the film on a two-way synchronous stretching machine and stretch it 1.3×1.3 times at a temperature of 90°C, then immerse the film in a water bath at room temperature to solidify and form a film, and soak the cured film in distilled water for 24 hours, and change it every 8 hours. water once. Then immersed in 50% glycerol aqueous solution for 8 hours, and finally ...

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Abstract

The invention discloses a method for preparing a polyvinylidene fluoride membrane by using a water-soluble diluent and belongs to the field of high polymer materials. The method comprises the following steps: mixing polyvinylidene fluoride, a water-soluble diluent and a water-soluble organic additive, stirring to form a transparent polymer liquid, standing and defoaming; preparing the transparent polymer liquid into a primary membrane, immersing the primary membrane into a cooling liquid, curing and taking out the primary membrane, rapidly heating to a certain temperature, performing two-way synchronous draft treatment on a flat sheet membrane, or performing hot draft treatment on a hollow fiber membrane, finally immersing the membrane into a water bath, and curing to form the membrane; and soaking and drying the membrane, thereby obtaining the polyvinylidene fluoride microporous membrane. The primary membrane cured in the method is subjected to hot draft treatment, and high strength of the membrane is guaranteed; and meanwhile, a single water-soluble diluent is adopted, the diluent is conveniently recycled, the condition that the membrane is cleaned by using alcohols and other reagents is avoided, and the production safety is guaranteed. The membrane is simple in preparation method and can be applied to the fields of sewage treatment, foods and biological pharmacy.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a method for preparing a polyvinylidene fluoride film from a water-soluble diluent. Background technique [0002] With the advancement of science and technology and the development of society, people's requirements for the environment, food, medicine and other fields are gradually increasing. Membrane separation technology has the characteristics of simple process, no secondary pollution, energy saving and high efficiency. And it can be operated continuously at room temperature. It has the advantages of good economy, direct amplification, and special film matching. In recent years, domestic sewage treatment is shifting from the traditional biological treatment method to the combination of membrane process and biological treatment, that is, the membrane bioreactor method. The key technology of this process is a separation membrane with good performance. Polyvinylidene ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D67/00B01D69/08
Inventor 武利顺汪涛王学亮
Owner HEZE UNIV
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