Method for preparing functional polyvinylidene fluoride membrane

A polyvinylidene fluoride membrane and polyvinylidene fluoride technology, applied in the field of separation membranes, can solve the problems of being easily affected by organic matter and microorganisms, low surface energy of PVDF, strong hydrophobicity, etc., and achieve good biocompatibility and degradability properties, good antibacterial properties and hydrophilic properties, and facilitate grafting reactions

Inactive Publication Date: 2020-02-04
周丹丹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to provide a functional polyvinylidene fluoride membrane for the low surface energy and strong hydrophobicity of PVDF, which makes the membrane extremely susceptible to the influence of organic matter and microorganisms during use and causes membrane pollution. preparation method

Method used

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  • Method for preparing functional polyvinylidene fluoride membrane

Examples

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example 1

[0037] Take modified polyvinylidene fluoride powder, modified cellulose acetate, polyvinylpyrrolidone, N,N-dimethylacetamide, and mix modified polyvinylidene fluoride powder, modified cellulose acetate, polyvinylpyrrolidone, N,N- Mix dimethylacetamide, stir at 80°C for 3 hours, let stand for defoaming for 1 hour to obtain casting solution, pour the casting solution on a clean and horizontal glass plate and place it in an oven at 40°C Dry to constant weight, cool to room temperature, and peel off the film to obtain a functional polyvinylidene fluoride film. The preparation steps of modified polyvinylidene fluoride powder are as follows: mix starch and deionized water according to the mass ratio of 1:20, stir and gelatinize to obtain gelatinized starch liquid; add polyvinylidene fluoride powder to the gelatinized starch liquid, Stirring was continued for 1 h under a nitrogen atmosphere at a temperature of 60° C., and cooled to room temperature to obtain modified polyvinylidene f...

example 2

[0039] Take modified polyvinylidene fluoride powder, modified cellulose acetate, polyvinylpyrrolidone, N,N-dimethylacetamide, and mix modified polyvinylidene fluoride powder, modified cellulose acetate, polyvinylpyrrolidone, N,N- Mix dimethylacetamide, stir at 85°C for 3 hours, let it stand for 1 hour to defoam, and get the casting solution. Pour the casting solution on a clean and horizontal glass plate and put it in an oven at 50°C. Dry to constant weight, cool to room temperature, and peel off the film to obtain a functional polyvinylidene fluoride film. The preparation steps of modified polyvinylidene fluoride powder are as follows: mix starch and deionized water according to the mass ratio of 1:20, stir and gelatinize to obtain gelatinized starch liquid; add polyvinylidene fluoride powder to the gelatinized starch liquid, Stirring was continued for 1 h under a nitrogen atmosphere at a temperature of 65° C., and cooled to room temperature to obtain modified polyvinylidene ...

example 3

[0041] Take modified polyvinylidene fluoride powder, modified cellulose acetate, polyvinylpyrrolidone, N,N-dimethylacetamide, and mix modified polyvinylidene fluoride powder, modified cellulose acetate, polyvinylpyrrolidone, N,N- Mix dimethylacetamide, stir at 90°C for 4 hours, let stand for defoaming for 2 hours to obtain casting solution, pour the casting solution on a clean and horizontal glass plate and place it in an oven at 60°C Dry to constant weight, cool to room temperature, and peel off the film to obtain a functional polyvinylidene fluoride film. The preparation steps of modified polyvinylidene fluoride powder are as follows: mix starch and deionized water according to the mass ratio of 1:20, stir and gelatinize to obtain gelatinized starch liquid; add polyvinylidene fluoride powder to the gelatinized starch liquid, Stirring was continued for 2 hours under a nitrogen atmosphere at a temperature of 70°C, and cooled to room temperature to obtain modified polyvinyliden...

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Abstract

The invention relates to a method for preparing a functional polyvinylidene fluoride membrane and belongs to the technical field of separation membranes. The functional polyvinylidene fluoride membrane provided by the invention has good antibacterial properties and hydrophilicity; when titanium dioxide is subjected to photon excitation of certain energy, a photocatalytic reaction can be resulted and a large number of substances with strong oxidization can be generated, the substances with strong oxidization have a series of redox reactions with organic matter to degrade the organic matter, andas microorganisms, including viruses, bacteria and fungi, are composed of organic matter, the titanium dioxide can degrade organic components of the microorganisms under excitation of light to damageor even kill the viruses, bacteria and fungi; and according to the method, modified cellulose acetate is blended with modified polyvinylidene fluoride powder, N, N-dimethyl acetamide is adopted as asolvent, polyvinyl pyrrolidone is adopted as a modification additive, and thus the functional polyvinylidene fluoride membrane with good hydrophilicity and transmissibility is prepared.

Description

technical field [0001] The invention relates to a preparation method of a functional polyvinylidene fluoride membrane, which belongs to the technical field of separation membranes. Background technique [0002] Separation membrane is a kind of membrane material with selective permeation function, which can permeate one or several substances in the fluid, while other substances are not permeated, so as to play the role of concentration and separation and purification. Since the membrane separation technology has many functions such as separation, concentration, purification and refining, and at the same time, it shows the advantages of high efficiency, low energy consumption and no secondary pollution during the use process, especially in the field of saving energy and water resources. It has made outstanding contributions in terms of recyclability, and has produced huge economic and social benefits, and has occupied an important position in today's separation science. In to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D71/34B01D2325/36B01D2325/48
Inventor 周丹丹
Owner 周丹丹
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