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A self-cleaning polyvinylidene fluoride microporous membrane and its preparation method

A technology of polyvinylidene fluoride and microporous membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems affecting the strength of hollow fiber membranes, achieve high strength, good cleaning effect, and prepare The effect of simple method

Inactive Publication Date: 2017-09-29
HUNAN OVAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flux of the hollow fiber membrane and the flux recovery rate of the hollow fiber membrane after washing with water still need to be further improved, and the addition of acrylic acid, a hydrophilic structural unit, will inevitably affect the membrane strength of the hollow fiber membrane.

Method used

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  • A self-cleaning polyvinylidene fluoride microporous membrane and its preparation method
  • A self-cleaning polyvinylidene fluoride microporous membrane and its preparation method
  • A self-cleaning polyvinylidene fluoride microporous membrane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation steps of the self-cleaning polyvinylidene fluoride flat microporous membrane are as follows:

[0031](1) Polyvinylidene fluoride, thermosensitive amphiphilic copolymer poly(N-isopropylacrylamide-r-methyl methacrylate) P(NIPAAM-r-MMA), porogen and solvent at temperature Stir evenly at 60°C, and obtain the casting solution after filtration and vacuum defoaming;

[0032] The mass percentages of polyvinylidene fluoride, thermosensitive amphiphilic copolymer poly(N-isopropylacrylamide-r-methyl methacrylate) P(NIPAAM-r-MMA), porogen and solvent are respectively: 14%, 1.5%, 8%, 76.5%, the molecular weight of PVDF is 6.9×10 5 , the thermosensitive amphiphilic copolymer poly(N-isopropylacrylamide-r-methyl methacrylate) P(NIPAAM-r-MMA) has a molecular weight of 1.5×10 4 The porogen is a mixture of polyethylene glycol 400 (5wt%) and polyvinylpyrrolidone K30 (3wt%); the solvent is N,N-dimethylformamide (DMF); the temperature sensitivity Amphiphilic copolymer poly...

Embodiment 2

[0041] The preparation steps of the self-cleaning polyvinylidene fluoride flat microporous membrane in Example 2 are the same as in Example 1, but the composition, preparation conditions and film-making conditions of the casting solution are different from those in Example 1, see Table 2 for details.

[0042] Table 2

[0043]

[0044]

Embodiment 3

[0046] The preparation steps of the self-cleaning polyvinylidene fluoride flat microporous membrane in Example 3 are the same as in Example 1, but the composition, preparation conditions and film-making conditions of the casting solution are different from those in Example 1, see Table 3 for details.

[0047] table 3

[0048]

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Abstract

The invention provides a self-cleaning polyvinylidene fluoride microporous membrane and a preparation method thereof, the method comprising polyvinylidene fluoride, a temperature-sensitive amphiphilic copolymer poly(N-isopropylacrylamide-methacrylic acid) Methyl ester), porogen, and solvent are stirred evenly at a temperature of 60-90°C, and the casting solution is obtained after filtration and vacuum degassing; then the casting solution is passed through a film-making mechanism, and immersed in a coagulation bath for finalization , washed in a hot water bath, and dried to obtain the self-cleaning polyvinylidene fluoride microporous membrane; wherein the mass percentages of the polyvinylidene fluoride, temperature-sensitive amphiphilic copolymer, porogen and solvent are respectively 13- 20%, 0.1-5%, 1-15% and 60-80%, and the molecular weight of the temperature-sensitive amphiphilic copolymer is 1×103˜5×104. The polyvinylidene fluoride microporous membrane prepared by the invention has the advantages of self-cleaning property, hydrophilicity, high flux, high flux recovery rate and high strength, and the preparation method is simple, and industrial production can be realized.

Description

technical field [0001] The invention relates to the technical field of polymer membrane preparation and membrane separation, in particular to a self-cleaning polyvinylidene fluoride microporous membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a crystalline polymer with appropriate C-F bond length, high bond energy, excellent mechanical properties, good chemical stability and heat resistance, and is one of the preferred materials for preparing separation membranes. However, due to the low surface energy of PVDF and its strong hydrophobicity, the prepared ultrafiltration, microfiltration and other porous membranes have poor surface hydrophilicity. When used as a water treatment membrane material, it is easy to generate adsorption fouling and reduce the service life of the membrane. Therefore, in order to improve the anti-pollution ability and prolong the service life, it is necessary to carry out hydrophilic anti-pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/06B01D67/00
Inventor 胡群辉路宏伟彭博喻慧贺攀王进
Owner HUNAN OVAY TECH CO LTD
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