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Method for preparing super-hydrophilic polyvinylidene fluoride membrane

A polyvinylidene fluoride membrane, super-hydrophilic technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of nano-TiO easy to fall off, unstable super-hydrophilic performance, weak adsorption force, etc. problems, to achieve the effects of easy operation and implementation, improved mechanical properties and heat resistance, and low energy consumption

Active Publication Date: 2011-11-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the weak adsorption force, nano-TiO 2 It is easy to fall off during the application process, making the superhydrophilic performance of the membrane unstable, and the shedding nano-TiO 2 also pose a potential threat to the environment

Method used

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  • Method for preparing super-hydrophilic polyvinylidene fluoride membrane
  • Method for preparing super-hydrophilic polyvinylidene fluoride membrane
  • Method for preparing super-hydrophilic polyvinylidene fluoride membrane

Examples

Experimental program
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Effect test

preparation example Construction

[0017] The steps of the preparation method of superhydrophilic polyvinylidene fluoride membrane are as follows:

[0018] 1) Polyvinylidene fluoride with a mass percentage of 10% to 20%, a copolymer containing maleic anhydride with a mass percentage of 2 to 4%, a pore size regulator with a mass percentage of 1 to 2% and a mass percentage of 74% ~87% of the solvent is mixed and stirred evenly under the protection of an inert gas, and the film-forming liquid is obtained after vacuum defoaming;

[0019] 2) Use ethanol as the coagulation bath to obtain the polyvinylidene fluoride film through solution phase inversion;

[0020] 3) Soak the polyvinylidene fluoride membrane in the aminosilane solution for 4 to 6 days, take it out and dry it to obtain a superhydrophilic polyvinylidene fluoride membrane.

[0021] The described copolymer containing maleic anhydride is styrene / maleic anhydride copolymer, methyl methacrylate / maleic anhydride or vinyl acetate / maleic anhydride copolymer. T...

Embodiment 1

[0026] Example 1. The preparation of PVDF and styrene / maleic anhydride copolymer blended super-hydrophilic membrane, the specific steps are: 1) the mass percentage is 10% PVDF, and the mass percentage is 2% styrene / maleic anhydride The copolymer, the pore size regulator PVP with a mass percentage of 1% and the solvent DMF with a mass percentage of 87% were mixed and stirred evenly under the protection of an inert gas, and the film-forming liquid was obtained after vacuum defoaming; 2) the obtained in 1) 3) Immerse the PVDF membrane obtained in 2) in the tetrahydrofuran (THF) solution of aminosilane for 4-6 days, take out Dry to obtain superhydrophilic PVDF membrane. Table 1 shows the components, mass content and film types in the film-making solution and aminosilane solution.

[0027] Table 1

[0028]

Embodiment 2

[0029] Embodiment 2. The preparation of PVDF and methyl methacrylate / maleic anhydride copolymer blending super-hydrophilic membrane, concrete steps are with embodiment 1. Table 2 shows the components, mass content and film types in the film-making solution and aminosilane solution.

[0030] Table 2

[0031]

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Abstract

The invention discloses a method for preparing a super-hydrophilic polyvinylidene fluoride membrane. The method comprises the following steps: 1) mixing polyvinylidene fluoride, a copolymer containing maleic anhydride, a solvent and an aperture regulator, and then performing vacuum de-foaming to obtain a membrane preparing solution; 2) performing phase inversion on the acquired membrane in the presence of alcohol used as a coagulating bath to obtain a polyvinylidene fluoride membrane; and 3) soaking the obtained polyvinylidene fluoride membrane in an amino silane solution for a period of timeto obtain the super-hydrophilic polyvinylidene fluoride membrane. The super-hydrophilic polyvinylidene fluoride membrane prepared by using the method has the advantages that the preparation cost is low, the process is simple, the super-hydrophilic property of the membrane is more stable because of an organic inorganic hybridized membrane surface, and the membrane has better mechanical property and thermal property because of the use of the hybridized materials.

Description

technical field [0001] The invention relates to the field of surface modification of separation membranes, in particular to a preparation method of a superhydrophilic polyvinylidene fluoride membrane. Background technique [0002] The surface with superhydrophilicity will endow materials with unique properties, which have important applications and have received extensive attention and research. Superhydrophilic surfaces are generally obtained by constructing micro-nano-scale rough surfaces with certain hydrophilic properties, among which nano-TiO 2 The structured superhydrophilic surface dominates. There are many methods for preparing super-hydrophilic surfaces. For example, patent CN201010120791.3 discloses a super-hydrophilic multifunctional coating surface and its preparation method. Surface composite composition of metal particles composed of copper and copper alloy prepared by substrate and electroplating method; patent CN200910043839.2 discloses a self-cleaning supe...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D67/00
Inventor 徐又一王建华朱宝库朱利平
Owner ZHEJIANG UNIV
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