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A kind of polyvinylidene fluoride superhydrophilic composite porous membrane and its silver-loaded superhydrophilic membrane preparation method

A polyvinylidene fluoride and hydrophilic membrane technology, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of low production efficiency of superhydrophilic membranes, and achieve durable superhydrophilic performance and long-lasting Antibacterial effect

Inactive Publication Date: 2017-03-01
ZHEJIANG TEXTILE & FASHION COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation efficiency of superhydrophilic membrane is low, and the process conditions are relatively strict

Method used

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  • A kind of polyvinylidene fluoride superhydrophilic composite porous membrane and its silver-loaded superhydrophilic membrane preparation method
  • A kind of polyvinylidene fluoride superhydrophilic composite porous membrane and its silver-loaded superhydrophilic membrane preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0033] (1) The polyvinylidene fluoride that quality is respectively 5g, the phase-splitting polymer polyvinyl chloride of 2g, the solvent N of the pore size regulator polyethylene glycol of 1g and the solvent N of 92g, N-dimethylformamide are dissolved and mixed uniformly, The membrane-forming solution is obtained after vacuum degassing; the membrane-forming solution is passed through a scraper to form a liquid film and then enters a coagulation bath, and the polyvinylidene fluoride composite porous bottom membrane is obtained after solution phase inversion and cleaning.

[0034] (2) Immerse the polyvinylidene fluoride composite porous bottom film prepared in step (1) into a mass percent concentration of 0.3% dopa compound aqueous solution for soaking and reaction for 24 hours, take it out, wash and dry to obtain the polyvinylidene fluoride Superhydrophilic composite porous membrane.

[0035] The surface of the membrane prepared in Example 1-1 had a static water contact angle ...

Embodiment 1-2

[0037] (1) The quality is respectively the polyvinylidene fluoride of 20g, the phase-separated polymer polyethersulfone of 1g, the phase-separated polymer polystyrene / maleic anhydride copolymer of 3g, the pore size regulator diethylene glycol of 5g and the 71g The solvent N, N-dimethylacetamide is dissolved and mixed evenly, and the film-making liquid is obtained after vacuum degassing; the film-making liquid is formed into a liquid film through an extrusion die and then enters the coagulation bath, and the polypolarization is obtained after the solution phase inversion and cleaning. Vinyl fluoride composite porous bottom membrane.

[0038] (2) Immerse the polyvinylidene fluoride composite porous bottom film prepared in step (1) in an aqueous solution of dopamine compound with a concentration of 0.2% by mass, soak and react for 24 hours, take it out, wash and dry to obtain the polyvinylidene fluoride ultra-thin film Hydrophilic composite porous membrane.

[0039] The surface ...

Embodiment 1-3

[0041] (1) The polyvinylidene fluoride that the mass is respectively 10g, the phase-separated polymer polysulfone of 2g, the phase-separated polymer polystyrene of 6g, the pore size regulator polyvinylpyrrolidone of 1g, the pore size regulator polyethylene glycol of 3g Alcohol and the solvent N of 50g, N-dimethylacetamide, the solvent triethyl phosphate of 28g are dissolved and mixed evenly, and the film-making liquid is obtained after vacuum defoaming; The polyvinylidene fluoride composite porous bottom membrane was obtained after solution phase inversion and washing.

[0042] (2) Immerse the polyvinylidene fluoride composite porous bottom film prepared in step (1) in an aqueous solution of dopamine compound with a concentration of 0.15% by mass, soak and react for 24 hours, take it out, wash and dry to obtain the polyvinylidene fluoride ultra-thin film Hydrophilic composite porous membrane.

[0043] The surface of the film prepared in Example 1-3 had a static contact angle ...

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Abstract

The invention discloses a polyvinylidene fluoride super-hydrophilic composite porous membrane and a preparation method of a silver-loaded super-hydrophilic membrane thereof. A blending method and a phase to membrane conversion method are adopted, a micro-nano-level rough surface is formed while the phase conversion is performed between a phase-splitting material and a main material, then the membrane material is soaked in a solution containing dopa compounds to perform surface modification, the surface is modified through the adoption of features of oxidation, auto-agglutination, crosslinking and adhesion of the dopa compounds to prepare the super-hydrophilic membrane, the weak reducibility of polydopa or polydopamine is further used for reducing silver ions, and finally the silver-loaded super-hydrophilic membrane surface is prepared through the reaction of the dopa compounds. The super-hydrophilic surface formed by the method and the silver-loaded super-hydrophilic surface thereof have durable super-hydrophilic performance and antibacterial property.

Description

technical field [0001] The invention relates to the field of surface modification of separation membranes, in particular to a polyvinylidene fluoride superhydrophilic composite porous membrane and a method for preparing the silver-loaded superhydrophilic 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 electroplatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/02B01D67/00
Inventor 王建华
Owner ZHEJIANG TEXTILE & FASHION COLLEGE