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Method for making PH value-sensitive polyvinylidene fluoride hollow fibre intelligent film and products thereby

A polyvinylidene fluoride and smart membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., to achieve the effects of improving hydrophilicity, easy industrial implementation, and easy cleaning

Inactive Publication Date: 2005-03-16
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report about the intelligent composite membrane that can not only improve the hydrophilicity of the PVDF hollow fiber membrane according to the present invention, but also make it have pH value sensitive characteristics

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Pure water soaking membrane: Soak the dry polyvinylidene fluoride hollow fiber membrane in pure water for 24 hours, so that the surface of the membrane pores is completely infiltrated by water;

[0029] (2) Alkali-treated membrane: 500 ml of KOH solution with a concentration of 70 g was prepared, and 1.7 g of tetrabutylammonium bromide was added to the solution. Put the PVDF membrane into the prepared alkali solution, heat it in a water bath, the reaction temperature is 50°C, and the reaction time is 20 minutes. After alkali treatment, wash the KOH on the surface of PVDF with pure water for use;

[0030] (3) Manufacture composite membrane: prepare 200ml of acrylic acid solution with a concentration of 1mol / L, add 10ml of dimethylformamide solution and mix evenly; put the PVDF hollow fiber membrane treated with alkali into the mixed solution, soak at room temperature for 15 minutes;

[0031] Preparation contains cross-linking agent N, N-methylenebisacrylamide (MBAA)...

Embodiment 2

[0033] (1) with embodiment 1;

[0034] (2) Alkali-treated membrane: 500 ml of KOH solution with a concentration of 60 g was prepared, and 2 g of tetrabutylammonium bromide was added to the solution. Put the PVDF hollow fiber membrane into the prepared alkali solution, heat in a water bath, the reaction temperature is 80°C, and the reaction time is 1min. After alkali treatment, wash the KOH on the surface of PVDF with pure water for use.

[0035] (3) Manufacture of composite membrane: prepare 200 ml of acrylic acid solution with a concentration of 1.5 mol / L, add 10 ml of dimethylformamide solution and mix well. Put the alkali-treated PVDF hollow fiber membrane into the mixed solution and soak at room temperature for 10 minutes. Preparation contains cross-linking agent N, N-methylenebisacrylamide (MBAA) 0.1g and initiator potassium persulfate (K 2 S 2 o 8 ) 0.2g solution in 100ml. Put the acrylic acid-treated fiber membrane in the solution, filled with N 2 After sealing, ...

Embodiment 3

[0037] (1) with embodiment 1;

[0038] (2) Alkali-treated membrane: 500 ml of KOH solution with a concentration of 50 g was prepared, and 1.5 g of tetrabutylammonium bromide was added to the solution. Put the PVDF hollow fiber membrane into the prepared alkali solution, heat in a water bath, the reaction temperature is 70°C, and the reaction time is 10 minutes. After alkali treatment, wash the KOH on the surface of PVDF with pure water for use;

[0039] (3) Manufacture of composite membrane: Prepare 200 ml of acrylic acid solution with a concentration of 1.5 mol / L, add 8 ml of dimethylformamide solution and mix well. Put the alkali-treated PVDF hollow fiber membrane into the mixed solution and soak at room temperature for 10 minutes.

[0040] Preparation contains cross-linking agent N, N-methylenebisacrylamide (MBAA) 0.5g and initiator potassium persulfate (K 2 S 2 o 8 ) 0.2g solution in 100ml. Put the acrylic acid-treated fiber membrane in the solution, filled with N 2...

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PUM

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Abstract

Disclosed is a method for making pH sensitive PVDF hollow fiber intelligent film and products made thereby, wherein the making process comprises the steps of, (1) steeping the film in pure water for 24 hours, (2) preparing 10-20% alkali solution, and charging 3-4gl / L of tetrabutylammonium bromide, charging immersed film in alkali solution, heating by water bath, (3) preparing 1-2 mol / L of AAC solution, charging dimethyl formamide solution by 40-50ml / L, mixing uniformly, charging alkali-treated film in the mixed solution, steeping 10-20 minutes at room temperature, preparing solution of crosslinking agent 0.01-0.09mol / L and K2S2O3 0.1-0.3g, charging the readily made film into the solution, filling N2 and sealing, water-bathing, heating and washing with deionized water, the crosslinking agent is MBAA or diacrylic acid ethylene glycol ester.

Description

technical field [0001] The invention relates to a smart membrane and a preparation method thereof, specifically a preparation method of a pH-sensitive polyvinylidene fluoride hollow fiber smart membrane obtained by grafting and copolymerizing acrylic acid monomers and polyvinylidene fluoride (PADF) membranes and Product technology belongs to the field of functional polymer materials, and the international patent classification number is proposed to be Int.C1 7 C08F 20 / 54. Background technique [0002] Membrane is the core of membrane technology. The chemical properties of the membrane material and the membrane structure play a decisive role in the membrane separation process. Membrane materials must have the following basic functions: good selective permeability; certain hydrophobicity or hydrophilicity; excellent chemical resistance and biodegradation resistance, which can be used for a long time without deterioration; good heat resistance; Mechanical strength and good ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08C08J7/16C08L27/16
Inventor 陈莉王闻宇
Owner TIANJIN POLYTECHNIC UNIV
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