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

A technology of polyvinylidene fluoride and smart membrane, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc. It can solve the problems of not having the advantages of hollow fibers, increased filtration pressure, and being too soft, and it is easy to implement industrially , low filtration pressure, easy to clean

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

However, PNI PA hydrogel also has disadvantages: it is too soft in the swollen state, and it is difficult to shape; at the same time, the volume change of the gel is relatively slow
[0015] It can be seen from the existing literature that the temperature-sensitive PVDF smart film is prepared by phase transition method, thermal initiation method or irradiation method to prepare temperature-sensitive PVDF smart film, and the prepared temperature-sensitive PVDF smart film is flat plate. The membrane does not have the advantages of hollow fibers, and the temperature-sensitive PVDF smart membrane made in this way will graft long polymer chains on the membrane surface or membrane pores to reduce the flux of the membrane and significantly increase the filtration pressure, thus affecting the membrane itself. Put forward higher requirements, make the production method complex, increase the cost, and limit the application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Pure water infiltration membrane: soak the dried polyvinylidene fluoride hollow fiber membrane in pure water for 24 hours, so that the surface of the membrane pores is completely infiltrated with water;

[0033] (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. The PVDF membrane was put into the prepared alkaline solution, heated in a water bath, the reaction temperature was 50 °C, and the reaction time was 20 min. After the alkali treatment, the KOH on the PVDF surface was washed with pure water for later use.

[0034] (3) Manufacturing composite membrane: prepare 200ml of N-isopropylacrylamide (NIPA) solution with a concentration of 1mol / L, add 10ml of dimethylformamide solution and mix evenly; put the alkali-treated PVDF membrane into the mixed solution , soak at room temperature for 15 minutes;

[0035] Preparation containing cross-linking agent N, N...

Embodiment 2

[0037] (1) with embodiment 1;

[0038] (2) Alkali-treated membrane: prepare 500 ml of a KOH solution with a concentration of 60 g, and add 2 g of tetrabutylammonium bromide to the solution. The PVDF hollow fiber membrane was put into the prepared alkaline solution, heated in a water bath, the reaction temperature was 80 °C, and the reaction time was 1 min. After the alkali treatment, wash the KOH on the PVDF surface with pure water for later use;

[0039] (3) Same as Example 1.

Embodiment 3

[0041] (1) Same as Example 1

[0042] (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. The PVDF hollow fiber membrane was put into the prepared alkaline solution, heated in a water bath, the reaction temperature was 70 °C, and the reaction time was 10 min. After the alkali treatment, wash the KOH on the PVDF surface with pure water for later use;

[0043] (3) Manufacture of composite membrane: prepare 200 ml of N-isopropylacrylamide (NIPA) solution with a concentration of 1.5 mol / L, add 8 ml of dimethylformamide solution and mix evenly. Put the alkali-treated PVDF hollow fiber membrane into the mixed solution and soak it at room temperature for 10 minutes;

[0044] Preparation containing cross-linking agent N, N-methylenebisacrylamide (MBAA) 0.5g and initiator potassium persulfate (K 2 S 2 O 8 ) 0.2g of solution 100ml. The solution of N-isopropylacrylamide (NI...

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Abstract

Disclosed is a method for making temperature-sensitive PVDF hollow fibre intelligent film and products made by chemical grafting and copolymerization of NIPA on PVDF film surface, and 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, water-bathing, heating and washing for later use, the alkali solution is one of KOH, NaOH or LiOH, (3) preparing 1-2 mol / L of NIPA solution, charging dimethyl formamide solution by 40-50ml / L, mixing uniformly, charging alkali-treated film in the mixed solution, steeping 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 film and a preparation method thereof, in particular to a temperature-sensitive and temperature-responsive N-isopropylacrylamide (NIPA) and a polyvinylidene fluoride (PADF) film by graft copolymerization to obtain polyvinylidene fluoride Ethylene smart film and its preparation method technology belong to the field of functional polymer materials, and the international patent classification number is proposed to be Int.C1 7 CO8F 20 / 54. Background technique [0002] Membrane is the core of membrane technology. The chemical properties and membrane structure of the membrane material play a decisive role in the membrane separation process. The membrane material must have the following basic functions: good selective permeability; certain hydrophobicity or hydrophilicity; excellent chemical resistance and biodegradation resistance, durable use without deterioration; good heat resistance; Mechanical strength and good worka...

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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