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Temperature sensitive polyvinylidene fluoride gel film and preparation method thereof

A technology of polyvinylidene fluoride gel membrane and isopropylacrylamide gel, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of insufficient modification of polyvinylidene fluoride and separation performance and poor pollution resistance, etc., to achieve the effect of easy industrial implementation, simple equipment and simple process

Inactive Publication Date: 2013-03-27
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the existing polyvinylidene fluoride (PVDF) membrane pore functional modification degree is not enough, and the separation performance and pollution resistance are not good.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Preparation of intelligent polymer gel: take 5.0g monomer N-isopropylacrylamide (NIPAM), 0.05g initiator azobisisobutyronitrile (AIBN), crosslinking agent N, N' - Methylenebisacrylamide (MBAA) 0.3g and 500ml absolute ethanol, pass N 2 After 30 minutes, the system was sealed and reacted at a constant temperature of 70°C for 8 hours; the solution after the reaction was spin-dried at 55°C and vacuum-dried for 24 hours to obtain a solid product PNIPAM gel;

[0021] (2) Preparation of casting solution: Dissolve PVDF powder and PNIPAM gel prepared in step (1) in N,N-dimethylformamide (DMF) in different blending ratios, and stir at 65°C to obtain complete transparency The solution of the solution was left to defoam under vacuum conditions for 2h to obtain a PNIPAM gel content of 0%, 0.5%, 1.5% and 2.5%, and a mass concentration of 16% (wt%) casting solution;

[0022] (3) Gel film preparation: Pour the casting solution obtained in step (2) onto a dry, smooth glass plate, s...

Embodiment 2

[0024] (1) with embodiment 1;

[0025] (2) Preparation of casting solution: dissolve PVDF powder and PNIPAM gel prepared in step (1) in N-methylpyrrolidone in different blending ratios, stir at 75°C to obtain a completely transparent solution, and statically Put defoaming 3h, obtain PNIPAM gel content and be respectively 0%, 0.5%, 1.5% and 2.5%, mass concentration is the casting solution of 16% (wt%);

[0026] (3) with embodiment 1.

Embodiment 3

[0028] (1) with embodiment 1;

[0029] (2) Preparation of casting solution: the PVDF powder and the PNIPAM gel prepared in step (1) are dissolved in N,N-dimethylacetamide in different blending ratios, stirred at 75°C to obtain a completely transparent solution, Leave standstill under vacuum condition for defoaming 3h, obtain PNIPAM gel content to be respectively 0%, 0.5%, 1.5% and 2.5%, mass concentration be the casting solution of 16% (wt%);

[0030] (3) with embodiment 1.

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Abstract

The invention relates to a temperature sensitive polyvinylidene fluoride (PVDF) gel film and a preparation method thereof. The temperature sensitive PVDF gel film comprises the following components in percentage by weight: 0.5-2.5 percent of temperature sensitive high polymer gel and 97.5-99.5 percent of PVDF polymer. The preparation method comprises the steps of: a, preparing the temperature sensitive high polymer gel: dissolving a temperature sensitive polymer monomer and a crosslinking agent into absolute ethyl alcohol, carrying out radical polymerization under the protection of nitrogen to obtain the temperature sensitive high polymer gel; b, preparing a film casting solution, dispersing the temperature sensitive high polymer gel obtained from the step a in an organic solvent, gradually adding a certain quantity of PVDF powder, dissolving, degassing to obtain the film casting solution; and c, preparing the gel film: scraping the film casting solution obtained from the step b on a clean and flat glass plate to form a liquid film, curing in a curing bath to form the film. The PVDF gel film prepared by using the method has aperture size ranging from 100 to 300nm, the surface in a hole of the PVDF gel film consists of the temperature sensitive high polymer gel, the temperature sensitive high polymer gel can generate response according to the environment temperature change so as to cause that the film hole size is changed; and the invention can be used in intelligent selective separation of separated matters.

Description

technical field [0001] The invention relates to a temperature-sensitive gel film and a preparation method thereof, in particular to a temperature-sensitive high molecular polymer gel blended with polyvinylidene fluoride (PVDF) to obtain polyvinylidene fluoride whose film pores can be adjusted with temperature The vinyl gel film and its preparation method belong to the field of polymer science and technology. Background technique [0002] Polyvinylidene fluoride (PVDF) has excellent aging resistance and UV resistance, and has good chemical stability. It is not corroded by strong oxidants such as acids and alkalis and halogens at room temperature. It also has excellent thermal stability and mechanical strength. It is a Separation membrane material with good comprehensive performance. At present, PVDF separation membranes have been successfully and widely used in chemical, biochemical, electronics, food, textile and other industrial fields. However, hydrophobic PVDF membranes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/16C08L33/24C08L33/14C08J5/18B01D71/34B01D67/00
Inventor 陈熙陈莉赵义平陈蓓蓓宋其梦
Owner TIANJIN POLYTECHNIC UNIV
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