Polyvinylidene fluoride separation film with adjustable film holes and preparation method thereof

A polyvinylidene fluoride, adjustable technology, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of insufficient modification of polyvinylidene fluoride, poor separation performance and pollution resistance , to achieve the effect of easy industrial implementation, simple equipment and simple process

Inactive Publication Date: 2013-03-13
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 high molecular polymer: take 5.0g monomer N-isopropylacrylamide (NIPAM), 0.05g initiator azobisisobutyronitrile (AIBN) and 50ml absolute ethanol, pass N 2 After 30 minutes, the system was sealed and reacted at a constant temperature of 65°C for 8 hours; the solution after the reaction was spin-dried at 55°C and vacuum-dried for 24 hours to obtain the solid product PNIPAM;

[0021] (2) Preparation of casting solution: Dissolve PVDF powder and PNIPAM prepared in step (1) in N,N-dimethylformamide (DMF) in different blending ratios, and stir at 60°C to obtain a completely transparent solution , standing under vacuum conditions for degassing 1h, the obtained PNIPAM content is respectively 0%, 0.5%, 1.5% and 2.5%, and the mass concentration is the casting solution of 16% (wt%);

[0022] (3) Preparation of flat film: Pour the casting solution obtained in step (2) on a dry and smooth glass plate, scrape it evenly with a glass rod to form a film, i...

Embodiment 2

[0024] (1) Preparation of intelligent high molecular polymer: get 5.0g monomer NIPAM, 0.05g initiator 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 the solid product PNIPAM;

[0025] (2) Preparation of casting solution: Dissolve PVDF powder and PNIPAM prepared in step (1) in N,N-dimethylformamide (DMF) in different blending ratios, and stir at 65°C to obtain a completely transparent solution , standing under vacuum conditions for degassing 2h, obtaining PNIPAM content is respectively 0%, 0.5%, 1.5% and 2.5%, and the mass concentration is the casting solution of 16% (wt%);

[0026] (3) Preparation of flat film: Pour the casting solution obtained in step (2) on a dry and smooth glass plate, scrape it evenly with a glass rod to form...

Embodiment 3

[0028] (1) with embodiment 1;

[0029] (2) Preparation of casting solution: Dissolve PVDF powder and PNIPAM prepared in step (1) in N,N-dimethylacetamide (DMAC) in different blending ratios, and stir at 70°C to obtain a completely transparent solution , standing for degassing under vacuum conditions for 2 hours to obtain the casting solution;

[0030] (3) With embodiment 1.

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Abstract

The invention relates to a polyvinylidene fluoride (PVDF) separation film with adjustable film holes and a preparation method thereof. The PVDF separation film comprises the following ingredients in percentage by weight: 0.5 percent to 2.5 percent of intelligent high polymers and 97.5 percent to 99.5 percent of PVDC polymers. The preparation method comprises the following processes of: a. preparation of the intelligent high polymers: dissolving intelligent high polymer monomers into absolute ethyl alcohol to carry out free radical polymerization under the protection of nitrogen gas to obtain the intelligent high polymers; b. film casting solution preparation: dispersing the intelligent high polymers obtained in the step a into organic solvents, gradually adding a certain amount of PVDF powder, dissolving and degasifying to obtain the film cast solution; and c, preparation of flat plate films: scrapping the film cast liquid obtained in step b on a clean and smooth glass plate to form liquid films and curing the liquid films in curing solution to obtain the films. The diameters of the holes of the PVDF flat plate film prepared by the preparation method are 100 nm to 300nm, the inner surfaces of the holes are formed by the intelligent high polymers, and the intelligent high polymers can generate response according to the separated environment condition change so that the dimension of the holes of the PVDF flat plate film changes. The PVDF flat plate film can be used for the intelligence separation of objects to be separated.

Description

technical field [0001] The invention relates to a separation membrane with adjustable membrane pores and a preparation method thereof, in particular to a polyvinylidene fluoride membrane with adjustable membrane pores obtained by blending a polymer sensitive to temperature or pH with polyvinylidene fluoride (PVDF) The invention and a preparation method thereof 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 mem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/06
Inventor 陈熙陈莉赵义平陈蓓蓓宋其梦
Owner TIANJIN POLYTECHNIC UNIV
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