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High dielectric constant nano-filtration composite film and preparation method thereof

A high dielectric constant, composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of reduced separation performance, reduced membrane service life, and restrictions on the application of water treatment, to reduce The effect of electric field loss, prolonging service life, and avoiding concentration polarization phenomenon

Inactive Publication Date: 2017-08-29
INNER MONGOLIA TIANYI ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Membrane fouling is a major obstacle restricting the popularization and application of membrane technology
When filtering pollutants in water, the pollutants are easily adsorbed on the surface of the membrane and in the pores of the membrane, resulting in a decrease in the separation performance of the membrane, reducing the service life of the membrane, and restricting its application in the field of water treatment.

Method used

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  • High dielectric constant nano-filtration composite film and preparation method thereof
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  • High dielectric constant nano-filtration composite film and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A high dielectric constant nanofiltration composite membrane, comprising a porous base membrane and a polyester amine active layer attached thereon, wherein the porous base membrane includes calcium copper titanate and polyvinylidene fluoride, and the polyester amine active layer includes m-phenylene difluoride Amine, p-phenylenediamine polyamine monomer.

[0044] The composition and weight of the raw material of the porous base membrane are:

[0045]

[0046] The aqueous solution component and weight thereof of the raw material of polyester amine active layer are:

[0047]

[0048] In order to control the acid-base balance to promote the reaction, camphorsulfonic acid is added to the aqueous solution as a pH regulator, which can make the polyamine aqueous solution adhere better to the surface of the porous substrate.

[0049] A high dielectric constant nanofiltration composite membrane, the preparation method of which is:

[0050] 1) Modifier preparation: vacuu...

Embodiment 2

[0061] A high dielectric constant nanofiltration composite membrane, comprising a porous base membrane and a polyester amine active layer attached thereon, wherein the porous base membrane includes barium titanate, titanium dioxide and polyvinylidene fluoride, and the polyester amine active layer includes p-phenylene Ethylenediamine, piperazine polyamine monomer.

[0062] The components of the raw materials of the nanofiltration composite membrane and their weight and number ratios are:

[0063]

[0064] The aqueous solution component and weight thereof of the raw material of polyester amine active layer are:

[0065]

[0066]

[0067] A high dielectric constant nanofiltration composite membrane, the preparation method of which is:

[0068] 1) Modifier preparation: the mixture of barium titanate and titanium dioxide was vacuum-dried at 150° C. for 24 hours, and the dried mixture of barium titanate and titanium dioxide was collected.

[0069] 2) Preparation of castin...

Embodiment 3

[0079] A high dielectric constant nanofiltration composite membrane, comprising a porous base membrane and a polyester amine active layer attached thereto, wherein the porous base membrane includes titanium dioxide, barium strontium titanate and polyvinylidene fluoride, and the polyester amine active layer includes homogeneous Benzene triamine polyamine monomer.

[0080] The components of the raw materials of the nanofiltration composite membrane and their weight and number ratios are:

[0081]

[0082]

[0083] The aqueous solution component and weight thereof of the raw material of polyester amine active layer are:

[0084]

[0085] A high dielectric constant nanofiltration composite membrane, the preparation method of which is:

[0086] 1) Modifier preparation: titanium dioxide and barium strontium titanate were vacuum-dried at 150° C. for 24 hours, and the dried calcium copper titanate was collected.

[0087] 2) Preparation of casting solution: Take 0.8Kg of tit...

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Abstract

The present invention relates to a high dielectric constant nano-filtration composite film, which comprises a porous base film and a polyester amine active layer attached onto the porous base film, wherein the porous base film contains a high dielectric constant modifier and a film material, a weight ratio of the high dielectric constant modifier to the film material is 1-25%, and the polyester amine active layer comprises a polyamine monomer. The preparation method of the high dielectric constant nano-filtration composite film comprises: 1) modifier preparation; 2) film casting liquid preparation; 3) film formation; 4) curing; and 5) nano-filtration composite film forming. According to the present invention, by adding the high dielectric constant modifier, the dielectric constant of the nano-filtration composite film can be well improved; by combining the high dielectric constant nano-filtration composite film and the unique DEP power supply of our company, the pollution resistance of the nano-filtration composite film can be significantly improved; and under the action of dielectric electrophoresis, the pollutants can be enriched around the electric field and cannot be adsorbed onto the surface of the nano-filtration composite film, such that the flux of the nano-filtration composite film, the quality of the produced water and the like can be substantially improved.

Description

technical field [0001] The invention relates to the technical field of membrane material preparation and modification, in particular to a high dielectric constant nanofiltration composite membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride (PVDF) is a thermoplastic semi-crystalline high polymer, which is formed by the copolymerization of vinylidene fluoride homopolymer or vinylidene fluoride and hexafluoropropylene. Polyvinylidene fluoride (PVDF) material itself has the advantages of high mechanical strength, corrosion resistance, oxidation resistance, stable chemical properties, and safe use, and is a membrane material with excellent performance. Compared with polymer organic membrane materials such as polyvinyl chloride (PVC), high-density polyethylene (HDPE), polypropylene (PP) and polyethersulfone (PES), no matter in terms of acid and alkali resistance, oxidation resistance and resistance In terms of organic solvents, the tol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/58B01D69/12B01D67/00
CPCB01D67/0016B01D69/12B01D71/58
Inventor 王冰盛晓颖
Owner INNER MONGOLIA TIANYI ENVIRONMENTAL TECH
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