A kind of high dielectric constant nanofiltration composite membrane and preparation method thereof

A high dielectric constant, composite membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of electric field loss, prolonging service life and improving water quality

Inactive Publication Date: 2021-11-26
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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  • A kind of high dielectric constant nanofiltration composite membrane and preparation method thereof
  • A kind of high dielectric constant nanofiltration composite membrane and preparation method thereof
  • A kind of high dielectric constant nanofiltration composite membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
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 invention relates to a high dielectric constant nanofiltration composite membrane. The nanofiltration composite membrane includes a porous base film and a polyester amine active layer attached thereon. The porous base film contains a high dielectric constant modifier and For the membrane material, the weight percentage of the high dielectric constant modifier to the membrane material is 1-25%, and the polyester amine active layer includes polyamine monomers. A method for preparing a high dielectric constant nanofiltration composite membrane comprises the following steps: 1) preparation of a modifying agent; 2) preparation of a casting solution; 3) film formation; 4) solidification; and 5) generation of a nanofiltration composite membrane. The high dielectric constant nanofiltration composite membrane and the preparation method of the present invention can well improve the dielectric constant of the nanofiltration composite membrane by adding a high dielectric constant modifier, and can be used in combination with the company's unique DEP power supply. Significantly improve the pollution resistance of the nanofiltration composite membrane. Under the action of dielectrophoresis, the pollutants will be concentrated around the electric field without being adsorbed on the surface of the nanofiltration composite membrane, which will greatly improve the flux of the nanofiltration composite membrane and water quality, etc.

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 Patents(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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