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Composite film and its preparation method and application

A composite membrane and supporting membrane technology, applied in the field of water treatment, can solve the problems of ineffective filtration, affect human health, low trace elements, etc., achieve high univalent ion permeability, realize large-scale batch production, increase The effect of specific surface area

Active Publication Date: 2021-09-17
蓝星(杭州)膜工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Traditional household water purifiers are generally divided into two types: one of which contains activated carbon filter elements and PP cotton filter elements. Although this type of water purifier produces a large amount of water, the toxic components in the produced water, such as bacteria and viruses, are not It cannot be effectively filtered, which will affect human health; another water purifier contains a reverse osmosis membrane (RO) filter element, but due to the high rejection rate of monovalent ions and divalent ions by the reverse osmosis membrane, a small amount of Elements are too low, and studies have shown that low trace elements are also detrimental to human health

Method used

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  • Composite film and its preparation method and application
  • Composite film and its preparation method and application
  • Composite film and its preparation method and application

Examples

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preparation example Construction

[0029] The preparation method of composite membrane provided by the invention comprises:

[0030] S1, providing an aqueous phase solution and an oil phase solution, wherein the aqueous phase solution includes polyglycerin and the first polyamine, and the oil phase solution includes polyacid halides;

[0031] S2, providing a support membrane, placing the aqueous phase solution and the oil phase solution on the surface of the support membrane in sequence and performing a first heat treatment to form a first polyamide layer on the surface of the support membrane, wherein the The first polyamide layer also includes unreacted multi-acid halides; and

[0032] S3, provide a functional solution, the functional solution includes a second polyamine and an ionic liquid, place the functional solution on the surface of the first polyamide layer away from the support membrane and perform a second heat treatment to generate a second a polyamide layer, the second polyamide layer extends from...

Embodiment 1

[0060] Mix piperazine, triethylamine, decaglycerin and water evenly to obtain an aqueous phase solution for subsequent use, wherein the mass fraction of piperazine in the aqueous phase solution is 0.25%, the mass fraction of triethylamine is 1.5%, and decamerol The mass fraction of glycerin is 0.2%.

[0061] Mix trimesoyl chloride (TMC) and isoparaffin solvent (Isopar L) uniformly to obtain an oil phase solution for future use, wherein the mass fraction of trimesoyl chloride in the oil phase solution is 0.15%.

[0062] Mix piperazine and 1-butyl-3-methylimidazolium chloride evenly to obtain a functional solution for future use, wherein the mass fraction of piperazine in the functional solution is 0.1%.

[0063] First coat the above water phase solution on the polysulfone support membrane, pour off the excess water phase solution after standing for 60s, and dry the membrane surface with cold wind; then coat the oil phase solution on the above dried membrane surface, and let it ...

Embodiment 2

[0068] Mix piperazine, triethylamine, pentaglycerol and water evenly to obtain an aqueous phase solution for subsequent use, wherein the mass fraction of piperazine in the aqueous phase solution is 0.35%, the mass fraction of triethylamine is 1.5%, and the pentameric The mass fraction of glycerin is 0.35%.

[0069] Mix trimesoyl chloride (TMC) and isoparaffin solvent (Isopar L) uniformly to obtain an oil phase solution for later use, wherein the mass fraction of trimesoyl chloride in the oil phase solution is 0.2%.

[0070] Mix piperazine and 1-butyl-3-methylimidazolium tetrafluoroborate chloride evenly to obtain a functional solution for future use, wherein the mass fraction of piperazine in the functional solution is 0.15%.

[0071] First coat the above water phase solution on the polysulfone support membrane, pour off the excess water phase solution after standing for 60s, and dry the membrane surface with cold wind; then coat the oil phase solution on the above dried membr...

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Abstract

The present invention relates to a composite film and its preparation method and application, wherein the preparation method comprises: providing an aqueous phase solution comprising polyglycerol and a first polyamine and an oil phase solution comprising polyacyl halides; combining the aqueous phase solution and the oil phase The solution is placed on the surface of the support membrane in turn and subjected to the first heat treatment to generate the first polyamide layer; then a functional solution including the second polyamine and the ionic liquid is provided, and the functional solution is placed on the surface of the first polyamide layer and performed The second heat treatment generates a second polyamide layer, the second polyamide layer extends from the inside of the first polyamide layer to the surface of the first polyamide layer, the first polyamide layer and the second polyamide layer constitute a separation layer , to obtain a composite film. The composite membrane obtained by the preparation method of the present invention has extremely high water flux and the removal rate of toxic and harmful substances such as viruses and bacteria, while maintaining a high removal rate of divalent ions and a relatively high permeability of monovalent ions, and can It is better used in water treatment devices such as water purifiers.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a composite membrane and its preparation method and application. Background technique [0002] Traditional household water purifiers are generally divided into two types: one of which contains activated carbon filter elements and PP cotton filter elements. Although this type of water purifier produces a large amount of water, the toxic components in the produced water, such as bacteria and viruses, are not It cannot be effectively filtered, which will affect human health; another water purifier contains a reverse osmosis membrane (RO) filter element, but due to the high rejection rate of monovalent ions and divalent ions by the reverse osmosis membrane, a small amount of Elements are too low, and studies have shown that low trace elements are also detrimental to human health. Contents of the invention [0003] Based on this, it is necessary to provide a composite membr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/68B01D71/56B01D71/06B01D69/12B01D67/00B01D61/02C02F1/44
CPCB01D61/025B01D67/0002B01D69/12B01D71/06B01D71/56B01D71/68C02F1/441
Inventor 陈可可刘文超谭惠芬洪勇琦潘巧明郑宏林
Owner 蓝星(杭州)膜工业有限公司
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