Reverse osmosis membrane, preparation method and applications thereof

A reverse osmosis membrane and support layer technology, applied in the field of separation membranes, can solve the problems of poor pollution resistance of reverse osmosis membranes, and achieve the effects of improving anti-pollution ability, hydrophilicity, and salt interception rate

Inactive Publication Date: 2019-04-30
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to overcome the defect of poor pollution resistance of the existing reverse osmosis membrane, and provide a kind of reverse osmosis

Method used

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  • Reverse osmosis membrane, preparation method and applications thereof

Examples

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preparation example Construction

[0041] The present invention also provides a method for preparing the above-mentioned reverse osmosis membrane, the method comprising: in the presence of a curing accelerator, contacting the support layer with polyamines, ammonium salts containing epoxy groups, and polyacyl chlorides for interfacial polymerization to form a separation layer , and make the epoxy group in the ammonium salt containing epoxy group cross-linking reaction with polyamide.

[0042] Through the preparation method of the present invention, while forming the separation layer, the polyamide of the separation layer can be cross-linked with the epoxy group in the ammonium salt containing epoxy groups to finally form a modified separation layer.

[0043]According to a preferred embodiment of the present invention, the steps of the interfacial polymerization and the crosslinking reaction include: first mixing the support layer with an aqueous phase containing polyamines, ammonium salts containing epoxy groups,...

Embodiment 1

[0081] This example is used to illustrate the reverse osmosis membrane provided by the present invention and its preparation method.

[0082] The upper surface of the polysulfone porous membrane (the surface of the polysulfone layer, the same below) was contacted with an aqueous solution containing 2% by weight of m-phenylenediamine, 1% by weight of 2,3-epoxypropyltrimethylammonium chloride and 0.1% by weight 2,4,6-tris(dimethylaminomethyl)phenol, drained after contacting at 25°C for 10s; then, the upper surface of the polysulfone porous membrane was contacted with an Isopar E solution containing 0.1% by weight of trimesoyl chloride, Drain after contacting at 25°C for 10s; then, put the membrane into an oven and heat at 70°C for 5 minutes to obtain a composite reverse osmosis membrane M1, in which the thickness of the separation layer is 115nm.

Embodiment 2

[0084] This example is used to illustrate the composite reverse osmosis membrane provided by the present invention and its preparation method.

[0085] The upper surface of the polysulfone porous membrane was contacted with an aqueous solution containing 2% by weight of m-phenylenediamine, 5% by weight of 2,3-epoxypropyltriethylammonium chloride and 0.5% by weight of 2,4,6-tri( Dimethylaminomethyl) phenol, after contacting for 10s at 25°C, discharge; then, contact the upper surface of the polysulfone porous membrane with an Isopar E solution containing 0.1% by weight of trimesoyl chloride, and discharge after contacting for 10s at 25°C; Then, the membrane was put into an oven and heated at 100° C. for 3 minutes to obtain a composite reverse osmosis membrane M2, wherein the thickness of the separation layer was 118 nm.

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Abstract

The invention relates to the field of separation membranes, and discloses a reverse osmosis membrane and a preparation method thereof, and applications of the reverse osmosis membrane in water treatment. The reverse osmosis membrane comprises a support layer and a polyamide separation layer, wherein one surface of the polyamide separation layer is attached to the support layer, and the polyamide separation layer is obtained by carrying out interface polymerization on polyamine, an epoxy group-containing ammonium salt and polyacyl chloride in the presence of a curing accelerator. According to the present invention, the ammonium salt group is fixed into the polyamide separation layer, such that the hydrophilicity of the membrane is improved, the membrane surface is positively charged, and the anti-pollution ability of the membrane to the cationic surfactant or other positively charged pollutants is improved; and by crosslinking the epoxy group in the epoxy group-containing ammonium saltand the polyamide, the cross-linking density of the separation layer of the reverse osmosis membrane is increased so as to further improve the salt retention rate of the membrane.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a reverse osmosis membrane, a preparation method of the reverse osmosis membrane and an application of the reverse osmosis membrane in a water treatment process. Background technique [0002] Membrane separation technology is a new separation technology that appeared in the early 20th century and rose rapidly after the 1960s. Because membrane separation technology not only has the functions of separation, concentration, purification and refining, but also has the characteristics of high efficiency, energy saving, environmental protection, molecular level filtration, simple filtration process, and easy control, it is widely used in food, medicine, biology, environmental protection, etc. , chemical industry, metallurgy, energy, petroleum, water treatment, electronics, bionics and other fields have produced huge economic and social benefits, and have become one of the most import...

Claims

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Application Information

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IPC IPC(8): B01D69/02B01D69/12B01D69/10B01D71/56B01D67/00B01D61/02C02F1/44
CPCB01D61/025B01D67/0006B01D69/02B01D69/10B01D69/125B01D71/56B01D2325/36C02F1/441
Inventor 张杨徐健刘轶群潘国元严昊
Owner CHINA PETROLEUM & CHEM CORP
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