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Composite reverse osmosis membrane and preparation method thereof

A technology of reverse osmosis membrane and support membrane, which is applied in the field of composite reverse osmosis membrane and its preparation, can solve the problems of increased cost, high cost, difficulty in improving the bonding strength of the porous support layer and the non-woven fabric layer, etc., and achieves improved water permeability and performance Uniform, binding effect

Active Publication Date: 2013-05-01
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing composite reverse osmosis membrane has high water permeability and desalination rate, since the porous support uses a single material (usually PSf), the adjustment of its microporous structure is generally achieved by adjusting the solvent and non-solvent. More expensive solvents may be used in the preparation process, increasing the cost
Moreover, the bonding strength between the porous support layer and the non-woven fabric layer is difficult to improve

Method used

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  • Composite reverse osmosis membrane and preparation method thereof
  • Composite reverse osmosis membrane and preparation method thereof
  • Composite reverse osmosis membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1, prepare the composite reverse osmosis membrane containing polymer alloy support body

[0033] (1) Preparation of casting solution: add 1g polyphenylsulfone PPSU (number average molecular weight 75000) and 35g polysulfone PSf (number average molecular weight 89000) into 164g DMF respectively, heat and stir for 5 hours, and control the temperature at 70±5℃, A clear and transparent solution was obtained. Put the solution in a 40°C vacuum oven and let it defoam for 18 hours to obtain a casting solution for later use. The total mass percentage of polyphenylsulfone and polysulfone is 18%, and polyphenylsulfone accounts for the total mass percentage of polyphenylsulfone and polyphenylene 2.78% of the total mass of sulfone.

[0034] (2) Preparation of polymer alloy support body: Scrape the casting solution on the non-woven fabric with a scraper, use water as the coagulation bath, and after it is completely gelled, transfer it to a hot water bath at 60°C for annea...

Embodiment 2

[0038] Embodiment 2, the compound reverse osmosis membrane that contains polymer alloy support body is prepared continuously with self-made small test equipment

[0039] (1) Preparation of casting solution: 5g polyphenylsulfone PPSU (number average molecular weight 75000), 165g polysulfone PSf (number average molecular weight 89000), respectively added to 830g DMF, heated and stirred for 5 hours, the temperature was controlled at 70±5℃, A clear and transparent solution was obtained. Put the solution in a vacuum oven at 35°C and let it defoam for 18 hours to obtain a casting solution for later use. The total mass percentage of polyphenylsulfone and polysulfone is 17%, and polyphenylsulfone accounts for the total mass percentage of polyphenylsulfone and polyphenylene sulfone. 2.94% of the total mass of sulfone.

[0040] (2) Continuous preparation of polymer alloy supports:

[0041] The main parameters of the film casting equipment are set as follows: the temperature of the coa...

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Abstract

The invention discloses a composite reverse osmosis membrane and a preparation method thereof. The method comprises the following steps of (1) dissolving polysulfone and polyethylene sulfone in a solvent to obtain a casting membrane liquid, (2) pouring the casting membrane liquid onto non-woven fabric, placing in a coagulating bath for gel membrane forming to obtain a support membrane, and obtaining a support body formed by the non-woven fabric and the support membrane, and (3) steeping the support body in a solution a and a solution b respectively, obtaining a polyamide layer on the support body and obtaining the composite reverse osmosis membrane. Compared with the prior art, a little PPSU (polyphenylsulphone) having better compatibility with a main body material is added to the main body material polysulfone (or polyethersulfone) of the support layer, the original membrane forming condition is changed, a microporous structure and surface pore size distribution of the support body can be regulated, and a macromolecular alloy ultrafiltration membrane with uniform pore size distribution and a complete spongy pore structure can be obtained. The prepared alloying support body can further conduct interfacial polymerization reaction to form the composite reverse osmosis membrane with uniform and stable properties and no defect.

Description

technical field [0001] The invention relates to a composite reverse osmosis membrane and a preparation method thereof, belonging to the technical field of water treatment membrane separation. Background technique [0002] Early reverse osmosis membranes were prepared by casting modified cellulose acetate on porous materials, and the obtained reverse osmosis membranes had low water permeability and desalination rate. Since the commercial application of composite reverse osmosis membrane, it has become the most widely used type of reverse osmosis membrane because of its advantages of high water permeability, low salt permeability and low energy consumption. Existing composite reverse osmosis membrane, its general preparation method is to first scrape coat a layer of polymer material on polyester non-woven fabric to form a porous membrane as a support, and then use interfacial polymerization to form a polyamide surface layer with desalination function (such as US5160619, US427...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D71/56B01D67/00B01D69/12B01D69/10
Inventor 赵宁张小莉徐坚
Owner INST OF CHEM CHINESE ACAD OF SCI
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