Composite reverse osmosis membrane and preparation method thereof

A technology of reverse osmosis membrane and base membrane, which is applied in the field of composite reverse osmosis membrane and its preparation, and can solve the problems of further improvement of high temperature resistance, complicated reverse osmosis membrane components and manufacturing process, etc.

Inactive Publication Date: 2021-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CN107126851A discloses a composite reverse osmosis membrane, comprising a support layer, a functional film layer and an anti-pollution layer, wherein the support layer is a mixture of fluoropolyaryletherketone and silane-modified polyaryletherketone, and the functional film layer is The polyamide layer, the anti-pollution layer is a modified polyvinyl alcohol layer; the polyamide layer also contains graphene oxide, and the performance of the composite reverse osmosis membrane provided is relatively stable at 40 ° C for a long time, but the reverse osmosis membrane The components and manufacturing process are more complex, and the high temperature resistance of the film still needs to be further improved

Method used

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

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preparation example Construction

[0026] According to the second aspect of the present invention, the present invention provides a kind of preparation method of composite reverse osmosis membrane, and this preparation method comprises the following steps:

[0027] (1) Preparation of casting solution

[0028] mixing polyaryletherketone containing phenolphthalein side groups, a porogen, and a solvent, dissolving the polyaryletherketone containing phenolphthalein sidegroups in the solvent, filtering and defoaming in sequence to obtain a casting solution;

[0029] (2) Dry-wet preparation of supporting basement membrane

[0030] The casting solution is coated on the polyester non-woven fabric as the support layer, after evaporation, it is immersed in a water bath (for example, a deionized water bath) or an ethanol bath to pre-cure to form a film, and then further solidified, so that the support layer A basement membrane layer is formed on the basement membrane to obtain a supporting basement membrane;

[0031] (3...

Embodiment 1

[0066] This example is used to illustrate the composite reverse osmosis membrane of the present invention and its preparation method.

[0067] (1) Preparation of casting solution

[0068] Mix PEK-C, PVP-K30 and DMAc in a mass ratio of 10:1:89, stir at 60°C for 20 hours to completely dissolve PEK-C in the solvent to obtain a uniform mixture, filter the mixture to remove insoluble Impurities are finally left to stand for 30 hours to degas to obtain the casting solution.

[0069] (2) Dry-wet preparation of supporting basement membrane

[0070] Apply the casting solution prepared in step (1) to the polyester non-woven fabric with a film scraper, evaporate at room temperature for 10 seconds, immerse in a 30°C deionized water bath for 10 minutes to pre-cure to form a film, and then soak in a 30°C deionized water for 48 hours to form a basement membrane layer on the support layer to obtain a support basement membrane.

[0071] (3) Generate functional layer

[0072] Dissolving m-p...

Embodiment 2

[0078] This example is used to illustrate the composite reverse osmosis membrane of the present invention and its preparation method.

[0079] (1) Preparation of casting solution

[0080] Mix PEK-C, PEG-400 and DMF in a mass ratio of 15:3:82, stir at 70°C for 15 hours to completely dissolve PEK-C in the solvent to obtain a uniform mixture, filter the mixture to remove insoluble Impurities, and finally put it under vacuum for 2h to defoam to obtain the casting solution.

[0081] (2) Dry-wet preparation of supporting basement membrane

[0082] Apply the casting solution prepared in step (1) onto the polyester non-woven fabric with a film scraper, evaporate at room temperature for 1 min, immerse in a 60°C deionized water bath for 5 min to pre-cure to form a film, and then soak in a 25°C deionized water for 72 hours to form a basement membrane layer on the support layer to obtain a support basement membrane.

[0083] (3) Generate functional layer

[0084] Dissolving m-phenylen...

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Abstract

The invention relates to the technical field of water treatment membrane separation, and discloses a composite reverse osmosis membrane and a preparation method thereof. The composite reverse osmosis membrane comprises a supporting layer, a base membrane layer and a functional layer, the base membrane layer is arranged between the supporting layer and the functional layer, the supporting layer is polyester non-woven fabric, wherein the base membrane layer is polyaryletherketone containing phenolphthalein side group, and the functional layer is polyamide. The composite reverse osmosis membrane can keep high water flux and desalination rate at room temperature and after high-temperature treatment, and has good high-temperature resistance.

Description

technical field [0001] The invention relates to the technical field of water treatment membrane separation, in particular to a composite reverse osmosis membrane and a preparation method thereof. Background technique [0002] Reverse osmosis membrane is a semi-permeable membrane that uses pressure as the driving force to intercept solutes in the solution. It can effectively remove dissolved salts, colloids, microorganisms, etc. in water. It is widely used in seawater and brackish water desalination, industrial wastewater treatment and Ultrapure water preparation and other fields. [0003] At present, polyamide composite reverse osmosis membranes are the most used in the market. The preparation method generally includes two steps: first, scrape-coat a layer of polymer materials (such as polyarylsulfone, polyaryl ether sulfone, polytetrafluoroethylene) on the non-woven fabric. etc.) as a porous support layer; and then generate a polyamide desalination functional layer on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00
CPCB01D69/12B01D69/125B01D67/0011B01D67/0013B01D67/0006
Inventor 宋小飞钟林王镭安婷婷
Owner CHINA PETROLEUM & CHEM CORP
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