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Preparation method of composite membrane with hydrophobization function

A composite membrane and functional technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of poor membrane use effect, increased production cost, and large raw material restrictions, so as to achieve easy operation and economical The effect of cost and simple preparation process

Active Publication Date: 2014-01-29
无锡和烁丰新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional hydrophobic membranes have large raw material restrictions during the preparation process, which increases the production cost, the process is complicated, and the obtained membranes are not effective in use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for preparing a composite membrane with hydrophobic function is provided, comprising the steps of:

[0016] (1) Dissolve polytetrafluoroethylene in a mixed solution of dimethylformamide and ethanol and mechanically stir for 3 hours, and obtain a polytetrafluoroethylene mixed solution after standing;

[0017] (2) Scrape the polytetrafluoroethylene mixture on a glass plate for the first time. After the first scrape, immerse the glass plate in a gel bath to solidify to form a film. Take it out and let it stand. Place and then use the polytetrafluoroethylene mixture to scrape the film for the second time on the glass plate, then enter the gel bath to solidify and form a film, take it out and let it stand to obtain the base film layer, wherein the surrounding environment during the scraping process The temperature is 27°C, and the relative humidity is 56%. The gel bath includes an outer gel liquid and a core liquid, and the outer gel liquid is an aqueous solution co...

Embodiment 2

[0021] A method for preparing a composite membrane with hydrophobic function is provided, comprising the steps of:

[0022] (1) Dissolve polytetrafluoroethylene in a mixed solution of dimethylformamide and ethanol and mechanically stir for 2 hours, and obtain a polytetrafluoroethylene mixed solution after standing;

[0023] (2) Scrape the polytetrafluoroethylene mixture on a glass plate for the first time. After the first scrape, immerse the glass plate in a gel bath to solidify to form a film. Take it out and let it stand. Place and then use the polytetrafluoroethylene mixture to scrape the film for the second time on the glass plate, then enter the gel bath to solidify and form a film, take it out and let it stand to obtain the base film layer, wherein the surrounding environment during the scraping process The temperature is 29 ℃, and the relative humidity is 58%. The gel bath includes an outer gel liquid and a core liquid. The outer gel liquid is an aqueous solution contai...

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Abstract

The invention discloses a preparation method of a composite membrane with a hydrophobization function. The preparation method comprises the following steps: performing membrane scraping for multiple times on a glass plate by a mixed polytetrafluoroethylene liquid and curing for forming a membrane in a gelling bath to obtain a base membrane layer; dissolving poly-perfluoroalkyl ethyl acrylic ester granules in a mixed solution of monofluoride dichloroethane (HCFC-141b) and fluorosilane and stirring; adding epoxy resin and a phenolic aldehyde amine epoxy hardener to obtain a new mixed solution; mixing the new mixed solution with E type epoxy resin to obtain a mixture and applying the mixture onto the base membrane layer; and performing drying to obtain the composite membrane with the hydrophobization function. In the way, the preparation method of the composite membrane with the hydrophobization function has the advantages that the raw materials are extensive in source and easy to obtain, the preparation process is simple, and the preparation method is easy to operate without over-high requirements on the operation technique of operators and can effectively save cost; the obtained composite membrane with the hydrophobization function has certain hardness and strength and is excellent in hydrophobization performance.

Description

technical field [0001] The invention relates to the field of membrane technology, in particular to a method for preparing a composite membrane with hydrophobic function. Background technique [0002] Membrane is a material with selective separation function. The process of using the selective separation of membrane to realize the separation, purification and concentration of different components of feed liquid is called membrane separation technology. Membrane separation technology differs from traditional filtration methods in that membranes can separate in the molecular range. Membrane separation technology is a physical process that does not require phase changes and additives. Hydrophobic film is a kind of film, which generally refers to the film whose surface contact angle with water is greater than 150° and the rolling angle of water droplets is less than 10°. The traditional hydrophobic membrane has a large limitation on raw materials in the preparation process, whic...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/46B01D71/48B01D67/00
Inventor 白永平邵志敏丁丽萍
Owner 无锡和烁丰新材料有限公司
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