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Novel hydrophobic membrane and preparation method thereof

A hydrophobic film and a new technology, applied in the field of new hydrophobic film and its preparation, can solve the problems of insufficient hydrophobicity, insufficient use efficiency, and insufficient strength of the hydrophobic membrane, and achieve guaranteed strength, high contact angle, and high crystallinity. Effect

Inactive Publication Date: 2015-11-11
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently, PVDF-based hydrophobic membranes have insufficient hydrophobicity, insufficient strength, and insufficient performance.

Method used

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  • Novel hydrophobic membrane and preparation method thereof
  • Novel hydrophobic membrane and preparation method thereof
  • Novel hydrophobic membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] First place the PVDF-CTFE copolymer powder in an oven at a constant temperature of 60°C for 24 hours to dry and dehumidify; then dry and dehumidify the PVDF-CTFE and the organic solvent DMAc at a mass percentage of 12:88 at a constant temperature of 30°C Stir at a speed of 200 rpm for 24 hours; then stand at a constant temperature of 30°C for 24 hours for degassing to obtain the casting solution; then scrape the casting solution on the glass with non-woven fabric with a self-made scraper in the laboratory. Nascent membrane: Finally, the nascent membrane was left in the air for 10 seconds, then soaked in a tap water gel bath at 30°C for 24 hours, then taken out and dried in the air to obtain a new hydrophobic membrane.

[0045] The measured contact angle of the membrane reaches 95.0 degrees, and the average pore diameter is 0.085 microns. With 3.5% NaCl solution as the stock solution, the temperature and flow of the hot and cold sides are 56 degrees Celsius and 65 liters / ...

Embodiment 2

[0048] First place the PVDF-CTFE copolymer powder in an oven at a constant temperature of 40°C for 36 hours to dry and dehumidify; then mix polyethylene glycol PEG and dimethylacetamide DMAc in a mass percentage of 5:83, and then Add 12 parts by weight of the above-mentioned dry and dehumidified PVDF-CTFE copolymer to the mixture, stir at a constant temperature of 25°C at a speed of 1400 rpm for 36 hours; then stand at a constant temperature of 25°C for 24 hours to obtain a cast Membrane liquid; then scrape the casting liquid on the glass with non-woven fabric to form a nascent film using a flat scraping machine, and finally leave the nascent film in the air for 10 seconds and then soak it in a tap water gel bath at 25°C for 24 hours Then take it out and dry it in the air to get a new type of hydrophobic film.

[0049] The measured contact angle of the membrane reaches 93.7 degrees, and the average pore diameter is 0.1066 microns. With 3.5% NaCl solution as the stock solution,...

Embodiment 3

[0052] First place the PVDF-CTFE copolymer powder in an oven at a constant temperature of 40°C for 36 hours to dry and dehumidify; then mix the inorganic lithium chloride LiCl and dimethylformamide DMF uniformly at a mass percentage of 5:70, and then in Add 25 parts by weight of the above-mentioned PVDF-CTFE copolymer after drying and dehumidification to the mixture, and stir at a constant temperature of 25°C at a speed of 1400 rpm for 36 hours; then stand for defoaming at a constant temperature of 25°C for 18 hours to obtain Casting solution: Scrape the casting solution on the glass with non-woven fabric to form a primary film by using a flat-plate scraping machine, and finally leave the primary film in the air for 10 seconds and soak it in a 25°C tap water gel bath for 24 After one hour, take it out and dry it in the air to obtain a new type of hydrophobic film.

[0053] The film has a contact angle of 93.8 degrees and an average pore diameter of 0.068 microns. With 3.5% NaC...

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Abstract

The invention relates to a novel hydrophobic membrane and a preparation method thereof. The method comprises the following steps: dissolving 0-15wt% of a pore-forming agent and 70-80wt% of an organic solvent, uniformly mixing to obtain a mixture I, adding 8-25wt% of PVDF-CTFE copolymer powder after being subjected to drying dehumidification into the mixture I to obtain a mixture II, and stirring the mixture II for 24h or more at the constant temperature of 25-70 DEG C at the speed of 50-1400rpm until the mixture II is uniformly mixed; standing for defoaming for 12h or more at the temperature of 25-70 DEG C to form uniform film casting liquid; scraping the film casting liquid by a film scraping device to obtain a primary film; and soaking the primary film for 24h in a sol-gel bath formed by tap water, and airing in an air environment to obtain the novel hydrophobic membrane. Compared with the prior art, the novel hydrophobic membrane has a more obvious crystalline structure, a better hydrophobic performance, the narrower pore diameter distribution, and a more communicated pore structure, and can show the higher permeant flux and produced water quality in the membrane distillation application; the method has the wide application prospect in hydrophobic membrane preparation and application fields.

Description

【Technical field】 [0001] The invention belongs to the technical field of hydrophobic membrane preparation, and in particular relates to a novel hydrophobic membrane prepared by using a polymer copolymer material and a preparation method thereof. 【Background technique】 [0002] Membrane separation technology has developed rapidly in recent decades, resulting in a large number of new membrane processes. With the emergence and development of new membrane processes based on hydrophobic membranes such as membrane distillation, membrane extraction, and pervaporation, higher requirements are put forward for the hydrophobic performance and strength of separation membranes. The preparation and application of enhanced hydrophobic membranes have also become the field of membrane separation. one of the research hotspots. At present, the preparation of enhanced hydrophobic membranes mainly starts with the search for new membrane materials, membrane modification, membrane structure contr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D71/32B01D69/02B01D69/06B01D69/08B01D67/00
Inventor 王军郑利兵张勇候得印钱盘生
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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