Preparation method of biodegradable oil and water separation porous film

An oil-water separation, porous membrane technology, applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problems of application limitation, low silica network strength, etc., and achieve the effect of economical and convenient preparation process

Active Publication Date: 2018-11-16
JIANGSU DAMAONIU NEW MATERIAL TECH CO LTD
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AI Technical Summary

Problems solved by technology

However, its application is greatly limited due to the low strength of the silica network

Method used

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  • Preparation method of biodegradable oil and water separation porous film
  • Preparation method of biodegradable oil and water separation porous film
  • Preparation method of biodegradable oil and water separation porous film

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Experimental program
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Embodiment 1-3

[0019] (1) SiO 2 Preparation of airgel / ethanol dispersion

[0020] 1ml tetraethyl orthosilicate was dissolved in 2ml methanol, and 0.5ml oxalic acid solution was slowly added to the mixture, and stirred for 30min. Then, 5 ml of methanol solution containing 0.6 ml of ammonia water (20%) was added, and the solution was further stirred for 15 min, and the solution was left at 25° C. for 1 h to form a gel. After gelation, add 20ml of absolute ethanol to the gel, and replace it at 25°C for 6h to remove oxalic acid and unreacted chemical substances, etc., then add 5ml of ethanol / n-hexane containing 5% trimethylchlorosilane Mix the solutions and repeat the ethanol wash treatment four times to ensure complete removal of oxalic acid and other chemical residues. After washing, SiO2 airgel is obtained by supercritical drying, and the obtained SiO2 airgel is added with an appropriate amount of absolute ethanol, and dispersed evenly by stirring and ultrasonic to make 0.1%, 0.5%, and 1% S...

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Abstract

The invention provides a preparation method of a biodegradable oil and water separation porous film. The preparation method comprises the following steps of using tetraethoxysilane and methanol solution as the raw materials, and adopting a sol-gel method to prepare a silicon dioxide gel; modifying in a hydrophobic way, and drying under the supercritical condition, so as to obtain a silicon dioxideaerogel; adding the silicon dioxide aerogel into an ethanol solution, so as to prepare a silicon dioxide aerogel/ethanol dispersing liquid for further use; preparing a polylactic acid thin film by anon-solvent induced phase separating method, dissolving the pretreated polylactic acid into a solvent, and stirring at constant temperature, so as to obtain a film casting liquid; pouring the film casting liquid onto the surface of a clean glass flat plate, scraping into a film by a scraping knife with certain thickness, soaking the preformed polylactic acid thin film into the ethanol dispersing liquid containing the silicon dioxide aerogel, curing, and drying, so as to obtain the silicon dioxide aerogel@polylactic acid thin film. The preparation method of the biodegradable oil and water separation porous film has the advantages that the preparation technology is simple, the oil and water separation property is excellent, the biodegradable effect is realized after use, and the applicationprospect is broad.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a low-cost, large-scale preparation method for superhydrophobic-superoleophilic polymer porous membranes. The porous membrane can be used to separate the oil-water emulsion with added surfactant. Background technique [0002] At present, most superhydrophobic films on the market (such as polyvinylidene fluoride films, polypropylene films, etc.) have the characteristics of high oil-water selectivity and excellent separation effect, but most of the superhydrophobic polymer films for It is a polymer material, which is difficult to degrade or takes a long time to degrade in the natural environment, and the reusability of the film is poor, and it is easy to cause secondary pollution after use, etc., and the disposal of waste polymer films is difficult, further increasing The cost of handling oil-water mixtures. Therefore, more and more researchers have begun to pay atten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/02B01D71/48B01D67/00B01D17/022
CPCB01D17/0202B01D67/0079B01D69/02B01D71/48B01D2325/38
Inventor 张振秀王聪戴欣茹
Owner JIANGSU DAMAONIU NEW MATERIAL TECH CO LTD
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