Super-hydrophilic polymer microporous membrane, and preparation method and application thereof

A polymer and super-hydrophilic technology, which is applied in the field of polymer microporous membranes and superhydrophilic polymer microporous membranes, can solve the problems of limited wide application and strong toxicity of polyethyleneimine, and achieves simple process and low price. , The effect of high oil-water separation efficiency

Inactive Publication Date: 2019-09-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the employed polyethyleneimine is highly toxic,

Method used

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  • Super-hydrophilic polymer microporous membrane, and preparation method and application thereof
  • Super-hydrophilic polymer microporous membrane, and preparation method and application thereof
  • Super-hydrophilic polymer microporous membrane, and preparation method and application thereof

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preparation example Construction

[0020] A method for preparing a super-hydrophilic polymer microporous membrane provided by an aspect of the embodiments of the present invention includes: immersing the pretreated polymer microfiltration membrane in the immersion liquid for 4 to 6 minutes, and then pouring into the immersion liquid Dissolve dopamine hydrochloride and tannic acid in the water, and shake at 25-45°C for 4-24 hours, then take the polymer microfiltration membrane out of the immersion solution, wash and dry it, and obtain super-hydrophilic polymer microporous membrane.

[0021] In some embodiments, the pretreatment includes: soaking the polymer microfiltration membrane in absolute ethanol.

[0022] In some embodiments, the polymer microfiltration membrane includes polypropylene microfiltration membrane, polyvinylidene fluoride microfiltration membrane, polytetrafluoroethylene membrane, polysulfone microfiltration membrane, nylon microfiltration membrane, cellulose acetate microfiltration membrane A...

Embodiment 1

[0040] Embodiment 1 A kind of preparation method of superhydrophilic polypropylene microporous membrane comprises the following steps:

[0041] (1) Soak the polypropylene microfiltration membrane with a pore size of 0.2 microns in absolute ethanol, then place it in 100 mL of Tris-HCl soaking solution for 5 minutes, and the pH of the Tris-HCl solution is 8.5;

[0042] (2) Dissolving 0.1 g of dopamine hydrochloride and 0.1 g of tannic acid in the impregnation solution containing the polymer microfiltration membrane, and shaking at 45° C. for 8 hours;

[0043] (3) The polypropylene microfiltration membrane is taken out from the soaking solution, washed with clear water and dried in the air to obtain a superhydrophilic polymer microporous membrane.

[0044] The water contact angle of the modified polypropylene film obtained in this embodiment becomes 0° in 1 second (see figure 1 ), it was placed under water to measure the contact angle of this film with 1 microliter of methylene ...

Embodiment 2

[0047] Embodiment 2 A kind of preparation method of superhydrophilic polyvinylidene fluoride microporous membrane comprises the following steps:

[0048] (1) Soak a polyvinylidene fluoride microfiltration membrane with a pore size of 0.2 microns in absolute ethanol, and then soak it in 100 mL of Tris-HCl soaking solution for 5 minutes, and the pH of the Tris-HCl solution is 9.5;

[0049] (2) Dissolving 0.05g of dopamine hydrochloride and 0.15g of tannic acid in the impregnation solution containing the polymer microfiltration membrane, and shaking at 40°C for 4 hours;

[0050](3) Take out the polyvinylidene fluoride microfiltration membrane from the immersion solution, wash it with clear water and dry it in the air to obtain a superhydrophilic polymer microporous membrane.

[0051] The water contact angle of the modified polyvinylidene fluoride film obtained in this embodiment becomes 0° in 1 second, and it is placed under water to measure the contact angle of the film with 2 m...

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Abstract

The invention discloses a super-hydrophilic polymer microporous membrane, and a preparation method and application thereof. The preparation method comprises the following steps: impregnating a pretreated polymer microfiltration membrane in impregnation liquid, then dissolving dopamine hydrochloride and tannic acid in the impregnation liquid, oscillating at a suitable temperature, then taking the polymer microfiltration membrane out from the impregnation liquid, and washing and drying to obtain the super-hydrophilic polymer microporous membrane. The super-hydrophilic polymer microporous membrane provided by the invention has super hydrophilicity and underwater super oleophobic property, and is good in stability; the oil-water separation efficiency is high; an oil-water emulsion can be effectively separated; meanwhile, the preparation process is simple, raw materials adopted can be derived from biomass, safe and environment-friendly effects are achieved, the price is low, large-scale preparation can be realized, and a very good industrial application prospect is realized.

Description

technical field [0001] The invention relates to a polymer microporous membrane, in particular to a superhydrophilic polymer microporous membrane, its preparation method and its application in oil-water separation, belonging to the field of functional materials. Background technique [0002] With the rapid development of industry and the acceleration of urbanization, wastewater containing a large amount of pollutants is discharged into the environment, which will damage the ecological environment and threaten human health. Among these contaminants, emulsified oils are particularly difficult to deal with. Traditional gravity separation, ultrasonic separation, air flotation, centrifugation, coagulation, biological treatment and other methods are limited due to low separation efficiency and large secondary pollution. It is urgent to develop an efficient, energy-saving and economical emulsified oil separation method. [0003] Membrane separation technology has been used to separ...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D71/26B01D69/02B01D67/00B01D17/022
CPCB01D17/0202B01D67/0002B01D69/02B01D71/26B01D71/34
Inventor 顾林曾志翔房上
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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