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Preparation method of linear polydimethylsilane (PDMS) modified oil-water separation film, and oil-water separation film prepared through preparation method

A polydimethylsilane and oil-water separation membrane technology, which is applied in the field of oil-water separation material preparation, can solve the problems of low antifouling performance and high viscosity oil-water separation flux, etc., so as to improve antifouling performance, reduce pollution, and improve separation The effect of flux

Active Publication Date: 2019-05-28
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to overcome the defects and deficiencies of existing oil-water separation membranes, such as low flux for high-viscosity oil-water separation and low antifouling performance, and provide a preparation method for linear polydimethylsilane-modified oil-water separation membranes. A polydimethylsilane-modified oil-water separation membrane was prepared by hydroxylation pretreatment on the surface of the porous substrate and grafting a flexible polymer brush liquid layer on the membrane surface

Method used

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  • Preparation method of linear polydimethylsilane (PDMS) modified oil-water separation film, and oil-water separation film prepared through preparation method
  • Preparation method of linear polydimethylsilane (PDMS) modified oil-water separation film, and oil-water separation film prepared through preparation method
  • Preparation method of linear polydimethylsilane (PDMS) modified oil-water separation film, and oil-water separation film prepared through preparation method

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Effect test

Embodiment 1

[0045] A preparation method of a linear polydimethylsilane modified oil-water separation membrane, comprising the steps of:

[0046] S1. Cleaning of the stainless steel mesh base: put the stainless steel mesh base into acetone, isopropanol and deionized water solvents in sequence, and ultrasonically clean them for 30 minutes to remove organic impurities on the surface, and then place them in a vacuum drying oven at 60°C for drying ;

[0047] S2. Surface plasma treatment: Put the clean stainless steel mesh into the plasma treatment machine, set the intensity to 50W, and set the time to 20min to fully hydroxylate the surface;

[0048] S3. Grafting of the flexible polymer brush liquid layer on the surface of the membrane: immerse the hydroxylated stainless steel mesh into the methyl-terminated PDMS liquid with a molecular weight of 6000 (Mw), place it in a blast drying oven, and set the temperature The temperature is 100℃, and the time is set to 24h;

[0049] S4. Take the stain...

Embodiment 2

[0056] A preparation method of a linear polydimethylsilane modified oil-water separation membrane, comprising the steps of:

[0057] S1. Cleaning of the stainless steel mesh substrate: put the stainless steel mesh substrate into acetone, isopropanol and deionized water solvents in sequence, and ultrasonically clean them for 30 minutes respectively to remove organic impurities on the surface, and place them in a vacuum drying oven at 60°C for drying;

[0058] S2. Surface plasma treatment: Put the clean stainless steel mesh into the plasma treatment machine, set the intensity to 50W, and set the time to 15min to fully hydroxylate the surface;

[0059] S3. Grafting of the flexible polymer brush liquid layer on the surface of the membrane: immerse the hydroxylated stainless steel mesh into the methyl-terminated PDMS liquid with a molecular weight of 9000 (Mw), place it in a blast drying oven, and set the temperature The temperature is 100°C, and the time is set to 24h. The linear...

Embodiment 3

[0062] A preparation method of a linear polydimethylsilane modified oil-water separation membrane, comprising the steps of:

[0063] S1. Cleaning of the stainless steel mesh substrate: put the stainless steel mesh substrate into acetone, isopropanol and deionized water solvents in sequence, and ultrasonically clean them for 30 minutes respectively to remove organic impurities on the surface, and place them in a vacuum drying oven at 60°C for drying;

[0064] S2. Surface plasma treatment: Put the clean stainless steel mesh into the plasma treatment machine, set the intensity to 30W, and set the time to 20min to fully hydroxylate the surface;

[0065] S3. Grafting of the flexible polymer brush liquid layer on the surface of the membrane: immerse the hydroxylated stainless steel mesh into the hydroxyl-terminated PDMS liquid with a molecular weight of 6000 (Mw), place it in a blast drying oven, and set the temperature to 100°C, the time is set to 24h. The linear PDMS molecular fo...

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Abstract

The invention discloses a preparation method of a linear polydimethylsilane (PDMS) modified oil-water separation film, and the oil-water separation film prepared through the preparation method. The preparation method comprises the following steps: a porous substrate is cleaned, surface organic impurities are removed, surface hydroxylation treatment is conducted, the porous substrate is immersed inlinear PDMS liquid to be subjected to a surface flexible polymer brush-type liquid layer grafting reaction, cleaning is conducted to remove excess PDMS, and drying is conducted to obtain the PDMS modified oil-water separation film. According to the preparation method, raw materials are non-toxic and environmentally friendly, the preparation process is simple, relying on expensive equipment is notneeded, and the overall low cost; through simple flexible chain single molecular layer decoration, the appearance shape of a base material is not affected; and the prepared oil-water separation material has the good anti-fouling property, can reduce adhesion of organic matter and oil on the surface, and can effectively separate a crude oil-water mixture with the high viscosity, and the separationspeed of the oil-water separation material is twice or above that of the same material modified by the cross-linking PDMS and an ordinary alkane molecular brush.

Description

technical field [0001] The invention relates to the technical field of preparation of oil-water separation materials, and more specifically, relates to a method for preparing a linear polydimethylsilane-modified oil-water separation membrane and the prepared oil-water separation membrane. Background technique [0002] Oily waste water, watery waste oil, and offshore oil spills discharged from industrial production and domestic use not only cause waste of resources, but also cause damage to environmental ecology and human health. With the discovery and derivation of the superhydrophobic phenomenon, superwetting porous materials with superhydrophobicity / superoleophilicity and superhydrophilic / underwater superoleophobicity show great application prospects in the field of oil / water separation. However, current separation materials encounter two common problems in practical applications, namely, membrane fouling and low flux, especially for surfactant-containing emulsions and hig...

Claims

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Application Information

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IPC IPC(8): B01D71/78B01D69/12B01D67/00B01D17/02
Inventor 田雪林陈立伟冯秋霞
Owner SUN YAT SEN UNIV
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