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A wear-resistant superhydrophobic superoleophilic polyurethane sponge, its preparation method and its application in the continuous separation of oil and water

A polyurethane sponge, super lipophilic technology, applied in separation methods, liquid separation, chemical instruments and methods, etc., can solve the problems of poor surface durability, inability to continuously separate, high cost, and achieve reduced surface energy, small specific gravity, and strong acid resistance. The effect of strong alkali corrosion

Active Publication Date: 2019-03-05
HENAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the shortcomings and deficiencies of the prior art, the purpose of the present invention is to provide a wear-resistant superhydrophobic superoleophilic polyurethane sponge, which can be used to rapidly and continuously separate oil-water mixtures, and solve the problem of using bionic superhydrophobic / superoleophilic surfaces. Poor surface durability during oil-water separation, needs to be modified with fluorine-containing low surface energy substances, high cost, cannot be continuously separated, etc.

Method used

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  • A wear-resistant superhydrophobic superoleophilic polyurethane sponge, its preparation method and its application in the continuous separation of oil and water
  • A wear-resistant superhydrophobic superoleophilic polyurethane sponge, its preparation method and its application in the continuous separation of oil and water
  • A wear-resistant superhydrophobic superoleophilic polyurethane sponge, its preparation method and its application in the continuous separation of oil and water

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A preparation method of wear-resistant superhydrophobic superoleophilic polyurethane sponge, comprising the steps of:

[0030] 1) The polyurethane sponge was ultrasonically cleaned with distilled water and absolute ethanol for 30 minutes, and dried naturally at room temperature;

[0031] 2) Evenly disperse hydrophobic DNS-2 nano-silica and polydimethylsiloxane in n-hexane with magnetic stirring, wherein the mass fraction of nano-silica is 0.1%, and the mass fraction of polydimethylsiloxane 0.01%;

[0032] 3) Soak the cleaned polyurethane sponge in the above solution for 1 hour, put the soaked polyurethane sponge in an oven and dry at 100°C for 0.5 hour to obtain the product.

[0033] Adopt OCAH200 contact angle tester to test the wettability of gained polyurethane sponge, the result shows: the contact angle of polyurethane sponge and water is 152 °, shows superhydrophobic property; The contact angle with normal hexane, paraffin oil is 0 ° (see figure 2 ), exhibiting ...

Embodiment 2

[0040] A preparation method of wear-resistant superhydrophobic superoleophilic polyurethane sponge, comprising the steps of:

[0041] 1) The polyurethane sponge was ultrasonically cleaned with distilled water and absolute ethanol for 30 min, and dried naturally at room temperature;

[0042] 2) Evenly disperse hydrophobic DNS-2 nano-silica and polydimethylsiloxane in n-hexane with magnetic stirring, wherein the mass fraction of nano-silica is 0.3%, and the mass fraction of polydimethylsiloxane 0.03%;

[0043] 3) Soak the cleaned polyurethane sponge in the above solution for 1.5 hours, and dry the soaked polyurethane sponge in an oven at 100°C for 0.5 hours to obtain the product.

[0044] Insert one end of the catheter into the polyurethane sponge obtained in step 3), and connect the other end to a vacuum pump. Dye paraffin oil red with oil red, mix it with water 1:2, put the obtained polyurethane sponge into the oil-water mixture, turn on the vacuum pump, the red paraffin oil...

Embodiment 3

[0047] A preparation method of wear-resistant superhydrophobic superoleophilic polyurethane sponge, comprising the steps of:

[0048] 1) The polyurethane sponge was ultrasonically cleaned with distilled water and absolute ethanol for 30 min, and dried naturally at room temperature;

[0049] 2) Evenly disperse hydrophobic DNS-3 nano-silica and polydimethylsiloxane in absolute ethanol with magnetic stirring, wherein the mass fraction of nano-silica is 0.3%, vinyl polydimethylsiloxane Ratio 0.03%;

[0050] 3) Soak the cleaned polyurethane sponge in the above solution for 1.5h. The soaked polyurethane sponge is dried in an oven at 100°C for 1h.

[0051] Insert one end of the catheter into the polyurethane sponge obtained in step 3), and connect the other end to a vacuum pump. Dye paraffin oil red with oil red, mix it with water 1:2, put the obtained polyurethane sponge into the oil-water mixture, turn on the vacuum pump, the red paraffin oil is quickly sucked, and the water is b...

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Abstract

The present invention belongs to the technical field of functional materials, and in particular relates to a preparation method of a wear-resistant super-hydrophobic super-lipophilic polyurethane sponge, and the method comprises the following steps: 1) hydrophobic nano-silica and polydimethylsiloxane are uniformly dispersed in n-hexane or anhydrous ethanol to obtain a system A; 2) a cleaned polyurethane sponge is put into the system A obtained in the step 1) for soaking for 1-2h, then taken out, and put into a drying oven for drying to obtain the wear-resistant super-hydrophobic super-lipophilic polyurethane sponge. The preparation method is simple, through nano-silica / polydimethylsiloxane modifying, the surface energy of the polyurethane sponge can be reduced, the surface and bulk phase of the polyurethane sponge both can reach super-hydrophobic super-lipophilic functions. Surface contact angles of organic solvents such as paraffin oil, petrol, diesel oil, n-hexane, acetone and the like on the surface of the polyurethane sponge is 0 degree, and a surface contact angle of water on the polyurethane sponge is greater than 150 degree. The prepared polyurethane sponge has excellent wear resistance, is non-fluorinated and environmentally friendly, and can be used for continuous separation of an oil and water mixture.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a wear-resistant superhydrophobic and superoleophilic polyurethane sponge, a preparation method and its application in continuous oil-water separation. Background technique [0002] With the rapid development of the petroleum industry, the occurrence of oil spill accidents is also increasing, seriously endangering the natural environment and human existence. In order to recover oil as a scarce resource as much as possible while reducing environmental pollution, researchers are trying to find a good way to separate oil and water. Currently, the use of biomimetic superhydrophobic / superoleophilic surfaces for oil-water separation is an effective method. Chinese patent CN100344341C discloses a superhydrophobic and superoleophilic oil-water separation network, which uses perfluoroalkylsiloxane to form a superhydrophobic superoleophilic perfluoroalkylsiloxane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/42B01D17/022C08L75/04
CPCB01D17/02C08J9/42C08J2375/04
Inventor 张霞朱文忠丁蓓张平余
Owner HENAN UNIVERSITY
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