Preparation method of superhydrophobic/superoleophilic sponge

A super-oleophilic and super-hydrophobic technology, which is applied in the field of preparation of super-hydrophobic and super-oleophilic sponges, can solve problems such as cumbersome methods, and achieve the effects of easy-to-obtain raw materials, simple preparation methods, and good self-cleaning properties

Active Publication Date: 2012-09-12
BEIHANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Recently, the research on oil-water separation materials has beco

Method used

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  • Preparation method of superhydrophobic/superoleophilic sponge
  • Preparation method of superhydrophobic/superoleophilic sponge
  • Preparation method of superhydrophobic/superoleophilic sponge

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preparation example Construction

[0027] A kind of superhydrophobic superoleophilic polyurethane sponge preparation method that the present invention proposes, such as figure 1 As shown, the method includes the following steps:

[0028] (1) Sponge pretreatment: take a beaker, pour deionized water into it for later use, immerse the polyurethane sponge in the deionized water, (the contact angle of the sponge to water is 0°, and its appearance is as follows figure 2 , image 3 As shown, the polyurethane sponge without any treatment has no micro-nano structure, and the size of the polyurethane sponge is preferably 50mm×100mm×10mm), put the beaker into the ultrasonic device for 30-90 minutes to clean the stain on the surface of the sponge; Pour out the cleaning solution, pour absolute ethanol (analytical alcohol, ethanol mass fraction ≥ 99.7%) into the beaker, continue to ultrasonically clean the polyurethane sponge for 30-90 minutes, remove the grease on the polyurethane sponge, and then dry (oven temperature 60...

Embodiment 1

[0036] A kind of superhydrophobic superoleophilic polyurethane sponge preparation method that present embodiment proposes, this method comprises the following steps:

[0037] (1) Sponge pretreatment: Take a beaker, pour deionized water into it for later use, immerse the polyurethane sponge (50mm×100mm×10mm in size) in deionized water, put the beaker into the ultrasonic device for 30 minutes to clean the surface of the sponge Stains: Pour out the cleaning solution, pour absolute ethanol (analytical alcohol, ethanol mass fraction ≥ 99.7%) into the beaker, continue to ultrasonically clean the polyurethane sponge for 30 minutes, remove the grease on the sample, and then dry it (oven temperature 60 ℃) for use;

[0038] (2) Preparation of chromic acid lotion: Measure 20ml of deionized water, pour it into a 500ml beaker for later use, weigh 10g of potassium dichromate, pour it into a beaker filled with 20ml of deionized water, and then measure 180ml Concentrated sulfuric acid (98wt%...

Embodiment 2

[0045] A kind of superhydrophobic superoleophilic polyurethane sponge preparation method that present embodiment proposes, this method comprises the following steps:

[0046] (1) Sponge pretreatment: take a beaker, pour deionized water into it for later use, immerse the polyurethane sponge (70mm×80mm×15mm) in deionized water, put the beaker into the ultrasonic device for 40 minutes to clean the stain on the surface of the sponge; Pour out the cleaning solution, pour absolute ethanol (analytical alcohol, ethanol mass fraction ≥ 99.7%) into the beaker, continue to ultrasonically clean the polyurethane sponge for 40 minutes, remove the grease on the sample, and then dry (oven temperature 70°C) stand-by;

[0047] (2) Preparation of chromic acid lotion: Measure 40ml of deionized water, pour it into a 500ml beaker for later use, weigh 8g of potassium dichromate, pour it into a beaker filled with 40ml of deionized water, and then measure 150ml Concentrated sulfuric acid (97wt%) is s...

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Abstract

The invention discloses a preparation method of a superhydrophobic/superoleophilic sponge, belonging to the technical field of functional materials. The method comprises the following steps: pretreating the sponge, preparing a chromic acid washing liquid, preparing a polyperfluoroalkylsiloxane-ethanol mixed solution, corroding by immersing the sponge in the chromic acid washing liquid, modifying by immersing the sponge in the polyperfluoroalkylsiloxane-ethanol mixed solution, taking out, drying and the like. The preparation method disclosed by the invention has the advantage of simple process; and by using the chromic acid corrosion and fluorosilane modification, a superhydrophobic/superoleophilic surface is formed on the surface of the polyurethane sponge. By the means of chemical reaction, the polyurethane sponge is firstly corroded by the chromic acid washing liquid and then modified by the polyperfluoroalkylsiloxane-ethanol solution to lower the surface energy, so that the sponge is superhydrophobic and superoleophilic, thereby enhancing the oil-water separation effect. The surface contact angle of gasoline is 0 degree, and the surface contact angle of water is greater than 150 degrees.

Description

technical field [0001] The invention belongs to the technical field of functional materials, and in particular relates to a preparation method of a superhydrophobic and superoleophilic sponge, which solves the existing technical problems of low efficiency and high cost of adsorbing organic matter by substances for oil-water separation. Background technique [0002] Moisture and impurities in the oil are the key factors affecting the quality of the oil. It is an important subject in the separation process to seek economical and practical and continuous removal of water in the oil. There are two main factors affecting the wettability of solid surfaces: one is the surface chemical composition (surface free energy), and the other is the surface microstructure (roughness). With the in-depth study of special wetting surfaces in nature, the preparation methods of special wetting surfaces are emerging. Biomimetic superhydrophobic surfaces can be realized by two methods: one is to m...

Claims

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Application Information

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IPC IPC(8): C08J9/36C08J7/12C08J7/14C08L75/04B01D17/022
Inventor 刘克松张玺瑶李舟江雷
Owner BEIHANG UNIV
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