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Super hydrophobic/super lipophilic filter cloth and preparation method thereof and application thereof in oil-water separation

A super-lipophilic and super-hydrophobic technology, used in liquid separation, separation methods, chemical instruments and methods, etc., can solve the problems of cumbersome process, harsh reaction conditions, poor flexibility of copper mesh, etc., and achieve simple preparation process and reaction time. Effects of short, mild reaction conditions

Inactive Publication Date: 2014-12-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the shortcomings of the selected substrates, such as the lower physical and mechanical properties of filter paper and the poor flexibility of copper mesh, etc., their practical application is limited to some extent.
Chinese invention patent application CN101518695A discloses a method for preparing an oil-water separation net with super-hydrophobic and super-lipophilic functions by coating the surface of a fabric net with an organosilicon copolymer. Net is used as the base material, but the reaction process is carried out in two steps, and the intermediate product of the synthesis needs to be decolorized by activated carbon.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Super hydrophobic/super lipophilic filter cloth and preparation method thereof and application thereof in oil-water separation
  • Super hydrophobic/super lipophilic filter cloth and preparation method thereof and application thereof in oil-water separation
  • Super hydrophobic/super lipophilic filter cloth and preparation method thereof and application thereof in oil-water separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] At room temperature, after mixing 10g of toluene and 6g of ethanol in a beaker, add 0.5g of hydroxy silicone oil with a relative molecular mass of 1500 and a hydroxyl content of 6wt%, 0.05g of butyl titanate and 0.01g of dilaurel Acetate dibutyltin, and after magnetic stirring at room temperature for 0.5h, the organosilicon prepolymer was obtained. Add 4g of nano-silica toluene dispersion with a solid content of 35wt% and an average silica particle size of 20nm to the above-mentioned organosilicon prepolymer, and disperse with ultrasonic (400W, 20KHz) for 10min to obtain organosilicon-silica co-polymer mixture. Immerse the polypropylene fiber filter cloth (200 mesh) washed with ethanol aqueous solution and dried in the above silicone-silicon dioxide blend for 30s, then pull it slowly, and finally place the filter at 80°C for 30min to solidify. A superhydrophobic / superoleophilic filter cloth is obtained.

[0025] figure 1 It is the infrared spectrum of the hydroxyl si...

Embodiment 2

[0029] At room temperature, after mixing 10g of toluene and 2g of ethanol in a beaker, add 1.2g of hydroxy silicone oil with a relative molecular weight of 1500 and a hydroxyl content of 6wt%, 0.06g of isopropyl titanate and 0.006g of octanoic acid stannous, and magnetically stirred at room temperature for 0.5 h to obtain a silicone prepolymer. Add 4g of nano-silica toluene dispersion with a solid content of 25wt% and an average silica particle size of 50nm to the above-mentioned organosilicon prepolymer, and ultrasonically (400W, 20KHz) disperse for 10min to obtain organosilicon-silica co-polymer mixture. Immerse the polypropylene fiber filter cloth (100 mesh) washed and dried by ethanol aqueous solution into the above-mentioned silicone-silicon dioxide blend for 30s, then pull it slowly, and finally set the filter at 80°C for 30min to solidify. A superhydrophobic / superoleophilic filter cloth is obtained.

[0030] Infrared spectra of cured silicone polymers and figure 1 Si...

Embodiment 3

[0032]At room temperature, after mixing 10g of toluene and 10g of ethanol in a beaker, add 0.4g of hydroxyl silicone oil with a relative molecular mass of 3500 and a hydroxyl content of 11.2wt%, 0.08g of butyl titanate and 0.008g of di dibutyltin laurate and magnetically stirred at room temperature for 1 h to obtain a silicone prepolymer. Add 2.5g of nano-silica toluene dispersion with a solid content of 35wt% and an average silica particle size of 30nm to the above-mentioned organosilicon prepolymer, and disperse by ultrasonic (600W, 28KHz) for 10min to obtain organosilicon-silicon dioxide blends. Soak the polypropylene fiber filter cloth (200 mesh) washed with ethanol aqueous solution and dried in the above silicone-silicon dioxide blend for 60s, then pull it slowly, and finally arrange the filter at 100°C for 20min to cure. A superhydrophobic / superoleophilic filter cloth is obtained.

[0033] Infrared spectra of cured silicone polymers and figure 1 Similar; SEM photos an...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention discloses a super hydrophobic / super lipophilic filter cloth and a preparation method thereof and application thereof in oil-water separation. At room temperature, hydroxyl silicone oil, an organic tin catalyst and a titanate curing agent are dissolved in a toluene-ethanol mixed solvent to obtain organic silicon prepolymer; then a nano-silica toluene dispersion liquid is added into the prepolymer, after uniform mixing and dispersing, organosilicon / silica blend is obtained; and a 100-400 mesh polymer fiber filter cloth is put in the blend, and a super hydrophobic / super lipophilic cloth is prepared through a dip-coating-pulling manner. Compared with preparation technology of hydrophobic / super lipophilic materials in the prior art, the preparation method has the advantages of simple process and mild reaction conditions, the materials used are cheap and easily available, the prepared filter cloth has super hydrophobic and super lipophilic properties, can fast and effectively separate an oil-water mixture, and can be applied to the fields of sea crude oil leakage processing, industrial oil and water separation treatment and the like.

Description

technical field [0001] The invention relates to the field of superhydrophobic coatings, in particular to a superhydrophobic / superoleophilic filter cloth, a preparation method thereof and an application in oil-water separation. Background technique [0002] It is generally believed that when the contact angle between water droplets and the surface of the object is greater than 150°, and the rolling angle is lower than 10°, it means that the surface of the object has superhydrophobicity. When water droplets touch the super-hydrophobic surface, the water droplets cannot wet the surface and roll away in the form of small balls. At the same time, the rolling water droplets can take away hydrophilic substances such as soil and ash layer on the surface, endowing the super-hydrophobic surface with "self-cleaning" Features. [0003] Due to the special surface wetting properties of the super-hydrophobic coating, Jiang et al. -2014) Coated a fluoropolymer coating with superhydrophobi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D17/022
Inventor 曾幸荣李坤泉李红强赖学军
Owner SOUTH CHINA UNIV OF TECH
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