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Water-based superhydrophobic coating and preparation method thereof

A super-hydrophobic coating, water-based technology, applied in coatings and other directions, can solve the problems of large amount of organic solvents, dependence, complex process, etc., to achieve the effect of optimizing coating performance, increasing coating thickness, and simple preparation conditions

Active Publication Date: 2018-11-27
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above methods have problems such as complex process, large amount of organic solvent, or dependence on emulsifiers and other additives. Therefore, it is of great significance to develop a superhydrophobic coating with simple process and environmental friendliness.

Method used

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  • Water-based superhydrophobic coating and preparation method thereof
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  • Water-based superhydrophobic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Take the hydrophobic silicone resin prepolymer (Sylgard 184A, Dow Corning) and its curing agent (Sylgard184B, Dow Corning) and dissolve it in tetrahydrofuran, a good solvent, add fumed silica (particle size 7nm-13nm) after completely dissolving, Use a high-speed disperser to disperse at a speed of 5000r / min for 5 minutes to obtain a uniformly dispersed suspension. The resulting suspension was placed in a container, which was immersed in an ultrasonic water bath. Set the ultrasonic frequency to 25KHz, add distilled water drop by drop in a water bath at 30°C, and finish dropping within 30 minutes to obtain a uniformly dispersed emulsion. Wherein, the raw materials of the super-hydrophobic water-based coatings account for the total raw material mass percentages: 1% hydrophobic silicone resin, 0.3% curing agent, 30% tetrahydrofuran, 0.2% fumed silica, and the balance of water.

[0040] Immerse the cleaned nylon fabric in the dispersed emulsion, soak it at a system temperat...

Embodiment 2

[0042] Take the hydrophobic silicone resin prepolymer (Sylgard 184A, Dow Corning) and its curing agent (Sylgard184B, Dow Corning) and dissolve it in tetrahydrofuran, a good solvent, and add fluorine-modified nano-silica (particle size 20nm- 30nm), using a high-speed disperser to disperse at a speed of 7000r / min for 5min to obtain a uniformly dispersed suspension. The resulting suspension was placed in a container, which was immersed in an ultrasonic water bath. Set the ultrasonic frequency to 25KHz, add distilled water drop by drop in a water bath at 30°C, and finish dropping within 50 minutes to obtain a uniformly dispersed emulsion. Wherein, the raw materials of the super-hydrophobic water-based coatings account for the total raw material mass percentages: 6% hydrophobic silicone resin, 0.5% curing agent, 50% tetrahydrofuran, 6% fluorine-modified silicon dioxide, and the balance of water.

[0043] Immerse the cleaned nylon fabric in the dispersed emulsion, soak it at a syst...

Embodiment 3

[0045] Get hydrophobic fluorocarbon resin polyvinylidene fluoride (molecular weight 100000) and polymethyl methacrylate (molecular weight 30000) and dissolve in its good solvent tetrahydrofuran, add alkyl modified nano-silica (particle size 50nm -70nm), using a high-speed disperser to disperse for 10min at a speed of 4000r / min to obtain a uniformly dispersed suspension. The resulting suspension was placed in a container, which was immersed in an ultrasonic water bath. Set the ultrasonic frequency to 30KHz, add distilled water drop by drop in a water bath at 30°C, and finish dropping within 60 minutes to obtain a uniformly dispersed emulsion. Among them, the raw materials of super-hydrophobic water-based coatings account for the total raw material mass percentages: 10% hydrophobic fluorocarbon resin, 0.8% polymethyl methacrylate adhesive resin, 60% tetrahydrofuran, alkyl modified dioxide Silicon 3%, the balance water.

[0046] Select an area of ​​the exterior wall of the buil...

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Abstract

The invention provides a water-based superhydrophobic coating and a preparation method thereof. The coating is prepared from the following raw materials in percentage by mass: 1-20 percent of hydrophobic resin, 10-90 percent of good solvent of hydrophobic resin, 0.01-1 percent of an additive, 0.1-10 percent of nano-particles and the balance of water, wherein the additive is a curing agent or adhesive resin; the hydrophobic resin is one or more of organic silicon resin, fluorocarbon resin, fluorinated modified epoxy resin and fluorinated modified polyurethane; and the nano-particles are one ormore of fumed silica, nano-titanium dioxide, nano-alumina, fluorine-modified nano-silicon dioxide and alkyl modified nano-silicon dioxide. The water-based superhydrophobic coating is easily availablein raw materials and simple in preparation condition, and can be used for treating various substrates by a simple dip-coating or spraying process so as to obtain a superhydrophobic surface by curing.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of functional coatings, and in particular relates to a water-based superhydrophobic coating and a preparation method thereof. Background technique [0002] The superhydrophobic state is defined as the superwetting state in which the static contact angle of water droplets on the hydrophobic surface is greater than 150° and the rolling angle is less than 10°. The surface of lotus leaves, legs of water striders, butterfly wings, rose petals, etc. in nature have excellent superhydrophobicity due to their unique micro / nano graded rough structure and chemical composition on the surface, so they have the ability to survive under certain environmental conditions. Advantage. Based on the bionic theory, the research on the preparation of superhydrophobic surfaces has become a hot spot recently. The unique super-wetting characteristics of super-hydrophobic surface make super-hydrophobic materia...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D127/16C09D151/08C09D7/61C09D7/62C09D7/20C09D4/02C09D4/06
CPCC08K2003/2227C08K2003/2241C08K2201/011C09D4/06C09D7/20C09D7/61C09D7/62C09D127/16C09D151/08C09D183/04C08K3/36C08K9/02C08L33/12C08K9/04C08K3/22
Inventor 张旭刘景新王小梅
Owner HEBEI UNIV OF TECH
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