Method of preparing super-hydrophobic coating by compounding waterborne polyurethane and hydrophobic modified inorganic nanoparticles

A technology of inorganic nanoparticles and water-based polyurethane, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of difficult control of micro/nano structure and surface, poor uniformity and reproducibility, and unfavorable large-area film formation. Achieve the effects of easy large-area preparation, low production cost, and environmentally friendly process

Active Publication Date: 2019-02-22
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method of the invention is simple, non-toxic and non-polluting, realizes the combination of organic and inorganic phases to form a graded micro / nano structure, can be produced on a large scale, and solves the problem that the existing technology is not conducive to large-area film formation, difficulties in construction technology, and super-hydrophobic surface and The micro / nano structure and surface energy of the coating are not easy to control, the uniformity and reproducibility are poor, and the mechanical wear resistance is poor, etc.

Method used

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  • Method of preparing super-hydrophobic coating by compounding waterborne polyurethane and hydrophobic modified inorganic nanoparticles
  • Method of preparing super-hydrophobic coating by compounding waterborne polyurethane and hydrophobic modified inorganic nanoparticles
  • Method of preparing super-hydrophobic coating by compounding waterborne polyurethane and hydrophobic modified inorganic nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] (1) Preparation of fluorinated titanium dioxide nanoparticles

[0049] Add 10mL of absolute ethanol, 0.2mL of high-purity water and 0.15mL of butyl titanate into a 100ml four-neck flask equipped with a thermometer, a magnet, a reflux condenser, and a nitrogen introduction device. After maintaining at room temperature for 6 hours, add 0.1mL of titanium Butyl titanate, keep it for 12 hours, then add 0.1mL of butyl titanate, after 6 hours to obtain a titanium dioxide nanoparticle dispersion with a particle size of 20-70nm and a mass concentration of 3.2%, add 0.3g of fluorine-containing alkyl trialkoxy base silane (that is, the mass of fluorine-containing alkyl trialkoxy silane is 2.7% of the dispersion liquid), and the electromagnetic stirring was turned on at room temperature for 10 hours to obtain a fluorinated titanium dioxide nanoparticle dispersion liquid.

[0050] (2) Preparation of aqueous polyurethane dispersion

[0051] Add 50g of polytetrahydrofuran ether diol ...

Embodiment 2

[0058] This embodiment is basically the same as the above-mentioned embodiment 1, except that, when preparing the water-based polyurethane, the polytetrahydrofuran ether diol is replaced with polyester diol, thereby obtaining the polyester-type water-based polyurethane. Such as image 3 It can be seen that the prepared composite coating is a superhydrophobic coating, and the contact angle reaches 169°.

Embodiment 3

[0060] (1) Preparation of fluorinated silica nanoparticles

[0061] Add 80mL of chloroform into a four-necked round-bottom flask, pass nitrogen gas for 30min, add 2g of nano-silica with a particle size of 10-40nm, mechanically stir and reflux, and protect with nitrogen, and obtain silica nanoparticles with a mass concentration of 2.4% after 30min. Add 1.50 g of fluoroalkyltrichlorosilane to the dispersion, and stir at 25°C for 48 hours. Filter under reduced pressure, wash with dried chloroform three times, and dry at 50°C for 24h. Put into 30mL acetone and sonicate for 60min to obtain fluorinated silica nanoparticle dispersion.

[0062] (2) Preparation of aqueous polyurethane dispersion

[0063] Add 50g of polyester diol with a molecular weight of 1638 into a four-neck flask, protect it under nitrogen, heat the reaction system to 80°C to melt, add 16.00g of isophorone diisocyanate, and add 0.4g of dibutyltin dilaurate. After 1 hour of heat preservation, 6.00g of 2,2-dimethy...

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Abstract

The invention relates to a method of preparing a super-hydrophobic coating by compounding waterborne polyurethane and hydrophobic modified inorganic nanoparticles. The method comprises the following steps: spraying waterborne polyurethane to a substrate; then placing the substrate horizontally for 15-30 minutes; then spraying a hydrophobic modified inorganic nanoparticle dispersion liquid obtainedin the step 2 to a polyurethane film; and drying the film at room temperature; and finally obtaining the waterborne polyurethane and hydrophobic modified inorganic nanoparticle compound coating. Themethod is simple, non-toxic and pollution-free, forms a graded micro/nano structure organically and inorganically, and can be produced on a large scale.

Description

technical field [0001] The invention belongs to the field of superhydrophobic material manufacturing, and in particular relates to a method for preparing a superhydrophobic coating by compounding water-based polyurethane and hydrophobically modified inorganic nanoparticles. Background technique [0002] As we all know, lotus leaf has superhydrophobic and self-healing properties due to its multi-layered structure and self-regeneration ability. This lotus leaf effect with self-cleaning ability has therefore attracted the special attention of many researchers. Super-hydrophobic materials refer to the contact angle of water droplets on the surface of which is greater than 150°, and the rolling angle is less than 10°. Studies have found that: super-hydrophobic surfaces have excellent properties such as antifouling and self-cleaning, and have great applications in industrial production and life. . Superhydrophobic materials have great application prospects in the fields of constr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D175/06C09D7/62C03C17/42C08G18/66C08G18/48C08G18/42C08G18/34C08G18/12C08G18/32
CPCC03C17/42C03C2218/112C08G18/12C08G18/348C08G18/42C08G18/4854C08G18/6659C08G18/6692C08K2003/2241C08K2201/003C08K2201/011C09D175/06C09D175/08C09D7/62C08K9/06C08K3/22C08K3/36C08G18/3206
Inventor 潘明旺郑浩袁金凤张广林
Owner HEBEI UNIV OF TECH
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