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Waterborne polyurethane super-hydrophobic coating and preparation method thereof

A water-based polyurethane and super-hydrophobic coating technology, applied in the field of coatings, can solve problems such as inability to use fabrics, hard coatings, and non-super-hydrophobic coatings

Inactive Publication Date: 2018-05-18
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the formulations of these inventions are complicated, and the coatings are not superhydrophobic
Wu Xuedong et al [invention patent 200810061480.7] made nano-SiO 2 Addition to waterborne epoxy emulsion / hydrophobic agent mixtures produces superhydrophobic coatings, but the coatings are too hard to be used on substrates such as fabrics

Method used

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  • Waterborne polyurethane super-hydrophobic coating and preparation method thereof
  • Waterborne polyurethane super-hydrophobic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Add 2.5g nano-SiO to 40mL ethanol and 7mL water 2 (Zhejiang Wanjing New Material Co., Ltd., SP-30 type, that is, the average particle size is 30nm, the same below), mix evenly under magnetic stirring, ultrasonic 20min, and then add 0.8mL KH560, 0.8 For mLFAS-17, slowly adjust the pH value to about 10 with 25v% ammonia water, and continue to stir and react at room temperature for 30 minutes to obtain a mixed sol containing micro-nano particles, epoxy terminal groups and fluorine-containing short-chain siloxane.

[0026] (2) At room temperature, mix the above sol with 5mL water-based polyurethane emulsion (Hefei Anke Fine Chemical Co., Ltd., PU-116, anionic, solid content 30±1%), and stir magnetically at room temperature for 30 minutes to obtain a water-based polyurethane emulsion. Polyurethane superhydrophobic coating.

[0027] After rolling coating the coating on the glass surface (the liquid film thickness is 30 μm, the same below), bake at 80°C for 1 hour to obta...

Embodiment 2

[0029] (1) Add 2.5g nano-SiO to 40mL ethanol and 7mL water 2 , mix evenly under magnetic stirring, ultrasonic 20min, then add 0.8mL KH550, 0.8mLFAS-17 to the mixture, and react at room temperature for 30min to obtain siloxane mixed sol containing amine groups and fluorine-containing short chains.

[0030] (2) At room temperature, the above sol was mixed with 5 mL of water-based polyurethane emulsion PU-116, and magnetically stirred at room temperature for 30 minutes to obtain a water-based polyurethane superhydrophobic coating.

[0031] After rolling the coating on the glass surface, bake it at 80°C for 1 hour to form a super-hydrophobic coating with a static contact angle of 155.6° and a rolling angle of 4°. The bonding force between the coating and the glass is grade 0, and the surface hardness is 4H.

Embodiment 3

[0033] (1) Add 2.5g nano-SiO to 40mL ethanol and 7mL water 2 , mix well under magnetic stirring, ultrasonic 20min, then add 0.8mL KH560, 0.8mL tridecafluorooctyltriethoxysilane to the mixture, slowly adjust the pH value to about 10 with 25v% ammonia water, and react at room temperature After 30 minutes, a siloxane mixed sol containing epoxy groups and fluorine-containing short chains was obtained.

[0034] (2) At room temperature, the above sol was mixed with 4 mL of water-based polyurethane emulsion PU-116, and magnetically stirred at room temperature for 30 minutes to obtain a water-based polyurethane superhydrophobic coating. Coating and curing according to Example 1, the coating performance is similar to that of Example 1, that is, the static contact angle is 154.6°, and the rolling angle is 3.5°. The bonding force between the coating and the glass is grade 0, and the surface hardness is 4H.

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Abstract

The invention discloses a waterborne polyurethane super-hydrophobic coating and a preparation method thereof. The method comprises the steps that ethyl alcohol, deionized water and inorganic micro-nano particles are mixed to be uniform, ultrasonic treatment is performed for 5-20 min, a mixing solution is obtained, hybridized siloxane and fluorine-containing siloxane are added into the mixing solution, 25 v% ammonium hydroxide is adopted for slowly adjusting the pH value to 9-11, a stirring reaction is performed under the room temperature for 15-60 min, and then mixed sol is obtained; the obtained mixed sol and waterborne polyurethane (WPU) emulsion are mixed, a reaction is performed for 0.5-1 h under the temperature of 20-30 DEG C, and the waterborne polyurethane super-hydrophobic coatingcontaining inorganic nano-particles is obtained. Due to the simple and economical mode, the flexible super-hydrophobic coating can be manufactured, the coating is particularly applicable to textile super-hydrophobic treatment, and the touch of the textile is not affected due to the fact that polyurethane (PU) is flexible.

Description

1. Technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based polyurethane superhydrophobic coating and a preparation method thereof. 2. Background technology [0002] There are many super-hydrophobic phenomena in nature, such as lotus leaves that leave silt without being stained, water striders walking on water without feet getting wet, etc., precisely because of its static contact angle>150 o , while roll angle<10 o . This excellent performance makes water not stick to it at all, and can be used in various fields of the national economy, such as self-cleaning of exterior walls, waterproofing of fabrics, etc. Coatings, especially water-based coatings, are one of the best forms of commercial application of superhydrophobic surfaces, but most of the reported technologies [Applied Surface Science, 2012, 258, 8739-8746; Polymer, 2014, 55, 187-194.] Redesign synthetic fluoropolymer aqueous emulsions that are far less ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D7/62D06M15/564D06M11/79D06M101/32D06M101/06
CPCC09D175/04C08K3/36C08K9/06C08K2003/2241C08K2003/2296C08K2201/011D06M11/79D06M15/564D06M2101/06D06M2101/32D06M2200/12D06M2200/50
Inventor 冯杰张静鲁俊杰
Owner ZHEJIANG UNIV OF TECH
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