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Waterborne superhydrophobic coating for building exterior walls, and preparation method and application thereof

A technology for super-hydrophobic coatings and building exterior walls, applied in building insulation materials, anti-fouling/underwater coatings, building components, etc., can solve the problems of complex formulas and coatings that are not super-hydrophobic, and achieve simple preparation processes and good super-hydrophobic properties. Hydrophobic performance, easy operation effect

Inactive Publication Date: 2018-03-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formulations of these inventions are complex, and the coatings are not superhydrophobic

Method used

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  • Waterborne superhydrophobic coating for building exterior walls, and preparation method and application thereof
  • Waterborne superhydrophobic coating for building exterior walls, and preparation method and application thereof
  • Waterborne superhydrophobic coating for building exterior walls, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) 1g SiO 2 (Zhejiang Wanjing New Material Co., Ltd., SP-30, average particle size 30nm, the same below) was added to 30mL of water, and mixed evenly under magnetic stirring, and then 2.5g of silicone emulsion (Shanghai Xianglan Chemical Co., Ltd., ESASIL 505, with a solid content of about 50%) and 1 mL of polyfluoroacrylic resin (Taicang Sinochem Environmental Protection Chemical Co., Ltd., EG616G), and stirred evenly to obtain a superhydrophobic coating.

[0023] (2) Spray the superhydrophobic coating on the glass surface, dry and solidify at 120°C for 20min to form a superhydrophobic coating ( figure 1 ), the static contact angle is 154.2°, and the rolling angle is 6.1°. Other properties are with embodiment 1. After immersing the coating in deionized water, it was found that after 12 hours, the contact angle of the coating still reached 147.7°, the rolling angle was less than 10°, and it still had super-hydrophobic properties (in practical applications, it is rare...

Embodiment 2

[0027] (1) 2g CaCO 3 (1200 mesh, heavy calcium, generally commercially available) was added to 10mL of water, and mixed evenly under stirring, then 1g of silicone emulsion (Shanghai Xianglan Chemical Co., Ltd., ESASIL 505, solid content about 50%) and 1mL containing Fluoroacrylic acid emulsion (Taicang Sinochem Environmental Protection Chemical Co., Ltd., EG616G) was stirred evenly to obtain a superhydrophobic coating.

[0028] (2) Brush the superhydrophobic coating on the glass surface, dry and cure at 120°C for 20 minutes to form a superhydrophobic coating. The static contact angle is 154.4°, and the rolling angle is 9.6°. When the coating is immersed in deionized water, the contact angle and rolling angle basically do not change within 10 hours. Coating mechanics and self-cleaning properties are the same as in Example 1.

Embodiment 3

[0030] (1) 5g CaCO 3 (2000 mesh, light calcium, generally commercially available) was added to 50mL of water, and mixed evenly under stirring conditions, then added 5g of acrylic latex paint (Youtubao durable exterior wall paint, Shanghai Bauhinia Paint Co., Ltd.) and 2.5mL fluorine-containing acrylic emulsion (same as above), stirred evenly to obtain a super-hydrophobic coating.

[0031] (2) Apply the superhydrophobic coating onto the surface of the glass / aluminum plate by dripping or brushing, and dry and cure at 120°C for 20 minutes to form a superhydrophobic coating with a static contact angle of 156.4° and a rolling angle of 10°. Coating mechanics and self-cleaning properties are the same as in Example 1.

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Abstract

The invention discloses a waterborne superhydrophobic coating for building exterior walls. The coating is characterized by being prepared according to the following method: mixing deionized water andinorganic micron-nano-sized particles, carrying out uniform mixing by stirring at a room temperature, then adding a building exterior wall coating emulsion and fluorine-containing acrylic resin, and carrying out uniform stirring so as to obtain the waterborne superhydrophobic coating for building exterior walls, wherein the building exterior wall coating emulsion is one or a mixture of two or moreselected from the group consisting of a silicone-acrylate emulsion, a styrene-acrylic emulsion, a pure acrylic emulsion or an organosilicon emulsion in an arbitrary proportion; and the inorganic micron-nano-sized particles are one or a combination of two or more selected from the group consisting of silicon oxide, calcium carbonate and titanium dioxide. The preparation process provided by the invention is simple and has simple and convenient operations; the building exterior wall coating emulsion is utilized to provide a base bonding force; the fluorine-containing acrylic resin is self-migrated to the surface to form low surface energy; the micron-nano-sized particles provide micro roughness; thus, the coating has excellent superhydrophobicity.

Description

1. Technical field [0001] The invention relates to the technical field of coatings, in particular to a water-based super-hydrophobic coating for exterior walls containing micro-nano particles and a preparation method and application thereof. 2. Background technology [0002] my country is currently in the peak period of urbanization construction, and high-quality exterior wall coatings have broad demand space and development potential. The lack of stain resistance of coatings is a common problem in exterior wall coatings. Both superhydrophilic and superhydrophobic can realize surface rainwater self-cleaning. In the past 20 years, super-hydrophobic surfaces have received much attention, but how to mass-produce super-hydrophobic coatings for exterior walls that are low-cost, easy to coat, and can be cured at room temperature, and the coating is relatively resistant to water immersion or rain is still quite challenging, especially the development of Super-hydrophobic coatings...

Claims

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Application Information

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IPC IPC(8): C09D183/04C09D133/14C09D133/00C09D5/16C09D7/61C03C17/30C03C17/32E04B1/62
CPCC09D183/04C03C17/30C03C17/32C03C2217/445C03C2217/475C03C2217/477C03C2217/478C08K2003/265C08K2201/011C09D5/1681C09D5/1687C09D133/00C09D133/14E04B1/62C08L33/14C08K3/36C08L83/04C08K3/26
Inventor 冯杰孟阳升鲁俊杰张静
Owner ZHEJIANG UNIV OF TECH
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