Super-hydrophobic coating and preparation method thereof

A super-hydrophobic coating and coating technology, which is applied in the direction of coatings, chemical instruments and methods, and layered products, can solve the problems of high potential hazards, poor coating transparency, and easy residue, etc., and achieve low cost and easy application. Convenience, good durability effect

Active Publication Date: 2014-04-30
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The patent document with the publication number CN102963087A discloses a silicone super-hydrophobic nanocomposite coating and its preparation method and application. layer and a silicone resin coating that does not contain inorganic powder as an outer coating, or the composite coating includes in turn: a base material, a silicone resin coating that does not contain inorganic powder as an inner coating and as an outer coating The layer of organic silicon resin coating containing inorganic powder has poor transparency, and N, N-dimethylacetamide and other solvents with high boiling point, low volatility and high toxicity are used in the preparation process, which are easy to remain on the coating. Internal, potentially hazardous

Method used

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  • Super-hydrophobic coating and preparation method thereof

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Embodiment 1

[0048] 1, Sol-gel method to prepare nano-silica nanoparticle dispersion: add 100mL deionized water and 40mL tetraethyl orthosilicate to 600mL absolute ethanol, add 14mL concentrated ammonia water drop by drop under stirring to obtain a particle size of about 100nm The mass fraction is 20% ethanol dispersion of silica particles.

[0049]2. Preparation of silicone-modified polyurethane: use aminoethylaminopropylmethyldimethoxysilane and hydroxyl silicone oil (hydroxyl content 3%) to react to obtain amino-terminated silicone, dissolve it in isopropanol, and use TDI and dimethoxysilane Hydroxyl polyether (PPG, hydroxyl content 4.2%) was reacted to obtain a polyurethane prepolymer with an isocyanate content of 10%, dissolved in isopropanol, and the amino-terminated silicone solution and the polyurethane prepolymer solution were mixed and reacted at a molar ratio of 2:1 Obtaining mass fraction is 1% organosilicon modified polyurethane solution, the infrared spectrum of intermedia...

Embodiment 2

[0058] 1, Preparation of nano-silica dispersion by sol-gel method: add 100mL deionized water and 40mL tetraethyl orthosilicate to 600mL absolute ethanol, add 14mL concentrated ammonia water drop by drop under stirring, and obtain a particle size of about 100nm The fraction is 20% silica ethanol dispersion.

[0059] 2. Preparation of silicone-modified polyurethane: react with aminoethylaminopropylmethyldimethoxysilane and hydroxyl silicone oil to obtain amino-terminated silicone (3% hydroxyl content), dissolve it in isopropanol, and use TDI and dihydroxy Polyether (PPG, hydroxyl content 4.2%) is reacted to obtain a polyurethane prepolymer with an isocyanate content of 10%, which is dissolved in isopropanol, and the amino-terminated silicone solution and polyurethane prepolymer solution are mixed and reacted at a molar ratio of 1:2 to obtain Silicone-modified polyurethane solution with a mass fraction of 0.5%.

[0060] 3. Spin-coat the organosilicon-modified polyurethane solu...

Embodiment 3

[0064] 1, Preparation of nano-silica dispersion by sol-gel method: add 100mL deionized water and 40mL tetraethyl orthosilicate to 600mL absolute ethanol, add 14mL concentrated ammonia water drop by drop under stirring, and obtain a particle size of about 100nm A 20% silica isopropanol dispersion.

[0065] 2. Preparation of silicone-modified polyurethane: react with aminoethylaminopropylmethyldimethoxysilane and hydroxyl silicone oil to obtain amino-terminated silicone (5% hydroxyl content), dissolve it in isopropanol, and use MDI and dihydroxy Polyether (PPG, hydroxyl content 4.2%) is reacted to obtain a polyurethane prepolymer with an isocyanate content of 10%, which is dissolved in isopropanol, and the amino-terminated silicone solution and polyurethane oligomer solution are mixed and reacted at a molar ratio of 2:1 to obtain Silicone-modified polyurethane solution with a mass fraction of 8%.

[0066] 3. Spin-coat the organosilicon-modified polyurethane solution and the s...

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Abstract

The invention discloses a super-hydrophobic coating. The super-hydrophobic coating comprises an inorganic layer and an organic layer which are alternatively coated on a substrate, wherein the inorganic layer is an inorganic nanoparticle layer, the organic layer is an organic silicone-modified polyurethane layer, and the bottommost layer and the topmost layer are organic layers. The invention further discloses a preparation method for the super-hydrophobic coating, and is not required for expensive materials and instruments, low in cost and convenient to apply, and capable of carrying out large-area application work; the prepared super-hydrophobic coating has the advantages of being super-high in hydrophobicity, high in transparency and durability, and free from the damage of corrosive liquid, and has no special requirement on the material of the substrate, and the used solvent is non-toxic, low in boiling points, and easy to volatilize, and no residuals exist after the coating is formed.

Description

technical field [0001] The invention relates to the technical field of hydrophobic coating materials, in particular to a superhydrophobic coating and a preparation method thereof. Background technique [0002] Inspired by the lotus leaf effect, the preparation of material surfaces with superhydrophobic properties has attracted extensive attention and attention. A superhydrophobic surface generally refers to a surface with a water droplet contact angle greater than 150°. The superhydrophobic surface has the characteristics of waterproof and self-cleaning, so it has very broad application prospects in daily life and industrial and agricultural production. According to the current understanding, the preparation mechanism of superhydrophobic surface is generally divided into two categories: one is to construct a microstructure with a certain roughness on the surface of low surface energy materials, and the other is to use low surface energy materials to modify the rough surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/40C09D175/08C08G18/61C08G18/48C08G18/10
Inventor 杜淼李房郑强
Owner ZHEJIANG UNIV
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