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Preparation method of self-repair super-hydrophobic polyurethane coating

A polyurethane coating and super-hydrophobic technology, which is applied in polyurea/polyurethane coatings, coatings, coated paper base paper, etc., can solve the problems of super-hydrophobic surface being easily damaged, resource and manpower consumption, and harsh preparation conditions. Achieve good superhydrophobic and self-cleaning properties, prolong service life, and simple preparation process

Active Publication Date: 2013-12-18
YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have high requirements on the substrate itself, and superhydrophobic surfaces need to be prepared on specific substrates (such as specific metals such as zirconium, aluminum, titanium, etc.), and the preparation conditions are harsh, while consuming a lot of energy and high manufacturing costs, that is, they are not environmentally friendly. not economical
More importantly, the super-hydrophobic surface is easily damaged during use. To restore it, the surface needs to be reprocessed or replaced, resulting in a lot of resource and manpower consumption.

Method used

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  • Preparation method of self-repair super-hydrophobic polyurethane coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Hydrophobic substance storage: The specific treatment steps are to add 1.8g of porous silica with a particle size of about 10μm and a pore size of 9nm to 5mL of ethanol solution containing 1.0g of stearyl alcohol, and distill it to near dryness in a constant temperature oil bath at 60°C to obtain a self-healing Functional hydrophobic porous materials.

[0026] Preparation of hydrophobic coating: Disperse 0.1g of hydrophobic porous material in 5mL of distilled water, take 1.5mL of the suspension and place it on a glass slide, air-dry at 40°C for 24 hours, then soak the obtained film in tetraethyl orthosilicate solution for 2 minutes, Then take it out and place it in an ammonia atmosphere for 3 hours for ammonolysis, and dry it for 24 hours under ventilated conditions. The resulting coating has self-healing superhydrophobic function.

[0027] The prepared self-healing superhydrophobic coating has a static contact angle of 152°. followed by O 2 Plasma destroys the super...

Embodiment 2

[0029] The storage of hydrophobic substances, the processing steps are: add 1.8g of porous silica with a particle size of about 10μm and a pore size of 9nm to 5mL of ethanol solution containing 1.0g of octadecylamine, and distill to dryness at 60°C in a constant temperature oil bath to obtain a self-healing Functional hydrophobic porous materials.

[0030] Preparation of superhydrophobic coating: Add 1.5g of polyurethane prepolymer and 0.5g of dry hydrophobic porous material to 10mL of acetone, stir evenly, ultrasonically treat for 2min, and spray it on a glass slide with a spray gun at a pressure of 1.5 atmospheres. After standing and curing for 48 hours at room temperature, a superhydrophobic polyurethane / porous silica composite coating can be obtained.

[0031] The static contact angle of the self-healing superhydrophobic coating can be as high as 151°. After 8 times O 2 Plasma damage and self-healing at room temperature, the water contact angle is still higher than 140° ...

Embodiment 3

[0033] Hydrophobic substance storage, the processing steps are: add 1.2g of porous silica with a particle size of about 1.2μm and a pore size of about 3nm to 20mL of an ethanol solution containing 1.0g of perfluorooctanoic acid, and distill to dryness at 75°C in a constant temperature oil bath to obtain a self-healing Functional hydrophobic porous materials. Solvents can be reused.

[0034] Preparation of super-hydrophobic coating: Add 5.0 g of polyurethane prepolymer and 0.5 g of dry hydrophobic porous material to 10 mL of acetone, stir evenly, ultrasonically treat for 2 min, and spray it on a glass slide with a spray gun at a pressure of 1.5 atmospheres. After standing and curing for 48 hours at room temperature, a superhydrophobic polyurethane / porous silica composite coating can be obtained.

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Abstract

The invention discloses a preparation method of a self-repair super-hydrophobic polyurethane coating. According to the preparation method, first a porous material is added to a saturated solution of a low-surface-energy matter, and is distilled to dry in a constant temperature oil bath to obtain a hydrophobic porous material with a self-repair function, then the hydrophobic porous material and ethyl orthosilicate or a polyurethane prepolymer are dispersed in an organic solvent, a dipping or spraying method is used, after curing a coating with super hydrophobic function is obtained, and the super hydrophobic property of the coating can be self-repaired. The preparation method has the advantages of simple process, mild condition and low cost.

Description

technical field [0001] The invention relates to a preparation method of a self-repairing superhydrophobic polyurethane coating, specifically introducing a porous material with self-repairing function into the superhydrophobic coating to provide a self-repairing coating with surface chemical composition and low surface energy characteristics. layer preparation method. Background technique [0002] Superhydrophobicity is a phenomenon widely distributed in nature, and the surfaces of many animals and plants have superhydrophobicity. It has been found that the superhydrophobic surface has both rough surface structure and low surface energy. The surface with superhydrophobic properties has extremely broad application value in industrial and agricultural production and daily life, for example, it can be used for anti-fouling, waterproof, anti-oxidation, drag reduction and noise reduction, etc. Therefore, constructing a special solid surface and studying its wettability has attra...

Claims

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Application Information

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IPC IPC(8): C03C17/28C04B41/83C08J7/04C09D175/04C09D7/12D21H19/72
Inventor 周峰刘钦泽裴小维
Owner YANTAI ZHONGKE RES INST OF ADVANCED MATERIALS & GREEN CHEM ENG
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