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Polydimethylsiloxane-double-scale silica composite superhydrophobic coating and its forming method

A polydimethylsiloxane, superhydrophobic coating technology, applied in the field of materials

Active Publication Date: 2020-10-27
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the common problems of current super-hydrophobic coatings, the present invention provides a super-hydrophobic coating material with simple preparation process, good durability and certain elasticity on the surface and its forming method, which can be used for different substrate materials, especially on rough surfaces In terms of structure, a secondary surface rough structure is obtained by curing the polydimethylsiloxane coating material containing large-size silica nanoparticles and then burning the coating.

Method used

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  • Polydimethylsiloxane-double-scale silica composite superhydrophobic coating and its forming method
  • Polydimethylsiloxane-double-scale silica composite superhydrophobic coating and its forming method
  • Polydimethylsiloxane-double-scale silica composite superhydrophobic coating and its forming method

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Experimental program
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Effect test

Embodiment 1

[0038] (1) Preparation of silica nanoparticles

[0039] First, 90ml of absolute ethanol, 3.9ml of ammonia water (mass fraction 25%), and 3.9ml of pure water were blended in a round bottom flask, magnetically stirred at 500r / min, and after stirring for 5min, 2.1ml of orthosilicic acid was added to the above mixed solution. Ethyl ester (analytically pure, the same below), the reaction was carried out for 4h. After the reaction was completed, the mixed solution was placed in a sample tube for centrifugation. The centrifuge speed is 6000r / min, and the centrifugation time is 3min. After the centrifugation is completed, a solid-liquid separation system with a white precipitate at the bottom and a clear upper layer is obtained. The white precipitate at the bottom was repeatedly washed with absolute ethanol several times, and then dried in a 60°C drying oven for 5 hours to obtain silica nanoparticles. The average particle diameter was determined to be 200nm.

[0040] (2) Take 0.05 g...

Embodiment 2

[0047] (1) Preparation of silica nanoparticles

[0048] First, 60ml of absolute ethanol, 8ml of ammonia water (mass fraction 25%), and 3.9ml of pure water were blended in a round-bottomed flask, the reaction temperature was 40°C, and magnetic stirring was performed at 500r / min. After stirring for 5min, add 5ml of ethyl orthosilicate, the reaction was carried out for 6h. After the reaction is completed, the mixture is placed in a sample tube for separation. The centrifuge speed is 6000r / min, and the centrifugation time is 3min. After the centrifugation is completed, a solid-liquid separation system with a white precipitate at the bottom and a clear upper layer is obtained. The white precipitate at the bottom was repeatedly washed with absolute ethanol several times, and then dried in a 60°C drying oven for 5 hours to obtain silica nanoparticles. The average particle diameter was measured to be 500nm.

[0049] (2) Take 0.05 g of the above-mentioned silica nanoparticles in a s...

Embodiment 3

[0054] (1) Preparation of silica nanoparticles

[0055] First, blend 90ml of absolute ethanol, 3.9ml of ammonia water, and 3.9ml of pure water into a round-bottomed flask, stir magnetically at 500r / min, and after stirring for 5min, add 2.1ml of ethyl orthosilicate to the above mixture, and react for 4h .Place the mixed solution after the reaction in the sample tube for separation. The centrifuge speed is 6000r / min, and the centrifugation time is 3min. After the centrifugation is completed, a solid-liquid separation system with a white precipitate at the bottom and a clear upper layer is obtained. The white precipitate at the bottom was repeatedly washed with absolute ethanol several times, and then dried in a 60°C drying oven for 5 hours to obtain silica nanoparticles. The average particle diameter was determined to be 200nm

[0056] (2) Take 0.2 g of the above silica nanoparticles in a sample tube, add 2 ml of ethyl acetate, vibrate with an oscillator for 5 min, and then ul...

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Abstract

The invention relates to a polydimethylsiloxane-dual scale silicon dioxide composite super-hydrophobic coating and a forming method thereof. The composite super-hydrophobic coating comprises a polydimethylsiloxane layer and silicon dioxide particles uniformly dispersed on the polydimethylsiloxane layer. The composite super-hydrophobic coating is obtained by a method of curing a polydimethylsiloxane coating material containing large-particle-size silicon dioxide nanoparticles and then firing the coating, and the composite super-hydrophobic coating is of a secondary rough surface structure. According to the invention, the durability of the coating is strengthened, and the super-hydrophobic performance of the surface is recovered by a method of polishing or re-firing, so as to keep the excellent performance of the coating for a long time.

Description

technical field [0001] The invention relates to the field of materials, in particular to a polydimethylsiloxane-double-scale silicon dioxide composite superhydrophobic coating and a forming method thereof. Background technique [0002] Coating on the surface of materials is an important means to change the surface properties of materials, and wettability is an important characteristic of the surface of materials, such as the spreading of water on the surface of glass, the infiltration of rainwater on the surface of fabrics, etc. The surface of the lotus leaf has attracted interest due to its good hydrophobic properties. For this reason, superhydrophobic coating materials based on the lotus leaf effect have long attracted people's attention and are widely used in antifouling, anticorrosion, self-cleaning, drag reduction and other aspects. The effect of superhydrophobicity is usually measured by the water contact angle and rolling angle of the material surface. Typically, a ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C09D7/61
CPCC08K2201/011C09D183/04C09D7/61C08K3/36
Inventor 田丽梅林熠赵杰范勇
Owner JILIN UNIV
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