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Preparation method of super-hydrophobic surface of room temperature vulcanized silicone rubber

A technology of super-hydrophobic surface and room temperature vulcanization, which is applied in the direction of coating, etc., can solve the problems of cumbersome steps, high equipment requirements, complicated preparation process, etc., and achieve the effect of expanding application range, low cost and simple process

Inactive Publication Date: 2015-03-25
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these silicone rubber-based superhydrophobic surface preparation processes are usually very complicated, such as micro-nano-fabrication, nano-etching, electrochemical methods, sol-gel methods, etc., which have disadvantages such as high equipment requirements, long construction period, and high cost, resulting in step The disadvantages of being cumbersome and incapable of large-scale preparation severely restrict the practical application of silicone rubber superhydrophobic surfaces.

Method used

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  • Preparation method of super-hydrophobic surface of room temperature vulcanized silicone rubber
  • Preparation method of super-hydrophobic surface of room temperature vulcanized silicone rubber

Examples

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Effect test

Embodiment 1

[0019] Dissolve 1 mL of n-dodecanethiol in 50 mL of n-hexane at room temperature; then add 10 g of zinc oxide powder with a particle size of 200 to 400 nm to this solution, and magnetically stir to form a suspension; after continuous stirring for 30 min, The suspension is centrifuged and the solid is vacuum dried to constant weight to obtain hydrophobic zinc oxide powder.

[0020] 10 g α, ω-dihydroxy polydimethylsiloxane with a viscosity of 10000 cp, 0.5 g curing agent tetraethoxysilane and 0.05 g catalyst di-n-butyltin dilaurate were dissolved in 10 mL n-hexane at room temperature In the process, the room temperature vulcanized silicone rubber precursor solution is obtained. Then pour the precursor solution on the surface of the flat glass, and use a glass rod to unfold it into a shape of 2 cm×5 cm. After being leveled naturally, it is vacuum degassed at room temperature for 5 min. Put 3 g of hydrophobic zinc oxide powder into a 200-mesh stainless steel sample sieve, sieve it u...

Embodiment 2

[0022] Dissolve 50 μL of n-dodecyltriethoxysilane in 50 ml of absolute ethanol at room temperature; then add 10 g of diatomaceous earth powder with a particle size of 10 μm to this solution, and magnetically stir to form a suspension; continue; After stirring for 30 min, the suspension was centrifuged for analysis, and the solid was vacuum dried to a constant weight to obtain hydrophobic diatomaceous earth powder.

[0023] 10 g α, ω-dihydroxy polydimethylsiloxane with a viscosity of 10000 cp, 0.5 g curing agent tetraethoxysilane and 0.05 g catalyst di-n-butyltin dilaurate were dissolved in 10 mL n-hexane at room temperature In the process, the room temperature vulcanized silicone rubber precursor solution is obtained. Then pour the precursor solution on the surface of the flat glass, and use a glass rod to unfold it into a shape of 5 cm×10 cm. After it is leveled naturally, it is vacuum degassed at room temperature for 5 min. Put 5 g of hydrophobic diatomaceous earth powder into...

Embodiment 3

[0025] Dissolve 20 μL of n-octadecyltrichlorosilane in 50 ml of absolute ethanol at room temperature; then add 5 g of silica particles with a particle size of 12 nm (Meteorological White Carbon Black, Model M5, Shanghai Cabot Chemical Co., Ltd.), magnetically stirred to form a sol; this sol was dried in an electric blast drying oven at 60 ℃ for 24 hours to obtain hydrophobic silica powder.

[0026] Dissolve 5 g α, ω-dihydroxy polydimethylsiloxane with a viscosity of 5000 cp, 0.25 g curing agent tetraethoxysilane and 0.02 g catalyst di-n-butyltin dilaurate in 5 mL n-hexane at room temperature In the process, the room temperature vulcanized silicone rubber precursor solution is obtained. Then pour the precursor solution on the surface of the flat glass, and use a glass rod to unfold it into a shape of 10 cm×10 cm. After it is leveled naturally, it is vacuum degassed at room temperature for 5 min. Put 2 g of hydrophobic silica powder into a 500-mesh stainless steel sample sieve, si...

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Abstract

The invention discloses a preparation method of a super-hydrophobic surface of room temperature vulcanized silicone rubber. The preparation method comprises the following steps: (1) preparing 100 parts of alpha, omega-dyhydroxyl polydimethylsiloxane, 4-6 parts of a curing agent tetraethoxysilane, 0.1-0.5 part of a catalyst di-n-butyltin dilaurate and 20-100 parts of a solvent normal hexane into a viscous solution, pouring into a solution film which is 200-500 microns thick on sheet glass and defoaming in vacuum at room temperature; (2) uniformly sieving 5-20 parts of a hydrophobic powder additive on the surface of the viscous solution of room temperature vulcanized silicone rubber which is not cured by virtue of an 80-400-mesh stainless steel sample sieve; and (3) after standing for 24 hours at room temperature, eliminating residual powder on the surface to obtain the super-hydrophobic surface of room temperature vulcanized silicone rubber. The super-hydrophobic surface of room temperature vulcanized silicone rubber disclosed by the invention is simple in preparation method, and the used raw materials are easily available and low in price, so that the super-hydrophobic surface of room temperature vulcanized silicone rubber can be used for surface waterproofness, pollution prevention and self-cleaning of building materials.

Description

Technical field [0001] The invention relates to a method for preparing a superhydrophobic surface, in particular to a method for preparing a superhydrophobic surface on a room temperature vulcanized silicone rubber material substrate. Background technique [0002] Silicone rubber has good resistance to high and low temperatures, and maintains its original strength and elasticity in the temperature range of minus 90 ℃ to 250 ℃. In addition, silicone rubber also has excellent electrical insulation, oxygen and aging resistance, light and aging resistance, mildew resistance, chemical stability, etc. Since silicone rubber products have excellent comprehensive properties, they have been widely used in various fields of electrical, electronics, aerospace, automotive, machinery and chemical engineering, instrumentation, and other industries as well as medical and health daily life. However, currently commercially available silicone rubber does not have superhydrophobicity. [0003] The s...

Claims

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Application Information

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IPC IPC(8): C08J7/06C08J7/04C08L83/06
Inventor 王法军沈涛华李长全欧军飞
Owner NANCHANG HANGKONG UNIVERSITY
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