Method for preparing super-hydrophobic silicon dioxide powder and super-hydrophobic coating from composite silicon source

A technology of super-hydrophobic coating and silica powder, applied in the directions of silica, silica, coating, etc., can solve the problems of complex process, inability to control the particle size of silica well, and high cost. The effect of strong superhydrophobicity

Active Publication Date: 2015-09-16
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, these existing solutions are complicated in process and high in cost, and the prepared silica cannot control the particle size well, and the surface roughness is low, so it cannot expand the application range in real life.

Method used

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  • Method for preparing super-hydrophobic silicon dioxide powder and super-hydrophobic coating from composite silicon source
  • Method for preparing super-hydrophobic silicon dioxide powder and super-hydrophobic coating from composite silicon source

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preparation example Construction

[0025] A preparation method of superhydrophobic silica powder and superhydrophobic coating based on glass, comprising the following steps

[0026] 1) Dissolve sodium silicate in water, and prepare a sodium silicate aqueous solution with a concentration of 0.1-0.5mol / L under the condition of sufficient stirring, and dissolve ethyl orthosilicate in a certain volume of absolute ethanol to make a concentration Alcoholic solution of 2-4mol / L tetraethyl orthosilicate;

[0027] 2) Under the action of magnetic stirring, slowly add tetraethyl orthosilicate alcohol solution into sodium silicate aqueous solution, the volume ratio of the two is 1:2, after a period of time, white suspensions begin to appear in the system;

[0028] 3) Use concentrated hydrochloric acid to adjust the pH value of the solution in the above system to 2-4, then continue the magnetic stirring reaction for 2-4 hours, filter the obtained white precipitate, wash it with water and ethanol three times, dry it at 100°C...

Embodiment 1

[0034] 1) Sodium silicate is dissolved in water, and a sodium silicate aqueous solution with a concentration of 0.2mol / L is prepared under the condition of sufficient stirring;

[0035] 2) dissolving ethyl orthosilicate in a certain volume of absolute ethanol to configure a 2mol / L ethyl orthosilicate alcohol solution;

[0036] 3) Under the action of magnetic stirring, slowly add 50mL tetraethyl orthosilicate alcohol solution into 100mL sodium silicate aqueous solution, and a white suspension appears in the solution;

[0037] 4) Use hydrochloric acid to adjust the pH value of the solution in the above system to 2, then continue the magnetic stirring reaction for 2 hours, filter the obtained white precipitate, rinse with water and ethanol three times, dry it for 0.5 hours, and then calcinate it at 500°C for 2 hours to obtain micro- Nanostructured silica;

[0038] 5) Dissolve 1g of silicon dioxide and 8g of vinyltrimethoxysilane in 100mL of anhydrous ethyl alcohol and mix them e...

Embodiment 2

[0041] 1) Dissolving sodium silicate in water, and forming a sodium silicate aqueous solution with a concentration of 0.2mol / L under sufficient stirring conditions;

[0042] 2) dissolving ethyl orthosilicate in a certain volume of absolute ethanol to configure a 2mol / L ethyl orthosilicate alcohol solution;

[0043] 3) Under the action of magnetic stirring, slowly add 50mL tetraethyl orthosilicate alcohol solution into 100mL sodium silicate aqueous solution, and a white suspension appears in the solution;

[0044] 4) Use hydrochloric acid to adjust the pH value of the solution in the above system to 2, then continue the magnetic stirring reaction for 2 hours, filter the obtained white precipitate, wash it with water and ethanol three times, dry it for 0.5 hour, and then calcinate it at 500°C for 3 hours to obtain micro - nanostructured silica;

[0045] 5) Dissolve 1g of silicon dioxide and 10g of vinyltrimethoxysilane in 150mL of anhydrous ethyl alcohol and mix them evenly, th...

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Abstract

The invention discloses a method for preparing super-hydrophobic silicon dioxide powder and a super-hydrophobic coating from a composite silicon source. The method is characterized by preparing micro-nano silicon dioxide by taking sodium silicate and tetraethoxysilane as the composite silicon source. The method comprises the following steps: hydrolyzing tetraethoxysilane in an alkaline solution prepared from sodium silicate to prepare a white suspension, then adjusting pH of the overall hydrolysis solution by hydrochloric acid, accelerating hydrolysis condensation of sodium silicate to synthesize silicon dioxide particles with micro-nano double-micro-scale; and modifying the silicon dioxide particles by vinyl trimethoxysilane to prepare super-hydrophobic silicon dioxide. By virtue of the method, a super-hydrophobic coating is prepared on the surface of the glass; the surface of the coating is characterized by an atomic force microscope; 1-3-micro bulges are formed in the surface of the coating; 300-800-nm small bulges are fully distributed on the bulges, so that the structural effect similar to the lotus leaf surface is generated; the super-hydrophobic effect is achieved; the water contact angle of the surface of the coating reaches 172 degrees.

Description

【Technical field】 [0001] The invention belongs to the technical field of superhydrophobic material preparation, and relates to a method for preparing superhydrophobic silicon dioxide powder and superhydrophobic coating with a composite silicon source. 【Background technique】 [0002] A superhydrophobic material refers to a material whose surface has a water contact angle greater than 150° and a water contact hysteresis angle less than 5°. The research results show that superhydrophobic surfaces can be prepared in two ways. One is to change the roughness and surface morphology of the surface of the material on the surface of the hydrophobic material; the other is to modify the surface with a low surface energy substance on the surface with a certain roughness. Because superhydrophobic materials have a very wide range of applications, such as waterproof, anti-fog, anti-snow, anti-pollution and self-cleaning and other important properties, they have extremely broad application p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C03C17/23C01B33/12
Inventor 杨辉高红芳
Owner SHAANXI UNIV OF SCI & TECH
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