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Preparation method of hydrophobic material based on silica

A technology of silica, hydrophobic material, applied in coating and other directions, can solve problems such as poor durability and wear resistance

Inactive Publication Date: 2018-12-14
苏州汉力新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although hydrophobic materials have shown excellent properties and great application prospects in the above aspects, because the artificially prepared hydrophobic surface is different from the hydrophobic surface in nature, its durability and wear resistance are relatively poor.

Method used

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Examples

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Effect test

preparation example Construction

[0020] The invention discloses a preparation method based on silicon dioxide hydrophobic material, and the preparation method comprises the following steps:

[0021] (1) Using ethyl orthosilicate as a raw material, add absolute ethanol, stir for 20-40 minutes, then add ammonia water to adjust the pH of the reaction solution to 8-10, and continue stirring for 1-2 hours to obtain a silica suspension;

[0022] (2) Add absolute ethanol to the above silicon dioxide suspension, sonicate for 1-2 hours, then add a certain amount of stearic acid, continue to sonicate for 20-40 minutes, and then put the ultrasonic mixture at 65-75°C Stir magnetically for 8-12 hours, stir at room temperature for 5-8 hours, and prepare the product for later use. Each 1L of the mixture contains 50-100g of stearic acid;

[0023] (3) Add a certain amount of absolute ethanol to the product obtained in step (2), stir evenly, and then apply the resulting mixture to the surface of the pretreated metal substrate,...

Embodiment 1

[0029] (1) Using ethyl orthosilicate as a raw material, add absolute ethanol, stir for 20 minutes, then add ammonia water to adjust the pH value of the reaction solution to 8, continue stirring for 1 hour, and obtain a silica suspension with a concentration of 0.1 g / mL, Wherein, the mass ratio of described ethyl orthosilicate, described dehydrated alcohol, described ammoniacal liquor is 40:100:3;

[0030] (2) Add absolute ethanol to the above silica suspension, sonicate for 1h, then add a certain amount of stearic acid, continue to sonicate for 20min, then magnetically stir the mixture after sonication at 65°C for 8h, and stir at room temperature 5h, the product is ready for use, wherein, every 1L of the mixed solution contains 50g of stearic acid;

[0031] (3) Add the same volume of absolute ethanol to the product obtained in step (2), stir evenly, then coat the resulting mixture on the surface of the pretreated metal substrate, volatilize the solvent at 90°C, and then Dry a...

Embodiment 2

[0033] (1) Using ethyl orthosilicate as raw material, add absolute ethanol, stir for 30 minutes, then add ammonia water to adjust the pH value of the reaction solution to 9, continue stirring for 1.5 hours, and obtain a silica suspension with a concentration of 0.5g / mL , wherein, the mass ratio of described ethyl orthosilicate, described dehydrated alcohol, described ammoniacal liquor is 45:110:6;

[0034] (2) Add absolute ethanol to the above silicon dioxide suspension, sonicate for 1.5h, then add a certain amount of stearic acid, continue to sonicate for 30min, then magnetically stir the mixture after sonication at 70°C for 10h, room temperature Stir for 6 hours, and the product is set aside, wherein, every 1L of the mixed solution contains 70g of stearic acid;

[0035] (3) Add the same volume of absolute ethanol to the product obtained in step (2), stir evenly, then coat the resulting mixture on the surface of the pretreated metal substrate, volatilize the solvent at 90°C, ...

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PUM

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Abstract

The invention discloses a preparation method of a hydrophobic material based on silica. The preparation method comprises: (1) adding anhydrous ethanol into ethyl orthosilicate as a raw material, stirring the mixture for 20-40min, adding ammonia water to adjust the pH value of the reaction liquid to 8-10 and carrying out stirring for 1-2h to obtain a silica suspension liquid, (2) adding anhydrous ethanol into the silica suspension liquid, carrying out ultrasonic treatment for 1-2h, adding a certain amount of stearic acid into the suspension liquid, carrying out ultrasonic treatment for 20-40min, carrying out magnetic stirring on the mixed solution subjected to ultrasonic treatment at 65-75 DEG C, and carrying out stirring at the room temperature for 5-8h to obtain a product for next use, and (3) adding a certain amount of anhydrous ethanol into the product obtained in the step (2), carrying out uniform stirring, coating the surface of a pretreated metal base with the mixed solution, volatilizing the solvent at 90 DEG C and carrying out drying at 100-120 DEG C for 1-2h to obtain the hydrophobic material based on silica. The hydrophobic material based on silica has superhydrophobic properties and can maintain superhydrophobic properties after being stored at the room temperature for a long time.

Description

technical field [0001] The invention relates to the technical field of hydrophobic materials, in particular to a method for preparing a silicon dioxide-based hydrophobic material. Background technique [0002] The wettability of the material surface depends on the surface chemical properties and microstructure of the material. The so-called superhydrophobic surface refers to the surface with a contact angle with water greater than 150°, and a rolling angle less than 10°. Due to the wide application prospects of hydrophobic materials in waterproof, anti-fog, anti-snow, anti-pollution, anti-adhesion, anti-oxidation, anti-corrosion, self-cleaning, and prevention of current conduction, they have attracted extensive attention from material science researchers. [0003] Although hydrophobic materials have shown excellent properties and great application prospects in the above aspects, their durability and wear resistance are relatively poor because the artificially prepared hydrop...

Claims

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Application Information

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IPC IPC(8): C09D1/00C09D5/00C09D7/63
CPCC09D1/00C09D5/00C09D7/63
Inventor 徐伟
Owner 苏州汉力新材料有限公司
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