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Preparation method for super-hydrophobic silica particle and super-hydrophobic coating

A super-hydrophobic coating, silica technology, applied in silica, silica, coating and other directions, can solve the problems of time-consuming pretreatment steps, strict process conditions, expensive chemical modifiers and special equipment, etc. Good effect, simple and practical effect of preparation process

Inactive Publication Date: 2017-04-26
THE HONG KONG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] According to the present invention, many existing bionic superhydrophobic coatings can be manufactured by imitating the micro / nano structure of lotus leaves, using templates, etching, chemical deposition and assembly; however, most of the manufacturing methods involve a lot of time-consuming Due to the problems of pretreatment steps, strict process conditions, expensive chemical modifiers and special equipment, a method for preparing superhydrophobic silica particles and superhydrophobic coatings is proposed

Method used

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  • Preparation method for super-hydrophobic silica particle and super-hydrophobic coating
  • Preparation method for super-hydrophobic silica particle and super-hydrophobic coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Modification of nano-silica particles

[0039]Add 3.0 g of nano-silica particles with an average particle size of 50 nm and 3.6 g of distilled water into 100 mL of ethanol, and ultrasonically disperse for 30 min; Wherein the material molar ratio is SiO 2 :H 2 O:TEOS=1:4:1:0.2-0.5), and stir evenly, then use 1mol / L hydrochloric acid to adjust the pH value to 2.0-3.0, then electromagnetically stir at room temperature for 24h, and then use ammonia water with a mass fraction of 1.2% to adjust The pH value was 6.0-7.5, and the stirring was continued for 0.5h to obtain a milky white suspension.

[0040] (2) Ultrasonic spray drying

[0041] Pass the milky white suspension obtained in step (1) of this embodiment into an ultrasonic spray dryer through a peristaltic pump for drying, and during the drying process, ultrasonic dispersion is used; in this process, the inlet temperature of the spray dryer is 90°C , the flow rate of the milky white suspension is 300mL / h, and th...

Embodiment 2

[0045] (1) Modification of nano-silica particles

[0046] Add 3.0g of nano-silica particles with an average particle size of 50nm and 3.6g of distilled water into 100mL of ethanol, and ultrasonically disperse for 30min; (wherein the material molar ratio is SiO 2 :H 2 O:TEOS=1:4:1:0.2-0.5), and stir evenly, then use 1mol / L hydrochloric acid to adjust the pH value to 2.0-. Adjust the pH value to 6.0-7.5, and continue to stir for 0.5h to obtain a milky white suspension.

[0047] (2) Ultrasonic spray drying

[0048] Pass the milky white suspension obtained in step (1) of this embodiment into an ultrasonic spray dryer through a peristaltic pump for drying, and during the drying process, ultrasonic dispersion is used; in this process, the inlet temperature of the spray dryer is 90°C , the flow rate of the milky white suspension is 300mL / h, and the fan frequency is 50Hz; through this step, white particles can be collected.

[0049] (3) Preparation of superhydrophobic coating

...

Embodiment 3

[0053] (1) Modification of nano-silica particles

[0054] Add 3.0g of nano-silica particles with an average particle size of 50nm and 3.6g of distilled water into 100mL of ethanol, and ultrasonically disperse for 30min; then add 2.215g of amino-containing silane (ATEOS) and fluorine-containing silane (FTEOS) The material molar ratio is SiO 2 :H 2 O:ATEOS=5:20:1:0.2-0.5), and stir evenly, then use 1mol / L hydrochloric acid to adjust the pH value to 2.0-3.0, then electromagnetically stir at room temperature for 24h, and then adjust with 1.2% ammonia water The pH value was 6.0-7.5, and the stirring was continued for 30 minutes to obtain a milky white suspension.

[0055] (2) Ultrasonic spray drying

[0056] Pass the milky white suspension obtained in step (1) of this embodiment into an ultrasonic spray dryer through a peristaltic pump for drying, and during the drying process, ultrasonic dispersion is used; in this process, the inlet temperature of the spray dryer is 90°C , th...

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Abstract

The invention provides a preparation method for super-hydrophobic silica particles and super-hydrophobic coatings. The method includes the following steps that in step S1, nanometer silica particles and silane modifiers are dispersed in a solvent to form a mixed solution, wherein weight ratio for nanometer silica particles and silane modifiers and the solvent is 1:0.05-0.5:3-20; the PH value of the mixed solution is adjusted to 2.0-5.0 by hydrochloric acid, and then the mixed solution is stirred for 2 to 24 hours at the temperature from 0 DEG C to 50 DEG C; the PH value of the mixed solution is adjusted to 6.0-7.5 by ammonia water, and then the mixed solution is stirred for 0.5 to 3 hours; a dispersion solution of modified nanometer silica particles is achieved; in step S2 the dispersion solution is dispersed into droplets by an ultrasonic nebulization technology and is dried at the temperature from 80 DEG C to 120 DEG C; the super-hydrophobic silica particles are achieved. With the preparation method for super-hydrophobic silica particles and super-hydrophobic coatings, the super-hydrophobic silica particles and the super-hydrophobic coatings are achieved, and have the advantages of being good in super-hydrophobic effect and simple in manufacturing process.

Description

technical field [0001] The invention relates to the field of superhydrophobic materials, in particular to a preparation method of superhydrophobic silicon dioxide particles and a superhydrophobic coating. Background technique [0002] According to the degree of wetting of water on the solid surface (the size of the contact angle), solids can be divided into two categories: hydrophilic and hydrophobic. Among them, the solid surface with a contact angle greater than 150° and a rolling angle less than 10° is usually called superhydrophobic. surface. There are a large number of vivid examples of superhydrophobic surfaces in nature, such as the surfaces of many plant leaves, petals, waterfowl feathers, and insect feet. Due to the extremely broad application prospects of superhydrophobic surfaces in the fields of waterproof, anti-ice, anti-fog, anti-fouling, anti-corrosion, anti-snow, and self-cleaning, it has attracted great attention in both academia and business circles. Base...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C09D7/12C09D163/00C09D167/08C09D175/04C09D1/00
CPCC01B33/12C08K3/36C09D1/00C09D7/70C09D163/00C09D167/08C09D175/04
Inventor 崔智邦王国成黄文飞肖叶兰杜雪
Owner THE HONG KONG POLYTECHNIC UNIV
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