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Durably-hydrophilic SiO2 nano mesoporous coating preparation method

A nano-mesoporous and hydrophilic technology, applied in the coating and other directions, can solve the problems of increased contact angle and low porosity of particle coating, and achieve the effects of improved durability, simple preparation method and low production cost.

Inactive Publication Date: 2018-12-25
上海西源新能源技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the pore-forming agent CTAB added in the preparation process of the particle coating can be completely removed by short-time high-temperature annealing at 700°C for 200s, but the small amount of CTAB added causes pores in the particle coating The rate is low, so that the contact angle of the particle coating with water will increase significantly after being placed outdoors for a week

Method used

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Experimental program
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Effect test

Embodiment 1

[0028] The concrete steps of preparation are:

[0029] Step 1, first prepare ethyl tetrasilicate ethanol solution at a molar ratio of ethyl tetrasilicate and ethanol at a ratio of 1:8, and prepare an aqueous solution of nitric acid at a molar ratio of water and nitric acid at a ratio of 4:0.08. Then, according to the molar ratio of ethyl tetrasilicate in the ethyl tetrasilicate ethanol solution to the water in the nitric acid aqueous solution is 1:4, the nitric acid aqueous solution is dropped into the ethyl tetrasilicate ethanol solution drop by drop to obtain the reaction Precursor solution.

[0030] Step 2, first place the reaction precursor solution at 50°C and stir for 3 hours; wherein, the stirring rate is 750r / min to obtain SiO 2 Sol. to SiO 2 Add 3.5wt% pore-forming agent to the sol, stir for 1 hour, and then age for 3 days; wherein, the pore-forming agent is cetyltrimethylammonium bromide to obtain a sol for coating.

[0031] Step 3, first dip the cleaned and drie...

Embodiment 2

[0033] The concrete steps of preparation are:

[0034] Step 1, first prepare ethyl tetrasilicate ethanol solution according to the molar ratio of ethyl tetrasilicate and ethanol as 1:8.5, and prepare nitric acid aqueous solution at the molar ratio of water and nitric acid as 4:0.075. Then, according to the molar ratio of ethyl tetrasilicate in the ethyl tetrasilicate ethanol solution to the water in the nitric acid aqueous solution is 1:4, the nitric acid aqueous solution is dropped into the ethyl tetrasilicate ethanol solution drop by drop to obtain the reaction Precursor solution.

[0035] Step 2, first place the reaction precursor solution at 55°C and stir for 2.8h; wherein, the stirring rate is 750r / min to obtain SiO 2 Sol. to SiO 2 Add 3.9wt% pore-forming agent to the sol, stir for 1.3h, and then age for 2.5d; wherein, the pore-forming agent is cetyltrimethylammonium bromide to obtain a sol for coating.

[0036] Step 3, first dip the cleaned and dried glass substrate ...

Embodiment 3

[0038] The concrete steps of preparation are:

[0039] Step 1: first prepare ethyl tetrasilicate ethanol solution at a molar ratio of ethyl tetrasilicate and ethanol at a ratio of 1:9, and prepare an aqueous solution of nitric acid at a molar ratio of water and nitric acid at a ratio of 4:0.07. Then, according to the molar ratio of ethyl tetrasilicate in the ethyl tetrasilicate ethanol solution to the water in the nitric acid aqueous solution is 1:4, the nitric acid aqueous solution is dropped into the ethyl tetrasilicate ethanol solution drop by drop to obtain the reaction Precursor solution.

[0040] In step 2, first place the reaction precursor solution at 60° C. and stir for 2.5 hours; wherein, the stirring rate is 750 r / min to obtain SiO2 sol. to SiO2 Add 4.3wt% pore-forming agent to the sol and stir for 1.5 hours, then age for 2 days; wherein, the pore-forming agent is cetyltrimethylammonium bromide to obtain a coating sol.

[0041] Step 3, firstly dip the cleaned and ...

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Abstract

The invention discloses durably-hydrophilic SiO2 nano mesoporous coating preparation method. The method includes: respectively preparing tetraethyl orthosilicate ethanol solution and nitric acid aqueous solution, and dropwise adding the nitric acid aqueous solution into the tetraethyl orthosilicate ethanol solution to obtain reaction precursor solution; then, stirring the reaction precursor solution, adding a pore forming agent into obtained SiO2 sol, stirring and aging to obtain sol for coating; finally, subjecting a glass substrate to dip coating in the sol for coating, airing, annealing thecoated glass substrate, cooling, and soaking in water to obtain a durably-hydrophilic SiO2 nano mesoporous coating on the glass substrate, wherein the durably-hydrophilic SiO2 nano mesoporous coatingin thickness of 100-200nm is formed by mesopores in diameter of 1-2nm. The durably-hydrophilic SiO2 nano mesoporous coating preparation method has advantages of energy saving, time saving and low manufacturing cost and can be easily, extensively and commercially applied to preparation of durably-hydrophilic SiO2 nano mesoporous coatings.

Description

technical field [0001] The present invention relates to a kind of preparation method of nano mesoporous coating, especially a kind of durable hydrophilic SiO 2 Preparation method of nanometer mesoporous coating. Background technique [0002] Based on SiO 2 Its own hydrophilicity is often used to prepare superhydrophilic coatings, such as the title "surfactant concentration on nano-mesoporous SiO 2 Influence of film structure", "Functional Materials" Supplement 2004 Volume 35, page 2969-2972 article. The film mentioned in this article is composed of mesoporous pores with a diameter of 1-2nm; its preparation method uses acid as catalyst, Cetyltrimethylammonium bromide (CTAB) was used as a pore-forming agent, and the product was obtained by sol-gel method—nano-mesoporous SiO 2 film. Although the porosity of this product is relatively large, and the size of the mesopores is smaller than that of dust and other pollutants, it is not easy for dust and other pollutants to accumu...

Claims

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Application Information

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IPC IPC(8): C03C17/25
CPCC03C17/25C03C2217/213C03C2217/70C03C2218/113
Inventor 许少辉费广涛王彪张敏倪志龙
Owner 上海西源新能源技术有限公司
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