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SiO2 acid-base composite nanometer coating with porous structure and preparation method thereof

A technology of porous structure and nano-coating, which is applied in the field of SiO2 acid-base composite nano-coating and its preparation, can solve the problems of low porosity, unsatisfactory hydrophilicity, poor anti-reflection effect, etc., and achieves a simple preparation method. , low cost and easy preparation

Active Publication Date: 2019-09-24
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this kind of anti-reflection film has certain roughness and wear resistance, it and its preparation method have shortcomings. First, the loose alkali-catalyzed particles are completely filled with dense acid-catalyzed thread Permeable film, because of its low porosity, the anti-reflection effect is not good, and the hydrophilicity is not ideal; secondly, the preparation method cannot simultaneously obtain products with good hydrophilicity, abrasion resistance and high light transmittance

Method used

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  • SiO2 acid-base composite nanometer coating with porous structure and preparation method thereof
  • SiO2 acid-base composite nanometer coating with porous structure and preparation method thereof
  • SiO2 acid-base composite nanometer coating with porous structure and preparation method thereof

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Effect test

Embodiment 1

[0045] The concrete steps of preparation are:

[0046] Step 1, first prepare ethyl tetrasilicate ethanol solution according to the molar ratio of ethyl tetrasilicate and ethanol as 1:8. Then prepare a mixed aqueous solution according to the molar ratio of ethanol, water and ammonia water at a ratio of 12:5:0.3.

[0047] Step 2: First, according to the ratio of ethyl tetrasilicate ethanol solution and ethanol in the mixed aqueous solution at a ratio of 1:1, the ethyl tetrasilicate ethanol solution is dropped into the mixed aqueous solution drop by drop to obtain an alkalization reaction precursor solution. Then the alkalization reaction precursor solution was placed at 25°C and stirred at a rate of 500r / min for 8h to obtain SiO 2 Aging for 5 days after alkaline sol.

[0048] Step 3, first to the aged SiO 2 Aqueous nitric acid solution with a concentration of 66% was added dropwise to the alkaline sol to make the pH value 2, and then water, a mixture of ethanol and ethyl tetr...

Embodiment 2

[0052] The concrete steps of preparation are:

[0053] Step 1, first prepare ethyl tetrasilicate ethanol solution according to the molar ratio of ethyl tetrasilicate and ethanol as 1:9. Then prepare a mixed aqueous solution according to the molar ratio of ethanol, water and ammonia water at a ratio of 11:5:0.3.

[0054] Step 2: First, according to the ratio of ethyl tetrasilicate ethanol solution and ethanol in the mixed aqueous solution at a ratio of 1:1, the ethyl tetrasilicate ethanol solution is dropped into the mixed aqueous solution drop by drop to obtain an alkalization reaction precursor solution. Then put the alkalization reaction precursor solution at 28°C and stir for 7.5h at a rate of 500r / min to obtain SiO 2 Alkaline sol post aging 5.5d.

[0055] Step 3, first to the aged SiO 2 Add a concentration of 66.5% nitric acid aqueous solution to the alkaline sol dropwise to make the pH value 1.8, then add water and a mixture of ethanol and ethyl tetrasilicate to it in ...

Embodiment 3

[0059] The concrete steps of preparation are:

[0060] Step 1, first prepare an ethyl tetrasilicate ethanol solution according to the molar ratio of ethyl tetrasilicate and ethanol of 1:10. Then prepare a mixed aqueous solution according to the molar ratio of ethanol, water and ammonia water at a ratio of 10:5:0.3.

[0061] Step 2: First, according to the ratio of ethyl tetrasilicate ethanol solution and ethanol in the mixed aqueous solution at a ratio of 1:1, the ethyl tetrasilicate ethanol solution is dropped into the mixed aqueous solution drop by drop to obtain an alkalization reaction precursor solution. Then put the alkalization reaction precursor solution at 30°C and stir for 7h at a rate of 500r / min to obtain SiO 2 Alkaline sol post aging 6d.

[0062] Step 3, first to the aged SiO 2 Add a 67% aqueous solution of nitric acid dropwise to the alkaline sol to make the pH value 1.5, then add water and a mixture of ethanol and ethyl tetrasilicate to it in turn, wherein th...

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Abstract

The invention discloses a SiO2 acid-base composite nanometer coating with a porous structure and a preparation method thereof. The coating consists of a multi-slit film with the thickness of 150-200 nm, and a substrate is covered with the multi-slit film, wherein the multi-slit film is formed by placing SiO2 nanometer chains containing mesopores between SiO2 nanoparticles which are distributed in a three-dimensional net shape. The method includes the steps that separately prepared tetraethyl silicate ethanol solutions are dropwise added into a mixed aqueous solution and stirred for aging first, water and a mixed solution of ethanol and ethyl tetrasilicate are sequentially added into obtained SiO2 alkaline sol after an aqueous solution of nitric acid is added dropwise into the SiO2 alkaline sol, stirring is carried out to obtain acid-base composite sol, and then polyethylene glycol 300 is added into the acid-base composite sol and stirred for aging; the substrate is placed in the obtained sol for film coating and then subjected to immersing, pulling, film coating and air-drying, and then an obtained film-coated substrate is subjected to annealing to obtain a target product. The nanometer coating has good hydrophilicity and wear resistance and high light transmission performance and is extremely likely to be commercially used in the fields of fog resistance, automatic cleaning, wide-spectrum reflection enhancement and the like in a wide range.

Description

technical field [0001] The present invention relates to a kind of porous coating and preparation method, especially a kind of SiO with porous structure 2 Acid-base composite nano-coating and preparation method thereof. Background technique [0002] SiO with good hydrophilicity and wear resistance and high light transmission 2 , is often used to prepare a variety of functional coatings to achieve super-hydrophilic, anti-fog, self-cleaning, anti-reflection and other effects. Based on functional SiO 2 The preparation of the coating mostly adopts the sol-gel method; among them, according to the different catalysts used, it can be divided into an acid-catalyzed membrane with a dense structure and an alkali-catalyzed membrane with a loose particle structure. At present, in order to obtain SiO which is not only wear-resistant, but also has the advantages of good light transmittance and superhydrophilicity, 2 Coatings, various efforts have been made, such as the titled "Preparat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/00C03C17/23
CPCC03C17/009C03C17/23
Inventor 许少辉费广涛魏永帅苑利钢陈国
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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