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sio with porous structure 2 Acid-base composite nano-coating and preparation method thereof

A porous structure and nano-coating technology, which is applied in the field of SiO2 acid-base composite nano-coating and its preparation, can solve the problems of poor anti-reflection effect, unsatisfactory hydrophilicity, and low porosity, and achieve optimal anti-reflection properties , high wear resistance, simple preparation method

Active Publication Date: 2021-08-31
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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  • sio with porous structure <sub>2</sub> Acid-base composite nano-coating and preparation method thereof
  • sio with porous structure <sub>2</sub> Acid-base composite nano-coating and preparation method thereof
  • sio with porous structure <sub>2</sub> Acid-base composite nano-coating and preparation method thereof

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Experimental program
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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 in sequen...

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 concentration of 67% nitric acid aqueous solution to the alkaline sol dropwise to make the pH value 1.5, then add water and a mixture of ethanol and ethyl tetrasilicate to it in tu...

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Abstract

The invention discloses a SiO with porous structure 2 Acid-base composite nano-coating and preparation method thereof. The coating is composed of a 150‑200nm thick multi-slit film on the substrate, in which the multi-slit film is composed of SiO2 distributed in a three-dimensional network 2 Nanoparticles interposed with SiO containing mesoporous 2 Nano chains are formed; the method is to drop the separately prepared ethyl tetrasilicate ethanol solution into the mixed aqueous solution drop by drop, then stir and age, and then add the obtained SiO 2 After adding nitric acid aqueous solution dropwise to the alkaline sol, add water, ethanol and ethyl tetrasilicate mixture to it in turn, after stirring to obtain an acid-base composite sol, then add polyethylene glycol 300 to it first and stir for aging Finally, the substrate is placed in the obtained sol for coating, dipped to pull the coating, and then dried, and then annealed the obtained substrate coated with a film to obtain the target product. It has good hydrophilicity, wear resistance and high light transmittance, and it is very easy to be widely commercialized and used in anti-fog, self-cleaning, wide-spectrum anti-reflection and other fields.

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 Patents(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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