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Surface-hydroxylation mesoporous SiO2-TiO compound self-cleaning coating layer and preparation method thereof

A self-cleaning coating and hydroxylated mesoporous technology, which can be used in coatings, antifouling/underwater coatings, paints containing biocides, etc., can solve the problems of limited active sites and constraints on the application prospects of TiO's hydrophilic properties. Achieve the effects of low preparation cost, high bonding strength and gripping force, and high transparency

Active Publication Date: 2018-03-30
哈尔滨新干线轨道交通科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But TiO 2 The hydrophilic properties of TiO depend on the irradiation of ultraviolet light. After the light is stopped, the chemisorbed hydroxyl groups are replaced by oxygen in the air and return to the hydrophobic state, and pure TiO 2 The limited active sites exposed on the surface constrain the TiO 2 Application prospects of hydrophilic properties

Method used

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  • Surface-hydroxylation mesoporous SiO2-TiO compound self-cleaning coating layer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A surface hydroxylated mesoporous SiO provided by the invention 2 -TiO 2 The steps of the preparation method of the composite self-cleaning coating are as follows:

[0029] Step 1: Dissolve 0.06-0.08g of CTAB colloidal particles in a mixed solution of 32-37mL deionized water and 14-16mL of absolute ethanol, add 0.5-2.0mL tetraethyl orthosilicate to the above-mentioned mixed solution and dissolve it with 100-300r / min speed stirring for 10~30min to prepare SiO 2 Sol;

[0030] Step 2: Add 10-12mL tetrabutyl titanate to a mixed solution of 0.9-1.1mL acetylacetone and 34-36mL absolute ethanol to prepare TiO 2 Sol;

[0031] Step 3: Place the clean and dry substrate on the SiO prepared in step 1 2sol, and stand at 60-70°C for 19-21 hours to obtain a layer of SiO attached to the surface 2 sol substrate and calcined it at 530-580°C for 3-3.5 hours to remove CTAB, and what is attached to the surface of the substrate after calcination is the prepared mesoporous SiO 2 thin ...

Embodiment 2

[0037] A surface hydroxylated mesoporous SiO provided by the invention 2 -TiO 2 The steps of the preparation method of the composite self-cleaning coating are as follows:

[0038] Step 1: Dissolve 0.06-0.08g of CTAB colloidal particles in a mixed solution of 32-37mL deionized water and 14-16mL of absolute ethanol, add 0.5-2.0mL tetraethyl orthosilicate to the above-mentioned mixed solution and dissolve it with 100-300r / min Stirring speed and stir for 10-30min to prepare SiO 2 Sol;

[0039] Step 2: Add 10-12mL tetrabutyl titanate to a mixed solution of 0.9-1.1mL acetylacetone and 34-36mL absolute ethanol, add 1-2 drops of dilute hydrochloric acid to the mixed solution and stir evenly to obtain TiO 2 Sol;

[0040] Step 3: Put the clean and dry quartz glass as the substrate on the SiO prepared in step 1 2 sol, and stand at 60-70°C for 19-21 hours to obtain a layer of SiO attached to the surface 2 sol quartz glass substrate and calcined it at 530-580°C for 3-3.5 hours to re...

Embodiment 3

[0046] A surface hydroxylated mesoporous SiO provided by the invention 2 -TiO 2 The steps of the preparation method of the composite self-cleaning coating are as follows:

[0047] Step 1: Dissolve 0.08g of CTAB colloidal particles in a mixed solution of 35mL deionized water and 15mL absolute ethanol, add 1.5mL tetraethyl orthosilicate to the above mixed solution and stir at a stirring speed of 200r / min for 20min to prepare SiO 2 Sol;

[0048] Step 2: Add 10mL tetrabutyl titanate to a mixed solution of 1mL acetylacetone and 35mL absolute ethanol to prepare TiO 2 Sol;

[0049] Step 3: Put the clean and dry quartz glass as the substrate on the SiO prepared in step 1 2 sol, and stood at 60°C for 20h to obtain a layer of SiO attached to the surface 2 sol quartz glass substrate and calcined it at 550°C for 3h to remove CTAB, the mesoporous SiO2 adhered to the surface of the quartz glass substrate after calcination 2 thin film, the mesoporous SiO 2 The film thickness is 0.5μm;...

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Abstract

The invention belongs to the technical field of self-cleaning coating layers and specifically relates to a surface-hydroxylation mesoporous SiO2-TiO compound self-cleaning coating layer and a preparation method thereof. The preparation method disclosed by the invention comprises the steps: firstly, respectively preparing SiO2 sol and TiO2 sol; then roasting to obtain a mesoporous SiO2 film and utilizing a dipping-pulling method to cover a layer of TiO2 on the surface of the mesoporous SiO2 film and roasting to prepare a mesoporous SiO2-TiO2 compound coating layer; finally, performing hydrogenperoxide hydroxylation treatment to prepare the surface-hydroxylation mesoporous SiO2-TiO2 compound self-cleaning coating layer. According to the preparation method disclosed by the invention, the hydroxylation treatment on the surface of the self-cleaning coating layer makes surface polarity of the compound self-cleaning coating layer be enhanced and surface hydrophilicity be improved; mesoporesare introduced into, so that the surface roughness of the coating layer is increased to enhance the surface hydrophilicity of the coating layer; meanwhile, more TiO2 active sites are exposed, so thatsurface wettability of the compound self-cleaning coating layer disclosed by the invention is obviously improved, and the compound self-cleaning coating layer can still has good hydrophilic property under the situation without ultraviolet irradiation.

Description

technical field [0001] The invention belongs to the technical field of self-cleaning coatings, in particular to a surface hydroxylated mesoporous SiO 2 -TiO 2 Composite self-cleaning coating and preparation method thereof. Background technique [0002] With the aggravation of global environmental pollution, the surface contamination of architectural glass, automotive glass and photovoltaic glass is becoming more and more serious, and the development of glass with high-efficiency self-cleaning ability has become an important way to solve this problem. The self-cleaning coating can make the pollutants or dust particles on the glass surface fall off automatically under the action of gravity, rain, wind and other external forces or be removed through photocatalytic degradation. It has the advantages of water saving, energy saving and environmental protection. and other industries have important application prospects. Currently, two types of self-cleaning coatings have been de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D5/16
CPCC09D1/00C09D5/1618C09D5/1681
Inventor 姜久兴
Owner 哈尔滨新干线轨道交通科技有限公司
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