Transparent self-cleaning SiO2 anti-fogging coating and preparation method thereof

An anti-fogging coating and self-cleaning technology, applied in the field of transparent self-cleaning SiO2 anti-fogging coating and its preparation, can solve the problems of many components, limited scope of application, difficult to achieve, etc.

Active Publication Date: 2012-01-11
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have their own limitations: method (1) needs to repeatedly spray surface-active agent on a regular basis and seems inconvenient; method (2) causes glass products to have poor abrasion resistance and heat resistance due to the use of organic substances; method ( In 3), it usually takes 7 to 10 minutes to heat and evaporate water droplets, and the timeliness is poor, and additional energy is required, which consumes a lot of energy, so it is not practical; the device of method (4) is more complicated, has many components, and the cost is high (Liu Fu Shengcong, Li Yuping National Scientific and technological journal of building materials - "Glass" 2002, No. 3, 16-19)
Unfortunately the technology uses TiO 2 The photocatalytic properties to improve the hydrophilicity of the surface of the substrate must show good hydrophilicity in an environment irradiated by ultraviolet light. It is difficult to achieve this effect in a dark environment, and it has not achieved true Significantly superhydrophilic (contact angle less than 5 degrees), thus limiting its scope of application
In general, the self-cleaning and anti-fog effects and durability of these current technologies are not ideal

Method used

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  • Transparent self-cleaning SiO2 anti-fogging coating and preparation method thereof
  • Transparent self-cleaning SiO2 anti-fogging coating and preparation method thereof
  • Transparent self-cleaning SiO2 anti-fogging coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Hierarchical mesoporous SiO 2 Preparation of nanoparticles:

[0061] (1) Dissolve 0.3-0.7 g of cetyltrimethylammonium bromide in 50-100 ml of distilled water (conductivity 18.2 MΩ) at 20-25 degrees Celsius, and stir for 10-30 minutes to form a homogeneous solution;

[0062] (2) the ammoniacal liquor (the mass percent composition of ammonia is 25%) of 0.6~1 milliliter respectively, the dehydrated alcohol of 5~25 milliliters and the ether of 10~30 milliliters join in the solution that step (1) obtains, in At a magnetic stirring speed of 600-1500 rpm, stir for 2-10 minutes, and form a transparent and colorless emulsion in 10-30 minutes;

[0063] (3) Add 1.5-3 ml of tetraethoxysilane (purity not less than 99.9%) to the transparent colorless emulsion obtained in step (2), seal and keep stirring for 3-8 hours;

[0064] (4) filtering the solid precipitate obtained by the reaction in step (3), washing with water, and drying in an oven at a temperature of 60 to 80 degrees Cels...

Embodiment 2

[0069] A layer of mesoporous SiO 2 Superhydrophilic and transparent self-cleaning SiO with rough structure on the surface composed of nanoparticles 2 Preparation of anti-fog coating: using the SiO with hierarchical mesoporous structure prepared in Example 1 with a mass percentage of 0.2-0.6% 2 Nano particle suspension is used as raw material, and its preparation method comprises the following steps:

[0070] (1) the glass piece is immersed in the newly prepared Pirhana solution (mass concentration is about 98% H 2 SO 4solution with a mass concentration of approximately 30% H 2 o 2 The mixture of solutions, where, H 2 SO 4 solution with H 2 o 2 The volume ratio of the solution is 7: 3), after soaking for 5 to 20 minutes, take out and wash with distilled water, and blow dry with nitrogen;

[0071] (2) Immerse the glass sheet dried with an inert gas in step (1) into an aqueous solution of polydiallyldimethylammonium chloride with a concentration of 1 to 3 mg / mL for 2 to ...

Embodiment 3

[0077] Two-layer hierarchical mesoporous SiO 2 Superhydrophilic and transparent self-cleaning SiO with rough structure on the surface composed of nanoparticles 2 Preparation of anti-fog coating: using SiO with hierarchical mesoporous structure prepared in Example 1 with a mass percentage of 0.2-0.6% 2 Nano particle suspension is used as raw material, and its preparation method comprises the following steps:

[0078] (1) the glass piece is immersed in the newly prepared Pirhana solution (mass concentration is about 98% H 2 SO 4 solution with a mass concentration of approximately 30% H 2 o 2 The mixture of solutions, where, H 2 SO 4 solution with H 2 o 2 The volume ratio of the solution is 7: 3), after soaking for 5 to 20 minutes, take out and wash with distilled water, and blow dry with nitrogen;

[0079] (2) Immerse the glass sheet dried with an inert gas in step (1) into an aqueous solution of polydiallyldimethylammonium chloride with a concentration of 1 to 3 mg / mL ...

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Abstract

The invention belongs to the technical field of nano materials, and relates to a transparent self-cleaning SiO2 anti-fogging coating and a preparation method thereof. A static self-assembly method is adopted, and hierarchical mesoporous SiO2 nanoparticles and polyelectrolyte are alternately assembled to form the super hydrophilic or hydrophobic transparent self-cleaning SiO2 anti-fogging coating.The coating consisting of the hierarchical mesoporous SiO2 nanoparticles has a hierarchical porous structure and a hierarchical rough structure on the surface; and the hierarchical mesopores of the hierarchical mesoporous SiO2 nanoparticles are positioned on the surfaces of the hierarchical mesoporous SiO2 nanoparticles, and comprise 2-5nm mesopores enclosed by amorphous silicon dioxide frameworkstructures and 5-30nm mesopores enclosed by amorphous silicon dioxide framework structures. Because of the hierarchical mesopores of the hierarchical mesoporous SiO2 nanoparticles and pores among thehierarchical mesopores, the transmittance of a glass plate coated with the hierarchical mesoporous SiO2 nanoparticles is improved from 90.4 percent to 92.0 percent.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to transparent self-cleaning SiO 2 Anti-fog coating and its preparation method. Background technique [0002] Self-cleaning glass (Self-cleaning glass) refers to the special physical or chemical treatment of ordinary glass, which produces unique physical and chemical properties on the surface, so that the glass can achieve cleaning effect without traditional manual scrubbing methods. Glass. [0003] Glass fogging refers to the condensation of moisture or steam on the surface of glass products to form tiny water droplets. Anti-fogging glass refers to the special treatment of ordinary glass to make the surface super-hydrophilic, so that the tiny water droplets formed due to atomization can be quickly flattened, so as not to affect mirror imaging, visibility and The effect of light transmittance of glass. [0004] Self-cleaning glass is mainly divided into two cate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/23
Inventor 贺军辉杜鑫
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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