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Super-hydrophilic self-cleaning SiO2 antifogging coating and preparation method thereof

An anti-fog coating and self-cleaning technology, applied in the direction of silicon dioxide, silicon oxide, etc., can solve the problems of high energy consumption, many components, poor wear resistance and heat resistance of glass products, and achieve simple equipment and equipment. Effect

Inactive Publication Date: 2009-09-23
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 evaporate water droplets by heating, and the timeliness is poor, and additional energy is required, and the energy consumption is large, 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 To improve the hydrophilicity of the surface of the substrate, it must be exposed to ultraviolet light to show good hydrophilicity. It is difficult to achieve this effect in a dark environment, and it has no real meaning. 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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  • Super-hydrophilic self-cleaning SiO2 antifogging coating and preparation method thereof
  • Super-hydrophilic self-cleaning SiO2 antifogging coating and preparation method thereof
  • Super-hydrophilic self-cleaning SiO2 antifogging coating and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0053] Preparation of PS spherical nanoparticles with a particle size of about 500 nm: Add 100 mL of distilled water, 13 mL of styrene monomer, and 0.1 g of polyvinylpyrrolidone into a 250 mL three-necked flask, and stir at room temperature for 15 minutes. Then dissolve 0.3g of initiator potassium persulfate in 20mL of distilled water, then pour it into the above-mentioned three-necked flask, pass through nitrogen for 30 minutes to remove the oxygen in the aqueous solution, then heat to 70°C and keep for 24 hours to obtain a particle size of about The white suspension of the PS spherical particle of 500nm, the scanning electron micrograph of the PS spherical particle of about 500nm particle diameter is as follows figure 1 as shown in a.

[0054] SiO with a particle size of about 50nm 2 Preparation of nanoparticles: Add 5mL of ammonia water and 100mL of absolute ethanol into the Erlenmeyer flask at room temperature and stir for 10 minutes, then stir at 60°C for 2 minutes, add ...

Embodiment 2

[0060] (PS / PDDA / PSS / PDDA / SiO obtained by embodiment 1 2 ) Ultrasonic dispersion of composite particles in distilled water to obtain a suspension with a mass fraction of 0.5% to 1.5%, and then adding this suspension to polydiallyldimethylammonium chloride with an excess volume concentration of 1 to 3 mg / mL In the aqueous solution, make the surface of the above product readsorb and electrostatically assemble a layer of polydiallyl dimethyl ammonium chloride, centrifuge, and ultrasonically wash the resulting solid product to remove the physically adsorbed polydiallyl dimethyl ammonium chloride , to obtain polydiallyldimethylammonium chloride coating, polystyrene sodium sulfonate coating, and polydiallyldimethylammonium chloride coating on the outside of polystyrene spherical nanoparticles. , solid SiO 2 Nanoparticle coating, polydiallyldimethylammonium chloride coating structure (PS / PDDA / PSS / PDDA / SiO 2 / PDDA), the composite particles are ultrasonically dispersed in distilled wa...

Embodiment 3

[0063] Preparation of super-hydrophilic anti-fog coating: use 98% H 2 SO 4 with a mass concentration of 30% H 2 o 2 The ordinary glass sheet is treated with the mixed solution with a volume ratio of 7:3, the treated glass sheet is washed with distilled water, dried with nitrogen, and the treated substrate is immersed in a PDDA solution with a concentration of 1-3mg / mL Take it out after 5 minutes, and deposit polydiallyldimethylammonium chloride coating on the glass surface, wash with distilled water to remove physically adsorbed PDDA, blow dry with nitrogen, and then immerse in a concentration of 1-3mg / mL Sodium polystyrene sulfonate (PSS) solution for 5 minutes, take it out, wash with distilled water, blow dry with nitrogen, and deposit a coating of sodium polystyrene sulfonate on the coating of polydiallyldimethylammonium chloride , and then continue to cross-repeat the above-mentioned process steps of depositing polydiallyl dimethyl ammonium chloride and depositing sodiu...

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Abstract

The invention belongs to the technical field of nano material preparation, and in particular relates to a super-hydrophilic self-cleaning SiO2 antifogging coating and a preparation method thereof. The super-hydrophilic self-cleaning SiO2 antifogging coating is prepared by layer-by-layer electrostatic assembly and dipcoating method through simple and cheap instruments and is expected to realize industrialization. The coating is formed by SiO2 hollow spheres, and the surface of the coating formed by the SiO2 hollow spheres has a hierarchical coarse structure and a hierarchical nanoscale porous structure; and the coating can be used on glass products, and is particularly suitable for various substrates requiring antifogging treatment in a damp air environment, particularly in showery days in the south of China.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to superhydrophilic 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...

Claims

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Application Information

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IPC IPC(8): C03C17/23C01B33/18
Inventor 贺军辉刘湘梅
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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