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Ultra-hydrophilic self-cleaning anti-fog coat and its preparation method and use

An anti-fog coating and self-cleaning technology, which is applied in the field of nanomaterial preparation, can solve the problems of high energy consumption, difficult to achieve, complicated devices, etc., and achieves the effects of simple equipment, good anti-fog performance, and simple preparation process.

Inactive Publication Date: 2008-04-30
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 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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  • Ultra-hydrophilic self-cleaning anti-fog coat and its preparation method and use
  • Ultra-hydrophilic self-cleaning anti-fog coat and its preparation method and use
  • Ultra-hydrophilic self-cleaning anti-fog coat and its preparation method and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of large spherical particles: Add 63.6mL pure water, 147.6mL absolute ethanol, and 9.0mL ammonia water into the Erlenmeyer flask, stir magnetically at room temperature for half an hour, then add 9.8mL tetraethyl orthosilicate (TEOS) dropwise under stirring Continue to stir at room temperature for 12-15 hours to obtain a white suspension, and the resulting SiO with a diameter of about 300-800nm 2 Transmission electron microscope pictures of spherical macroparticles are as follows figure 1 shown.

[0045] Preparation of spherical small particles: add 5mL ammonia water and 100mL absolute ethanol into the Erlenmeyer flask at room temperature and stir for 10 minutes, then stir for 2 minutes at 60°C, add 3mL tetraethyl orthosilicate (TEOS) dropwise under stirring, continue at 60°C After stirring for 12 hours, a translucent suspension was obtained, and the resulting SiO with a diameter of about 30-80 nm 2 Transmission electron microscope pictures of small spheric...

Embodiment 2

[0047] Assembly of spherical large and small particles: centrifuge the suspension of large particles with a diameter of about 300 to 800 nm prepared in Example 1, ultrasonically wash, and ultrasonically disperse in water to form a suspension with a mass fraction of 0.5% to 1.5%. The suspension was added to an equal volume of PDDA aqueous solution with a concentration of 1-3 mg / mL, magnetically stirred at room temperature for 5-8 hours, and passed through SiO 2 The negative charges on the surface of spherical macroparticles attract the positive charges of PDDA, making PDDA wrapped in SiO 2 On the surface of large spherical particles, centrifuge and ultrasonically wash to remove physically adsorbed polydiallyldimethylammonium chloride;

[0048] Then add the obtained product to an excess concentration of 1-3mg / mL sodium polyvinylbenzenesulfonate (PSS) aqueous solution, so that the surface of the above product is coated with a layer of sodium polystyrenesulfonate, centrifuged, and...

Embodiment 3

[0052] The preparation of super-hydrophilic anti-fog coating: put the ordinary glass flake with newly prepared Pirhana solution (mass concentration is 98% H 2 SO 4 with a mass concentration of 30% H 2 o 2According to the mixed liquid with a volume ratio of 7:3), the treated glass sheet was washed with distilled water, dried with nitrogen, immersed in a PDDA solution with a concentration of 1-3 mg / mL for 5 minutes, and then taken out, deposited on the glass surface Coated with polydiallyldimethylammonium chloride, washed with distilled water to remove physically adsorbed PDDA, dried with nitrogen, then immersed in PSS solution with a concentration of 1-3 mg / mL for 5 minutes, taken out, and washed with distilled water , blown dry with nitrogen, deposited on the polydiallyl dimethyl ammonium chloride coating with sodium polyvinyl benzene sulfonate coating, repeated the process steps of the above deposition 10 times, and finally deposited a layer of polydiallyl Base dimethyl am...

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Abstract

The invention relates to a super-hydrophilic self-clean anti-fog coat, process of preparation, and application, belonging to nanometer material preparation technical field. The inventive super-hydrophilic self-clean anti-fog coat is assembled by statistic and prepared by dip-coating method, with simple and cheap device, to support industrialization. The surface structure of the coat is similar with natural lotus leaf surface, and the coat is assembled from silicon dioxide composite particles similar as natural raspberry fruit structure. The coat can be used on glass product, especially on the substrates demanding anti-fog treatment in damp air condition, as southern rainy weather.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a superhydrophilic self-cleaning anti-fog coating and a preparation method and application thereof. 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 gla...

Claims

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Application Information

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