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Anti-reflection super-hydrophobic self-cleaning SiO2 nano coating

A technology of anti-reflection and anti-reflection, nano-coating, applied in the direction of coating, etc., can solve the problem of poor wear resistance and heat resistance of glass products, high energy consumption, self-cleaning and anti-fog effects and unsatisfactory durability, etc. problem, to achieve the effect of good superhydrophobic self-cleaning performance, simple equipment and excellent superhydrophobic self-cleaning performance

Active Publication Date: 2016-05-11
UNIV OF SCI & TECH BEIJING
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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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  • Anti-reflection super-hydrophobic self-cleaning SiO2 nano coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Small and non-porous SiO with a particle size of 10 to 25 nm 2 Preparation of nanoparticles:

[0042] (1) Add 100 milliliters of ethanol and 4 to 6 milliliters of ammonia water into a 250 milliliter round bottom flask, and stir in a water bath at 40 to 60 degrees Celsius;

[0043](2) After the temperature is constant, add 2 to 5 milliliters of tetraethoxysilane into the mixed solution, and continue to stir for 12 hours to obtain the small and non-porous SiO 2 particle.

[0044] Take a small amount of sample and disperse it in ethanol, spot the sample on the copper grid of the scanning table and the transmission electron microscope, then observe with the scanning electron microscope and the transmission electron microscope, as figure 1 a, 1b shown. figure 1 a and figure 1 b are small-sized and non-porous SiO, respectively 2 Scanning electron micrographs and transmission electron micrographs of nanoparticles. figure 1 a shows that the obtained small-sized and non-po...

Embodiment 2

[0047] SiO with a dendritic hierarchical pore structure 2 Particle preparation:

[0048] (1) At 20 degrees Celsius, dissolve 0.5 gram of cetyltrimethylammonium bromide in 70 milliliters of distilled water, then add 15 milliliters of ether, 5 milliliters of ethanol, and 0.8 milliliters of 30% ammonia solution , forming an emulsion system;

[0049] (2) After the emulsion obtained in step (1) was stirred vigorously for 30 minutes at 20 degrees Celsius, a mixture of 2.5 milliliters of tetraethoxysilane and 0.1 milliliters of aminopropyltriethoxysilane was quickly added to the emulsion, The final mixture was vigorously stirred and reacted at 20 degrees Celsius for 4 hours, and then 1 ml of 37% hydrochloric acid solution was added to terminate the reaction;

[0050] (3) centrifuging the white precipitate obtained by step (2) reaction, washing, and dispersing in the ethanol solution;

[0051] (4) Ultrasonic dispersion of the product of step (3) dispersed into ethanol solution;

...

Embodiment 3

[0059] The bottom layer is made of small size and non-porous SiO 2 Anti-reflection and anti-reflection coating constructed of nanoparticles: Its preparation is to use the small-sized and non-porous SiO with a mass percentage of 0.1 to 6% and a particle size of 10 to 25 nm obtained in Example 1. 2 The ethanol suspension of nanoparticle is used as raw material, and its preparation method comprises the following steps:

[0060] (1) ultrasonically washing the glass sheet in ultrapure water for 5 to 30 minutes and treating it with oxygen plasma for 1 to 20 minutes;

[0061] (2) Put the glass sheet cleaned in step (1) on a small-sized and non-porous SiO 2 Pull the nanoparticle ethanol suspension 1, 2, 3, 4, 5 times respectively, the pulling speed is 20-200 mm / min, soak in the suspension for 5-50 seconds, and stand in the room after pulling out each time 5-60 seconds.

[0062] Figure 4 It shows that the blank glass and Example 3 are deposited on the glass sheet with 1, 2, 3, 4, ...

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Abstract

The invention belongs to the field of nano material preparation technology and application, and particularly relates to designing of an anti-reflection super-hydrophobic self-cleaning SiO2 nano coating and a preparation method and application of the anti-reflection super-hydrophobic self-cleaning SiO2 nano coating. The nano coating is prepared through a Czochralski method, needed instruments are simple, low in cost and automatic, and the nano coating can be prepared on a large scale and is easy for industrialization. The nano coating is composed of a bilayer nanoparticle system, the first layer is an anti-reflection coating built by small-size solid SiO2 particles, the second layer is a super-hydrophobic coating built by utilizing dendritic SiO2 nanoparticles, and the dendritic particles have hierarchical coarse structures and multiscale duct structures. The nano coating is applied to glass products, highest light transmittance can reach 96.2% which is a great increase than the light transmittance of 90.4% of original glass substrates, lowest light reflectivity can reach 2.4% which is a great decrease than the light reflectivity of 8% of the original glass substrates, and the nano coating has good super-hydrophobic self-cleaning performance.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, in particular to dendritic mesoporous SiO 2 Anti-reflection and anti-reflection superhydrophobic self-cleaning SiO prepared from particles 2 Nanocoating and its preparation method. The coating is composed of a double-layer nanoparticle system, and the bottom layer is made of small-sized solid SiO with a particle size of 10-25nm. 2 The anti-reflection and anti-reflection coating constructed of nanoparticles, the upper layer is made of dendritic SiO with a particle size of 60-280nm 2 Particle-structured superhydrophobic coating. Background technique [0002] Self-cleaning glass (Self-cleaning glass) refers to the glass that is treated with special physical or chemical methods to produce unique physical and chemical properties on the surface, so that the glass can achieve cleaning effect without traditional manual scrubbing methods. . Glass fogging refers to the condensation of...

Claims

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Application Information

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IPC IPC(8): C03C17/23
CPCC03C17/006C03C17/23C03C2217/213C03C2217/42C03C2217/732C03C2218/111C03C2218/32
Inventor 杜鑫邢义
Owner UNIV OF SCI & TECH BEIJING
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