Hydrophobic SiO2 nano mixed liquor, functional coating and preparation

A mixed liquid and nanotechnology, applied in the field of nanomaterials, can solve the problems of time-consuming and labor-intensive, self-cleaning, anti-fog effect, durability and convenience, and increased cost.

Active Publication Date: 2019-10-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These methods are often time-consuming and labor-intensive, increasing costs
[0007] In general, the ...

Method used

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  • Hydrophobic SiO2 nano mixed liquor, functional coating and preparation
  • Hydrophobic SiO2 nano mixed liquor, functional coating and preparation
  • Hydrophobic SiO2 nano mixed liquor, functional coating and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Preparation of hydrophobic SiO 2 Nanoparticle suspension:

[0073] Stir and mix 50mL ethanol and 1.25mL concentrated ammonia water in a water bath at about 60°C; after the temperature is constant, add 1.5mL tetraethoxysilane to the above mixed solution, and continue to stir for 12 hours. SiO modified with superhydrophobic groups 2 Nanoparticles. Add 0.5 mL of 1H, 1H, 2H, 2H-perfluorooctyltriethoxysilane to the above mixed solution, stir again for 24 hours, then place the reaction product in a fume hood to remove ammonia until the pH of the product reaches 7.0- 7.5, to obtain hydrophobic SiO modified by organofluorine functional groups 2 The nanoparticle suspension was then diluted to three times the original volume with ethanol, in which the hydrophobic SiO 2 The content of nanoparticles is about 12.9mg / mL, which can be sealed and stored at room temperature.

[0074] figure 1 a is the SiO of the unmodified hydrophobic group prepared above 2 Transmission electron ...

Embodiment 2

[0076] Preparation of nano-SiO 2 Acid sol:

[0077] At room temperature (25°C), add a certain amount of concentrated hydrochloric acid to deionized water to prepare dilute hydrochloric acid with a concentration of 1-5 mg / mL; then, add 4.52 mL of dilute hydrochloric acid solution to 135 mL of ethanol, stir and mix Evenly, the final concentration of hydrochloric acid is 0.032-0.16mg / mL.

[0078]14mL tetraethoxysilane was added in the above-mentioned mixed solution, after stirring and reacting at room temperature for 4 hours, then left to stand at room temperature and reacted for 4 days to obtain nano-SiO 2 Acidic sol, in which chain-like nano-SiO 2 The content is about 84.8mg / mL and can be stored at 4°C.

[0079] The solid-state nuclear magnetic resonance was used to detect, and the results showed that the above-prepared nano-SiO 2 The condensation degree of the acidic sol is about 80%.

[0080] image 3 For the above prepared nano-SiO 2 Digital photograph of an acidic so...

Embodiment 3-1

[0082] Hydrophobic SiO 2 Preparation of nanomixture:

[0083] Under stirring condition, to the hydrophobic SiO prepared in 35mL embodiment 1 2 Slowly add the nano-SiO prepared by 0.6mL embodiment 2 in the nanoparticle suspension 2 Acidic sol; stir for 3-10 minutes to obtain hydrophobic SiO 2 Nanomixture.

[0084] Figure 4 a is the hydrophobic SiO prepared above 2 Transmission map of the nanohybrid solution. Cross-linked silica nanoparticles form a three-dimensional network structure, and nano-SiO 2 The chain-like substance forms a small amount of floc, which appears in the middle of the network structure, and acts like glue to increase the degree of adhesion between particles and between particles and the substrate, increasing the firmness of the coating. Figure 4 b is the hydrophobic SiO prepared above 2 Digital photo of the nanomixture. It can be seen from 4b that SiO 2 The nanomixture is a clear and transparent solution.

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Abstract

The invention relates to a hydrophobic SiO2 nano mixed liquor, a functional coating and preparation. The hydrophobic SiO2 nano mixed liquor is formed by compounding a hydrophobic SiO2 nano particle suspension modified by an organic fluorine functional group and a nano-SiO2 acid sol; the average particle size of the hydrophobic SiO2 nano particles in the hydrophobic SiO2 nano particle suspension is10nm, and the particle surfaces are modified by the organic fluorine functional group; the nano-SiO2 acid sol has chain-shapednano-SiO2, and the condensation degree of the nano-SiO2 acid sol is 70-90%. The functional coating prepared on the glass surface by using SiO2 nano mixed liquor has the good anti-reflection performance (the light transmittance is greater than 96%) and the superhydrophobicperformance (the contact angle is greater than 150 degrees), and the properties of superhydrophobic self-cleaning, antifogging, oil stain prevention and the like can be achieved; the coating has goodmechanical wear resistance, and is firmly combined with the substrate, using is not limited, the coating can be used for playing a role for a long time outdoor, and the range of application is wide.

Description

technical field [0001] The invention relates to the technical field of nanomaterials, in particular to a hydrophobic SiO 2 Nano-mixture, functional coating and preparation. Background technique [0002] Multifunctional glass is glass with multiple functions such as anti-reflection and anti-reflection, self-cleaning performance, high mechanical strength and good weather resistance. Due to its superior composite performance, it can be widely used in many fields such as life, industry, aerospace industry, etc., especially for the glass exterior walls of high-rise buildings and solar cells that require long-term outdoor work. With the development of science and technology, the demand for research and development of multifunctional glass with high mechanical strength is very urgent, and the preparation method of multifunctional glass is required to have the characteristics of simple, easy to obtain raw materials, low cost, controllable scale and industrialization. [0003] Anti...

Claims

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Application Information

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IPC IPC(8): C09D1/00C03C17/25
CPCC03C17/006C03C17/25C03C2217/213C03C2217/42C03C2217/70C03C2217/732C03C2217/78C03C2218/111C09D1/00
Inventor 杜鑫奚如冰
Owner UNIV OF SCI & TECH BEIJING
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