A kind of superhydrophobic self-cleaning coating and preparation method thereof

A self-cleaning coating and super-hydrophobic technology, applied in the direction of coating, etc., can solve the problems of complex preparation process, environmental pollution, high price, etc., and achieve the effect of wide application prospect, expanded application range, and simple preparation method

Active Publication Date: 2021-04-13
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, in the real environment, in addition to dust, organic pollutants will also adhere to the surface of the wall coating. General super-hydrophobic coatings cannot remove these organic pollutants. As the pollutants continue to accumulate, the surface of the coating will The superhydrophobic properties will gradually lose
In addition, the superhydrophobic coatings currently reported in the literature usually have complex and harsh preparation processes, making them difficult to apply on a large scale. Fluorine-containing organic compounds are often used for hydrophobic treatment of the coating surface, which is not only expensive, but also easily causes serious pollution to the environment. And other issues

Method used

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  • A kind of superhydrophobic self-cleaning coating and preparation method thereof
  • A kind of superhydrophobic self-cleaning coating and preparation method thereof
  • A kind of superhydrophobic self-cleaning coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A method for preparing a superhydrophobic self-cleaning coating, comprising the following steps:

[0039] (1) SiO 2 and TiO 2 Modification: SiO 2 and TiO 2 Put into two beakers respectively, SiO 2 and TiO 2 The mass ratio is 8:2; Add a small amount of distilled water to disperse it, then add sodium oleate and sodium stearate respectively in two beakers, the quality of adding sodium oleate and sodium stearate is respectively SiO 2 and TiO 2 1% by mass, stirred for 1h; where TiO 2 I am using P25;

[0040] (2) SiO 2 -TiO 2 Preparation of composite powder: the modified TiO 2 The suspension was added to the SiO 2 In the suspension, stir vigorously for 90min, wash with distilled water three times, dry at 105°C, and form SiO after grinding 2 -TiO 2 Composite powder;

[0041] (3) Modification of low surface energy substances: SiO 2 -TiO 2 Disperse the composite powder in absolute ethanol, add PDMS, stir for 1h to form SiO 2 -TiO 2 @PDMS slurry, where SiO 2 -T...

Embodiment 2

[0050] A method for preparing a superhydrophobic self-cleaning coating, comprising the following steps:

[0051] (1) SiO 2 and TiO 2 Modification: SiO 2 and TiO 2 Put into two beakers respectively, SiO 2 and TiO 2 The mass ratio of is 8:2; Make it disperse with a small amount of distilled water, then add sodium stearate in above-mentioned beaker, the quality of adding sodium stearate is SiO 2 and TiO 2 1% of mass, stir for 1h;

[0052] (2) SiO 2 -TiO 2 Preparation of composite powder: the modified TiO 2 The suspension was added to the SiO 2 In the suspension, stir vigorously for 90min, wash with distilled water three times, dry at 105°C, and form SiO after grinding 2 -TiO 2 Composite powder;

[0053] (3) Modification of low surface energy substances: SiO 2 -TiO 2 Disperse the composite powder in absolute ethanol, add PDMS, stir for 1h to form SiO 2 -TiO 2 @PDMS slurry. SiO 2 -TiO 2 The mass ratio of composite powder, absolute ethanol and PDMS is 4:20:1.

...

Embodiment 3

[0058] (1) SiO 2 and TiO 2 Modification: SiO 2 and TiO 2 Put into two beakers respectively, SiO 2 and TiO 2 The mass ratio of is 8:2; Make it disperse with a small amount of distilled water, then add sodium oleate respectively in above-mentioned beaker, the quality of adding sodium oleate is respectively SiO 2 and TiO 2 1% of mass, stir for 1h;

[0059] (2) SiO 2 -TiO 2 Preparation of composite powder: the modified TiO 2 The suspension was added to the SiO 2 In the suspension, stir vigorously for 90min, wash with distilled water three times, dry at 105°C, and form SiO after grinding 2 -TiO 2 Composite powder;

[0060] (3) Modification of low surface energy substances: SiO 2 -TiO 2 Disperse the composite powder in absolute ethanol, add PDMS, stir for 1h to form SiO 2 -TiO 2 @PDMS slurry. SiO 2 -TiO 2 The mass ratio of composite powder, absolute ethanol and PDMS is 4:20:1.

[0061] (4) Preparation of super-hydrophobic coating: the glass slide was ultrasonical...

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Abstract

The present invention generally belongs to the fields of new chemical materials and functional nanomaterials, and provides a superhydrophobic self-cleaning coating and a preparation method thereof. The coating includes SiO 2 and TiO 2 , polydimethylsiloxane (PDMS) and sodium oleate or sodium stearate, wherein the TiO 2 Coated on SiO in the form of nanoparticles 2 outer surface; the SiO 2 The particle size range is between 1‑10 μm; the TiO 2 The particle size range is between 20-30nm; SiO 2 and TiO 2 The mass ratio range is: 1:9~3:7; the quality of the sodium oleate or sodium stearate is SiO 2 and TiO 2 1% of the mass sum; the mass of the PDMS is SiO 2 -TiO 2 1 / 4 of the mass of the composite powder. The coating of the invention can be converted from high adhesion to low adhesion, and has photocatalysis and self-cleaning properties.

Description

technical field [0001] The invention generally belongs to the field of new chemical materials and functional nanometer materials, and in particular relates to a superhydrophobic self-cleaning coating and a preparation method thereof. Background technique [0002] There are many superhydrophobic biological phenomena in nature, the most representative two are "lotus leaf effect" and "rose petal effect". Both the surface of the lotus leaf and the surface of the rose petal have strong hydrophobicity, and the static contact angle is greater than 150°. The dust on its surface can be taken away to achieve the purpose of "self-cleaning". This phenomenon is called "lotus leaf effect"; while the surface of rose petals has strong adhesion to water droplets, even if the petals are turned upside down by 180° , the water droplets on its surface will not fall, this phenomenon is the "rose petal effect". [0003] Various super-wetting phenomena in nature have attracted extensive attention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D1/00C09D7/63
CPCC09D1/00C09D7/63
Inventor 王炫丁浩孙思佳汪杰张涵周润李洋子
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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