Formula based on modified hydrophobic SiO2 (silicon dioxide) self-cleaning paint and preparation method thereof

A self-cleaning and modified technology, applied in the direction of coating, etc., can solve the problem of unsatisfactory silica effect, and achieve the effect of promoting and improving the hydrophobic effect

Active Publication Date: 2013-08-21
HUAIAN PAINT MFG FACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It uses different types of fumed silica or precipitated silica as raw materials, and reacts with suitable compounds through silane groups: for example, Degussa AEROSIL R972 is obtained through the reaction of silane groups with dimethyldichlorosilane , this product is hydrophobic due to the non-hydrolyzable methyl groups attached to the surface, but the group-modified hydrophobic SiO 2 , after it is added to the polymer resin system, due to the polarity difference between the organic-inorganic phase and the cluster effect of the nanoparticles, the effect of adding hydrophobic silica is not ideal, and it needs to be ultrasonically dispersed to achieve effective dispersion.

Method used

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  • Formula based on modified hydrophobic SiO2 (silicon dioxide) self-cleaning paint and preparation method thereof

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preparation example Construction

[0031] The preparation method of the present invention comprises the following processing steps:

[0032] A), according to the above components and their mass percentages, dissolve the fluorosilicone resin in an aromatic hydrocarbon ester mixed solvent, and stir at a speed of 200 rpm to 1000 rpm for 5 to 30 minutes;

[0033] B), coating modified SiO with hydroxyl-terminated polydimethylsiloxane 2 Add to the solution prepared in step A, and stir at a speed of 2500-3000 rpm for 20-60 minutes until the dispersion is uniform;

[0034] C), during construction, add curing agent to the mixed solution prepared in step B, the relative mass ratio range of curing agent to the mixed solution prepared in step B is 0.4:100~0.72:100, after stirring evenly, pass Apply to the surface of the substrate by brushing, spraying, etc., and cure at room temperature to form a cross-linked film.

[0035] The aromatic hydrocarbon ester mixed solvent is a mixed solvent in which xylene and butyl acetate ...

Embodiment 1

[0038] Composed of the following components and their mass percentages: 25% fluorosilicone resin, hydroxyl-terminated polydimethylsiloxane coated modified nano-SiO 2 30%, xylene, butyl acetate mixed solvent 45% in a ratio of 1:1, also including polyisocyanate.

[0039] Add polyisocyanate during construction, and the relative mass ratio range of polyisocyanate to the above components is 0.4:100.

[0040] First, gas-phase SiO 2 The powder is dispersed in the xylene solution, the concentration of the powder relative to the solution is 0.01g / m3, first stirred at 2500 rpm for 60 minutes, then ultrasonically dispersed for 10 minutes until the dispersion is uniform, and then 80000mPa·s of hydroxyl sealant is added Terminated polydimethylsiloxane, which with gas-phase SiO 2 The mass ratio is 1:10. After mixing and stirring evenly, dibutyltin dilaurate is added as a catalyst. 20.1% of the total mass, mixed and stirred, heated to 80°C, and the reaction time was controlled at 0.5 hour...

Embodiment 2

[0044] It consists of the following components and their mass percentages: 45% fluorosilicone resin, hydroxyl-terminated polydimethylsiloxane coated modified nano-SiO 2 25%, xylene, butyl acetate mixed solvent 30% in a ratio of 1:1, also including polyisocyanate.

[0045] Add polyisocyanate during construction, and the relative mass ratio range of polyisocyanate to the above components is 0.72:100.

[0046] First, gas-phase SiO 2 The powder is dispersed in the xylene solution, the concentration of the powder relative to the solution is 0.1g / m, first stirred at 2800 rpm for 45 minutes, then ultrasonically dispersed for 20 minutes, until the dispersion is uniform, and then 5000mPa·s hydroxyl end capping is added Polydimethylsiloxane, which with gas-phase SiO 2 The mass ratio is 1:1. After mixing and stirring evenly, dibutyltin dilaurate is added as a catalyst. 2 1% of the total mass. Mix and stir, heat up to 70°C, and control the reaction time at 5 hours. The obtained produ...

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Abstract

The invention discloses a formula based on modified hydrophobic SiO2 (silicon dioxide) self-cleaning paint. The formula is characterized by comprising the following components by weight percent: 25 to 45 percent of fluorosilicone resin, 15 to 30 percent of hydroxyl-terminated dimethyl siloxane-coated modified nano SiO2 and 30 to 55 percent of aromatic ester mixed solvent, and the formula also comprises a curing agent, and the relative mass ratio range of the curing agent and the components is (0.4:100)-(0.72:100). The hydroxyl-terminated dimethyl siloxane is used for coating and modifying the nano gas-phase SiO2, so that the hydrophobic property is improved; and meanwhile, due to the cladding and modification of the macromolecule polymer, the clustering phenomenon caused by the doping of the nano SiO2 in the polymer can be inhibited, the dispersing efficiency of the nano SiO2 can be improved, and the hydrophobic property of the surface of a paint film can be promoted.

Description

technical field [0001] The invention relates to the technical field of self-cleaning coatings, in particular to a modified hydrophobic SiO 2 Formulation of self-cleaning coating and method for its preparation. Background technique [0002] Since the concept of "self-cleaning" was put forward in the 1990s, its research and commercialization have developed rapidly. One of the important research directions of "self-cleaning coatings" is to learn from the biohydrophobic mechanism, such as the perfect hydrophobic self-cleaning function on the surface of lotus leaves. Barthlott W, a professor of botany at the University of Bonn in Germany, found that there are nano-wax crystals on the surface of lotus leaves. This special structure makes the surface of lotus leaves almost non-wettable by water. The particle size is generally larger than wax crystals, so the pollutants will loosely attach to the protruding part of the mastoid, and the pollutants will be easily taken away when the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/08C09D7/12C09D5/00C08G83/00
Inventor 李为立于干
Owner HUAIAN PAINT MFG FACTORY
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