Self-cleaning coating composition, preparation method and application thereof
A composition and self-cleaning technology, applied in anti-corrosion coatings, anti-fouling/underwater coatings, coatings, etc., can solve the problem of not being able to balance light transmission, hydrophobicity and durability, good light transmission and hydrophobicity, etc. problems, to achieve the effect of controllable product structure, low shrinkage rate and simple synthesis process
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[0042] In a second aspect, the present invention provides a method for preparing a self-cleaning coating composition, wherein the method comprises:
[0043] (1) Mix butyl titanate, ethyl silicate and film-forming aid uniformly to obtain the first mixture;
[0044] (2) adding water and silica nanoparticles to the first mixture, and contacting the resulting mixture at 60-100°C to obtain a composite sol;
[0045] (3) adding a hydrophobic auxiliary agent to the composite sol, and contacting the resulting mixture at a temperature of 60-100° C. to obtain a hydrophobic composite sol.
[0046] According to the present invention, the dosage of the above components and the selection of silica nanoparticles, film-forming aids and hydrophobic aids have been described in the first aspect of the present invention, and will not be further described here.
[0047] According to the present invention, in step (2), the addition of water can trigger the hydrolysis of butyl titanate and ethyl sil...
Embodiment 1
[0070] This embodiment is used to illustrate the self-cleaning composition provided by the present invention and its preparation method
[0071] (1) Take 0.1mol tetraethyl orthosilicate (TEOS), 0.1mol silane coupling agent KH-560 (3-(2,3-epoxypropoxy)propyltrimethoxysilane), 0.1mol titanic acid Butyl ester (TBOT), 0.4mol anhydrous ethanol and 0.2g hydrochloric acid are thoroughly mixed evenly, and the silicon-titanium ratio is 1:1.
[0072] (2) Slowly add the deionized water of 0.2mol and the concentration of 0.4mol in terms of silicon dioxide as the fumed silica nanoparticle hydrosol of 10% by weight, the adding speed of deionized water is 0.05mL / s, and the gas phase two The addition speed of the silicon oxide nanoparticle hydrosol was 0.05mL / s, and the reflux reaction was carried out at 60° C. for 3 hours under stirring conditions to obtain a colorless and transparent organosilicon-titanium composite sol.
[0073] (3) Drop a mixture of 0.015 mol of PFDTES (heptadecylfluorod...
Embodiment 2
[0076] This embodiment is used to illustrate the self-cleaning composition provided by the present invention and its preparation method
[0077] (1) Take 0.1mol of tetraethyl orthosilicate (TEOS), 0.1mol of γ-aminopropyltriethoxysilane, 0.05mol of butyl titanate (TBOT), 0.4mol of anhydrous isopropanol and 0.2g of hydrochloric acid Mix well and the silicon-titanium ratio is 1:0.5.
[0078] (2) Slowly add 0.2mol of deionized water to the concentration of 0.4mol in silicon dioxide as the methanol sol of fumed silica nanoparticles of 5% by weight, the addition speed of deionized water is 0.02mL / s, and the gas phase The silica nanoparticle methanol sol was added at a rate of 0.1 mL / s, and refluxed at 70° C. for 2.5 h under stirring conditions to obtain a colorless, transparent organosilicon-titanium composite sol.
[0079] (3) Drop a mixture of 0.015 mol of heptadecafluorodecyltrimethoxysilane and 0.8 mol of anhydrous isopropanol into the above liquid at a rate of 0.5 mL / s, and co...
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