Preparation and application of fluorine-free transparent self-cleaning coating capable of being cured at normal temperature
A room temperature curing and self-cleaning technology, applied in coatings and other directions, can solve the problems of inapplicability, avoid the use of expensive and harmful fluorine-containing substances, make the preparation simple and fast, and maintain stable functions
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[0026] A preparation method of a fluorine-free transparent self-cleaning coating that can be cured at room temperature, comprising the following steps:
[0027] 1) Ultrasonically disperse fumed silica into an alcohol solvent, the concentration of silica is 1.0-10.0 mg / mL, the ultrasonic time is 5-10 min, and the concentration is added drop by drop under the condition of rotating speed of 600-1200 r / min. Add 15-20% titanium trichloride aqueous solution to the above dispersion liquid, then add 0.1-1.0 mL of 3 M hydrochloric acid dropwise, and react at room temperature to 70 °C for 6~30 h, after the reaction, add dropwise fluorine-free organic The silicon modifier was reacted for 5-18 hours, and the fluorine-free self-cleaning coating was obtained after the reaction.
[0028] 2) Spray the fluorine-free self-cleaning paint obtained in step 1) on the surface of fabrics, walls and other substrates. The angle of the spray gun is 70-90 degrees from the surface of the workpiece. The di...
Embodiment 1
[0036] 1) Preparation of sol suspension
[0037] Take 0.1 g SiO 2 Ultrasonic dispersion in 50 mL ethanol, the ultrasonic time is 10 min, and 0.5 mL ferric chloride aqueous solution is added dropwise at a speed of 800 r / min, followed by 0.2 mL of 3M hydrochloric acid solution after the dropwise addition, at 60 °C The reaction was carried out in a water bath for 20 h. After the reaction was completed, the dispersion liquid loaded with titanium dioxide nanoparticles with high photocatalytic activity was obtained after cooling to room temperature. Finally, 1.0 mL of dimethyldiethoxysilane was added dropwise to the dispersion for hydrophobic modification, and after 12 hours of reaction, a highly dispersible fluorine-free self-cleaning coating was obtained.
[0038] Coating preparation
[0039] The obtained fluorine-free self-cleaning paint is respectively applied to the surfaces of different substrates by means of spraying or dipping. When using the spraying process, the angle o...
Embodiment 2
[0041] 1) Preparation of self-cleaning coating
[0042] Take 0.25 g SiO 2 Ultrasonic disperse in 80 mL ethanol, ultrasonic time is 20 min, add 1.0 mL ferric chloride aqueous solution drop by drop at the speed of 1000 r / min, then add 0.5 mL 3M hydrochloric acid solution, heat up to 60 °C in a water bath , reacted for 20 h. After the reaction, cool to room temperature. Add 1.0 mL of diethoxydimethylsilane and 0.5 mL of propyltrimethoxysilane dropwise to the above dispersion, and react at room temperature for 18 h to obtain a fluorine-free self-cleaning coating.
[0043] 2) Preparation of coating
[0044] The obtained fluorine-free self-cleaning paint is respectively applied to the surfaces of different substrates such as textiles, metals and woods by means of spraying or dipping. When using the spraying process, the angle of the spray gun is 90° to the surface of the workpiece, and the distance between the spray gun and the surface of the workpiece is 20 cm. After treatment, ...
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