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Application and Characterization of Nanometer Titanium Dioxide in Coatings
First, nano-coating preparation experimental part
Modified styrene-acrylic emulsion, wetting agent, carbon dodecanol ester, ethylene glycol, nano-titania VK-T06 , hydroxyethyl cellulose, dispersant, conditioning aids, and other additives.
A certain amount of nano titanium dioxide VK-T06 is added to the original styrene-acrylic latex paint formulation. It is pre-dispersed with the pigment system ( with a certain amount of anionic surfactant added ) by grinding, and then dispersed in the system by a multi-functional dispersing machine. , Configured into nano-modified styrene-acrylic exterior latex paint.
Second, nano-modified paint performance characterization
   After 500 hours of artificial aging experiments it can be concluded that addition of rutile titanium dioxide ,, VK-T06 and added in an amount of about 0.5 to 1%, a significant reduction in coating film aged phenylpropyl latex paint, titanium dioxide described VK-T06 It shields the UV light and effectively protects the coating. According to the discoloration difference ( △ E value ) display, it shows that the use of nano-titania VK-T06 with nano-silica VK-SP30 is better for UV shielding.
Add 0.5% nanometer titanium dioxide VK-T06 modified coating and exterior nanometer titanium dioxide VK-T06 latex coating to compare the performance of scrub resistance and anti-aging properties. All technical performance indicators have been greatly improved, and the anti-friction and anti-scrubbing performance of the paint has increased by 13 times.
Third, mechanism analysis
   Anti-aging properties are an important property of coatings. In fact, the aging of materials is various. It includes ultraviolet aging, thermal aging, ozone aging and chemical aging. Among these factors, UV is the most important factor causing the aging of coatings. Ultraviolet light is an electromagnetic wave shorter than the wavelength of visible light, and its wavelength is between 200-400nm . According to the wavelength , it can be divided into short-wavelength UVC (200-280nm) , medium- wavelength UVB (280-320nm) , and long-wavelength UVA (320-400nm) . Under normal circumstances, the aging of materials is the medium-wave UV and long-wave ultraviolet, because short-wave UV can not reach the surface of the earth in general, but with the continuous destruction of the earth's ozone layer, short-wave ultraviolet radiation began to radiate the surface of the Earth, the UV index continues to increase. The shorter the wavelength of ultraviolet light radiated to the surface of the earth, the stronger the energy, and the greater the damage and destructiveness to the human body and polymer materials.    VK-T06 titanium dioxide to ultraviolet light shielding absorption and scattering are mainly detected by UV spectrophotometer, its rate of shielding ultraviolet 200nm or more as high as 99.99%, when the content of the aqueous solution per 100,000 seasons The UV shielding rate remained above 99.9% . Nano-silica is based on the main reflector, with the US company Varian Cary-5E spectrophotometer nano SiOX multiple sampling test, which was found good repeatability of the optical reflection spectrum, (320nm-400nm) reflectance in the long wavelength UV 88% ; mid-band ultraviolet (280nm-320nm) reflectance of 85%; short wavelength ultraviolet (200nm-280nm) reflection rate is still 70-80%.
IV. Conclusion
1. Compared with ordinary latex paints, nano-emulsion nano-emulsion paint with nano-TiO2 VK-T06 powder has 13 times better scrub resistance and anti-aging properties .
2. Compared with ordinary latex paints, Nano-Titanium VK-T06 nano-emulsion - based nano-emulsion paints have a two- fold increase in water and weak acid resistance , and can effectively shield ultraviolet rays.
3 , nano-titanium dioxide added VK-T06 powder external nano-wall latex paint compared with ordinary latex paint, has a better anti-mildew, anti-bacterial ability, anti-fouling function has been greatly improved.
4. The addition of nano-titania VK-T06 and nano-silica VK-SP30 is more significant than the mono-type nano-materials.
5. When used, the better the dispersion, the more obvious the above effects.