Preparation Of Nano Transparent Abrasion-resistant Coatings

Nanometer materials have become hotspots researched all over the world because of its unique nano characters in lately decade years. The nano-composite coatings can be manufactured by selecting appropriate nano-materials and polymer. The high abrasion resistant transparent coatings can apply for furniture floor and resin lens or eyeglass and other similarities.The coating has very important applied value.First of all, nano-alumina dispersed in water is studied. We selected anion polyelectrolyte PMAA and cation surface active reagent(CTAB) as dispersant. It is discussed that dispersant dosage, PH value, disperse time, disperse means and nano-alumina concentration affect disperse effect. The stability of nano-alumina aqueous dispersion is tokened by spectrophotometer and particle size distribution instrument. It is proved that when condition is dispersant PMAA =0.4%, pH =9, nano-γ-alumina content = 4%(Wt%),ultrasonic for twenty minites, excellent stable nano-alumina aqueous dispersion can be acquired. Nano particle average size is 205nm. Nano-α-alumina content = 2%(Wt%), PH=12, CTAB=0.1%, best nano-α-alumina aqueous dispersion can be acquired.Nano-γ-alumina surface is treated by stearic acid. It is proved by infrared spectral analysis that stearic acid can react with hydroxide of nano-alumina surface. Nano transparent abrasion resistant coating can be prepared by mixing modified nano-silica and modified nano-alumina with acrylic-PU and PE resin. Coating's transparent and abrasive characters are measured by spectrophotometer and abrasion instrument and sway pole sclerometer. As a result, lacquer's abrasion-resistant performance improved 100% adding 15% nano-alumina. Nano composite coating improved PMMA base 2.75 times. The transmission of visible light is about 80%.Nano transparent abrasion resistant coating can be prepared by mixing modified nano-silica with acrylic-PU. Lacquer's abrasion-resistant performance improved 26% adding 10% nano-silica. Nano composite coating improved PMMA base 1.82 times. The transmission of visible light is over 80%.Lastly, nano-alumina dispersed in coating was observed by SEM. Particle size of nano-alumina in resin is mainly within 20-100nm.The coating's abrasion mechanism is cooperation of adhere and abrasive stuff wearing.The preparation of aqueous abrasion resistant coatings is primarily explored. Firstly, aqueous PU latex is synthesized, and then add nano-alumina aqueous disperse liquid. The hardness can be improved from 3B to 2H if added 40% nano-alumina aqueous disperse liquid. Certainly, added much enough, the transparence is harmed. We synthesize organosilicone resin by in situ polymerization. The coating's hardness even reaches at 5H, but it is brittle. So we add a small quantity of epoxy resin to the coatings to attain better compositive performance.