The Application Of Nano-silica In Uv Curable-coating

Ultraviolet-curable paint/nano-SiO2 composites were prepared via mechanical blending route, using in-situ surface-modified nanosilica as the reinforcing agent, The effects of surface chemical structure and composition of nanosilica on the properties of the reinforced paint were investigated, The properties of nanosilica modified UV-Curable coatings were studied. UV-curable coatings containing different active monomers were prepared, the properties of nanosilica modified UV-coatings were investigated. The main conclusions are listed as follows:1,A series of dispersible silica nanoparticles were synthesized using sodium metasilicate or silicate ester as precursor of silica by surface-modification in situ. Some functional nano-silica particles such as reactable nano-silica, super-hydrophobic nano-silica, and nano-polysilicon were also obtained by changing reaction parameters and species of modifiers.2,Naosilica modified UV-curable coatings were prepared by mechanical blending, The properties of the nanocomposites were investigated. Results show that with increasing silica content, the hardness and frinction coefficient of the coating increased, but curing time decreased. Under 300℃the thermal stability was enchanced; but at higher temperature it declined.3,UV-curable coatings containing different active monomers were prepared. The effect of the active monomers on film formation, hardness, and curing time of the coatings was investigated. Results show that the coating with TMPTA as active monomer has the high best hardness and least curing time, the coating containg active monomers AA and TMPTA has the best transmittance.4,UV-curable EA-TMPTA and EA-AA-TMPTA were separately doped with in-situ surface-modified nanosilica at different dosage, generating corresponding composite coatings. It was found that the hardness and wear resistance of the composite coatings increased with increasing content of nanosilica, and the curing time, was shortened therewith. The friction coefficient and thermal stability of doped EA-TMPTA increased, but its resistance to water was decreased. The thermal stability and water resistance of doped EA-AA-TMPTA, and its friction coefficient was decreased.