Improvement of scratch resistance of UV cured wood coatings by using nano alumina particles via nano indentation: Fid-Bau Portal

Improvement of scratch resistance of UV cured wood coatings by using nano alumina particles via nano indentation

Bastani, Saeed / Ebrahini, M. / Kardar, P. / Jalili, M.

In this research, an epoxy acrylate resin was synthesized, and then the resin was used along with different multifunctional acrylate monomers i.e. trimethylol propane triacrylate (TMPTA), tripropylene glycol diacrylate (TPGDA), 1,6 hexan diol diacrylate (HDDA) and cured under UV radiation. The effect of the chemical structure of the monomers on some of the physicalmechanical properties of the resins, such as Tg, hardness, scratch resistance and viscosity was studied. To minimize the number of experiments, mixture method was used as an appropriate tool for experimental design. To investigate the effect of nano particles on some of physical and mechanical properties i.e. scratch, hardness and gloss, of the UV cured resins, a suspension of nano alumina in TPGDA, was included in the formulations. The scratch resistance was determined by pencil hardness test and nano scratch tester (NST).The hardness of prepared films was evaluated by using konig hardness tester and nano indenter. The results showed that the viscosity of the prepared formulations decreased by increasing HDDA and TPGDA monomers. The mar resistance of the cured resins improved by increasing TPGDA. In addition, The Tg and indentation hardness of the cured resins improved by increasing TMPTA. Also the visibility of scratch decreased when the nano particles were used. It seems that the self-healing property of the films improved in the presence of nano particles. The hardness of the samples with nano particles was found to be less than that of the samples without any nano particles. It was also observed that the gloss of films with the nano particles remained high.