Acid and alkali resistance of Acrylic polyurethane/R‐SiO2 nanocomposite coating

Abstract

AbstractThe purpose of this study is to assess the influence of R‐SiO2 nanoparticles on acid and alkali resistance of acrylic polyurethane coating. The resistance of the coatings with and without 2.5 wt.% R‐SiO2 nanoparticles in 5 % HCl solution and 5 % NaOH solution was investigated by monitoring the variations in functional groups of the coatings using IR spectroscopic analysis and the changes in their morphology using FE‐SEM analysis, as well as their weight loss analysis. The results showed that R‐SiO2 nanoparticles at content of 2.5 wt.% significantly increased the acid and alkali resistance of acrylic polyurethane coating. After 20 days of immersion in 5 % HCl solution and 5 % NaOH solution, the nanocomposite coating containing 2.5 % R‐SiO2 nanoparticles changed negligibly with a weight loss of about 1 % while the coating not containing R‐SiO2 nanoparticles was deformed seriously with a weight loss of about 3 %.