ABSTRACT Enhancing the weather resistance of outdoor coatings is an important challenge. Herein, hollow titanium dioxide is synthesized and incorporated into the acrylic resin to improve the weather resistance. While titanium dioxide can absorb and scatter UV radiation, the presence of hollows in these materials further enhances the weather resistance of acrylic coatings. For this purpose, polystyrene templates are used to synthesize hollow titanium dioxide with an average size of 350 nm. The morphology and structure of the particles are investigated by FESEM, XRD, and FTIR. Furthermore, an attempt is made to prove the hollowness of particles with more comprehensive and easier methods based on properties of coating. In the next step, the efficiency of the synthesized particles in protecting the coating is evaluated by QUV testing. The results show that after 300 h in QUV chamber, the yellowness of the blank coating, containing hollow particles sample, and containing organic UV absorber sample are 4.048, 1.327, and 0.492, respectively. The color differences ( ΔE ) of the mentioned coatings are obtained in the same order as 5.749, 1.494, and 2.329. These results demonstrate that the use of synthesized particles increases the lifetime of the coating and reduces costs.
Roshan et al. (Thu,) studied this question.