Abstract
Fluorescent coatings have attracted attention due to their bright colors. However, they have fewer outdoor applications due to low stability, especially the poor weather resistance of the fluorescent pigments. In order to improve their weather resistance and maintain the excellent appearance, this study used polymer binders to coat a light shielding agent nano TiO2 on the surface of the fluorescent pigment to extend the durability. Three organic binders, polyester varnish, polyurethane varnish, and polyvinyl alcohol, were selected. Each binder was dissolved and mixed with pigments and nano TiO2 particles to make a polymer-TiO2 layer on the pigment surface. The effects of binder types and loadings were investigated and evaluated by accelerating weather test of corresponding fluorescent powder coatings. According to SEM and ash test, nano TiO2 was successfully coated on the surface of fluorescent pigments. The modified fluorescent pigment shows a strong ability to absorb ultraviolet rays, and the weather resistance of prepared coatings has been significantly improved compared with the original fluorescent powder coating. When using clear coat PE as a binder and setting the ratio of the binder to the nano TiO2 of 1:2, the UV exposure time of fluorescent powder coatings can be extended by over twelve times compared to the coatings with original pigment for the same color change. This study provides an effective approach to enhance the weather resistance of fluorescent coatings and thus expand their applications.
Highlights
With the development of the coating field, expansion of the coatings market, and, in particular, the tightening of national environmental protection policies, environmentally friendly powder coatings [1–3], with the advantages of no volatile organic compound (VOC) emission, high efficiency, and recyclability, has gradually become an indispensable component of the coating industry
In order to expand the application of fluorescent powder coatings, improving the UV resistance of fluorescent pigments is an important subject in the coatings industry
This paper proposes a facile method to coat anti-ultraviolet material nano TiO2 onto fluorescent pigments to enhance their UV resistance
Summary
With the development of the coating field, expansion of the coatings market, and, in particular, the tightening of national environmental protection policies, environmentally friendly powder coatings [1–3], with the advantages of no volatile organic compound (VOC) emission, high efficiency, and recyclability, has gradually become an indispensable component of the coating industry. In order to expand the application of fluorescent powder coatings, improving the UV resistance of fluorescent pigments is an important subject in the coatings industry. UV protecting agents [8–10] are introduced to powder coating systems to improve the UV resistance, which can reduce the transmission of ultraviolet light and protect the internal coating polymer from light damage. Nano titanium dioxide (TiO2) is one of the widely used UV adsorbers with a good UV shielding effect [11]. It can generate free radicals when irradiated with ultraviolet rays, absorb light with energy greater than its forbidden bandwidth (about 3.2 eV) [12], and convert it into thermal energy or fluorescence. Modification of pigments with nano TiO2 would be one of the solutions providing protection to pigments, which can create a barrier and protect the internal pigment
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