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Sunday, 22 September 2019
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Raw materials & technologies, Raw materials, Coatings additives

Organic and inorganic light stabilisers compared

Monday, 23 July 2012

In a new study, different UV absorbers for waterborne coatings are tested, analysing their protective function in joinery coatings as well as their influence on coatings colour and transparency.

In a new study, UV absorbers for waterborne coatings are analysed

Source: Fine2art/Pixelio

In a new study, UV absorbers for waterborne coatings are analysed

Source: Fine2art/Pixelio

As a consequence of regulatory pressure to reduce solvent emissions, "compliant technologies” such as waterborne (WB) coatings are on the rise. However, a change from conventional solventborne (SB) to WB technologies should not compromise the protective function of the coatings and the used raw materials. The use of light stabilizers, such as UV absorbers (UVA) and hindered amine light stabilizers (HALS) are state-of-the-art and largely improve the coating durability and service lifetime.

Today in the case of UVA one has to differentiate between inorganic and organic products: the most widely used organic UVA for coating applications are 2-(2-hydroxyphenyl)-benzotriazole (BTZ) and 2-hydroxyphenyl-s-triazine (HPT) derivatives. Inorganic products are ideally nano particulate materials - so-called mineral screeners (MS) - comprised of titanium dioxide (TiO2), zinc oxide (ZnO), or cerium oxide (CeO2). The challenge here is to convert existing products which are in general hydrophobic substances into product forms that enable easy incorporation and unproblematic dispersion into WB systems.

In a new study in the "Journal of Coatings Technology and Research” (Vol. 9, No. 4, 2012), Christian Schaller, Daniel Rogez und Adalbert Braig describe UV absorbers which are commercially available for waterborne coatings. Different classes are tested with regard to their protective function in joinery coatings as well as with regard to their influence on coatings colour and transparency. The findings of this study showed clearly that the 2-hydroxyphenyl-s-triazine class outperforms all other UVA in terms of long-term performance without influencing initial coating properties.

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