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首页> 外文期刊>Journal of coatings technology and research >Organic vs inorganic light stabilizers for waterborne clear coats:a fair comparison
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Organic vs inorganic light stabilizers for waterborne clear coats:a fair comparison

机译：水性清漆的有机和无机光稳定剂：合理的比较

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As a consequence of regulatory pressure to reduce solvent emissions, there is high growth rate of "compliant technologies" such as waterborne (WB) coatings. However, a change from conventional sol-ventborne (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-hydroxy-phenyl-s-triazine (HPT) derivatives. Inorganic products are ideally nano paniculate materials-so-called mineral screeners (MS)-comprised of titanium dioxide (TiO_2), zinc oxide (ZnO), or cerium oxide (CeO_2). 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. This article describes 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 color and transparency. The findings of this study showed clearly that the 2-hydroxyphenyl-s-tri-azine class outperforms all other UVA in terms of long-term performance without influencing initial coating properties.
机译：作为减少溶剂排放的监管压力的结果，诸如水性（WB）涂料等“兼容技术”的增长率很高。但是，从传统的溶剂型（SB）到WB技术的更改不应损害涂料和用过的原材料的保护功能。使用诸如紫外线吸收剂（UVA）和受阻胺类光稳定剂（HALS）的光稳定剂是最新技术，可大大提高涂层的耐久性和使用寿命。如今，就UVA而言，必须区分无机产品和有机产品：用于涂料应用的最广泛使用的有机UVA是2-（2-羟苯基）-苯并三唑（BTZ）和2-羟基-苯基-s-三嗪（HPT） ）衍生产品。无机产品是理想的纳米颗粒材料，即所谓的矿物筛选剂（MS），由二氧化钛（TiO_2），氧化锌（ZnO）或氧化铈（CeO_2）组成。这里的挑战是将通常为疏水性物质的现有产品转换为易于掺入并毫无问题地分散到WB系统中的产品形式。本文介绍了市售可用于水性涂料的紫外线吸收剂。测试了不同类别的产品在细木工涂料中的保护功能以及对涂料颜色和透明度的影响。这项研究的结果清楚地表明，就长期性能而言，2-羟基苯基-s-三嗪类优于所有其他UVA，而不会影响初始涂层性能。

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