Abstract

The results of a study of the weather resistance of protective and decorative organosilicate coatings prepared using organosilicate compositions based on polydimethylphenylsiloxane as a binder and hydrosilicates as fillers are presented. The color of the coatings varies due to the use of pigments: natural FeO_x minerals of yellow, red-brown, and brown shades of flowers. Using X-ray phase and X-ray fluorescence (XRF) analysis, it is established that the composition of minerals is primarily determined by iron oxides in the crystalline modification of hematite (α-Fe₂O₃) and goethite (α-FeO(OH)). Pigments contain a small number of impurity compounds of a number of elements that contribute to the color range of the coatings. Organosilicate coatings are exposed for 11 months in the tropical climate of two climatic zones of Vietnam (in the suburbs of Nha Trang and Ho Chi Minh City). The high corrosion resistance and color stability of the coatings are established during the entire test period. According to slight changes in the color and gloss, revealed by spectrophotometric and photoelectric methods, it is shown that higher resistance to solar radiation and other adverse climatic factors is typical for coatings with a brown pigment based on hematite; and the lowest, with a yellow pigment based on goethite.

中文翻译：

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有机硅酸盐涂料在热带气候下的耐候性取决于颜料的选择

摘要

介绍了使用基于聚二甲基苯基硅氧烷作为粘合剂和硅氢酸盐作为填料的有机硅酸盐组合物制备的保护性和装饰性有机硅酸盐涂层的耐候性的研究结果。涂层的颜色因使用的颜料而异：黄色、红棕色和花棕色色调的天然 FeO _x矿物。利用X射线相和X射线荧光（XRF）分析，确定矿物的成分主要由赤铁矿（α-Fe ₂ O ₃）和针铁矿（α-FeO​​（哦））。颜料含有少量多种元素的杂质化合物，这些元素构成了涂层的颜色范围。有机硅酸盐涂料在越南两个气候带（芽庄和胡志明市郊区）的热带气候中暴露11个月。在整个测试期间建立了涂层的高耐腐蚀性和颜色稳定性。根据分光光度法和光电法显示的颜色和光泽度的轻微变化，表明基于赤铁矿的棕色颜料的涂料具有较高的抗太阳辐射和其他不利气候因素的能力；最低的是基于针铁矿的黄色颜料。