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The UV-screening properties of coating layers : The influence of pigments, binders and additives

机译:涂层的紫外线屏蔽性能:颜料,粘合剂和添加剂的影响

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摘要

The ability of coating colours to obstruct ultraviolet (UV) radiation in the 300-385 nm region was examined with the aim of finding the best photo-stabilising formulation to inhibit discoloration of high-yield pulps. The influence of pigment type, bleaching of the pigments, pigment size, pigment size distribution, type of binder and addition of U-V-absorbing compounds were examined using a newly developed method for studying the reflectance and transmittance properties of thin coating layers. The pigment type and coat weight was found to be the most important factors for reducing the transmittance of UV-radiation. Kaolin clays were more effective than calcium carbonate pigments and are therefore a better coating pigment for photostability reasons. Bleaching of the pigments, resulted in an overall minor decrease in transmittance for both kaolin and ground calcium carbonate (GCC) pigments, especially at low coat weights. Bleaching of the pigments changed the particle size distribution somewhat, which probably alters the structure in the coating layer. Precipitated calcium carbonate (PCC) pigments have a higher UV-screening potential compared to GCC pigments and should therefore be a better choice among the calcium carbonates. It was further concluded that a narrow pigment size distribution was beneficial for reducing the amount of transmitted UV-radiation that reaches the base paper. Styrene butadiene latex and polyvinylpyrrolidone were better in reducing the transmittance in the UV-region than polyvinyl alcohol. Adding a fluorescent whitening agent to a coating colour decreased the transmittance in the UV-region when the pigment was of the GCC type, and increased the transmittance when kaolin pigment was used. Addition of titanium dioxide (3 parts) to a coating colour containing kaolin pigment blocked about 90% of the UV-radiation at a coat weight of 10 g/m(2), which is a common coat weight for a single coated paper. Another possibility is to double coat to increase the coat weight, which turns the transmittance factor closed to zero.
机译:为了找到最佳的光稳定配方以抑制高产量纸浆的变色,检查了涂料在300-385 nm区域内阻挡紫外线(UV)辐射的能力。使用一种新的研究薄涂层的反射率和透射率特性的方法,研究了颜料类型,颜料漂白,颜料尺寸,颜料尺寸分布,粘合剂类型和添加U-V吸收化合物的影响。发现颜料类型和涂层重量是降低紫外线辐射透射率的最重要因素。高岭土比碳酸钙颜料更有效,因此由于光稳定性原因是更好的涂料颜料。颜料的漂白导致高岭土和磨碎的碳酸钙(GCC)颜料的透射率总体略有下降,特别是在低涂层重量的情况下。颜料的漂白在某种程度上改变了粒度分布,这可能改变了涂层的结构。与GCC颜料相比,沉淀的碳酸钙(PCC)颜料具有更高的紫外线屏蔽潜力,因此应该是碳酸钙中更好的选择。进一步得出结论,狭窄的颜料尺寸分布有利于减少到达原纸的透射紫外线辐射量。苯乙烯丁二烯胶乳和聚乙烯吡咯烷酮在降低紫外线区域的透射率方面优于聚乙烯醇。当颜料为GCC型时,在涂料色料中添加荧光增白剂会降低UV区的透射率,而当使用高岭土颜料时会提高透射率。在涂料重量为10 g / m(2)的情况下,向含有高岭土颜料的涂料中添加二氧化钛(3份)可阻挡约90%的紫外线辐射,这是单张涂料纸的常见涂料重量。另一种可能性是双层涂层以增加涂层重量,这使透射率因子接近于零。

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