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Effect of TiO_2 pigment type on the UV degradation of filled coatings

机译:TiO_2颜料类型对填充涂料UV降解的影响

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摘要

The objective of this study was to investigate the effect of the photoreactivity of titanium dioxide (TiO_2) pigments on the photodegradation of polymeric coatings used in exterior applications. Two polymer matrices, an amine-cured epoxy (EP) and an acrylic urethane (AU), containing three types of TiO_2 pigments, classified by different levels of photoreactivity, were studied. Specimens were exposed on an ultraviolet (UV) weathering chamber, the Simulated Photodegradation by High Energy Radiant Exposure device at the National Institute of Standards and Technology. Two exposure conditions were used: ambient, dry condition [25℃ and 0% relative humidity (RH)] and high temperature, wet condition (55℃ and 75% RH), which is similar to more severe outdoor exposures. The physical and chemical degradations of the filled coatings were monitored at periodic intervals using a combination of laser scanning confocal microscopy (LSCM) and attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR). Progression of degradation on the coating surfaces was characterized by LSCM in terms of changes in surface roughness and morphology, pigment agglomerate size, and the occurrence of pits or holes in the coatings. The observed physical changes were correlated to the chemical changes measured by ATR-FTIR as a function of UV exposure time. Both EP and AU systems showed less degradation in terms of surface roughness and morphological changes under the dry conditions compared to the wet exposure conditions. It was observed that both the pigment type (and hence photoreactivity) and particle dispersion strongly affected the degradation of both EP and AU systems.
机译:这项研究的目的是研究二氧化钛(TiO_2)颜料的光反应性对外部应用中聚合物涂料的光降解的影响。研究了两种聚合物基体,一种胺固化的环氧树脂(EP)和一种丙烯酸氨基甲酸酯(AU),它们包含三种类型的TiO_2颜料,并按不同的光反应性进行分类。样品被暴露在美国国家标准技术研究所的高能辐射曝光装置模拟的光降解紫外线(UV)风化室上。使用两种暴露条件:环境,干燥条件[25℃和0%相对湿度(RH)]和高温,潮湿条件(55℃和75%RH),这与更严重的室外暴露相似。使用激光扫描共聚焦显微镜(LSCM)和衰减全反射-傅立叶变换红外光谱(ATR-FTIR)的组合,定期监测填充涂层的物理和化学降解。 LSCM通过改变表面粗糙度和形貌,颜料团聚体尺寸以及在涂层中出现凹坑或孔洞来表征涂层表面的降解进程。观察到的物理变化与通过ATR-FTIR测量的化学变化相关,该变化是紫外线暴露时间的函数。与湿暴露条件相比,在干燥条件下,EP和AU系统在表面粗糙度和形态变化方面均表现出较少的降解。观察到颜料类型(以及光反应性)和颗粒分散性都强烈影响EP和AU系统的降解。

著录项

  • 来源
    《JCT》 |2011年第1期|p.19-33|共15页
  • 作者单位

    Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8615,Gaithersburg, MD 20899, USA,Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, CA 93407,USA;

    Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8615,Gaithersburg, MD 20899, USA;

    Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8615,Gaithersburg, MD 20899, USA;

    Building and Fire Research Laboratory, National Institute of Standards and Technology, 100 Bureau Drive, Stop 8615,Gaithersburg, MD 20899, USA;

    School of Chemical Engineering, Purdue University, West Lafayette, IN 47906, USA;

    Department of Chemistry and Biochemistry, California Polytechnic State University, San Luis Obispo, CA 93407,USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    attenuated total reflectance-fourier transform infrared spectroscopy; laser scanning confocal microscopy; photoreactivity; polymeric coating; titanium dioxide; ultraviolet degradation;

    机译:衰减全反射傅里叶变换红外光谱;激光扫描共聚焦显微镜光反应性聚合物涂层二氧化钛;紫外线降解;

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