Influence of paint components on photoactivity of P25 titania toward NO abatement

The present work studies the interference of paint components on the photoactivity of P25 photocatalyst toward NO abatement. Paint components are divided in two major groups: powder inorganic components and organic components. Two types of films were prepared, powder pressed films and films made of pseudo-paints, and their photoactivity assessed following approximately standard ISO 22197-1:2007(E). Powder pressed films were obtained by stepwise mixing powder components of the base paint; pseudo-paint films involved mixing the powder components stepwise with families of organic components present in the original photocatalytic paint formulation.It was concluded that the morphology of powder pressed films influences the photoactivity while CaCO₃ and silicates, which are extenders, have a smaller impact on P25 photoactivity compared to pigmentary TiO₂.Pseudo-paint films containing the same proportion of powder components as powder pressed films displayed different transient behaviors but similar steady-state photo-activities, regardless the presence of organic components such as the binder. This was assigned to the photo-erosion of a significant fraction of the organic paint components during the transient period. Therefore, after reaching steady-state, NO photooxidation could proceed freely as if only inorganic paint components were present. An average of ca. 25 wt.% of organic phase erosion was observed but more severe erosion should occur closer to the top of the paint film.     

Characterization of bile acids and fatty acids from ox bile in oil paintings by gas chromatography-mass spectrometry

Characterization of ox bile, traditionally used in painting, is of interest in the fields of archaeometry and conservation and restoration of works of art. Bile acids, fatty acids (F), and cholesterol found in ox bile have been identified using a derivatization method that combines the formation of ethyl esters from the carboxylic groups and the trimethylsilyl ethers from hydroxyl groups. This method of analysis is consistent with these others proposed by the authors to analyze drying oils, proteins, and diterpenic resins usually used as binders and varnishes by the painters. Bile acids from binary samples such as animal glue/ox bile, casein/ox bile and Arabic gum/ox bile have been successfully analyzed using the proposed method. Finally, a method of analysis of mixtures of drying oil and ox bile has been also proposed attempting to quantitatively characterize samples in which ox bile was added to the drying oil for increasing the surfactant properties.     

反应性聚合物微凝胶的合成及应用

反应性聚合物微凝胶是一种具有反应活性,分子内交联的高分子。它具有优良的加工性能,涂膜的力学性能及耐久性也十分优异,主要应用于制备高档涂料或对涂料进行改性,本文着重介绍了反应性聚合物微凝胶的合成方法及其在涂料改性方面的应用。     

电感耦合等离子体原子发射光谱法测定防污漆中的铜和锡

本文用电感耦合等离子体原子发射光谱法同时测定防污漆中的铜和锡。对样品的前处理方法进行了探讨，并研究了仪器工作参数、酸度、共存金属元素锌对被测元素的影响，确定了最佳分析条件。     

原子吸收光谱法测定涂料中可溶性镉和总镉

建立了石墨炉原子吸收光谱法测定涂料中可溶性镉和总镉的方法。解决了涂料中镉的测定问题,探讨了样品的处理条件、基体改进剂的选择、共存元素干扰的消除以及仪器工作条件的优化。镉的线性范围为1.0—50.0μg/L,方法的检出限为0.32μg/L,回收率为85.0%—92.5%,精密度为2.85%—4.49%。