A study of the weathering mechanism of innovative polyurethane powder coatings has been performed. UV-B irradiation and condensation cycle accelerated tests were carried out on two different polyurethane powder coating formulations for outdoor applications. Using Fourier transform infrared spectroscopy and microscope observation, it was possible to analyze the photochemical and morphological modifications. In addition, the color and gloss changes were measured. Organic coatings are often in contact with solvents in particular during cleaning actions. The chemical resistance was then studied considering the evolution of the corrosion barrier property of the coating as a function of the solvent contact time. Electrochemical impedance spectroscopy measurements were carried out. Methylethylketone (polar) and xylene (apolar) were considered as representative solvents. Due to the strong polarity, the first solvent showed a strong interaction with the hydrogen bonds between the polyurethane chains causing the solvent uptake. The amount of solvent uptake depends on the coating chains rigidity caused by the different polyester resin monomers. The apolar xylene presented no significant interaction with the coatings.

S. Rossi

M. Fedel

S. Petrolli

F. Deflorian

Journal of Coatings Technology and Research

JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH (JCTR) 是一个论坛，供那些对功能性、保护性和装饰性涂料（包括油漆、油墨和相关涂料）的科学、技术和制造有专业兴趣的人交流研究、经验、知识和想法及其原材料，以及类似的主题。

The Journal of Coatings Technology and Research (JCTR) is a specialized forum designed to provide a platform for researchers with professional interests in the science, technology, and manufacturing of functional, protective, and decorative coatings, including paints, inks, and related materials. The journal covers topics related to research, experiences, knowledge, and raw materials, fostering collaboration and communication between academia and industry.

《Journal of Coatings Technology and Research》是一个专门的论坛，旨在为对功能性、保护性和装饰性涂料（包括油漆、油墨及相关涂料）的科学、技术和制造有专业兴趣的研究人员提供一个交流平台。该期刊涵盖研究、经验、知识和原材料等相关主题，促进学术界与工业界之间的合作与沟通。

Category	Quartile
材料科学	4
材料科学, 应用化学	4
材料科学, 材料科学膜	4

Accelerated weathering and chemical resistance of polyurethane powder coatings

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Journal Info

Category	Quartile
MATERIALS SCIENCE, COATINGS & FILMS	3