Characterization of coil coatings by thermal analysis

• Published in: Journal of applied polymer science 2003-03, Vol.87 (12), p.2016-2022
• Main Authors: Korhonen, M., Starck, P., Löfgren, B.
• Format: Article
• Language: English
• Subjects: Applied sciences; Coatings. Paints, varnishes and inks; coil coating; curing; Exact sciences and technology; Film formation and curing, properties, testing; Polymer industry, paints, wood; thermal analysis
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.11702

The interrelationship between the network formation process and performance properties makes cure process studies critically important in the coil‐coating industry. The objective of this work was to introduce thermal analysis into the evaluation of curing of uncured samples and in studies of the glass‐transition temperatures of cured samples. Thermal analysis, dynamic mechanical analysis (DMA), and differential scanning calorimetry (DSC) were used to characterize gelation and curing of three types of samples: paints, coated sheets, and free films. In addition to the generally used three‐point‐bending and extension geometries, a cup‐and‐plate geometry also was used in analyzing gelation and curing of liquid samples. These thermal analyses are suited to the purpose of characterizing coil coatings. A correlation between PMT (peak metal temperature) and measured Tg (glass‐transition temperature) was found, as well as effectively distinguishing different curing conditions. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 87: 2016–2022, 2003