sažetak izlaganja sa skupa
Coating application is the process of covering a surface or substrate with another substance to protect it temporarily or permanently from deterioration due to reaction with the environment or corrosive substances. The main components of coating systems are primers, intermediate coatings, and topcoats. The function of the topcoat is to provide a sealing for the coating system. They must have good adhesion to the primer and high hardness to protect the protected part from scratches. In addition, topcoats provide the desired appearance in terms of color and gloss, so they must be UV resistant.
In this work, solvent-borne topcoats from two different manufacturers were dried under atmospheric conditions and with infrared radiation (IR). Some of the samples dried in an infrared chamber were intentionally overdried, in order to examine the effects of overdrying on the physical and chemical properties of the examined topcoats. For this purpose, the samples were left in the IR chamber two and three times longer than required for their complete drying to simulate the production process. To assess physical properties of tested topcoats, pull-off adhesion and Shore D hardness tests were performed. TGA, DSC and FTIR analyzes were performed to determine the chemical properties of the differently dried topcoats. The examined topcoats achieved satisfactory results regardless of the drying method.
corrosion protection, infrared drying, organic topcoats, polyurethane, polysiloxane
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