1-Pack Polyurethane Coil Coating Primer (Formulation #2.3) is a guideline formulation based on Dynapol L205 (high molecular weight polyester resin) crosslinked with Desmodur BL 3175 (a blocked isocyanate). Dabco T12 (dibutyltindilaurate) was used as the catalyst. SHIELDEX® C 303 is a high performance non toxic heavy metal free, anti-corrosive pigment specially designed to replace Strontium Chromate in coil coating primers.
The 1-Pack-Polyurethane primer was tested on Bonder 1303 treated galvanised steel test panels (ex Chemetall) at a bar coated dry film thickness of 5 microns. Cure was to a peak metal temperature (PMT) of 224 °C. A polyester-melamine topcoat was applied to a bar coated dry film thickness of 20 – 25 microns and cured to a PMT of 232 °C.
GRACE Davison is a division of W.R. Grace & Co., a world leader in specialty chemicals, with specialization in silica and silica alumina technology. Grace Davison silica products have successfully been used for many years as performance enhancing additives for diverse Coatings applications, ranging from industrial coil and wood coatings applications to high quality architectural coatings.
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