Meister Lackierer Practice Questions - Meisterprüfung Lackierer (Austria) Exam

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In modern 2K polyurethane (PUR) clearcoat formulations used in automotive and industrial finishing, what chemical reaction mechanism takes place between the binder polyol and the polyisocyanate hardener?
Correct Answer:
A polyaddition reaction between hydroxyl groups (-OH) of the acrylic resin and isocyanate groups (-NCO) forming urethane linkages without the release of volatile cleavage byproducts

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