![]() ![]() Also, the reaction between water and isocyanates can cause condensation polymerization. ![]() oxygen reacts with drying oils and other unsaturated compounds to produce free-radicals and bring about polymerization. During the drying process there is no chemical change in the polymer.Nitrocellulose lacquers and decorative emulsion paints dry by this process.ĭrying by Chemical Reaction Between Paint and Air The polymer is fully formed in the can and, when free of solvent, is relatively hard and not sticky. In this case the paint does dry solely by evaporation of liquids. In fact, there are three broad mechanisms of drying, two of which involve chemical reaction, while one does not. Under some conditions some paints do not dry, which suggests that the drying process does not merely consist of evaporation of the liquid. Yet the paint must dry on the coated surface. In the can of paint the mixture of substances must remain stable for long periods, so the ingredients must not react with one another chemically. From "Introduction to Paint Chemistry and principles of paint technology" by John Bentley: ![]()
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