Preparation of Water-proof Coatings by Thermal Crosslinking of Water Soluble Poly(N-methylolacrylamide)

Abstract

The organic solvents included in paints are harmful to the human and environment. Therefore, alternative paint using water as a solvent has attracted a lot of attention. However, there remains technical issue in both of solubility of resins and water resistant of the coated film. We focused on poly(N-methylolacrylamide), the N-methylol groups of which react each other and lose hydrophilic hydroxyl groups due to self-condensation by heating. We revealed that the polymer was soluble in water while the cured one was not soluble in water. Moreover, the coated film containing a silane coupling agent remained intact in water even after 24 h.