防食塗装に関する研究-1-塗膜のガラス転移温度の決定について

概要

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Adhesion of organic coatings on steel on exposure to water (wet adhesion) is the most important property for a good corrosion protection, The glass transition temperature (Tg) of the coatings is a factor determining the wet adhesion. Tg of many coatings is lowered by water. This work investigates how the water uptake affects the Tg of various coatings. A coating-stressmeter was used to determin Tg in dry and wet conditions. It was found that water disrupted the intermolecular interactive hydrogen-bridges and hence reduced the Tg of an exposy-polyamine greatly.<BR>A good wet adhesion is expected if the interaction between coating and steel surface is stable to effects caused by penetrating water. Increase in Tg by dispersing iron oxide flake treated by poly (acrylic acid) solution indicates how to achieve the stable interface for a good corrosion protection.
色材協会の論文