PURPOSE: To provide a powdered thermosetting resin paint having a specified particle size and suitable for use in coating the inner surface of a tubular member, consisting of an epoxy resin and a phenolic or dicyandiamide hardener.
CONSTITUTION: A powdered paint consists of an epoxy resin having an epoxy equivalent of 600W950 and a phenolic or dicyandiamide hardener, has an average particle size of 80W150μm and contains fine particles having a particle size of 50μm or below in a quantity of not more than 10% based on the total quantity of the particles. When the average particle size of the powdered paint is smaller than 80μm, or the content of the fine particle having a particle size of 50μm or below exceeds 10%, the flow characteristics of the paint in a high-temperature atmosphere are poor so that when the paint is applied by rotatinal coating, the powdered paint accumulates at that position of a tubular member where the paint is fed, the paint can not be smoothly moved by the rotation of the member and hence the unevenness in coating is formed. When the average particle size exceeds 150μm, the surface smoothness of the resulting coating film is poor and the appearance of the film is inferior.
SAITOU KIYOSHI
KUWAMURA MAKOTO
TAJIRI KAZUHIRO
