Journal of the Japan Society of Colour Material
Online ISSN : 1883-2199
Print ISSN : 0010-180X
ISSN-L : 0010-180X
Studies on Cratering in Paint Films. III.
Effects of the Dispersion State of Silicone Oils
Tadaaki SATOHNaoko TAKANO
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1973 Volume 46 Issue 8 Pages 419-426

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Abstract

Regarding to the cratering in paint films, an investigation was made in connection with the effect of the physico-chemical properties of silicone oils added to the paint for preventing the flooding, and results were obtained as follows.
1) Craters appear in all cases where paints containing silicone oils in an amount exceeding their solubility limit are used.
2) There is a close correlation between the tendency of cratering and the condition of the silicone oils dispersed in paints as particles. Craters appears without exception in cases where the radius of the particles exceeds a critical value determined depending on the nature of the paint and coating film thickness.
3) Stirring of the paint gives an impetus to the growth of the silicone oil particles.
Refering to the above results, it is concluded that the silicone oil added to the paint should be soluble perfectly, otherwise it may become the origin of the craters in coating films.

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