材料
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
応力塗料膜の溶剤に関する研究
菅野 昭井上 康博
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ジャーナル フリー

1975 年 24 巻 257 号 p. 164-170

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Although it is well known that brittle lacquer coating of air-drying type is superior in experimental stress analysis to the baking type, brittleness of the former is markedly dominated by both basic ingredients and solvents whose effects are rather complicated. Few studies have been made on solvents for lacquer coating, and recently it becomes more necessary that they should be of low toxicity and non-flammable in order to prevent peril in practical use.
The authors have principally investigated, therefore, the dependence of the brittleness, which is proportional to the strain sensitivity of the coating, on several solvents having a variation in the properties such as solubility parameter, evaporating rate, azeotropy to water, noxiousness, blushing and others.
As the result of the study the following facts have been obtained.
The threshold strain sensitivity of the coating is essentially determined by the solvent used, so that it is impossible to improve the sensitivity even if the formula of basic ingredients is made to vary. The sensitivity is inversely proportional to the specific volume of the coating which decreases as the fine crystallization of abietic acid employed as a basic ingredient takes place. The coating using carbon disulfide does not show any crack development in the direction of the principal stress on the surface of the specimens, but it easily blushes during application.
Low toxic and non-flammable trichloro-ethylene is most satisfactory among the solvents tested although it is inferior to carbon disulfide in regard to the strain sensitivity.

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