Estimation Method for Intrinsic Drying Rate of Fick-Type Coating

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  • Fick型塗膜の固有乾燥速度とその推定
  • Fickガタ トマク ノ コユウ カンソウ ソクド ト ソノ スイテイ

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Abstract

Coating is composed of a base plate and a coated layer on it. In this study, we examined whether the drying rate of the coated layer alone, named “the intrinsic drying rate of coating,” may be a standard drying rate of coating. Since a precise value of the intrinsic drying rate cannot be obtained from drying experiments, a series of computer simulations was performed for a binary Fick-type coating of polyvinylacetate–toluene, and the drying rate curves of the coated base plate and the intrinsic drying rate curves were obtained. As a result, each intrinsic rate curve showed a larger value than that of corresponding rate curve with base plate, and the difference was remarkably larger than that of the polyvinylalcohol–water system. Next, each intrinsic rate curve was estimated by the previous estimation method and the corresponding simulated rate curve with base plate. The method is a mutual estimation one for coating drying rate between base plates with different heat capacity. The estimated result showed a good agreement with the simulated one, but the degree of agreement was inferior to that of the polyvinylalcohol–water system.

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