Cure Behavior of Two-component Acrylic Urethane Coatings

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  • 二液型アクリルウレタン塗料の硬化挙動
  • 2液型アクリルウレタン塗料の硬化挙動-1-HMDI系ポリイソシアネートの反応性
  • 2エキガタ アクリルウレタン トリョウ ノ コウカ キョドウ 1 HMDIケイ
  • (I) HMDI系ポリイソシアネートの反応性
  • (I) Reactivity of a Biuret of HMDI with Acrylic Polyol

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Abstract

The catalytic effects of carboxylic acid and dibutyl tin dilaurate (DBTDL) on the reaction kinetics of two-component acrylic urethane coatings were discussed. Reaction of a biuret of hexamethylene diisocyanate with acrylic polyol in the film state follows the second order reaction, and the temperature dependency of the rate constants fits for the Arrhenius equation. It is clearly observed that carboxylic acid shows strong catalytic effect on reactivity of isocyanate group and the rate constant increases with increase incarboxylic acid contents for the system without DBTDL. However, the effect of DBTDL on the reactivity of isocyanate groups for the system having carboxylic acid is much less than that of the system without carboxylic acid.

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