COATING FILM QUALITY PREDICTION METHOD

To provide a coating film quality prediction method that has a high reliability with fewer evaluation man-hours.SOLUTION: A coating film quality prediction method is a method for predicting post-curing quality of a coating film, in a coating material including a base material and the coating film provided on a surface of the base material, includes the steps of: preparing a test piece 1 including a test base-material 11 and a pre-curing test coating-film 12 provided on a surface of the test base-material 11; performing rigid pendulum measurement on the test piece 1 so as to measure a degree of crosslinking of the test coating-film 12 when heating the test piece 1 to cure the test coating-film 12; determining conditions for a baking temperature and a baking time of the test coating-film 12 in which the degree of crosslinking is within a predetermined range, based on a heating temperature and a heating time of the test piece 1 and the degree of crosslinking; and predicting, based on the conditions, the post-curing quality of the coating film.SELECTED DRAWING: Figure 7 【課題】より少ない評価工数で高い信頼性を有する塗膜品質予測方法を提供する。【解決手段】塗膜品質予測方法は、基材と、該基材の表面に設けられた塗膜と、を備えた塗装材における該塗膜の硬化後の品質を予測する方法であって、試験用基材１１と、試験用基材１１の表面に設けられた硬化前の試験用塗膜１２と、を備えた試験片１を準備する工程と、試験片１について剛体振り子型粘弾性測定を行い、試験片１を加熱して試験用塗膜１２を硬化させたときの試験用塗膜１２の橋架け形成度を求める工程と、試験片１の加熱温度及び加熱時間と、橋架け形成度と、に基づいて、橋架け形成度が所定範囲となる試験用塗膜１２の焼付温度及び焼付時間の条件を求める工程と、条件に基づいて、塗膜の硬化後の品質を予測する工程と、を備える。【選択図】図７