| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for predicting the time of deterioration of a paint film occurring after a long-term weathering test from the result of a short-time weathering test. SOLUTION: This prediction method of deterioration of the paint film is characterized as follows: the surface shape of each paint film is measured by a scanning probe microscope by using a plurality of paint films having different deterioration times in the weathering test, to thereby acquire the average surface roughness on the surface; a mathematical expression for showing the relation between the average surface roughness and the deterioration time is acquired from numerical value information of the average surface roughness acquired on each paint film and the deterioration time of the paint film; and the average surface roughness is substituted for the expression to thereby determine the time corresponding thereto. The prediction method of deterioration of the paint film is also characterized by using following expression (1) or the expression (2) as the mathematical expression. The expression (1): R=αt+β, the expression (2): R=βe<SP>αt</SP>, wherein R is the average surface roughness, t is the deterioration time; andαandβare regression coefficients in each expression. COPYRIGHT: (C)2005,JPO&NCIPI
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