Method for estimating frictional resistance of ship bottom coating film and method for evaluating coating film performance and device for evaluating coating film performance using said method

摘要

It is an object of the present invention to provide a method for predicting a frictional resistance increase rate of a bottom coat film which is simple, has no individual difference, and can obtain an evaluation result quickly. In order to solve the above problems, the method for predicting the frictional resistance of a bottom coat of the present invention is a method for predicting frictional resistance of a coating film coated with a bottom coat on a substrate, according to JIS B 0601: 2001 (ISO 4287: 1997) Rz (maximum height roughness), Rc (average height of roughness curve elements), Ra (arithmetic mean roughness), Rq (square root mean square roughness), RZJIS Average roughness), and calculates the frictional resistance increase rate FIR (%) from the mirror surface by the following equation (1). [Equation 1] (Here, the coefficient C is a constant depending on the kind of the roughness height R and the frictional resistance test method, and the roughness measurement and the frictional resistance test are performed at a constant evaluation length for a plurality of bottom coating films having different roughnesses beforehand, , The average length RSm as a roughness curve element, and the frictional resistance increase rate FIR (%) are obtained from the relationship of Equation 1).