METHOD FOR DETERMINING COATING NV (NON VOLATILE) OF WATER PAINT AND COATING METHOD USING IT

PROBLEM TO BE SOLVED: To provide a method for determining a coating NV corresponding to a coating environment and a method for coating through adjusting the viscosity of the water paint to the coating NV. SOLUTION: The method for determining the coating NV includes the first step (S11, S12) of determining the value of ΔP which is the difference between a steam pressure of air in a coating environment and a saturated steam pressure at a coating film temperature immediately after coating, the second step (S13) of determining the value of a coating NV difference by substituting the value of ΔP determined in the first step for a relation of the predetermined value of ΔP and the coating NV difference, and the third step (S14) of determining an object coating NV by subtracting the value of the coating NV difference determined in the second step from the normal coating NV. The equation of relation of ΔP and the coating NV is one expressing, in a plurality of coating environments, the relation between the value of the coating NV difference obtained by subtracting the coating NV in a standard environment from the values of the coating NV's of a plurality of coating films obtained by applying the water paint in a normal coating NV and the value of ΔP determined in coating environments corresponding to the respective values of these coating NV differences. COPYRIGHT: (C)2009,JPO&INPIT