Premium
The leveling of thermosetting waterborne coatings. Part II: Drying of coated wet films
Author(s) -
Kojima Shunji,
Moriga Toshinori
Publication year - 1995
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760351305
Subject(s) - thermosetting polymer , materials science , composite material , polymer science
Evaporation behavior of water/solvent blends was estimated using the universal functional activity coefficient, UNIFAC, method. The evaporation rate from a free surface of a waterborne coating, WBC, containing a co‐solvent was experimentally determined. These results were used to estimate the evaporation rate from wet films of a WBC containing a variety of co‐solvents with a range of initial thickness. Knowing the composition of the WBC during the drying process, the change in the viscosity and the surface tension was determined. The results strongly support the development of a surface tension gradient in the film. It is also suggested that a surface tension gradient would accelerate the leveling of the ribs if a proper co‐solvent were employed.