Effect of solvent on residual strain in clear epoxy coatings

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Journal titleJournal of the Oil & Colour Chemists Association
Pages230236; # of pages: 7
Subjectepoxy resin; solvents; strain; epoxy coatings; clear coating; catalysed coating; solution; epoxy resin; amine hardener; shrinkage; solvent retention; evaporation rate; strain; Buildings
AbstractCoatings were formed from solutions of solid and liquid epoxy resins, cured with diethylenetriamine. The residual internal strain was measured and found, in all cases, to be considerable. The residual strain in coatings formed from the faster evaporating solvents showed no variation with coating thickness, but exhibited a small dependence on the concentration of the coating solution. These coatings, like lacquers, are considered to solidify whilst still in a thermoplastic state, with subsequent crosslinking. Coatings cast from a very slow-evaporating solvent had a residual strain which increased greatly with coating thickness, because they solidified owing to the formation of a crosslinked network. Liquid epoxy resin formed coatings with much higher residual strain and poorer adhesion when cast from solution than when applied as a solventless formulation.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number18584
NPARC number20331617
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Record identifier237c7ffa-11f7-41a7-b8bf-3317a8eeb8f3
Record created2012-07-18
Record modified2016-05-09
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