Solvent retention in phenolic varnish films

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Journal titleJournal of the Oil & Colour Chemists' Association
Pages977988; # of pages: 12
Subjectphenolic varnish; solvents; drying; water absorption; phenolic varnish; solvent retention; gas chromatography; infra-red spectroscopy; Buildings
AbstractWhen coatings are air-dried, small amounts of solvent are retained in the film because drying takes place most rapidly at the surface. Hence, coatings that dry the fastest trap the most solvent, and evacuation, even at high vacuum, does not remove all the retained solvent. Removal is accomplished only after several cycles of water absorption and desorption. The amount of solvent trapped in oil- modified coatings is probably not large enough to have much effect on the physical properties of coatings. When the total solvent removed by both evacuation and desorption is calculated on the basis of the air-dried film weight, 15- and 20-gal tung oil phenolic varnishes contained 0.91 and 1. 04 per cent solvent, respectively. This is much lower than the quantities retained in cellulose nitrate and vinyl lacquers. The slowest drying varnish tested, 40-gal dehydrated castor, retained 0.56 per cent solvent. The amount, however, is sufficient to change drastically the water absorption values obtained when precise measurements are made on coatings that do not absorb much water. This effect will be discussed in detail in a second paper concerned with clear coatings for exterior wood.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number11645
NPARC number20374597
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Record identifier973b578b-e3e4-47fc-9ac2-5c0d15e503a9
Record created2012-07-23
Record modified2016-05-09
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