Separation analysis of resin mixtures for paint was examined by thin layer chromatography and the following results were obtained.
(1) Nineteen resin mixtures were prepared by the mixing of two different resin solutions. Chromatography of these resin mixtures were carried out on silica gel plate using various solvent systems as the developer.
The separation of resin mixtures were possible by using iso-propyl alcohol-acetone (6 : 4, v/v) and methyl alcohol-ethyl alcohol (1 : 1, v/v) as the developing solvents.
(2) Detection reagents must have selectivity for coloring resins because their Rf values were variable when resins having different molecular weight or composition were developed.
Each resin was colored characteristically when iodine vapor, Ehrlich reagent and diphenylcarbazone reagent were used in combination as the detection reagents and resins were possible to distinguish respectively.
(3) The detection limit were between 10
-6g and 10
-5g depending upon the kind of resin.
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