The interaction of the inorganic pigment and the linseed oil modified alkyd resin was studied by the method of the thermal gravimetric analysis (TGA) and differential thermal analysis (DTA).
The samples were prepared for the mixture of the pigment and linseed oil modified alkyd resin at equal weight.
Emerald green accelerated the oxidation reaction of modified oil group (reaction 1), and the thermal oxidative degradation of phthalic acid-glycerine ester group (reaction 2), ester group of oil (reaction 3) and polymerized group of oil (reaction 4) in linseed oil modified alkyd resin when determined by the method of TGA and DTA. These effects of the action of the pigment were greater on the stored sample for 500 hrs in air than on the fresh sample.
The interaction of zinc chromate and the resin was almost the same as that of Emerald green, furthermore on the stored sample for 500 hrs in air the oxidative polymerization was accelerated.
Viridian accelerated only reaction (1) on the fresh sample, but on the stored sample for 500 hrs in air it accelerated reaction (1), (2), (3), and (4).
Cadmium sulfide accelerated reaction (1), (2) and the oxidative polymerization reaction on the fresh sample. On the stored sample for 500 hrs in air the effect of the action of pigment was almost the same as that of the fresh sample.
Ultramarine had only the small effect on the reaction (1), but on the stored sample for 500 hrs in air it had the effect on reaction (1) and (2) to some extent.
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