Abstract
The modification of silica performed by mechanical frictioning of dyes into its surface occurring during intensive mixing has led to stable composite pigments (Table 1). Azo dye, antraquinone, perylene and indigothiazyne derivatives were used as dyeing agents. ,,Surface crayoning of silica reduces its specific surface area, particle aggregation tendency, and the formation of structures. It also lowers the filling activity towards silicon rubber thereby altering the interphase interaction resulting in an uneven dispersion of the composite pigments in the elastomer (Table 2, 3, Fig. 2, 3). Vulcanizates filled with the modified silica exhibited an increased resistance to color changes caused by weathering, however, their mechanical resistance decreased in comparison with rubber filled with unmodified silica (Table 4, 5).
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