The main purpose of this study was to investigate the effects of different types and concentrations of mineral extenders on some major properties of long oil alkyd paint with the main pigment of titanium dioxide (TiO2). To this end, a fraction of TiO2 was replaced with extenders including kaolinite, talc, dolomite, and barite. Moreover, adhesion, bending test, and coating quality were measured once the given extenders were added to the formulation. The results revealed that adding these extenders to the formula had led to no significant changes in adhesion, bending test, as well as coating quality. In addition, drying time, reflection, total solvent used, milling time, and hiding power were considered as some parameters monitored during the use of different types of extenders. The findings also confirmed that replacing 5 and 7 wt.% of TiO2 with different extenders could have an adverse effect on reflection and hiding power. However, milling time and total solvent used had increased. Moreover, samples such as kaolinite + calcium carbonate (CaCO3) (H-1), kaolinite + talc (H-2) and kaolinite + nano clay (NC) (H-3) were prepared to investigate the effect of hybrid extender content on major properties of the paint. The results revealed that milling time and solvent weight had augmented and the paint including kaolinite + NC (H-3) showed the highest level of milling time (420 min) and solvent weight (63.9 g) among others. However, drying time and reflection did not show any significant difference. In addition, the findings confirmed the positive effect of the hybrid extender system on abrasion properties of the long oil alkyd paint.

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