Study on Pigment-Extender Effect of SomeNigerian Clays and CalciumCarbonateinEmulsion Paint

Abstract

This work investigated the pigment-extender effect of Aningene clay, Nwangene clay and calcium trioxocarbonate(iv) in emulsion paint. The clay samples were prepared by washing, sedimentation, drying, grinding and sieving. The clay particles obtained were calcined at 750 °C. The calcined and uncalcined clay were used to formulate emulsion paint. Physical and performance properties of the produced paint weredetermined. The compositional and morphological analyses were also carried out onthe calcined clays via X-ray fluorescence and scanning electron microscopy. The XRF showed that the Aningene clay and Nwangene clay contained silica (SiO2) and aluminum oxide (Al2O3) percentages of 43.02%, 66.20% and 23.92%, 27.50%respectively. The Aningene clay also contained 6.08% of iron oxide (Fe2O3), the rest of the constituents is in small quantities for both clays. The SEM micrograph of the calcined clays showed that the clay particles are 50 um in size. The physical tests showed that the pH and specific gravities of the clay formulated paint were lower than that of the calcium trioxocarbonate (IV) formulated paint. While the viscosities were also higher than that of the calcium trioxocarbonate (IV) formulated paint. The performance tests showed that the opacity and spread rate of the clay formulate paints were lower than calcium carbonate formulated paint. Also, none of the clay formulated paints chalked on drying. The Aningene clay formulated paint gave better paint property than the Nwangene clay formulated paint. Hence, the Aningene clay should be used in production of emulsion paint and Nwangene clay should be used in the production of harsh paints.