Abstract
The performance of local clay-titanium dioxide core-shell extender pigments in alkyd paints has been studied. The physico-mechanical properties of the prepared alkyd paints were evaluated according to ASTM measurements. The effects of various environmental and corrosive factors on the paints were also studied. The study showed that the alkyd paint samples formulated using the core-shell pigments generally had low specific gravity (1.30 – 1.38), an indication that more of the core-shell pigments can be incorporated into the alkyd paints with considerable cost savings. The dry film thicknesses of the paint samples falls within 0.24 - 0.39 mm, suggesting that the samples will perform well as anticorrosive coatings and their adhesion properties are generally good, showing that they can withstand abrasive and corrosive agents. The core-shell extender pigments formulated paint samples were observed to exhibit the best dust-free, tack-free, and through dry times compared to TiO2 paint formulation. The formulated paint samples generally performed well on exposure to rain and sunlight as well as in distilled water, 2% Na2CO3, and 2% H2SO4 with only TiO2 paint formulation exhibiting rust. The good paint performance characteristics obtainable with the core-shell extender pigments are enough evidence to justify their utilization in the surface coatings industry. The performances of these core-shell extender pigments in alkyd paints have shown that they combine the properties of both the clays and titanium dioxide, and have the potential to overcome their disadvantages.
Highlights
Extenders, which are sometimes referred to as extender pigments are an integral part of almost all coating formulations
The high TiO2 content in the prepared core-shell extender pigments is an indication of the presence of titanium dioxide and titanium deposited on the clays
The particle morphology of the core-shell pigments obtained from scanning electron microscope (SEM) shown in Figure 1 and Figure 2 indicates that the Obowo and Ihitte-Uboma core-shell extender pigments are nodular shaped structures of different sizes
Summary
Extenders, which are sometimes referred to as extender pigments are an integral part of almost all coating formulations. Mica, kaolin, and feldspar are widely used in coatings as extender pigments and they contribute significantly towards modifying various coating properties such as flow characteristics, settling tendency, abrasion resistance, etc. The pigment that is extended is titanium dioxide (TiO2) which is a prime pigment widely used in coatings. These extenders separate the individual TiO2 particles to enhance its opacifying effect. The use of extenders in coatings has the profound disadvantage of low hiding power while titanium dioxide is a photochemically active compound. Paint formulators and technologists have begun to find technically and economically viable extenders for use in coatings, in order to bring down the cost of coatings to acceptable limit
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