Influence of the incorporation of granite waste on the hiding power and abrasion resistance of soil pigment-based paints

The large amount of solid wastes generated in the processing of ornamental stones is a matter of concern for the society. A possible solution is the incorporation of those wastes in civil construction paints, in order to promote improvements in their properties, and contributing to the sustainable development. The purpose of this paper is to study the influence of the granite waste, actuating as mineral filler, on the performance of poly vinyl acetate latex paints produced with soil pigments. It is emphasized that both the materials used and the manufacturing process adopted comply with the requirements of a social technology. To manufacture the paint samples, two types of soils were selected, and an experimental planning of mixtures was defined with varied proportions of soil, granite waste and poly vinyl acetate (PVA) resin. In such planning, the water ratio varied in each mixture in order to keep the viscosity within a constant range, considered ideal to apply the product. Next, experiments were performed to set the hiding power and the abrasion resistance of each mixture. It was verified that, in both types of soils used, the paints presented a better hiding power as the granite waste was added. Such result can be explained by the characteristics of the granite waste that promoted a gradual increase in the solid content of the mixtures. However, the waste and PVA interaction caused a decrease in the abrasion resistance of the paints, which is possibly due to the increase in the roughness of the paint film plus the increase in the pH of the mixture. It was also observed that none of the produced samples simultaneously complied with the hiding power and abrasion resistance of Brazilian standard specifications. The paint film that presented the best performance is constituted by 71% of granite waste and 29% of PVA resin. (C) 2019 Elsevier Ltd. All rights reserved.