Production process and evaluation of performance requirements of soil pigments based paint for buildings

Abstract The soil pigments are a sustainable alternative for the production of a paint to use on buildings. In this study production processes for soil pigment based paints were developed, aimed at obtaining a homogeneous and stable suspension, as well as evaluating the paints performance according to the norms established by ABNT NBR 15079:2011. Three samples of soil pigments extracted in the city of Viçosa, MG, were used. The formulations were defined using the statistic experimental mixture design. The performance of the mixtures was evaluated according to the limits of performance requirements established by ABNT. Both viscosity and the pH were measured and related to the performance. The results indicated that none of the formulations met all the performance requirements simultaneously. The pH had strong influence on performance, having defined viscosity, abrasion resistance, and the dry/wet paint hiding power. The mechanical dispersion, the "PVOH" resin and the pigments morphology determined the results obtained in this study, having become key themes to be addressed by other projects.

摘要：土壤颜料是建筑涂料制备的可持续替代原料。本研究开发了土壤基颜料涂料的制备工艺，旨在获得均匀稳定的悬浮液，并依据ABNT NBR 15079:2011标准对涂料性能进行评估。本研究使用了采自巴西米纳斯吉拉斯州维索萨市（Viçosa, MG）的3份土壤颜料样品。涂料配方通过统计实验混料设计确定，并依据ABNT设定的性能要求限值对各涂料混合物的性能开展评估。本研究测定了涂料的黏度与pH值，并分析了二者与涂料性能的相关性。结果表明，所有配方均无法同时满足全部性能要求。pH值对涂料性能具有显著影响，其决定了涂料的黏度、耐磨性以及干湿遮盖力。机械分散工艺、聚乙烯醇（PVOH）树脂以及颜料形貌决定了本研究的实验结果，相关内容亦成为后续研究亟待解决的关键课题。