Caiação de superfícies: um estudo sobre a utilização do pigmento da Curcuma longa como corante em pinturas a cal

Abstract

This research aimed to analyze the effectiveness of whitewashing surfaces with natural products: the pigment extracted from Curcuma longa and linseed oil as a natural drying agent, comparing the characteristics of paints with different lime concentrations along with viscosity and drying time drying of adhesion on the surface, calculating cost-effectiveness and consumption of Carbon Dioxide used in the production of ecological paint. The problematic issue was to improve the lime painting technique by adding pigment extracted from Curcuma longa as a dye and employing linseed oil as a drying agent and waterproofing agent, obtaining a more sustainable product. In this sense, we sought to work with a descriptive methodology. Chemical laboratory techniques were used for data collection, experiment, and testing. Subsequently, the collected data were tabulated, analyzed, and discussed, to achieve a more refined perspective with more specialized knowledge, resulting in a low-cost and inexpensive cost-effectiveness with quality in the final product, aiming for sustainability for humans and the planet Earth. Three batches of paint were produced in this work, varying concentrations and/or materials, for analysis purposes. The best paint obtained was from batch 2, where a better overall application with better surface coverage was observer. A saffron coloration test was conducted by varying the concentration of calcium carbonate, and a study was also conducted on the behavior of saffron coloration in more acidic, basic, and near-neutral pH environments. A comparative analysis between a conventional 18L paint and the produced paint was conducted to cover an area of 120m². The conventional paint covers this area with three coats, costing an average of R$ 400,00. Meanwhile, the paint produced in batch 2 covers the same area with two coats, costing approximately R$ 176,00.