Formulating Water Based Paint with Red Natural Dyes
Keywords:water‐based paint, Caesalpinnia sappan, red dye, natural dye
The study aims to formulate and investigate the quality of water?based paint with red natural dyes. The red natural dyes was extracted from Caesalpinia sappan L. wood dissolved with water in a reactor with a capacity of 25 L. The extracted dyes were then spray dried into red powder dyes and subsequently formulated into paints by mixing them with full acrylic resin, water, dispersant, defoamer, and thickener. The powders were characterized using ultraviolet?visible spectrophotometry and Fourier transform infrared test. The results show that red powders show an absorbance spectra peak at wavelength of 400?600 nm and the functional groups of C?H, C?O?C, C?OH, C = C and C = O indicating functional groups in Brazilein dyes. The formulated paint has a viscosity, hiding power, total solid, touching drying time, hard drying time, and glossy level of 3800 mPas, 8.51 m²/kg, 54,6%, 25.09 minutes, 47.56 minutes, and 74,4 GU, respectively. The quality of the water?based paint formulated with red natural dyes has complied SNI standard 3564: 2009 for paint.