PROCESS OF PREPARING THE NATURAL DYE OF URUCUM FOR DYEING ON POLYESTER FABRICS

摘要

process of preparing the natural annatto dye for dyeing polyester fabrics. the present invention patent refers to a process for preparing the natural annatto dye, acidified and dispersed in aqueous medium, for dyeing polyester fabrics. the process has as a differential the acidification of the solution of the natural annatto dye, making it partially soluble (due to acidic ph) and, thus, bringing its characteristics closer to a dispersed dye. dyeing is then carried out at a temperature of 115 ° C and time of 15 minutes, without any specific prior treatment on the polyester fabric.