Avaliação das propriedades mecânicas e térmicas da poliamida 6,6 colorida com corante ácido

Abstract

This work proposes an alternative of staining the polyamides 6,6 processed by injection molding, optimizing the time, electricity and the need to clean the injection machine molds and screw. Acid dye was used to color them by immersions in the acid medium having in its composition sodium chloride, citric acid, dispersant and ammonium sulfate. For the mechanical characterization, the injected specimens were submitted to the tensile test and the properties, modulus of elasticity, limit of tensile strength at rupture and elongation were compared. For the thermal characterization, the DSC and TGA tests. The hygroscopic properties, and the effect of the dye on the mechanical properties of the polyamide were evaluated and the polyamide dyeing power was observed. In the tensile test, inferiority properties will be observed compared to the dry and wet samples, conferring intermediate values, between dry and wet samples, of tensile strength deformation. In the thermal characterization, significant differences will be found in the melting point and crystallization, being the coloration close to the dry material. The FTIR reults, the absorption of the SO3, SO2-OH, and SO2-NH2 groups characteristic of the acid dye absorbed in polyamides is evidenced. The process of polyamides staining with acid dye proved to be feasible for applications that require next mechanical properties to materials with fragile characteristics, such as dry, or with too much deformation capacity, elongation and flexibility provided by moisture.