Utilización del tinte de pepa de achiote con diferentes niveles de ácido cítrico en el teñido de lana de ovino

Abstract

The objective of this research was to use annatto seed dye (Bixa orellana l.) with different levels of citric acid in the dyeing of sheep wool (Ovis aries), which was developed in the Agroindustrial Fibers laboratory of the faculty. of Livestock Sciences of the Higher Polytechnic School of Chimborazo, the acquisition of sheep wool was carried out at the Tunshi Experimental Station, where it was processed until dyed yarn was obtained, a completely random design was applied where the experimental units were distributed in 4 treatments T0: annatto dye, T1: annatto dye + 5% citric acid, T2: annatto dye + 10% citric acid, T3: annatto dye + 15% citric acid, with 4 repetitions each, where it was used 200 grams of sheep wool yarn, giving a total of 3200 grams of yarn for the research. The dyes obtained were evaluated based on two variables: pH and refractive index, and the dyed yarn was determined for light fastness (5-point scale), tensile strength (N/cm2), elongation (%) and cost benefit ($). The results obtained established that citric acid does not influence the pH (6.23) but does influence the refractive index (1.00); With respect to the physical-mechanical properties, the light fastness (5 points) presented significant differences, while the tensile strength (3417.19 N/cm2) and elongation (32.14%) did not present significance, in Regarding the economic analysis, the cost benefit was $1.16 when using 10 and 15% citric acid. Finally, it is established that 15% citric acid presented the best quality attributes in the sheep thread and it is recommended to carry out more studies on annatto and the action of natural mordants in the thread.