Banca de QUALIFICAÇÃO: CAMILA NILMA DE LIMA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : CAMILA NILMA DE LIMA
DATE: 27/12/2019
TIME: 14:00
LOCAL: Centro de Tecnologia
TITLE:

OPTIMIZATION OF POLYESTER FIBER DYEING PROCESS USING COUMARIN AS CARRIER

KEY WORDS:

Coumarin, carrier, dyeing, polyester, low temperature

PAGES: 95
BIG AREA: Engenharias
AREA: Engenharia Química
SUBÁREA: Tecnologia Química
SPECIALTY: Têxteis
SUMMARY:

The textile industry is largely responsible for generating effluents, and polyester dyeing, the most widely used fiber in the world today, is a major contributor, given that its conventional process typically makes use of highly toxic chemicals (dyes, surfactants, acids, carriers, etc.) and / or extremely high temperatures. In this context, this work aims to optimize the dyeing process of polyester fabrics at low temperatures with the aid of coumarin as a non-toxic alternative carrier, making use of a statistical tool. This work also proposes the comparative analysis of the conventional dyeing process (at 130 ° C) and at lower temperatures with and without the use of an alternative carrier, evaluating the color strength, uniformity and color resistance of the dyed substrates. The samples were characterized for mechanical, morphological, chemical and coloristic properties before and after dyeing. Technologies such as Dynamometer, Scanning Electron Microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Dispersive Energy Spectroscopy (EDS), Reflectance and Absorbance Spectroscopy were used. The results showed that with the use of coumarin it is possible to increase the dyeing color strength by about five times at 90 ° C and to increase the dyeing color intensity at 100°C approximately three times when compared to dyeing at the same temperatures in the absence carrier, with excellent uniformity. However, at temperatures close to 130 ° C, very similar results are obtained in coumarin and non-coumarin dyed samples, showing that the kinetic energy of dye molecules and the opening of amorphous zones at elevated temperatures are essential for greater dye diffusion. into the fiber.

BANKING MEMBERS:
Presidente - 2614285 - KESIA KARINA DE OLIVEIRA SOUTO SILVA
Interno - 2052404 - FERNANDO RIBEIRO OLIVEIRA
Interno - 2941160 - JOSE HERIBERTO OLIVEIRA DO NASCIMENTO
Externa à Instituição - CÁTIA GUARACIARA FERNANDES TEIXEIRA ROSSI - FANEC