Banca de DEFESA: SAFIRA MOURA BARROS

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
DISCENTE : SAFIRA MOURA BARROS
DATA : 16/03/2021
HORA: 14:30
LOCAL: videoconferência na plataforma RNP (sala PEI-UFBA)
TÍTULO:

Optimization of the dyeing process of natural and synthetic fibers using protic ionic liquids

PALAVRAS-CHAVES:

Textile industry, Dyeing, Cationization, Protic ionic liquid, Reactive dye.

PÁGINAS: 187
GRANDE ÁREA: Engenharias
ÁREA: Engenharia de Produção
RESUMO:

The textile dyeing industry generally uses traditional processes, which tend not to be
environmentally friendly. This industry is the most chemically intensive, and the second
polluter of clean water (after agriculture). Traditionally, they use large amounts of water
together with large quantities of chemical additives, which can have a huge environmental
impact and could be harmful to human health directly or indirectly. Recently, papers
has been published in the scientific literature in order to improve the sustainability of
the process, focusing in finding alternative solvents and techniques to reduce the amount
of water and chemicals used, as well as improve the quality of the dyeing and keep the
cost of the process low. Ionic Liquids come into the light as new versatile media for many
chemical syntheses, enzymatic catalysis and green engineering processes. They are made
of a collection of positive and negative ions, but unlike conventional molten salts, these
materials are liquid at room temperature. The group of protic ionic liquids show additional
advantages, because of low cost, usually biodegradable and simple synthesis, so they are
known for their acid-base reaction mechanism, corresponding to the formation of those
salts. In this work, it was optimized an alternative procedure available in open literature
to dye different types of fabrics with reduced number of dyeing agents: textile dyes, a
cationizer pretreatment fiber technique, and protic ionic liquids as solvent or additive in
aqueous solution. Therefore, the objective is to reduce environmental impact and increase
the dye quality of this procedure, which was used to dye six different fibers in order
to analyzed the effectiveness of the dyeing agents in terms of different dyeing quality
measurements such as absorption of color and wash fastness standards of the dyed fiber.
Cytotoxicology assays of the fabrics treated with protic ionic liquids were also evaluated
and they did not presented any toxicology. The tests results with protic ionic liquids as
the only additive with 30% m/m in aqueos solution shows color strenght until 250 times
bigger than the alternative procedure available in open literature, and cationization played
a fundamental role in color fixation of the fibers. Furthermore, an innovative proposal is
presented using reactive dye as a “universal dye”, aiming at a more sustainable and safe
profile for the textile industry.

MEMBROS DA BANCA:
Externo(a) à Instituição - BRUNA GALDORFINI CHIARI ANDREO
Externo(a) à Instituição - ELIANE TROVATTI
Externo(a) à Instituição - FABIA REGINA GOMES RIBEIRO
Externo(a) ao Programa - 1894417 - MIGUEL ANGEL IGLESIAS DURO
Externo(a) à Instituição - REBECCA DA SILVA ANDRADE