Ocena učinkovitosti razbarvanja monoklorotriazin/vinilsulfonskih reaktivnih barvil z redukcijskim razbarvalnim sredstvom
DOI:
https://doi.org/10.14502/tekstilec.65.2022062Ključne besede:
reaktivno barvilo, reduktivno razbarvanje, temperatura, indeks beline, učinkovitost razbarvanjaPovzetek
Industrija mokre obdelave se srečuje z raznolikimi težavami, kot so napačni in neenakomerni barvni odtenki, barvni madeži na površini obarvanega blaga in težavami, ki nastanejo med barvanjem in poznejšo obdelavo tekstilnih materialov. Razbarvanje je postopek, ki zmanjša napako pri barvanju in s tem omogoči ponovno uporabo barvanega blaga. Namen tega članka je oceniti učinkovitost sredstev za razbarvanje in kakovost razbarvanih bombažnih pletiv z uporabo bifunkcionalnih (monoklorotriazinskih/vinil sulfonskih) reaktivnih barvil. Prvič je bila za barvanje pletiv v dveh različnih odtenkih uporabljena trikromatska kombinacija barvil Drimarene Yellow CL2R, Drimarene Red CL5B in Drimarene Blue HFRL, in sicer za svetli odtenek 0,3 % barvila na maso pletiva in za temni odtenek 3,0 % barvila na maso pletiva. Zato je bilo razbarvanje izvedeno z različnimi koncentracijami sredstev za razbarvanje (natrijev hidrosulfit in natrijev hidroksid) in spreminjanjem temperature postopka. Razbarvana pletiva so bila ocenjena glede na odstotek zmanjšanja mase, odstotek znižanja trdnosti, indeksa beline in učinkovitosti razbarvanja. Ugotovljena je bila relativno boljša učinkovitost razbarvanja s koncentracijo 5 g/L natrijevega hidrosulfita in 5 g/L natrijevega hidroksida pri 100 °C. Pri teh pogojih sta bili vrednosti indeksa beline in učinkovitosti razbarvanja ustrezni ob minimalnem odstotku zmanjšanja mase in trdnosti. Učinkovitejše razbarvanje je bilo doseženo pri pletivu s svetlim odtenkom (0,3 % barvila na maso pletiva) kot pri pletivu s temnim odtenkom (3,0 % barvila na maso pletiva).
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Avtorske pravice (c) 2023 Mahfuza Pervin, Sanjida Sultana, Fahmida Faiza Fahmi, Zinia Yasmin, Sushama Saha Swati

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