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Crosslinking a hydroxyethylsulphonyl dye on cotton to achieve covalent fixation in a long‐liquor process
Author(s) -
Lewis D M,
Yao J
Publication year - 2000
Publication title -
coloration technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.297
H-Index - 49
eISSN - 1478-4408
pISSN - 1472-3581
DOI - 10.1111/j.1478-4408.2000.tb00048.x
Subject(s) - fixation (population genetics) , covalent bond , process (computing) , chemistry , pulp and paper industry , process engineering , combinatorial chemistry , computer science , organic chemistry , biochemistry , operating system , engineering , gene
A heterobifunctional [dichlorotriazine and vinylsulphone (DCT‐VS)] reactive crosslinker, 2,4‐dichloro‐6‐{ρ‐[(2′‐sulphatoethyl)sulphonyl]phenylamino}‐1,3,5‐triazine (DC‐SES) was synthesised and coapplied with nicotinic acid to covalently fix hydrolysed Cl Reactive Black 5 (HBB) (hydroxyethylsulphonyl dye) to cotton in a long‐liquor process. It is suggested that a very active quaternised nicotinic acid ammonium salt of DC‐SES was generated in situ , which reacts readily with HBB and cellulose leading to dye fixation. Further dye fixation can be obtained by the addition of alkali at 60 °C; the final fixation value from this system is very good. Application of this system as an aftertreatment in the conventional Cl Reactive Black 5 dyeing bath, results in 10–15% higher exhaustion and fixation values compared to the usual dyeing procedure.