In 1997 Dystar screened out some of the Levaflx EA dyes, which are a class of difluoro-chloropyrimidine reactive dyes. Since the electronegativity of the fluorine atoms at the 2 and 4 positions is greater than that of the chlorine atom, the density of electron clouds at the carbon atoms at the 2 and 4 positions on the pyrimidine ring is reduced and the reactivity is strong. Its reactivity is about 128 times larger than that of monochlorotriazine, and the fixation rate is 80%~90%. Because the fluorine atoms are separated after bonding with the cellulose fibers, the density of the electron cloud on the pyrimidine core is relatively high. Therefore, the dye-fiber bond is quite stable, and it is resistant to acids and alkalis, and the hydrolysis constant after bonding with the fibers is very low.
Due to the high activity of difluoro chloropyrimidine and the high fixation rate, it contains a double active group, so the molecular weight of this type of dye is relatively small, and the amount of sulfonic acid groups on the dye molecules can be reduced accordingly to satisfy a certain solubility. The amount of salt used as an accelerating agent during dyeing is less, and it is a low-salt type reactive dye. At the same time, Dystar also introduced a new dyeing process, the Levafix OS series (low Glauber's salting method. It features a reduction of 2/3 Glauber's salt dosage, a shortened process flow, a bath ratio of 1:10, lightening of the drainage load, and dyeing It has high solubility and excellent leveling properties, but the synthesis of 2,4,6-trifluoro-5-chloropyrimidine, an intermediate for the manufacture of such dyes, is very complicated, making its price too low.
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Due to the high activity of difluoro chloropyrimidine and the high fixation rate, it contains a double active group, so the molecular weight of this type of dye is relatively small, and the amount of sulfonic acid groups on the dye molecules can be reduced accordingly to satisfy a certain solubility. The amount of salt used as an accelerating agent during dyeing is less, and it is a low-salt type reactive dye. At the same time, Dystar also introduced a new dyeing process, the Levafix OS series (low Glauber's salting method. It features a reduction of 2/3 Glauber's salt dosage, a shortened process flow, a bath ratio of 1:10, lightening of the drainage load, and dyeing It has high solubility and excellent leveling properties, but the synthesis of 2,4,6-trifluoro-5-chloropyrimidine, an intermediate for the manufacture of such dyes, is very complicated, making its price too low.
Other low-salt reactive dyes include Kayacion E-LE conc, developed by Nippon Kayaku Co., Ltd. in 1999. It is a medium-dark and eco-friendly dye. E-LE means "Exhaustion" and "Low Electrolyte." Use low electrolyte when exhausting. This set of reactive dyes has high affinity and reactivity and can achieve high dyeing and fixation rates. The general fixation rate is 78%.
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