Study On Hetero-Bifunctional Reactive Dyes With Ethoxy-Substituted Triazine

When the cotton is dyed with reactive dyes,one of the problems is that the fixation is low.In order to solve the problem of low fixation and achieve high fixation while dyeing under mild conditions,we designed in this thesis to improve the reactivity of reactive groups by changing the structure of reactive groups,thereby improved the fixation.Ethoxyl group was designed to introduce into triazine to increase its reactivity,which realized good activity matching with ?-hydroxyethyl sulfone sulfate in one molecule.Thereby,the fixation of mono-schlorotriazine/hydroxyethyl sulfone sulfate bifunctional reactive dyes(KM-type)and mono-schlorotriazine monofunctional reactive dyes(K-type)on cotton was improved,and dyeing under mild conditions with high fixation was realized.A new kind of reactive dyes containing 2-ethoxyl-4-chloro-s-triazine was obtained.26 dyes with orange,red,blue and yellow colors were synthesized,and characterized by UV-Vis,MS and FT-IR.Different chromophores were selected to expand the chromatogram,and the yields were all above 75%.Synthesized dyes were dyed at 60?,75?,90?,respectively,and K/S of the dyed cotton could reach 1/1 color depth.After the introduction of ethoxyl,the optimal fixation temperature of J-acid and ?-acid series dyes was reduced to 75?,and that of H-acid series,pyrazolinone sulfonic acid series and Cassella acid series dyes was reduces to 60°C.Exhaustion and reactivity of the ethoxyl-containing KM-type dyes were all over 90% at the optimal temperature,and fixation was over 87%,which was higher than arylamine and alkylamino substituted contrast dyes.The exhaustion,fixation and reactivity of the ethoxyl-containing K-type dyes were also improved.Compared with contrast dyes,the wash-fastness and light-fastness were basically unchanged after the introduction of ethoxyl,and only the wet rub-fastness of H-acid series was reduced by 1 grade.