Effect Of Reactive Substitutes On Reactive Tendering Of Cellulose

Reactive-dyed cellulose is prone to acid hydrolysis, which gives rise to strength loss fromrepeated commercial laundering. The phenomenon is known as “reactive tendering”, which is alsothe cause of poor wet crock fastness and severe strength loss of heavy-shade-reactive-dyed fabrics.Ever since the discovery of this phenomenon, numerous researches had been carried out. However,not a single theory has been produced to persuasively illustrate the cause of reactive tendering andits mechanism. Therefore, the goal of our research is to explore the mechanism of reactivetendering, and have it applied in the textile industry, that is, to find a solution to the poor wetrubbing fastness and lowered mechanical properties of reactive-dyed fabrics with dark shades.Firstly, this paper focuses on the hydrolysis kinetic based on the fact the reactive dyes couldaccelerate the hydrolysis rate of glycosidic bonds when grafted onto cellulose. Reactive Red120,Reactive24and two kinds of cellulose materials (cotton yarns and viscose fibers) were employed.Finally the paper has established two kinetic models of substituted cellulose hydrolysis integratingfactors of nature of substituent, degree of substitution, reactive temperatures, pH values anddegree of crystallinity. These two models comprehensively illustrate kinetic procedures ofsubstituted cellulose hydrolysis. This paper has set up a hypothesis of reactive tendering mechanism. Based on themechanism,6model subsituents were designed and synthesized. Hydrolysis of the substitutedcellulose was monitored and the hypothesis was testified. Finally the problem of reactivetendering was eliminated by designing a corresponding structure of reactive dye.In recent years, the efficient degradation and conversion of cellulose has become a bottleneck ineffective utilization of lignocellulosic biomass. Studies on the degradation and conversion ofcellulose have attracted considerable attention in the field of science and technology today. It is ofgreat significance to solving the resource, energy and environmental problems.