Color Analysis Of Dye-free Coloration For Protein Fabric

Wool fabric is plump, which has good moisture absorption, air permeability, warmth, comfort. Silk fabric looks gorgeous, elegant, flowing grace. Therefore, both of them are made into high-grade textile products. But both dyeing and finishing process have the serious disadvantages of high energy consumption, high emission and high emission. With the development of society, people’s living standards are going on improving, consumers pay more attention to green, ecologic, environment day after day. These drawbacks cause consumers’attention. In response to these problems, the right direction of dyeing and finishing technology research is the one that not only complies with environmental protection, but also meets its wearability. Dye-free coloration color technology subverts the concept of the traditional dyeing technology. The fiber can be dyed under acid condition, through the color reaction of non-toxic, colorless benzaldehyde derivative with the protein fiber captive tryptophan. No dye color technology has begun to study in China.This paper main research subjects are protein fibers, it is focus on the colour reaction of active material contained by the protein fibers such as tryptophan with formaldehyde derivatives (p-hydroxybenzaldehyde,3,4-dihydroxybenzaldehyde).Discuss the influence of the color and the color series of the fabric under different reaction conditions. When adding an oxidizing agent treatment, the fabric color change will change after the selection of a non-oxidizing sulfuric acid. A few kinds of color display due to the limited types of benzaldehyde which are available now, In order to better apply this technique better, we should study the dye color with acidic dyes together. At the same time we should also test the fabric color saturation value, color difference, color fastness and levelness, fabric breaking strength and other properties.The experimental results show that:1selecting3,4dihydroxybenzaldehyde as reactant, the fabrics appeared yellow, with the increased in the amount of reactants, the color transition from yellow to brown, under the conditional of60℃. Hydroxybenzaldehyde as the reactant, the treatment at90℃, the fabric surface appeared bright yellow color, with reactant dosgase increase, the color gradually darkening. The optimal process of oxidation was:the mass fraction of sulfuric acid was1.25%, the amount of3,4-dihydroxybenzaldehyde was0.4%, mass fraction of H2O2was0.17%, after the coloration, the fabric color was dark brown. Use dye-free coloration and low liquor ratio of acid dyes mixed colors with one bath one step, the condition were that acid red dye0.02%(o.w.f), acid blue dye0.025%(o.w.f) hydroxybenzaldehyde quality score of0.2%nitrate mass fraction of2.5%, temperature90℃, time50min, the fabric appeared orange or green. The test results show that, the levelness of dye-free protein fiber was good, both rubbing fastness and washing fastness were reached4grade or above and no significant change was shown in breaking strength.