The Research On One-Bath Dyeing Of Wool/Poltester Blend

Acid dyes/disperse dyes two bath dyeing method was used as a traditional dyeing process for wool/polyester blended fabrics.In this method,the two kinds of dyes was applied for wool and polyester respectively,which can obtain a good dyeing effect.However,this method has some disadvantages such as high energy or water consumptions and high damage to the wool fiber. Compared to the former method,the acid dyes/disperse dyes low temperature carrier one bath dyeing method has attracted more and more emphases nowadays due to its short dyeing time,high produce efficiency and low energy consumption.However,this method also has two major defects: one is that the disperse dyes will stain on wool,the other one is that high temperature treatment for a long dyeing time will cause damage to wool.These problems have to be solved by selecting the proper dyes and dyeing auxiliaries and find out the optimized condition for the dyeing process.In this paper,these problems are investigated.The staining property to wool and dyeing performance to polyester of disperse dyes are studied according to the characters of wool and polyester.The suitable low temperature dye carrier and dispersant are selected,and the optimized dyeing conditions are obtained.The amount of carrier Sera Gal PEW is 3g/L;the concentration of dispersant NNO is 2g/L;the dyeing pH is around 4-5;100℃and 60min;liquor ratio is 1:40. Fabric dyed in this condition can obtain a four grade of both washing fastness and dry or wet rubbing fastness.In addition,the fabric can obtain good dye permeability.Compared to two bath dyeing method,our method has the advantages of time,energy and water saving and high produce efficiency.In this paper,the dyeing thermodynamics and dyeing kinetics are studied and the reason for disperse dyes staining on wool is analyzed.The experimental results showed that the affinity between disperse dyes and wool causes the staining and the absorption isotherm is the combination of Langmuir isotherm and Nernst isotherm.The dying temperature and carrier used have great effects on dyeing rate and dyeing equilibrium for disperse dyes to wool and polyester fibres.With the dyeing temperature rising,the affinity of dyes to fibers,dyeing uptake and the dye diffusing resistance in the fabric all decreased,while the dyeing speed increased.On the other hand,when certain amount of carriers were added into the dyeing bath,the affinity of dyes to fibers could be increased,which enlarged the difference of dye affinities between wool and polyester,and could effectively deduce the staining of disperse dyes on wool.The relevant stain rate of disperse dyes on wool with different structures were determined and the dye I/O values were also calculated.The results indicated that the dyeing affinities of anthraquinone disperse dyes to wool was quite low,resulting in a relative light staining of disperse dyes on wool.After dyeing,acid reduction cleaning agent can be selected to wash out the disperse dyes stained on wool fibers and to increase the dyeing wet fastness.In this paper,the affect of environmental friendly wool protective agent,Breviol WSM on the surface morphology,damage degree and mechanical property of wool are studied.The mechanical property of wool,the alkali solubility and the SEM are characterized.The results showed that the protein derivatives of wool protective agent can cover the surface of wool fibers,and enhance the binding force between the scales to prevent the cell membranes swelling and hydrolyzing. Compared with normal dyed wool,the damage of breaking strength and the break elongation as well as the alkali solubility of the dyed wool are all reduced remarkably by using wool protective agent Breviol WSM in the dyeing bath.