Preparation Of Microcapsule Dyes And Applied Research In Wool Dyeing

As is known to all,reactive dye(Lanasol CE)is combined with wool fiber by strong covalent bonding in the dyeing process,but a large number of dyeing wastewater will be produced by the complicated and lengthy dyeing process in the conventional wool dyeing process,it not only cause serious harm to the environment,but also need to spend a lot of manpower and material resources to dispose dyeing wastewater.In order to solve this problem,the microcapsule dyes are suitable for wool dyeing were prepared through the research of microcapsule technology,and the purpose of energy saving and emission reduction was achieved by microcapsules dyeing for wool fabric.Firstly,the feasibility of soybean lecithin and microcapsules structure in wool dyeing was explored.The lecithin dye bath and micro-balloon dye bath which had equal quality between dosage of soybean lecithin and dye were prepared,and wool fabric was dyed in accordance with the process conditions,as well as the dyeing properties of two kinds of dye solution were analyzed and compared.The results reveal that the effect of binding between dyes and wool was strengthened,total bonded dye and dye fixation were promoted when the soybean lecithin was served as wall material and the microcapsule dyeing technology was used.Although the dyeing exhaustion was reduced,the vast majority of dye in the dyeing residual liquid could be filtered out when dyeing residual liquid had been through simple filter,and the effect of wastewater treatment could be achieved.Then the best preparation technology of microcapsule dyes was explored.Soybean lecithin was selected as shell material and reactive dyes Lanasol CE was encapsulated by the reverse evaporation method for the preparation of microcapsule.The entrapment efficiency was taken as the evaluation indexes and the microcapsules optimum preparation technology conditions were optimized through the single factor analysis and Box-Behnken design-response surface optimization method(BBD-RSM),and the morphology and structure of microcapsule was characterized by TEM and FTIR.The results reveal that the optimum preparation technology conditions as the organic solvent was diethyl ether of 20 m L,the quality ratio between soybean lecithin and cholesterol for 3.11:1,the quality ratio between wall material and core material for 26.3:1,and hydrated PBS buffer of 4.7 ml,and the microcapsules average entrapment efficiency was 67.64%.The microcapsule has uniform morphology and obvious core-shell structure.Next the optimum dyeing process of soybean lecithin/Lanasol CE microcapsule dyes on wool dyeing was explored.The optimum microcapsules dyeing process,combined with the conventional dyeing process,was optimized through the single factor analysis and Box-Behnken design-response surface optimization method(BBD-RSM).The results reveal that the optimum microcapsules dyeing conditions as the p H value of 4.6,dyeing time for 60 min,dyeing temperature was 90 ? and 10% owf dosage of sodium sulphate,and the K/S value of dyed wool fabric was 19.086,and microcapsules dye-fastness consistent with conventional dyeing process.Finally the recycle of microcapsules dyeing wastewater was explored.The wastewater CODcr,BOD5 values and absorbance were measured by comparing with the conventional dyeing,and the recyclability of microcapsules dyeing wastewater was analyzed.The results reveal that the degree of contamination for microcapsules dyeing wastewater was far less than the conventional dyeing,and the microcapsules dyeing wastewater could be recycled for 10 times at least,and a lot of dyeing water consumption and wastewater treatment costs could be economized.Revealed in this study are that soybean lecithin/Lanasol CE microcapsule dyes can be used in wool dyeing completely with lower dyeing temperature,its dyeing wastewater can be recycled by simple processing,and the goal of energy conservation and environmental protection was achieved.