Application Of Computer Color Measurement And Matching To Reactive Dyeing In Lowest Water

In this paper,the reactive dyeing with lowest water were investigated to replace most of the water with anisole solvent compared with traditional exhausted dyeing.The retaining small amount of water is a "pool" to dissolve dyes and swelling cellulose fibers in the dyeing system.Compared with non-acqueous phase organic solvent dyeing,this kind of dyeing method is expected to achieve the dyeing of cellulose fibers with all commercial dyes under low-salt and low-alkali,at the same time reducing printing and dyeing waste-water and environmental effluent.In addition,due to the low liquid ratio in the dyeing system,the ineffective hydrolysis reaction of the reactive dye molecules have been effectively reduced and the utilization rate of the dyes have been improved.Finally,through the separation and recovery of organic solvent,the recycling of dye and dyeing medium can be achieved.In this paper,the computer color matching system of tri-primary reactive dyes in dyeing and mixing with less water medium were explored,and two sets of tri-primary reactive dyes with high build up compatibility were selected,which were the divinyl sulfone reactive group dyes: reactive red M-3BF,reactive yellow M-3BE,reactive blue BF and heterobi-active group(monochloro triazine-vinyl sulfone)dyes: reactive red X-6BN,reactive yellow X-4RN,reactive blue X-GN.A series of data were prepared by measuring the dye uptake rate,dye utilization rate,apparent color depth(K/S value),lifting power,leveling property and washing fastness of each dye in the lowest water madium.In addition,the dyeing data of each dye in traditional aqueous system are compared.The results show that the dyeing rate and dye utilization rate of the bi-reactive group dyes in the lowest water exhausted dyeing system are higher than those in the traditional aqueoussystem in the case of the same dye dosage.At the same time,based on these two sets of dyes,the basic database of single color and the color database of three primary colors were established,and the color matching algorithm suitable for dyeing inlowest water medium was studied.The widely used and effective optical model is the Kubelka-Munk theory,that is,the two light flux theory.On the basis of this theory,the relationship between the absorption coefficient and the wavelength,and the scattering coefficient and the wavelength are obtained.However,due to the limitations of the two-light theory,the calculated theoretical value and the actual value are different,so the basic database needs to be modified by the algorithm.The apparent color depth(K / S)-dye dosage relationship curve was fitted with a KM theory single-constant linear fitting to obtain a fitting equation,and the apparent color depth-dye dosage curve was modified by polynomial mathematical fitting,and the basic data algorithm was revised.The theoretical apparent color depth value calculated after the calculation was compared with the measured value.The error between the theoretical value and the measured value after correction was controlled below 10%.The results show that the basic database modified by the algorithm could significantly improve the accuracy of the computer color measurement.Finally,after the prediction formula,in the visible spectrum range,the reflection spectrum of the color matching sample was largely consistent as that of the standard sample,and the color reproducibility were essentially satisfactory in production.