The Synthesis Of An Cationic Proteic Color Deepener And Its Application On Wool Dyeing

Conventional wool dyeing is a degradative process involving high temperature for long periods with the result of a deterioration of properties. Acidic mordant dyeing process has the problem of chromium pollution while Lanasol black CE dyed samples fails to provide satisfactory color strengths. To solve the problems mentioned above, this study explored the preparation and application of a cationic protein agent named color deepener. Color deepener is the chemical product of WLS(an original cationic agent) and gelatin. First of all, the effect of synthesis process on dye uptake and color strength(K/S) was analyzed to obtain an optimum synthesis process as follows:gelatin was dissolved at 40? for 0.5 hours, then m(gelatin)= 12% m(WLS), m(Na OH) = 1.25% m(WLS), reacted at 65? for 3 hours.The structure and performance of the agent was analyzed afterwards.Secondly, a new low-temperature dyeing process applicable to wool dyed with Lanasol black CE involving a sequential color deepener treating combined with a subsequent dyeing in a single bath was gained as follows: Color deepener 5%(owf),liquor ratio of 30:1, treated at 50? for 10 minutes, 6%(owf) Lanasol black CE and3%(owf) acetic acid was added, ramp to 85? and dwell for 60 minutes. After dyeing,fresh water rinsing(liquor ratio of 20:1, 40?×10min) for two times ?soaping(2g/L sodium carbonate, 1g/L soap powder, liquor ratio of 20:1, 60?×20min)?fresh water rinsing(liquor ratio of 20:1, 40?×10min) for two times.In the end, the dying performance of the new low-temperature dyeing process with Lanasol black CE and the conventional dying process with Lanasol black CE and acidic mordant black was compared. Then, the function mechanism of color deepener was discussed. The agent was subordinated to secondary dynamics model and Langmuir type of absorption thermodynamics respectively, which showed this dyeing agent was chemically absorbed into wool through chemical reaction.The results confirmed that the new low-temperature dyeing process provided reduction of 25% Lanasol black CE dyes. Satisfactory dye uptake, color strengthens,colorfastness of rubbing and soaping and reduction of alkali solubility from 20.18% to17.86% was gained comparable to that of fabrics with untreated fabrics dyed with acid mordant black conventionally. The new dyeing process was proved to be able totake place of the acid mordant black conventional dyeing process with lower pollution,energy-reduction and less damage to physical and chemical properties.