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In this paper, a new type of application in the vat dyes on cotton knits, polyester knitted disperse dyes, reactive dyes on cotton knitted fabric, acrylic knitted cationic dye stripping agent. The traditional stripping process, the existence of this or that problem. Such as vat dyes on cotton fabric, polyester fabric, disperse dyes, reactive dyes on cotton fabric stripping common hydrosulfite stripping process. Hydrosulfite nature very unstable easy caking, moisture, decomposition, in severe cases can be spontaneous, cumbersome management, the decomposition rate is difficult to control, reducing but not lasting, often resulting in uneven stripping, repair color reach agreement results. Hydrogen peroxide is very unstable when exposed to heat, light, impurities, shock, heavy metals are easy to cause decomposition = ± 0.5 when the most stable in the pH, if the pH value rises, the decomposition rate increases; corrosive and high concentrations hydrogen peroxide so that combustion of organic matter; selective dye, the dye stripping Blending shade may vary, it is absolutely necessary before stripping sample. Acrylic fabric cationic dye stripping commonly used sodium hypochlorite stripping process will emit toxic chlorine gas and sodium hypochlorite. Therefore to find a stripping better, comparable with similar foreign new products, not stripping agent of the above-mentioned problems is very meaningful. We developed two new vat dyes stripping system NDA, NDA-1, both stripping system by stripping accelerator N-2, respectively, with the the color stripper N-1, N-10 use color stripper alkaline solution, stripping accelerators N-2 as a powdery substance, the stripping agent N-1, N-10 were strongly reducing inorganic salt with sodium hydroxide prepared from an aqueous solution. NDA and NDA-use technology has a greater impact, the effect of stripping, stripping process is not the same for different fabric dye. Analysis: the main factors of the stripping agent N-1, N-10 the amount of accelerator N-2 and the ratio of the stripping agent stripping, stripping time, stripping the pH value, stripping temperature. Usually stripping effect with the accelerator N-2 and the ratio of the stripping agent stripping, stripping time, stripping the pH value, stripping the increase of temperature, eventually stripping effect to stabilize. This article also discusses the use of new stripping systems NDA NDA-1 reduction cleaning the feasibility of disperse dyes on polyester knitted, the traditional process uses hydrosulfite cleaning. Comparative analysis of the opinion: In addition to the use of the N-1 or N-10, the relative weight of the fabric of the stripping agent for 0.3% to 0.5%, the remaining conditions with disperse dyes on polyester fabric stripping process the same case, reduction cleaning polyester fabric, the fabric before and after the K / S value of the difference in the acceptable range, and soaping fastness, sublimation fastness and perspiration better than hydrosulfite cleaning process.
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