Reactive dye dyeing technology improvement

Abstract

The invention discloses a reactive dye dyeing technology improvement. The adopted salt and alkali technology is good in levelling property, high in color yield, and short in dyeing time, after being added into a dyeing machine at normal temperature, salt and one third pure alkali are evenly adsorbed by a dyed article under the condition of no dyes, so as to eliminate negative charges on fibers and ionize partial hydroxyls in the fibers, then dyes are slowly added to generate adsorption, diffusion, dye uptake and bonding color fixation; due to the low temperature and pH value, the initial dyeing rate and the color fixation speed are low, the color fixation is performed while dye uptake so as to achieve the levelling effect, the dye uptake percentage and the color fixation increased can be improved by heating, and after the dye uptake and the color fixation are greatly improved, the alkali is secondarily added for color fixation, the pH value of dye bath can be increased, the color fixation percentage is increased, the step-by-step heating and the twice alkali addition are adopted during the whole dyeing process, so that the hydrolysis of the dyes can be reduced, the color yield can be increased, the salt is relatively conveniently added relative to thick and deep color products with the relatively high amount of the salt and the alkali, and the technology control is facilitated.

Description

[0001] technical field [0002] The invention belongs to a dyeing process, and in particular relates to an improvement of a reactive dye dyeing process. [0003] Background technique [0004] Reactive dyes, also known as reactive dyes. It is a class of dyes that chemically react with fibers during dyeing. Such dye molecules contain groups that can chemically react with fibers. When dyeing, the dyes react with the fibers and form covalent bonds between them to form a whole, which improves the fastness to washing and rubbing. However, in order to achieve an accurate dyeing in the traditional reactive dyeing process, the dyeing process conditions must be designed on the basis of multiple experiments, such as dyeing temperature, dyeing accelerator, leveling agent dosage, color fixing agent dosage and color fixing PH value, bath Ratio, cloth speed, pump flow, dyeing time and so on. The operation is complex and prone to uneven dyeing. [0005] Contents of the invention [...

AI Technical Summary

Problems solved by technology

Complex operation, prone to uneven dyeing