Reactive dyes are dyed on fibers through four processes: adsorption, diffusion, fixation and washing;
①The dye is adsorbed from the dye solution to the fiber surface;
②The dye is absorbed from the fiber surface The surface diffuses and penetrates into the interior of the fiber;
③The dye molecules react chemically with the fiber under the action of alkali,
④Hydrolyzed dyes are soluble in water and have low affinity for fibers, so soaping removes noise.
The dyeing method varies with the properties of the reactive dye. When dyeing dichlorotribenzene type reactive dye, it is mainly dip-dyed at room temperature. The dyeing process is: dissolve the dye in water, add salt in portions within 30 minutes at room temperature to make the dye bath concentration reach 15~30g/L, and then add soda ash 5~1Qg/L. At this time, the dye adsorbed on the fiber is bonded to the fiber, destroying the original adsorption balance. As a result, the fiber absorbs the dye, and the adsorbed dye bonds with the fiber. The dye that finally interacts with the fiber accounts for 60% to 70% of all dyes in the dye bath. At the same time as the reaction occurs, the reactive dye also begins to hydrolyze. Therefore, reactive dyes are required to have a higher diffusion rate and reduce their hydrolysis.
The temperature required for dyeing with monochlorotrifluorobenzene reactive dyes is higher, and they interact with fibers more slowly. During medium dyeing, it has the disadvantages of low coloring rate and high dye loss. Generally, pad dyeing and steaming methods can be used for dyeing. Using sodium carbonate or sodium phosphate as an alkali agent, the dyeing method of vinyl inkstone reactive dyes is basically the same as that of triazole reactive dyes.
