Attention to the use of reactive dyes

When using reactive dyes, note the following points:

1. The selection of the basic three primary colors is important, and their solubility, directness, diffusivity, compatibility, susceptibility to normal fluctuations in dyeing conditions, fixation action, and washability should be fully taken into consideration to ensure dyes. The balance between directness and diffusivity can be quickly achieved. The directness, diffusivity, fixation behavior and washability of the dye are reasonably balanced. The fabric can penetrate and level dye well, while the dyestuff is not fixed. Water dyes can be easily washed off.

2. Light color is particularly light when dyeing in shallow and medium colors. Due to poor light fastness of azo red dyes and azo blue dyes, it cannot meet market requirements and requires careful selection. As for the use of the sun-light fastness enhancer, it is necessary to pass an experiment. In general, an ultraviolet absorber is used to improve the light fastness of a reactive dye.

3. The wet rubbing fastness of many varieties when dyeing deep dark shades is poor, which can not meet the market requirements and requires careful use. The key to improving the wet rubbing fastness of reactive dyeings is the basic dyeability of the cotton material, namely the surface structure, surface texture, smoothness, and coarseness of the cotton fiber, the quality of the cotton fiber and the quality of the cotton yarn, and the pretreatment of the cotton fiber, etc. Directly related, however, the structural characteristics of the reactive dyes also have a certain influence, and if selected properly, the wet rubbing fastness can be increased by a level of 0.5 to about 1st grade. The ideal reactive dye should be an excellently enhanced, high dye and fiber. Reactivity, bond stability, excellent washability and other properties.

4. For the requirements on the fastness of textile composites proposed in the market, such as the light fastness of sunlight, the fastness of alkaline wet bleaching, the fastness of alkaline wet bleaching with peroxide, the reactive dyes still exist. Certain problems need to be selected through experiments. In fact, these problems are also one of the focuses of the research and development of dyes containing heterogeneous double reactive dyes.

5, the quality requirements of reactive dyes need to be different depending on the application methods and objects, such as reactive dyes for padding, fastness, light fastness, wet fastness, bond stability, resin packing fastness, can be drawn Fastness, etc., Dyeing properties require solubility under dyeing conditions, bath stability (30 minutes, 40 minutes, 60 minutes), washability, compatibility (1 and 5 padding times, shallow, medium , deep three-color test), covering, fixing speed and so on. For reactive dyes for dyeing, the fastness requirements are the same as above, and the dyeing properties also require the dyeing conditions (pH, bath ratio, salt content, etc.) to affect the fixation of the dyes.

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