l. The more water-soluble reactive dyes contained in the water-soluble reactive dye of the dye, the more favorable the dye is dissolved and dyed during the dyeing process, and of course, the washing of the floating color. However, after the dyeing is completed, the "excellent water-soluble group" becomes an unfavorable factor for the wet rubbing fastness. This is because the presence of water-soluble groups enhances the tendency of the dye molecules to desorb from the cellulose and dissolve in the water. The better the water solubility, the easier the dye is to break from the fibers. In order to solve this contradiction, after the dyeing is completed, the water-soluble group can be blocked by the fixing agent to improve the wet rubbing fastness of the dyed fabric.
2. The directness of the direct reactive dye of the dye is mainly related to the molecular weight of the dye, the polarity, the regularity of the structural morphology, the active group and its position. The larger the molecular weight, the stronger the polarity, and the better the regularity of the structural morphology, the higher the directness of the dye molecules and the worse the diffusion performance. The dyes tend to accumulate on the surface of the fabric and are not easily diffused and transferred into the fibers. Causes too much floating color. The directness is too low, which affects the fixing rate. Therefore, the directness of the reactive dye is preferably medium. The size of the directness can be measured from the Rf value and the bleed test.
3. The reactive group reactive groups are different, and the covalent bond stability formed by the reaction with the fibers is also different. In general, the higher the reactivity of the active group, the worse the stability after bonding. The active groups are different, and the covalent bond formed by the reaction with the fiber has different acid-base stability. The ester bond formed by the reaction of X-type s-triazine reactive dyes with fibers has poor acid resistance stability. When exposed to acid gases and moisture, dyes and fibers are broken. KN-type vinyl sulfone dyes react with fibers to ether. Bond bonding, acid hydrolysis is relatively stable, but in alkaline media, it is easy to cause covalent bond cleavage between dye and fiber. M and ME reactive dyes containing double reactive groups are more resistant to acid and alkali, but the pH of the fabric is preferably kept neutral. Therefore, it is also important to control the pH of the fabric of the finished color cloth to the wet rubbing fastness of the fabric.
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