Views: 1000 Author: Site Editor Publish Time: 2021-04-29 Origin: Site
The following 3 points must be paid attention to when using high temperature levelling agent:
(1) The dosage should be 1~1.5g/L, and it must not be too high, otherwise, the thermal cohesion of the dye will increase, the dye uptake rate will be reduced, and the color will be abnormal.
(2) It is best to dilute it before use and mix thoroughly in warm water below 60°C before adding the dye to prevent part of the non-ionic components from dissociating from the colloidal particles of the anionic component and forming tar compounds with the dye molecules.
(3) Properly master chemical operation. The cohesion and association of disperse dyes are directly related to factors such as temperature, concentration, time, and additives. Therefore, the following points should be paid attention to when chemical materials:
1. Commonly used diffusing agents and solid additives have greater viscosity at high concentrations. If mixed with dyes, it will increase the cohesiveness of the dyes and cause difficulty in toning, and even leave color groups and color blocks, so Dyestuffs and auxiliaries should be separated into materials.
2. Use warm hydrated materials below 50℃, and must not overheat. For example, Disperse Scarlet has good dispersing performance below 50°C, but severe association precipitation will occur above 80°C.
3. The amount of water used for chemical materials should be as much as possible. If the bath ratio is too small, the dispersion effect of the dye will often be reduced. Practice shows that 1:10~15 is appropriate.
4. The dispersant or levelling agent should be fully dissolved in warm water, and no granular or paste should be present.
5. The chemical material should not be too early, and it is best to use it with the chemical, otherwise, it will increase the tendency of the dye to associate.
6. Regardless of dyes and auxiliaries, they must be filtered with a screen before use.