Introduction to the methods of coloring rubber granules

There are two main methods for the preparation of colorant granules. The first method is the same as other powdery compatibilizer granulation methods, the first will be powdered colorant with surfactant infiltration, and then by wax melting or with the resin melting extrusion granulation; the second method is the colorant with surfactant infiltration and then by the role of mechanical force to make the colorant particles fine, made of a certain concentration of the dispersion, and then with the latex mixing and co-sinking, after drying and rolling granulation. The surfactants are mostly anionic and non-ionic, such as fatty acid salts, sulfonates, etc. The latex is usually natural latex. This kind of granular colorant is easy to use, good dispersion, no dust flying, no pollution of the environment, bright color, uniform color, no color difference, is a promising coloring method. However, the complexity and high cost of the preparation process of granular colorants limit its wide application.
Mother refining rubber coloring this method is the first coloring agent, part of the plasticizer and rubber other agents and raw rubber through the mixing machine to make the concentration of about 50% of the coloring agent mother refining rubber, and then in proportion to the coloring agent mother refining rubber. Rubber, and then mixed proportionally into the rubber coloring. This method is more effective in coloring colorants with fine particles and difficult to disperse, with even coloring and no color difference. Pay attention to the concentration of the colorant in the masterbatch and the proportion of the colorant in the rubber when mixing. The concentration of colorant in the rubber and the amount of other matching agents in the masterbatch are deducted.