Rubber colorant (also called masterbatch): It is made from natural or synthetic rubber by adding the right amount of color powder and some additives to form the required color, and then made into flake pigment through several processing procedures, which can be used as the coloring or toning of shoe soles, bicycle tires, balls, toys, rubber sheaths of cables...and so on.
Comparing with color powder, masterbatch has the following advantages:
(1) The colors are complete and bright, and can be adjusted to the required colors according to the customer's needs.
(2) It is convenient to take and weigh the material, good dispersibility, compatible with natural rubber and many kinds of synthetic rubber, easy to control the color stability, reduce the color difference to make the product increase the added value, no dispersion during the operation to reduce the loss, do not contaminate the plant, and it is not easy to produce the color difference.
(3) Resistant to vulcanization and color shift, small color difference before and after vulcanization, and no mutual pollution among various colors after finished products.
(4) The color concentration of this product is high, so the dosage is low, which can save the cost and meet the economic benefits.

Silicone masterbatch is made of silica gel as the carrier, pigment content ranges from 5~30%. Silicone masterbatch can avoid the defects such as difficult weighing, color deviation and poor dispersion, which are caused by the direct use of color powder;

Rubber color mixing skills
Rubber color mixing requires a little experience and basic common sense of color composition, the color is basically composed of the three primary colors, buy this color card has a special standard number, but also the composition of the color and ratio, but this can only be in the general direction of reference, because the masterbatch is not the same as the substrate is not the same, plus the rubber also has to be vulcanized, there are changes after high temperature. If sulfur is added, there will be yellowish. Some accelerators and antioxidants will also affect, which requires professional knowledge and extensive experience.

Color sense is also very important, some people adjust the color very quickly, his sense is very keen, of course, more adjustments, practice makes perfect. Sometimes find a sample of the color of the product and the sample is close to the general direction, the composition of the rubber is also the same, it is easy to fine-tune three or five times can be engaged in point. Sometimes there is no feeling when also really annoying.