The coloring of rubber products can be inorganic pigments or organic ones. They all have good heat resistance, light fastness and weather fastness. They can promote vulcanization and increase mechanical strength. At the same time, depending on the type of products, there will be different The method is provided for use.

Rubber product coloring method:
1. Coloring by solution method. The manufacturer of the water tank gasket is to dissolve the rubber into a certain concentration solution with a good solvent, and then add the coloring agent and the rubber compounding agent other than sulfur to the solution, stir and mix uniformly, and remove the solvent at a certain temperature to remove the solvent. Finally, add sulfur to the rubber mixer. The coloring method is complicated in operation, the coloring agent and the compounding agent are unevenly dispersed, the color difference is poor, the solvent is difficult to be recycled, and the environment is polluted, which has been less used at present.

2, mixing method coloring. This method is a commonly used method for coloring rubber products. The coloring agent is directly added or mixed with a carrier and then added to a rubber compound, and uniformly mixed by a rubber mixing machine to color the rubber.

3, water tank gasket manufacturers introduce dry powder coloring This method is to directly add powdered coloring agent along with the small material to the rubber, mixing on the open mill. The method has the advantages of simple operation and low cost, but the dust is large during the mixing, pollutes the environment, and is not easy to disperse uniformly, and has a color difference. If the particles are too hard and too thick, the quality problems such as color point, stripe or chromatogram may be caused to be contaminated. It has been used less frequently. For ease of use, powdered colorants can be prepared as pre-dispersed colorants together with stearic acid, sulfates, and the like, and are commercially available.