Under normal circumstances, the masterbatch carrier resin and the matrix resin of the product should be selected from the same type of polymer, in order to ensure that the carrier resin and the matrix resin have chemical compatibility. Such as: copolymerized POM resin can be used as a carrier resin for homopolymerized POM resin, SAN resin can be used as ABS matrix carrier resin (but not GPPS, HIPS), PA6 as a carrier resin can be used for PA66, PA46 matrix coloring. The reason is that PA6 has a lower melting point and is naturally compatible with nylon, which can ensure good mixing and dispersion. In addition, for a certain plastic alloy, one of the two polymers in the alloy can be used as a carrier resin for the masterbatch.
The amount of color masterbatch added to the resin is generally 2 to 5%. In the matrix resin, the content of the carrier resin accounts for at least about 1 to 3%. This makes it one of the largest additives in the additive family, so it is important to pay attention to the details when determining the carrier resin. In the process of masterbatch production, if incompatible resin is used as a carrier, impurities or pollutants are intentionally introduced. Imagine that if the injection molding plant finds PE pellets in the bucket of ABS, PS, or PBT, they will definitely discard it or pick out these PE miscellaneous materials. However, many people care about how to meet the manufacturer's specified colors at the lowest cost. The methods include adding more fillers, using cheap pigments and even recycled materials. The most common is the use of inexpensive polymers such as PE or ethylene copolymers such as LLDPE, POE, EVA.