Homopolyethylene wax is mainly used in polyolefin Color Masterbatch, including polyethylene Color Masterbatch, polypropylene color masterbatch and EVA color masterbatch. Due to the large amount of pigment or filler in the color masterbatch, and the particle size of these pigments and fillers is very small, ranging from 0.01 to 1.0 μ M level, easy to reunite. By adding homopoly polyethylene wax, the polyethylene wax melts within a certain temperature range to wet the surface of pigment or filler, reduce the agglomeration between pigment or filler particles, and increase the compatibility between pigment or filler and matrix resin. With the help of the shear force of twin-screw extruder or internal mixer, Thus, the pigment and filler are evenly dispersed in the resin melt.  pe wax for color masterbatch

There are also some differences in the application of homopolyethylene wax from different production routes in color masterbatch. Polyethylene wax from by-products generally has low viscosity. Although it has good wettability to pigments and fillers, it is likely to precipitate in terminal application due to its small relative molecular weight, complex components and poor batch stability.. The polyethylene wax produced by cracking method may produce black spots due to the limitation of the process route. It has high requirements for the quality control of the back end. At the same time, the relative molecular weight distribution is wide. It contains high relative molecular weight parts that are ineffective for wetting and low relative molecular weight parts that are easy to produce taste. It also has the risk of precipitation in terminal application. Polyethylene wax produced by polymerization has narrow relative molecular weight distribution, so it has higher efficiency of dispersing pigments and fillers and lower risk of precipitation.

Compared with the three polymerization processes of free radical polymerization, Ziegler Natta and metallocene, the polyethylene wax of free radical polymerization contains long branched chains and double bonds, so it generally has low crystallinity, soft and good wettability to pigment fillers, but it will have a certain aromatic smell due to the presence of chain terminator. Ziegler Natta polymerization is low-pressure polymerization, with higher purity and higher temperature resistance, However, due to the need to remove catalyst and solvent in the process, the operation cost is high. Polyethylene wax synthesized by metallocene polymerization technology is a more advanced polymerization technology. The catalyst has high reaction activity and less residue in the final product, so more diversified products can be designed. The temperature resistance test of polyethylene wax with three polymerization methods in 200 ℃ air shows that the degree of color yellowing from light to deep is metallocene polymerization, Ziegler Natta polymerization and free radical polymerization.

In general, customers can choose different types of polyethylene wax according to the end application. If the color masterbatch is used in low-end applications, such as garbage bags, garbage cans, mulching films, etc., customers can choose by-product wax or pyrolysis wax. If the color masterbatch is used in mid-range applications and has dispersion and taste requirements, synthetic polyethylene wax should be selected. If the color masterbatch is used for special applications with harsh taste and temperature resistance, Ziegler Natta or metallocene polymerized polyethylene wax should be selected. At this time, users should not only choose polyethylene wax as a dispersant, but also consider other requirements from end applications.
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