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Dispersant is an additive that promotes the uniform dispersion of various auxiliary materials in resins, and is commonly used in color masterbatches, colored products, and high filling products. PE wax is widely used as a dispersant in the processing of polyolefin masterbatches as a dispersant. It has good compatibility with resins such as polyethylene, polyvinyl chloride, and polypropylene, and has excellent external and internal lubrication effects.
In today's article, Sainuo will take you to see what conditions polyethylene wax should meet as a dispersant.
(1) Appropriate molecular weight - viscosity of polyethylene wax
The wetting rate of pigments is related to the viscosity of the wetting agent, as the lower the viscosity of the wetting agent used for pigments, the better its fluidity and wetting efficiency. The easier it is to perform capillary penetration in the microwave gap between pigment particles during the wetting process, the easier it is for the pigment to be wetted. If the molecular weight of polyethylene wax is too large, the melt viscosity of polyethylene wax is too high, which is not conducive to the effective wetting and penetration of pigment aggregates by polyethylene wax. On the contrary, if the molecular weight of polyethylene wax is too low, the melt viscosity of polyethylene wax is too small, which is not conducive to the effective transmission of shear force, and the pigment aggregates are not easily opened. Within a certain range, an increase in the amount of polyethylene wax results in an increase in the dispersibility of pigments. However, if the amount of polyethylene wax is too high, it is not conducive to the dispersion of difficult to disperse pigments, as an excessive amount of polyethylene wax can significantly reduce the melt viscosity of the masterbatch system, thereby weakening the effect of shear force.
(2) Molecular weight distribution
This is a very important consideration factor, which is often overlooked. Be sure to choose polyethylene wax with a relatively concentrated molecular weight distribution. If the molecular weight distribution of the PE wax product used is wide, it must contain a large number of parts with excessive and insufficient molecular weight. However, if the viscosity of the wax with excessive molecular weight is too high, it will inevitably affect the wetting effect; If the molecular weight is too small, the viscosity is too low, leading to a decrease in the viscosity shear ability of the system and affecting dispersion.
(3) Good heat resistance
The use of polyethylene wax in the processing of color masterbatches varies in terms of its physical properties. In the final product forming and processing stage, the temperature experienced during this process is generally around 170-200 ℃. If the thermal stability of the wax is poor, it will inevitably decompose during the processing and preparation process, which will have a serious impact on the final form and performance of the product. Therefore, polyethylene wax must have good thermal stability.
(4) Powder fineness
Fine polyethylene wax powder can quickly complete the melting process in the equipment, which means that pigment particles can be soaked earlier and enter the wetting and dispersion process, which effectively improves the wetting speed; So micro powder wax is more favored by the industry.
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