What is the effect of adding PE wax to PVC material? Polyethylene wax is a kind of lubricant and release agent with good external smooth effect. The effect mechanism of the lubricant is to reduce the friction between the polymer and the contact surface of the processing machine and between the polymerized molecular chains. The former is called the outer lubricant, and the latter is called the inner lubricant.
The internal lubricant has a certain compatibility with the polymer. At normal temperature, the compatibility is small, but at high temperature, the compatibility increases accordingly.
Performance of smooth effect in products:
1. Lubricant. Internal smoothing effect For PVC, the lubricant and plasticizer can be regarded as the same substance, but the polarity of the lubricant is lower, and the compatibility of the lubricant with PVC is lower than that of the plasticizer.
2. Lubricant. During processing, it is easy to extrude from the mixed material under pressure, and migrate to the surface or outside the interface between the mixed material and the processing machine. The molecular orientation of the lubricant is arranged, and the polar group faces the metal. It belongs to the surface and forms a lubricant molecular layer through physical adsorption or chemical bonds. Because the cohesive energy between the lubricant molecules is low, it can reduce the friction between the polymer and the surface of the equipment and prevent it from adhering to the machine. outwardly.
3 The viscosity of the lubricating interface film and its lubricating power depend on the melting point and processing temperature of the lubricating agent. Generally speaking, lubricants with longer molecular chains have greater smoothing effect.
Polymer wax is a good internal lubricant, which is used for polyethylene and polypropylene. It is not completely compatible with polyethylene wax, so it has an external lubricant effect to a certain extent. For large injection molded products, wax can not only improve the fluidity during processing, but also greatly improve the surface gloss and environmental stress cracking resistance.
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