Polyethylene wax, also known as polymer wax, is widely used due to its excellent cold resistance, heat resistance, chemical resistance, and wear resistance. In normal production, this wax can be directly added to polyolefin processing as an additive, which can increase the luster and processing performance of the product. As a lubricant, it has stable chemical properties and good electrical properties. Compared to PVC and other external lubricants, polyethylene wax has a stronger internal lubrication effect.

Fischer Tropsch wax is mainly composed of linear, saturated high carbon alkanes with a relative molecular weight between 500 and 1000, which endows this chemical with a fine crystal structure, high melting point, narrow melting range, low oil content, low penetration, low mobility, low melting viscosity, hardness, wear resistance, and high stability.

The significant difference between Fischer Tropsch wax synthetic wax and general polyethylene wax is that:
(1) Molecular weight. The molecular weight of Fischer Tropsch wax is much lower than that of PE wax, with fewer branched chains and high crystallinity. It is easy to penetrate into high viscosity macromolecular chains, significantly reducing melt viscosity. It has low migration during processing and obvious lubrication effect in the later stage.
(2) Fischer Tropsch wax is a saturated direct linked alkane that does not contain double bonds, has strong antioxidant capacity, and the product has good weather resistance.

(3) The viscosity of Fischer Tropsch wax is much lower than that of PE wax. Only around 10. A smaller amount can achieve the same lubrication effect. The usage is only 70-80% of PE wax. Fischer Tropsch wax has good compatibility with PVC and can be used as both internal and external lubricants. It can be used as a good internal lubricant to effectively control shear conditions, promote flow, control friction and melting properties, thereby improving thermal stability. At the same time, due to its high crystallinity and high linear structure, Fischer Tropsch wax enables PVC products to achieve the best physical and processing properties. According to needs, the Fischer Tropsch process can synthesize alkanes with different chain lengths to change the molecular weight of the final product and form a series of products.

The main mechanism of action of external lubricants
Usually, the external lubricant of PVC is a high melting point wax with non polarity or low polarity, relatively high melting point of 50-200 ℃, and relatively large molecular weight.
The mechanism of action is to utilize its incompatibility to form a lubricating layer outside the surface of the PVC melt or flow unit, improving the friction between the surfaces of the flow units and between the melt and the metal surface. It is easy to precipitate at high temperatures, but not easy to precipitate at room temperature.

The effect of lubricants on products
External lubricant, plasticizing from fast to slow, product performance from high to low, and flowability from poor to good to disordered.
At the initial stage of extrusion processing, when resin particles are sliding friction with each other, the melting point of external lubrication is high and there is no melting, which will not delay the plasticization. In the middle and later stages of processing, the temperature of the melt increases, and the melted external lubricant covers between the melts, appropriately delaying plasticization and improving adhesion with the metal, preventing excessive plasticization of the melt and providing good demolding performance.
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