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Polyethylene wax and oxidized polyethylene wax are often used in the production of plastic industry. From the same point of view, both can be used as lubricants, but there are also differences between them. Today, through this article, let's take a look at the differences between polyethylene wax and oxidized polyethylene wax.
Polyethylene wax is also called polymer wax. It is widely used because of its excellent cold resistance, heat resistance, chemical resistance and wear resistance. In normal production, this part of wax can be directly added to polyolefin processing as an additive, which can increase the gloss and processability of products. As a lubricant, it has stable chemical properties and good electrical properties.
The molecular chain of oxidized polyethylene wax has a certain amount of carbonyl and hydroxyl groups. Oxidized polyethylene wax is an excellent new polar wax, so its compatibility with fillers, pigments and polar resins is significantly improved. Its lubricity and dispersion are better than polyethylene wax, and it also has coupling property.
Oxidized polyethylene wax is low molecular weight polyethylene, characterized by high softening point (above 100 ℃), close to high molecular weight polyethylene. However, the melt viscosity and hardness are close to paraffin. Polyethylene wax has good compatibility with polyethylene, polypropylene, polyethylene wax, ethylene propylene rubber and butyl rubber, and can improve the fluidity of polyethylene, polypropylene and ABS and the release property of polymethylmethacrylate and polycarbonate.
Compared with other external lubricants, oxidized polyethylene wax has stronger internal lubrication effect on PVC; In addition, it can also be used for ink, paper, concentrated masterbatch, biodegradable masterbatch, film and candle, paint, hot melt adhesive and adhesive.
PVC has good characteristics, but also has disadvantages, one of which is poor thermal stability. Oxidized polyethylene wax is used to inhibit or prevent the thermal degradation of PVC during processing and prolong its service life. The oxidized polyethylene wax shall not affect the color and transparency of the product, and have good compatibility with resin and plasticizer, low price and low consumption. Lubricants play a very important role in polymer processing. In the production of PVC heat shrinkable film, an appropriate amount of lubricant should be added to reduce harmful friction and interfacial adhesion. According to the action mechanism of the lubricant. Properly adjust the matching amount of internal and external lubricants to reduce the matching cost.
Stearic acid and oxidized polyethylene wax have polar groups of carboxyl group and hydroxyl group on the molecular chain, which can obviously improve the compatibility of PVC and have unique internal and external lubrication. Plasticizer is one of the important additives in the processing of PVC heat shrinkable materials. It can reduce the force between polymer molecules, increase the plasticity of polymer and improve the formability of PVC. In the production of PVC heat shrinkable film, adding an appropriate amount of oxidized polyethylene wax in the formula can improve the processing performance, make PVC particles easier to break and melt, improve the gel speed and melting quality of the material, and have high melt strength.
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