Oxidized polyethylene wax is a polymer compound. Its production method is to polymerize ethylene into polyethylene and then oxidize the polyethylene to obtain oxidized polyethylene wax. It has good wear resistance, heat resistance, chemical resistance and electrical insulation. It is widely used in various fields such as manufacturing, chemical industry, construction, printing, coating and so on.
There are many kinds of oxidized polyethylene wax, the common ones are: 1. High-density oxidized polyethylene wax; 2. Low-density oxidized polyethylene wax; 3. Microcrystalline oxidized polyethylene wax; 4. Linear oxidized polyethylene wax; 5. Non-ionic oxidized polyethylene wax, etc.
When selecting oxidized polyethylene wax, the following aspects should be considered: 1. Product purity; 2. Product particle size; 3. Product dissolution point; 4. Product content; 5. Product application fields.
The difference between high-density oxidized polyethylene wax and low-density oxidized polyethylene wax lies in their different densities. High-density oxidized polyethylene wax has a larger density, generally between 0.93-0.96g/cm³. Second, low-density oxidized polyethylene wax has a smaller density, generally between 0.88-0.92g/cm³.
The production process of high-density oxidized polyethylene wax generally includes the following processes: 1. Raw material processing; 2. Heating and mixing; 3. Oxidation reaction; 4. Refrigeration and separation; 5. Refining and packaging.
Low-density polyethylene production process
The low-density polyethylene production process mainly includes ethylene secondary compression, initiator and conditioner injection, polymerization reaction system, and high and low pressure separation and recovery system. , extrusion granulation and post-processing system.
Depending on the type of reactor, it can be divided into two types: high-pressure tube type and autoclave type.
Tubular and kettle-type processes each have their own characteristics: the tubular reactor has a compact structure, is convenient for production and maintenance, and can withstand higher pressure; the kettle-type reactor has a complex structure, is relatively difficult to maintain and install, and has a large volume of reactor. It is generally very small because of the limited thermal decomposition capacity of the reaction.
Generally speaking, most large-scale equipment adopts the tubular method, while high value-added products such as special models with high vinyl acetate content and EVA production equipment use the kettle method.
Due to different processes, kettle-type products have many branches and good impact strength, and are suitable for extruding coating resins. Tubular products have a wide molecular weight distribution, few branch chains, and strong optical properties, making them suitable for making films.
Production process of low-density polyethylene by pressure tube method
The inner diameter of the tubular reactor is generally 25~82mm, the length is 0.5~1.5mmkm, and the aspect ratio is greater than 10000: diameter to inner diameter ratio Generally not less than 2mm, there is also a water jacket to remove part of the reaction heat.
So far, the basic processes of various tubular processes are roughly the same. Due to the use of different reactor feed points, different content of conditioners, initiators and injection locations, as well as different additive injection methods, commodity handling, ethylene return amounts and delivery locations, processes with various characteristics will be formed.
At present, the more mature tubular production processes mainly include LyondellBasell’s LupotechT process, ExxonMobil’s tubular process, DSM’s CTR process, etc.
Substitutes for oxidized polyethylene wax include: 1. Polyethylene wax; 2. Polypropylene wax; 3. Polyethylene lipids; 4. Polyesters; 5. Polyurethane, etc.
