Polyethylene wax (PE) is a type of synthetic wax that is prepared by ethylene polymerization and is non-toxic, hard and white. PE wax is available in the form of flaky pellets and powder. Major end-use industries for PE wax include coatings, textiles, printing inks, polish, food packaging and processing, paint, oil and gas, cosmetics, pharmaceuticals, paper, and leather.
Oxidized polyethylene waxes have many applications such as plastic, rubber, leather, paper, ink and textiles, etc. Conditions such as KMnO4 catalyst, reaction temperature 141-148 degrees Celsius, reaction time 3-7 hours, air speed 4-8 meters per second are needed to prepare oxidized polyethylene waxes. By using this method, it is possible to obtain oxidized polyethylene waxes with an acid number above 30 mg kg/h.
Polyethylene wax is prepared through LDPE and orthogonal tests and it was found that temperature, time and solvent to feed ratio can affect this test.

Polyethylene wax

It is obtained from the decomposition of PE garbage bag under optimal conditions and the best conditions in orthogonal tests. The average molecular weight of polyethylene wax is from 1970 g/mol to 2700 g/mol.
Polyethylene was first developed by the German chemist Hans von Pachman, who accidentally prepared it in 1899 while researching diazomethane. When his colleagues Eugen Baumberger and Friedrich Tcherner characterized the white, waxy substance he had created, they recognized that it contained long chains of -CH2- and called it polymethylene.
A pill box presented to a technician at ICI in 1936 was made from the first pound of polyethylene.
The first synthesis of polyethylene was discovered in 1933 by Eric Fawcett and Reginald Gibson, again by accident, at Imperial Chemical Industries (ICI) in Northwich, England. After applying very high pressure (several hundred atmospheres) a mixture of ethylene and benzaldehyde again produced a waxy white substance. Because the reaction was initiated by oxygen contamination in their apparatus, the experiment was initially difficult to reproduce. It was not until 1935 Another ICI chemist, Michael Perrin, achieved this coincidence in 1939 in the form of a renewable high-pressure synthesis for polyethylene, which was the basis for the production of low-density polyethylene (LDPE). A successful turning point in the commercial production of polyethylene began with the development of a catalyst that promoted polymerization at mild temperatures and pressures. The first was a chromium trioxide-based catalyst discovered in 1951 by Robert Banks and J. Paul Hogan at Phillips Petroleum. In 1953, the German chemist Carl Ziegler developed a catalytic system based on titanium halides and organoaluminum compounds that worked even under milder conditions than the Phillips catalyst. The Phillips catalyst is cheaper and easier to work with, however, both methods They are heavily used industrially. In the late 1950s, both Phillips and Ziegler catalysts were used to produce high-density polyethylene (HDPE). In the 1970s, the Ziegler system was improved by incorporating magnesium chloride. Catalytic systems based on soluble catalysts, metallocenes, were reported in 1976 by Walter Kaminski and Hansjorg Sein. The Ziegler and metallocene-based catalyst families have proven to be very flexible in copolymerizing ethylene with other olefins and serve as the basis for a wide variety of polyethylene resins available.

Mechanical properties of polyethylene

Polyethylene has little hardness and strength, but it has good flexibility and resistance, and it also has less friction. This mode exhibits strong creep under continuous stress, which can be reduced by adding short-span fibers. We feel wax when touched.

Thermal properties

Commercial use of polyethylene is limited by its relatively low melting point. For commercial use of medium and high density polyethylene, the melting point is usually in the range of 120 to 180 °C (248 to 356 °F). This temperature varies greatly according to the type of polyethylene.

Chemical properties

Polyethylene is composed of high molecular weight, non-polar, saturated hydrocarbons. Therefore, its chemical behavior is similar to paraffin. Individual macromolecules are not covalently linked. Due to their symmetrical molecular structure, they tend to crystallize. In general, polyethylene is partially crystalline. Higher crystallinity increases density and mechanical and chemical stability.

Polyethylene is composed of high molecular weight, non-polar, saturated hydrocarbons. Therefore, its chemical behavior is similar to paraffin. Individual macromolecules are not covalently linked. Due to their symmetrical molecular structure, they tend to crystallize. In general, polyethylene is partially crystalline. Higher crystallinity increases density and mechanical and chemical stability.
Polyethylene absorbs almost no water. The permeability of water vapor and water (only polar gases) is lower than that of most plastics.

PE wax becomes brittle when exposed to sunlight, carbon black is usually used as a UV stabilizer.
Polyethylene burns slowly with a blue flame with a yellow tip and smells like paraffin (candle flame).
Polyethylene cannot be used without seasoning before sticking to adhesives.

Electrical properties of polyethylene

Polyethylene is a good electrical insulator. It has good resistance to electrical fluctuations. However, it is easily charged by electrical pressure (which can be reduced by adding graphite, carbon black, or antistatic materials).

Optical properties

Depending on the temperature and thickness of the PE film, it may be clear (transparent), milky opaque (transparent) or opaque. Thus, LDPE has the largest, LLDPE slightly less and HDPE has the least transparency. If they are larger than the wavelength of visible light, the transparency will be reduced by the crystals.

The use of quality packaging in the food industry increases the demand for polyethylene wax. Industry actors are trying to use advanced technologies for their production processes. Honeywell originally pioneered PE wax production technology and additive development, which is now used by many other plastic and chemical manufacturers worldwide.

This product has been widely used in manufacturing industries due to its high performance properties such as low melting viscosity and compatibility with plasticizers, lubricants and stabilizers. LDPE and HDPE are obtained through high-density polymerization and are commonly used as PVC processing lubricants, hot melt adhesive modifiers, and water-based emulsion additives to improve slip, friction, and scratch resistance.
PE wax has gained significant acceptance in the coating industry and is increasingly used in water-based wax emulsions, non-ionic emulsions, and PVC processing in various manufacturing sectors.

Based on application, polyethylene wax is divided into printing inks, adhesives, masterbatch, plastic, rubber, and others. Another part includes cosmetics, leather, paper, candles and textiles.

PE waxes have lubricating properties that support resin processing. In addition, these waxes are widely used to disperse dyes in plastics and other additives. The increasing demand for PE plastics by the food and other packaging industries has created a growing trend. In addition, Westernization in emerging economies has a positive impact on demand for quality products and is expected to increase printing ink sales in Asia Pacific.

It is expected that the Middle East and Africa will see a significant profit in their income share due to the dominant infrastructure of oil and gas and the low price of products.

It is expected that with the adoption of nano technology in the coating industry, metal and micro-ceramic particles will be used as a main factor in the market due to the high properties of micro-resistance against ultraviolet rays, abrasion, scratches, corrosion and snake.
Along with technological advancements, strict environmental regulations are increasing the demand for solid, UV resistant and waterproof coatings in global markets.