Abstract
Plastics are widely used owing to their light weight, easy production, and low cost. Even though plastics find application in different fields of industries and households, they do not degrade easily. If plastics are not disposed of appropriately, it has been shown that they cause widespread environmental pollution, which poses risks to human health. Recycling waste plastics has been an alternative to mitigating plastic pollution, which usually requires high labour costs and produces contaminated water during processing. If plastic recycling will contribute to the development of tribological products like lubricating oils, it is a safer alternative to disposing of plastics in the environment. In order to understand the tribological use of plastics by recycling, the present study reviews different techniques that can be employed to transform waste plastics into petroleum-based oils. The viscosity, density, and friction of pyrolyzed waste plastic oils are investigated and compared with commercial lubricants to assess their potential lubrication applications. The segregation processes, catalytic isomerization dewaxing, and Fischer–Tropsch method to recycle waste plastics are also reviewed to provide an insight into the methods to transform pyrolyzed waste plastic into lubricants.
Highlights
Plastics have been an important material in the routine life of humans since 1907, when the first synthetic plastic was produced in New York
The results indicate that the kinematic viscosity of the mixed waste polymer pyrolyzed oil (1)
The results indicate that the susceptibility of surfaces to wear and corrosion in bio-lubricants causes the surfaces to become brittle, which can be mitigated by employing the mixed waste polymer pyrolyzed oil
Summary
Plastics have been an important material in the routine life of humans since 1907, when the first synthetic plastic was produced in New York. The oil produced from the pyrolysis of waste polymer plastics can be a potential substitute lubricant compared with conventional mineral and vegetable lubricants. To understand the potential of oil from waste polymer plastics, the kinematic viscosity values obtained at a fixed temperature are compared against other bio and petroleum-based lubricants. Khan et al [5] carried out a pyrolysis process on waste high density polyethylene (HDPE) polymer plastics and the oil produced from this process was observed to have a kinematic viscosity value of. It was observed that the kinematic viscosity values of the pyrolyzed waste HDPE polymer plastic oil and bio-lubricants were in the same range. A study conducted on friction, viscosity, and density of pyrolyzed waste plastic-based oils for lubricant application is discussed and compared to similar bio-lubricants and motor oils
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