Pour point depressant mechanism of lubricating oil composite additives
Pour point depressant is a chemically synthesized polymer or condensate. Its molecules generally contain polar groups (or aromatic nuclei) and alkyl chains similar to paraffin hydrocarbons. Pour point depressant can not prevent paraffin from crystallization and precipitation at low temperature, that is, the cloud point of oil remains unchanged. It changes the shape and size of wax crystal by adsorption on the wax crystal surface or eutectic with wax, so as to prevent wax from forming three-dimensional network structure and maintain the flow capacity of oil at low temperature. It should be emphasized that the pour point depressant can only take effect in the oil containing a small amount of wax. The oil without wax or too much wax has no pour point depressant effect. The most commonly used pour point depressant is methyl dimethacrylate
Mechanism of antirust and preservative
Antirust agent is a compound with strong polarity. Its polar group has strong adsorption force on the metal surface, forms a tight single molecule or multi molecule protective layer on the metal surface, prevents the corrosion medium from contacting with the metal, and plays the role of antirust. In addition, the base oil dissolving the antirust agent can be adsorbed where the antirust agent has less adsorption, go deep into the molecules of antirust additives, and make the adsorption film more firm with the help of van der Waals force and additive molecules; In addition, due to the function of base oil, the adsorption of additives on the metal surface is more firm and not easy to separate. The oil can also form a concentrate with additives, so as to make the adsorption film closer. In short, these functions of base oil are conducive to protecting adsorbed molecules, maintaining oil film thickness and playing a certain role in rust prevention. The most commonly used corrosion inhibitors are barium sulfonate, calcium sulfonate, modified calcium sulfonate, amine borate and amine carboxylate.
It mainly refers to the performance of lubricant to reduce friction. The additives used for the purpose of improving this performance are called oilness agents, sometimes referred to as friction reducer or friction improver. Some surfactants are used as oiliness agents, such as animal and vegetable oils, fatty acids, esters, amines, etc.
It refers to the ability of lubricant to form film on friction surface and prevent wear under light load and medium load conditions. Such as: sulfurized grease, phosphate ester, dithiophosphate metal salt.
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