Lubricating oil by base oil and engine oil additives, commonly used lubricating oil lubricant additives according to its function, can be divided into detergent, dispersant, antioxidant, anti-wear agent and a friction modifier, etc. Engine oil additives can improve the performance of some of the internal combustion engine oil, such as clean dispersion properties, oxidation resistance, and anti-wear performance, etc., to meet the high load and high power internal combustion engine requirements for domestic combustion engine oil. Different engine oil additives in lubricating oil interactions, some interaction needed to make nature were strengthened, called a synergistic effect. Some interactions weaken the required properties and are called antagonistic impact.In the formulation of lubricating oil, the synergistic effect between additives should be made as far as possible to avoid the antagonistic impact, to reduce the number of additives, and improve the quality of lubricating oil.
Dialkyl disulfide generation of zinc phosphate (ZDDP) is a kind of multiple effect additive, anti-wear, antioxidant, corrosion resistance and performance, and it can effectively prevent engine bearing corrosion due to the high-temperature oxidation and make the oil viscosity increase, is one of the most commonly used lubricating oil lubricant additives, also is a kind of significant influence the properties of lubricating oil anti-wear lubricant additives.ZDDP oil additive is by far the most successful lubricant additives.ZDDP since the 1940 s to successful development, it has been as a kind of efficient lubricant additives used today.ZDDP oil additive is an indispensable additive in engine oils.
Other lubricant additives and ZDDP oil compound with action research
Organic molybdenum friction modifier has excellent anti-friction properties but also has specific anti-wear properties and antioxidant properties. The commonly used organic molybdenum friction modifier in internal combustion engine oil mainly includes molybdenum dialkyl dithiophosphate (MoDTP) and molybdenum dialkyl dithiocarbamate (MoDTC). The combined use of MoDTC and ZDDP results in a synergistic effect and significantly improved wear resistance. However, there is no apparent synergistic effect between MoDTP and ZDDP.
Different detergents and ZDDP have different effects on the wear resistance. Calcium sulfide alkylphenol and magnesium salicylate combined with ZDDP improved the wear resistance of oil. In contrast, calcium alkyl salicylate of medium alkali value and magnesium sulfonate of high alkali value combined with ZDDP decreased the wear resistance of oil. The dispersant of succinimide increased the chemical activity of ZDDP so that the surface reaction was more comfortable to carry out at the same temperature, and the reaction surface film generated at the same time had better temperature tolerance. The combination of succinimide and ZDDP improved the anti-wear performance of the oil. Motor oil with zinc-containing different types of dispersants had a different anti-wear performance. Oil containing polymer succinimide had the best anti-wear performance, followed by oil containing monosuccinimide, and oil-containing boride succinimide had the worst anti-wear performance. The combination of organic molybdenum anti-friction agent and ZDDP can improve the anti-wear property of oil. The improvement of wear resistance of organic molybdenum friction modifier and ZDDP compound was also related to their relevant content.
ZDDP oil is added as an antioxidant oil, so why are antioxidants added to lubricants?
With the rapid development of machinery industry and high-end equipment manufacturing industry, the use of ZDDP series and other antioxidant and anti-corrosion agents has been unable to meet the antioxidant performance requirements of high-end lubricants, and a variety of excellent shielding phenolic, amine, heterocyclic and other new ash-free antioxidant additives research and product applications develop rapidly.
What is the reason for the addition of antioxidants to lubricating oil?
Engines fueled by fuel oil, kerosene, gasoline, natural gas or human-made gas, liquefied gas, etc. must use lubricants (such as paraffin-based lubricants) to lubricate their moving parts. Lubricating oil in use to contact with air, all kinds of machinery and equipment will generate heat, make the friction parts operation temperature, besides, the apparatus of all types of metal material, such as copper, iron, etc. all can play a catalytic role in accelerating the oxidation of oil, is ultimately lubricating oil viscosity increased, generate acid corrosion of metal material, also makes a variety of carbon precipitation form or shape of asphalt material such as film block pipeline. All these changes have adversely affected the continued use of oil products and the regular operation of equipment. Therefore, oil is required to have a better antioxidant and anti-corrosion effect. The purpose of adding anti-oxygen and anti-corrosion additives to oil products is to inhibit the oxidation process of oil products, the catalytic effect of passivation metal on oxidation, and to prolong the use of oil products and protect the machine.
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