Performance requirements of the hottest lubricatin

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(1) proper viscosity and good temperature resistance. The viscosity of lubricating oil is related to the starting performance of engine, the wear degree of parts, the consumption of fuel and lubricating oil and the size of power loss. The oil viscosity is too large, the fluidity is poor, and the time required to enter the friction surface is long, the fuel consumption will increase, the wear of parts will increase, and the cleaning and cooling performance are poor, but the sealing performance is good; The viscosity is too small to form a reliable oil film, cannot maintain lubrication, poor sealing, high wear, and power reduction. Therefore, the viscosity is too large or too small, which should be appropriate. The working temperature range of engine lubricating oil is very wide, and it is required to have enough viscosity to ensure lubrication at about 300 ℃; It is required to have sufficient liquidity below 0 ℃ or even -40 ℃ to ensure smooth startup. Therefore, good viscosity characteristics and temperature resistance are required

(2) good cleaning and dispersion performance. Excessive dirt such as sludge produced by the lubrication system will be separated from the oil, resulting in clogging of the oil filter and oil hole, poor fluidity of the oil, adhesion of the piston ring, increased fuel consumption, reduced power and other phenomena. In order to prevent the above failures, oil soluble detergent dispersant must be added to the lubricating oil. Detergent dispersants are mainly divided into metal detergent and ashless dispersant. Among them, the metal type detergent dispersant can prevent the deposition of oil sludge in the piston ring groove, and has good detergent ability in the piston ring area. When used alone, it is called detergent; Ashless detergent has poor ability to prevent sludge in the ring groove, but it has a strong ability to promote the dispersion of sludge in the oil with the increase of formula number. Sometimes it is called dispersant alone. The two are best used in combination. Title The qualified candidates needed by the organization

(3) most of the good lubricating engines use sliding bearings, and they have to bear a lot of load, such as the main bearings are 510mpa (steam) and MPa (diesel), the connecting rod bearings are MPa (steam) and MPa (diesel), and some parts can reach 90Mpa. Engine lubricating oil must have good lubricity under high load and high pressure

(4) with good acid neutralization, fuel oil, especially diesel oil, contains a large amount of sulfur. The acid gas hr15n produced after combustion combines with water to form sulfuric acid or sulfite and other solutions. These acids will corrode the metals in the engine. Therefore, the lubricating oil is required to have a good neutralization ability with acid to reduce the damage of acid substances produced by combustion to the engine

(5) good oxidation resistance and thermal oxidation performance. Lubricating oil will combine with oxygen at high temperature, and its oxidation products will deteriorate the lubricating oil and make it unsuitable for glass fiber fabric to enhance the effect of thermoplastic and thermosetting plates, which is one of the main reasons for many engine failures. Various anti-oxidation 1234 additives should be added to the lubricating oil to avoid its oxidative deterioration

(6) good resistance to foam due to the strong agitation and splash lubrication of the crankshaft, it is easy to generate bubbles in the lubricating oil, reduce the lubrication performance, and cause oil pump failure. Therefore, good foam inhibitor products must be added to the lubricating oil to inhibit the generation of foam and maintain the efficacy of the lubricating oil