The Green 10w/40sh Gasoline Engine Lubricants Pilot Study

Gasoline engine oil is one of lubrications that is used popularly and can be promoted to higher quality grade at a quickest speed with the worst working conditions. The fundamental degradable reason of the gasoline engine oil is the oxidation, which directly gives rise to the occurring of the deposit, the aggravation of the wear and tear and the increase of the foam. The gasoline engine oil usually works at high temperature of 80- 250C. It may occur chemical reactions such as burning, oxidation, resolving and condensation. These reactions make the gasoline engine oil decline, degrade, go bad and lose lubricant performance. The reaction' s products including organism and inorganic acid compound would corrode metal and aggravate the wear and tear. Therefore, the gasoline engine oil should have good detergent and disperse ability and high temperature oxidation stability in order to guarantee its lubrication and prolong the period for oil-changing.With the enhancement of the environmental protection consciousness and the legislation for the environmental protection in recent years, people pay more and more attention to the problem of the environmental pollution caused by the gasoline engine oil. In 1970s, foreign countries took the lead in research on the green lubricant and enacted the relative laws and regulations to restrict the exhausting of the gasoline engine oil. There is a bigger difference between China and foreign countries on the development of the gasoline engine oil whether on the species or on the quality. The research and manufacturing of top-graded gasoline engine oil is just in the start stage. The high temperature oxidation stability is the bottleneck of the research and manufacturing of the green lubricant whose base oil is the well-biodegraded vegetable oil. Thus, it will be of the most challenge to research and develop a new kind of green gasoline engine oil, which meet the environmental protection standard.The primary study contents are as follows:1. Deeply studied on the friction mechanism of the gasoline engine and the lubrication mechanism of the main tribo-pairs of the engine. Established the compound lubrication model for the cylinder -piston ring, and the oil film thickness equation for the crankshaft, connecting rod and bearing.2. Inquired into the function, and the work conditions of the gasoline engine oil. The performance evaluation norm, the viscosity degree ratings and the quantity classification etc. of the gasoline engine oil were studied too. At last, the using performance and selecting principle were induced.3. Investigated the influence of the base oil and additives on the modern gasoline and the compatibility among the additives based on the data of the tests including ball rust test (BRT), oxidation stability test (TFOUT), greasy filth formation and valve wearing test of VE sequence. The research indicates that the base oil and additives must be carefully investigated and balanced in order to meet the demands of modern gasoline engine oil's performance.4. Studied on the biodegradability of the green gasoline engine oil. Concluded that the vegetable oil, especially the high oleic sunflower oil and the rape oil with low content of crucic, the 2-ester and thepoly-ester should be the first selected base oil for the degradable gasoline oil. Additives have a certain influence on the biodegradability of the base oil and the formula of them must be optimized so as to meet the biodegradable needs and the antioxidant stability. Introduced main methods of the biodegradability evaluation - they are series of 0ECD301, CEC-L-33-A-93 experiment, and EPA560/6-82-003 " Shake Flask".5. By analyzing the lubricating mechanism and biodegradable performance that the biodegradable gasoline engine oil demands, base oil and additives were chosen reasonably and scientifically. The uniform design of experiment was used to arrange multi-level and multi-factor experiments. The stepwise technique is adopted to put forward the regression equation. Based on all of these, the sensitivity...