| Traditionally most lubricates is mineral base oil, the biodegradability of mineral base lubricate at nature environment is very poor. As mineral base lubricates remain and collect at environment long time, a serial environment problems will be lead, which threaten human zoology and healthy. Environment is the live base of human and other lives. With the rapid development of industry, especially in recent years, the consumption of various lubricate is increasing promptly, the gravity of environment pollution caused by mineral base oil cannot be neglectful of. It is certainly sure that studying on environment friendly lubricants would be one of the development directions in 21st century. By a lot of tests, the friction regular of several plant oils been taken for environment friendly lubricant base oil and P-antiwear additives are analyzed systemtically and roundly in the paper. By modern surface analysis technology, the friction mechanism of plant oil and P-antiwear additives in plant oil are studied, the compound properties between P-antiwear additives and other additives in plant oil are studied too. It points that taking Tribenzl Phosphate (TPP) as environment friendly lubricant has a great application prospect.The mechanism and the biodegradability of various lubricates are analyzed, it marks that the construction and comprise of lubricate are the main decisive factors of its biodegradability. By comparison to base oil andtribological property tests, it points that taking the rapeseed oil and sunflower oil for environment friendly lubricants has great development potentiality. Analyzing the worn surface by modern surface analysis technology, it reveals that the friction mechanisms of the rapeseed oil are: it forms physical adhesion film on the metal surface at low load, but forms friction polyester film at high load. By analyzing to the friction regular of P-antiwear additives in different plant oils and friction surface, the results are: TBP, TPP and ZDDP may improve plant oil's load- carrying capacity and antiwear property, TPP has better anti-wear property than TBP, ZDDP has better anti-wear property than TPP. The antiwear regular of TBP, TPP and ZDDP at various load, friction time and additive amount are obtained: TBP and TPP's optimum additive amount are 1.0% , ZDDP 's is 2.5%. The reasons of antiwear property and load-carrying capacity of phosphatide/plant oil systems are the plant oil forms physical adhesion film, chemical adhesion film and polyester film reacted with metal on the metal ball surface. In addition, the results of friction reaction such as phosphatide hydrolysis, the resultant phosphoric acid iron-phosphorus reacted with metal surface- ect. ,comprise extreme press critical lubricate film. The antiwear action of ZDDP in plant oil is closely relate to its thermal resolution, on the one hand the thermal resolution product forms deposit film, on the other hand, chemical reaction during friction process results ferric-oxide, sulphate and phosphate which form polymer film. ZDDP can modify the friction surface and form Fe-Zn solid melt which increases the friction surface'santiwear property. A tribological model of tnphenyl phosphate (TPP) acted on rapeseed oil by ANN is established. Compound property between TPP , ZDDP and other additives on rapeseed oil are studiedby test: TPP has good compound property with OCP7065, T803B and T152, ZDDP has good compound property with CuDDP, T115A, TPP has good compound reduction property with T102.
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