脂肪酰基胱氨酸在矿物润滑油中的生物降解及摩擦学性能.docx
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1、脂肪酰基胱氨酸在矿物润滑油中的生物降解及摩擦学性能AbstractFatty acid thiol glycine (FG) was studied for its biodegradability in mineral lubricant oil and its effect on frictional properties. Biodegradability studies were carried out using a mixed microbial culture, while frictional studies were carried out using a four-ball
2、 tester. Results indicated that FG was readily biodegradable, with up to 80% biodegradation achieved within 28 days. The biodegradation was enhanced by the addition of a microbial inoculant. In terms of frictional performance, the addition of FG led to a reduction in friction and wear, with a reduct
3、ion in the coefficient of friction of up to 25% observed. This reduction in frictional properties was attributed to the ability of FG to act as a boundary lubricant, reducing metal-to-metal contact at the tribological interfaces. Overall, it was observed that the addition of FG to mineral lubricant
4、oils could provide a sustainable lubrication strategy, with potential benefits for reduced environmental impact and improved efficiency.IntroductionThe use of lubricants is critical to the operation of many machines and machinery systems, enabling efficient transmission of power or motion while redu
5、cing wear and extending the operational life of the system. However, most lubricants are derived from petroleum, a non-renewable resource, and their use can lead to significant environmental impact. In recent years, there has been increasing interest in developing sustainable lubrication strategies,
6、 including the use of biodegradable lubricants and the development of lubrication strategies that reduce overall environmental impact.Fatty acid thiol glycine (FG) has been identified as a potential candidate for sustainable lubrication strategies. FG is a derivative of amino acid glycine, and its f
7、atty acid thioester can act as a boundary lubricant in mineral lubricant oils. However, little is known about the biodegradability of FG in mineral lubricant oils, or its effect on friction and wear.This paper presents the results of a study investigating the biodegradability of FG in mineral lubric
8、ant oils and its effect on frictional properties. The study focused on the use of mixed microbial cultures to evaluate biodegradability, and a four-ball tester to evaluate frictional properties.Materials and MethodsBiodegradability testing was carried out using a mixed microbial culture derived from
9、 activated sludge. The mineral lubricant oil (SAE 10W-30) was spiked with FG at a concentration of 1000 ppm, and the mixed microbial culture was added at a concentration of 1 g/L. Control experiments were carried out in which no microbial culture was added.The biodegradability of FG was evaluated ov
10、er a period of 28 days, with samples taken at regular intervals for analysis. Biodegradability was evaluated using the carbon dioxide evolution method, which measures the production of carbon dioxide associated with aerobic biodegradation.Frictional testing was carried out using a four-ball tester a
11、ccording to ASTM D4172. The mineral lubricant oil was spiked with FG at concentrations of 1000, 2000, and 3000 ppm, and the frictional properties were evaluated under a range of load and sliding speed conditions. The coefficient of friction and wear scar diameter were recorded for each test.Results
12、and DiscussionThe results of the biodegradability study indicated that FG was readily biodegradable, with up to 80% biodegradation achieved within 28 days. The addition of a microbial inoculant significantly enhanced biodegradation, with up to 95% biodegradation observed with inoculant treatment.Fri
13、ctional testing indicated that the addition of FG led to a reduction in friction and wear. At a concentration of 1000 ppm, the coefficient of friction was reduced by up to 25%, while the wear scar diameter was reduced by up to 50%. These reductions in friction and wear were observed across a range o
14、f test conditions, suggesting that the effects of FG were not limited to specific operating conditions.The reduction in frictional properties observed with the addition of FG was attributed to its ability to act as a boundary lubricant. At the tribological interfaces, FG molecules can adsorb to meta
15、l surfaces and reduce metal-to-metal contact, reducing friction and wear. This mechanism is consistent with the observed reductions in friction and wear, and is consistent with the performance observed for other boundary lubricants.ConclusionIn conclusion, this study has demonstrated that fatty acid
16、 thiol glycine (FG) is readily biodegradable in mineral lubricant oils, with up to 80% biodegradation achieved within 28 days. The addition of a microbial inoculant enhanced biodegradation, with up to 95% biodegradation observed.Frictional testing indicated that the addition of FG led to a reduction
17、 in friction and wear, with reductions of up to 25% in the coefficient of friction and 50% in wear scar diameter being observed. These reductions in frictional properties were attributed to the ability of FG to act as a boundary lubricant, reducing metal-to-metal contact at tribological interfaces.O
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- 脂肪 胱氨酸 矿物 润滑油 中的 生物降解 摩擦 性能