Biodegradability Study Of Bio-based Lubricants

Bio-based lubricating oil is the development trend of lubricating oil in the future.Compared with mineral-based lubricating oil,it not only has good lubricating properties,but more importantly,it has good biodegradability.However,at present,there is no unified standard measuring the biodegradability of lubricating oil in China.In this paper,the degradation rates of cottonseed oil and mineral oil white oil were respectively determined to be 98.5%and 28.2%referring to the CEC L-33-A-93 standard of the Coordinating of European Council,and the strains were screened to obtain three bacteria B1,B2,B3 from activated sludge,and then compared the effects of the three cultures alone and co-culture on cottonseed oil and mineral oil,and found that the co-culture degradation between the strains is better,B1,B2,B3,B1+B2+B3 The degradation rates of cottonseed oil are 60%,11%,55%and 95%,respectively.Therefore,it can be proved that degradable microorganisms have the synergistic effect between each other.In order to gain a deeper understanding of the biodegradability of different ester base oils,the use of activated sludge to study dibasic acid diesters,triglycerides and trimethylolpropane esters revealed that the chain length of the ester directly affects The biodegradability is fast,the esters below 30 carbon can degrade more than 80%on 9 d,diacid diester>TMP trimester>triglyceride,and the degradation process is studied by 16S rRNA high-throughput sequencing.The structure of the degradation group of its three types of esters has found that a large number of common microbial populations play a role,and the common dominant bacterial flora includes:Doxorubicin,Neosporosporium,S.faecalis and Tufts.Monocytogene(including genus Acidophilus,Methylibium,phage,Rhodophyllum,and Coxiellaceae),which play a decisive role in the degradation of biobased base oils.Analysis and comparison found that the dibasic acid diester can degrade more than 80%in about 9 d,and the triglyceride and TMP triester need 17 d or more.In this paper,we want to use TMP trioleate and three kinds of additives to compound a hydraulic oil with excellent friction performance.Two sets of experiments(three additive blending and corresponding performance)were designed by designer,and these data were used as the training data of BP neural network.The correlation coefficient R2 is 0.9209,0.9356,0.9723,0.9775,respectively,both greater than 0.9,so the model has good generalization ability.Using this model combined with genetic algorithm optimization to obtain the best compounding of additives when AW34,AW38,AW 12 are 0.27%,respectively 0.12%,0.60%,TMP trioleate is 99.01%,the overall performance is the best,the average friction coefficient is 0.0791,the average wear spot diameter is 0.4008 mm,the disc wear volume is 0.9953×105 ?m3,and the extreme pressure is 1543 N.