Abstract: A benzothiazolinethione derivative containing boron—N-methoxyl-2-benzothiazolinethione-N,N-diox-ethylamine borate (BTLB) was synthesized. The tribological performance of BTLB in rapeseed oil was evaluated by four-ball tester. The results showed that BTLB used as lube additive even at a low dosage range of 1.0~1.5% could improve the antiwear, friction reduction and extreme pressure properties of the base oil significantly. The morphologies of the worn surface of the tested steel balls were investigated by SEM technique. Results showed that as compared with the base case, the worn surface lubricated with BTLB was much uniform and smooth with shallow furrows, which indicated that BTLB possessed good anti-wear function.

Key words: additive, abrasion resistance, friction coefficient, rapeseed oil