The direct method was used to prepare polyurea lubricating grease, and the effects of several different types of additives on the extreme pressure and anti?wear performance for polyurea lubricating grease were investigated and studied. The results demonstrate that several types of additives have good compatibility with polyurea grease, and they have little undesirable influence on colloidal stability of polyurea grease, and they can also enhance thermal stability of polyurea grease. Moreover, the addition of additives can significantly improve the performance of extreme pressure and wear resistance for polyurea lubricating grease. And in the experiments, it was found that the composite multifunctional additive containing sulfur and phosphorus has a relatively better effect on improving the extreme pressure and wear resistance of polyurea lubricating grease. The research results can provide a reference basis for the improvement of extreme pressure and anti?wear property for polyurea lubricating grease, achieving a relatively optimized comprehensive performance, thereby enhancing its practical utilization performance under the harsh working conditions for high load and high speed mechanical equipment.

Using Fe(NO₃)₃·9H₂O, H₃PO₄, Na₂MoO₄·2H₂O, 3?aminomethylpyridine as raw materials, a complex 1 based on the hourglass phosphomolybdate modified with Fe^Ⅱ was successfully synthesized by hydrothermal synthesis method. The molecular formula is (C₆H₁₀N₂)₆{Fe[Mo₆O₁₂(OH)₃(PO₄)₂(H₂PO₄)₂]₂}·3.5H₂O. The single crystal X?ray diffraction infrared spectroscopy(FT?IR) powder X?ray diffraction(PXRD) and thermogravimetric analysis(TGA) were used to prove its structure and composition which was analyzed at the same time The results show that complex 1 has a three?dimensional supramolecular framework, which connected {Fe[P₄Mo {}_{\mathrm{6}}^{\mathrm{V}} O₃₁]₂} {}^{\mathrm{22}-} (denoted as {Fe(P₄Mo₆)₂}) and protonated 3?aminomethylpyridine by five hydrogen bond interactions of N(6)—H(6B) ···O(15) ，N(6)—

H(6A)···O(8)， N(2)—H(2C)···O(23)， N(2)—H(2B) ···O(19) and N(1)—H(1A) ···O(30). Besides, the electrochemical detection of furaltadone hydrochloride was further studied by using complex modified carbon paste electrode(1?CPE). The experimental results show that 1?CPE has good stability and high selectivity for furaltadone hydrochloride.