目的 以食品级润滑脂代替普通润滑脂，减少非食品级润滑脂带来的食品安全问题，并提高复合铝基脂的减摩抗磨性能。方法 通过白油和稠化剂制备了复合铝基脂，通过DHR-2流变仪和Q500TGA热重分析仪，考察了白油和复合铝基脂的黏度和质量损失随温度的变化关系。配制含不同质量分数聚四氟乙烯(PTFE)的混合铝基脂，在MFT-5000摩擦试验机上开展摩擦性能研究，探讨其对食品级润滑脂减摩抗磨性能的作用机制。结果 复合铝基润滑脂的滴点约为220 ℃，锥入度为230(0.1 mm)，热分解温度为245 ℃。随着聚四氟乙烯质量分数的增加，混合脂的摩擦因数以及圆盘磨损体积均呈先减小后增大的变化;当聚四氟乙烯的质量分数为5%时，对应的平均摩擦因数和磨损体积分别降低了27.9%和53.4%，并优异于市场上食品级复合铝基脂PURITY FG2的摩擦学性能。结论 复合铝基润滑脂具有良好的理化性能，聚四氟乙烯显著改善了复合铝基脂的减摩抗磨性能。含5% PTFE混合脂最有可能被应用到食品装备等领域，并将为新型食品润滑材料的研发提供参考。

This work aims to improve the friction and wear resistance of aluminum complex grease. Food safety damages are reduced afterwards by replacing ordinary greases with food grade ones. Aluminum complex grease was prepared by white oil and certain thickener. The temperature dependence of viscosity and quality of white oil and aluminum complex grease were investigated by DHR-2 rheometer and Q500TGA thermogravimetric analyzer, respectively. Tribological properties of mixed aluminum grease containing PTFE with various mass fractions are assessed by MFT-5000 rub tester. The results show that the drop point of the aluminum complex grease was around 220 ℃, and the cone penetration and its thermal decomposition temperature was 230 (0.1 mm) and 245 ℃, respectively. With the increase of the PTFE mass percent, friction coefficient of the mixed grease and wear volume of disk firstly decreased and then increased. When the mass fraction of PTFE reached 5%, the average coefficient of friction and wear volume were reduced by 27.9% and 53.4%, and the performance is better than those PURITY FG2 food grade aluminium complex grease in the market. As a conclusion, the aluminum complex grease possesses good physical and chemical properties, and PTFE can significantly improve its friction and wear resistance. Mixed grease containing 5% PTFE is most likely to be used in the field of food equipment, and this research will provide references for the development of new food lubricating materials.