极压抗磨剂对复合锂钙基润滑脂性能及结构的影响

The Influence of Extreme-pressure and Anti-wear Agent on Performance and Structure of Complex Lithium and Calcium Base Grease

通过复合锂钙基润滑脂在加入极压抗磨添加剂前后的性能及结构变化,研究了极压抗磨剂对润滑脂的影响。结果表明:在标准实验条件下,极压抗磨剂磷酸三甲酚酯(T306)、二烷基二硫代磷酸锌(T202)、二丁基二硫代氨基甲酸钼(T351)、硫化异丁烯(T321)、硼酸钠(T361)等组合可大幅提高润滑脂的极压抗磨性能,对结构及其它性能无明显影响;在加水10%剪切10万次条件下,含上述极压抗磨剂组合的润滑脂的结构及性能变化比较明显,其复合结构被破坏,滴点大幅下降,含T361的脂极压性下降最多;经过高温后(180℃,24 h)含上述极压抗磨剂组合的润滑脂,能保持或提高原有的极压抗磨性,润滑脂的复合结构没有明显改变,润滑脂的稠化剂纤维结构破坏较大,一般会造成润滑脂的硬化。

The change of structure and pcrformance before and after adding the extreme-pressure and anti-wear agents into complex lithium and calcium base grease was studied. The results show that in the standard experimental conditions, the combined agents of tritolyl phosphate, zinc dithiophosphates, molybdenum dibutyldithiocarbamate, sulphide isobutene, sodium borate can improve the extreme-pressure and anti-wear performances of grease, but they have no visible influence on the other performances of complex lithium and calcium base grease. Under the conditions of adding 10% water and after 100 000 stroke penetration, the structure of complex lithium and calcium base grease with the combined agents is destroyed, the dropping point is reduced greatly; the extreme-pressure performance of the grease containing borate is reduced obviously. In high-temperature condition （ 180 ℃ , 24 hour） , the combined agents would maintain or raise extreme-pressure and anti-wear performance of complex lithium and calcium base grease;the complex structure of grease does not change, but the long fibre structure of thickener is destroyed ,which usually results in grease hardening.