水溶性聚合物—烷基聚乙二醇酯磷酸锌盐的摩擦性能

Study of the Tribological Properties of Water-soluble Polymers -Zinc (Polyethylene glycol alkylate) Phosphate

合成了三种烷基聚乙二醇酯磷酸锌水溶性润滑添加剂。研究表明,分子中聚乙二醇作为水溶性基团,分子量以1000为宜,分子量太小,聚合物在水中溶解性差,影响其润滑性能;分子量过大,导致单位重量聚合物中疏水基团含量相对减少,同样影响其润滑性能。作为油性剂作用的疏水基团,润滑性能优劣顺序为:C17H35->C11H23->C7H15-。金属元素作为活性元素,铈的抗磨性能优于锌的抗磨性能。一个分子中同时具有亲水性、疏水性、反应性等几类官能团,则兼具油性剂和极压剂功能,是性能优良的水溶性润滑添加剂。

Three complexes of zinc (cerium) with (polyethylene glycol alkylate) phosphate used as watersoluble lubricating additives were synthesized. Their structures were characterized by IR spectra. Their tribological behaviors in high waterbased fluids were evaluated by using fourball machine. Their lubrication properties were influenced by the molecular weight and the chain length of hydrophibic group. The Mnof polyethylene glycol should be appropriate as 1 000, which acting as water soluble group. The low Mn resulted in the poor watersolubility of polymer and influenced the lubrication property, while the Mnis too high, the hydrophobic group of unit weight polymer decreased and lead to the poor lubrication property. The longer the chain of the hydrophobic group, the better the lubrication property of the polymer. That is, the order of lubrication property was as follows: LP(C17H35) >LP(C11H23-) >LP(C7H15). The antiwear property of the polymers with the active metal element of cerium were better than that of polymers with zinc. High efficient water soluble lubricant additives with the functions of oiliness agent and extreme pressure agent to include water soluble groups, hydrophobic groups and reactive groups in a molecule at the same time.