高碱值磺酸锂的合成及其在SD15W/40和CD15W/40油品中的应用

采用正交实验获得了高碱值磺酸锂合成的优化条件，并进行了中型放大；比较了各种高碱值磺酸盐应用于15W/40多级油的性能。结果表明，高碱值磺酸锂合成的优化工艺条件为助剂4g、脱水率100％、促进剂用量25mL、二氧化碳通入量100％。高碱值磺酸锂的硫酸盐灰分为0.34%，在各种清净剂中最少，金属腐蚀性最低，高温清净性、抗泡性最好，抗氧化安定性与高碱值磺酸镁相近，抗磨性较差。随着高碱值磺酸锂单剂用量从0增加到0.6g，SD15W/40油品的清净性逐渐变好，抗磨性变化不大，抗氧化性略微变坏，分散性能基本不变；随着高碱值磺酸锂从0增加到0.6g，CD15W/40油品的高温清净性进一步变好，氧化诱导期基本不变，抗磨性略微降低。

Synthesis of Overbased Lithium Sulfonate and Its Application in SD15W/40 and CD15W/40 Oil Formulations

The synthesis conditions of overbased lithium sulfonate were optimized with perpendicularity experiments and the pilot experiments under the optimized conditions were carried out.Various performance of lithium sulfonate and other sulfonate in 15W/40 multi-grade oil were evaluated.It is found that the optimized synthesis conditions of overbased lithium sulfonate were 4 g co-promoter,100% dehydrate rate,25 mL promoter and 100% dosage of carbon dioxide.Being compared with other sulfonates,overbased lithium sulfonate produced 0.34% sulphate ash,which was the least one among detergents,and exhibited better anti-corrosive ability,the best detergency and bubble performance,and also moderate anti-oxidation ability and worse anti-wear performance.When overbased lithium sulfonate was used as low ash detergent in oil formulations,SD15W/40 exhibited best detergency,steady anti-wear ability and little worse oxidization ability,steady dispersity,while CD15W/40 oil exhibited the best detergency,steady oxidization performance and little worse anti-wear ability along with the increase of lithium sulfonate dosage from 0 to 0.6 g.