Carboxylated detergent-dispersant-containing compositions having improved properties in lubricating oils
申请人:——
公开号:US20030195126A1
公开(公告)日:2003-10-16
A lubricant additive composition comprising (a) a carboxylated detergent-dispersant obtained by (i) neutralizing alkylphenols using an alkaline earth base in the presence of at least one carboxylic acid that contains from one to four carbon atoms but in the absence of alkali base, dialcohol, and monoalcohol, forming an intermediate product, then (ii) carboxylating the intermediate product using carbon dioxide so that at least 20 mole percent of the original alkylphenol starting material has been converted to single aromatic-ring hydrocarbyl salicylate; and (b) an overbased, non-sulfonate-containing detergent such as, for instance, a hydrocarbyl phenate-carboxylate; a medium overbased salicylate having a total base number of about 50 to 170; a high overbased salicylate having a total base number greater than 170; or an overbased sulfurized hydrocarbyl phenate of alkaline earth metals; and combinations and mixtures thereof. Also provided for are additive packages and finished lubricating oil compositions comprising the same. The compositions of this invention reduce sludge and contaminant formation, especially in low and medium speed diesel engines and in marine diesel engines.
一种润滑油添加剂组合物,包括(a)一种羧基化的洗涤剂-分散剂,其制备方法是:(i)在至少一种含有一至四个碳原子的羧酸存在下,但不含碱基、二元醇和一元醇的情况下,用碱土碱中和烷基酚,形成中间产物,然后(ii)用二氧化碳羧化中间产物,使至少 20 摩尔%的原始烷基酚起始原料转化为单芳香环烃基水杨酸酯;(b) 过基、不含磺酸盐的洗涤剂,例如,烃基苯甲酸酯;总碱数约为 50 至 170 的中等过基水杨酸酯;总碱数大于 170 的高过基水杨酸酯;或碱土金属的过基硫化烃基苯甲酸酯;以及它们的组合和混合物。此外,本发明还提供了复合添加剂和包含复合添加剂的成品润滑油组合物。本发明的组合物可以减少油泥和污染物的形成,尤其是在中低速柴油发动机和船用柴油发动机中。