Additives for improving the low temperature flow properties and oxidative stability of hydrocarbon oils are disclosed, which comprise the condensation reaction product of alkylated phenol and sulphurising agent, wherein:
(a) the polymer composition has a number average molecular weight of at least 3,000 and a molecular weight distribution of at least 1.5;
(b) in the alkylated phenol reactant the alkyl groups (i) are essentially linear, (ii) have between 6 and 50 carbon atoms, and (iii) have an average number of carbon atoms between 12 and 26, and
(c) not more than 10 mole % of the alkyl groups on the alkylated phenol have less than 12 carbon atoms and not more than 10 mole % of the alkyl groups or the alkylated phenol have more than 26 carbon atoms. The additives may also be produced in a branched backbone form in which monomer reactants are copolymerised with certain tri- or tetrafunctional comonomers. Blends of these additives with various hydrocarbon oils, and particularly various middle distillates and lubricating oil compositions, whose low temperature flow properties and oxidative stability are significantly improved thereby, are also disclosed.
本发明公开了用于改善烃类油低温流动性能和氧化稳定性的添加剂,该添加剂由烷基化
苯酚和
硫化剂的缩合反应产物组成,其中
(a) 聚合物组合物的平均分子量至少为 3000,分子量分布至少为 1.5;
(b) 烷基化
苯酚反应物中的烷基 (i) 基本上是线性的,(ii) 有 6 至 50 个碳原子,(iii) 平均碳原子数在 12 至 26 之间,以及
(c) 烷基化
苯酚上不超过 10 摩尔%的烷基具有少于 12 个碳原子,且不超过 10 摩尔%的烷基或烷基化
苯酚具有多于 26 个碳原子。添加剂也可以支链骨架形式生产,其中单体反应物与某些三官能团或四官能团共聚。此外,还公开了这些添加剂与各种烃油,特别是各种中间馏分油和润滑油组合物的混合物,其低温流动性能和氧化稳定性因此得到显著改善。