A kind of polyalpha-olefin base oil and preparation method thereof

Abstract

The present invention relates to a method for preparing a poly-alpha-olefin base oil, comprising the following steps: S1, at a temperature of 50° C. to 120° C., a pressure of 0.1 to 1.0 MPa, and a volume ratio of alpha-olefin to solvent of 1:0 to 1:1 condition, with Cr-AlCl 3 / Al 2 O 3 The solid-supported catalyst catalyzes the oligomerization reaction of the α-olefin mixture for 3 to 8 hours; S2, after the reaction is stopped, the catalyst is filtered, washed with distilled water, the solvent is removed by atmospheric distillation, and the unreacted α-olefin and some α-olefin dimerization are removed by vacuum distillation After hydrogenation, polyα-olefin base oil is obtained. The present invention also relates to polyalpha-olefin base oils prepared by the above method. The PAO base oil prepared by this method needs a kinematic viscosity of 30-40mm at 100℃ 2 PAOs in the / s viscosity range do not need to be mixed with low-viscosity PAO oils, which can greatly reduce the volatility of lubricating oils.

Description

technical field

[0001] The invention relates to the field of olefin polymerization, in particular to a polyalpha-olefin base oil and a preparation method thereof. Background technique

[0002] During most of the 20th century, the quality of lubricating oil was basically guaranteed by the combination of mineral base oils obtained from crude oil through various traditional "separation processes" and various additives. Since the 1970s, with the technological progress of various engines and other mechanical equipment and the increasingly urgent "energy saving" and "environmental protection" requirements, the viscosity-temperature (marked by viscosity index), volatility, The main properties such as thermal-oxidative stability have put forward increasingly stringent requirements, so that the synthetic base oil obtained by the synthesis and hydrochemical conversion process has been developed.

[0003] According to the classification of API base oil, PAO (poly-alpha-olefin) is a cl...