阅读说明：本技术 一种润滑油抗氧剂组合物 (Antioxidant composition for lubricating oil ) 是由 李维民 马瑞 王晓波 陈云龙 于 2020-06-19 设计创作，主要内容包括：本发明公开了一种润滑油抗氧剂组合物,该组合物由胺类抗氧剂和四烷基鏻磷酸酯离子液体以1：100～100：1配比组成,本发明提供的润滑油抗氧剂组合物在合成酯基础油中具有优异的抗氧化性能,能够显著提升基础油的氧化诱导期,延长润滑油的使用寿命,特别适用于高温要求苛刻的润滑工况。(The invention discloses an antioxidant composition for lubricating oil, which is prepared from amine antioxidant and tetraalkyl phosphonium phosphate ionic liquid in a weight ratio of 1: 100-100: 1 proportion, the lubricating oil antioxidant composition provided by the invention has excellent antioxidant performance in synthetic ester base oil, can remarkably prolong the oxidation induction period of the base oil, prolongs the service life of lubricating oil, and is particularly suitable for lubricating working conditions with harsh high-temperature requirements.)

1. The lubricating oil antioxidant composition is characterized by comprising an amine antioxidant and a tetraalkyl phosphonium phosphate ionic liquid.

2. The lubricating oil antioxidant composition of claim 1, wherein the weight ratio of the amine antioxidant to the tetraalkyl phosphonium phosphate ionic liquid is 1: 100-100: 1.

3. the lubricating oil antioxidant composition as claimed in claim 2, wherein the weight ratio of the amine antioxidant to the tetraalkyl phosphonium phosphate ionic liquid is 1: 10-10: 1.

4. the lubricating oil antioxidant composition of claim 2, wherein the amine antioxidant is one of a linear or branched alkyl substituted diphenylamine or an alkylated phenyl-alpha-naphthylamine.

5. The lubricating oil antioxidant composition of claim 4, wherein the linear or branched alkyl-substituted diphenylamine or alkylated phenyl-alpha-naphthylamine is one of butyl/octyl diphenylamine, dioctyl diphenylamine, N-phenyl-alpha-naphthylamine, octyl phenyl-alpha-naphthylamine, and polymers of dioctyl diphenylamine and octyl phenyl-alpha-naphthylamine.

6. The antioxidant composition for lubricating oil as claimed in claim 1, wherein the tetraalkyl phosphonium phosphate ionic liquid has a structural formula shown in formula (1),

wherein R1, R2, R3 and R4 are alkyl groups with 4-14 carbon atoms.

7. The lubricating oil antioxidant composition of claim 6, wherein the tetraalkyl phosphonium phosphate ionic liquid is one of tributyl tetradecyl phosphonium dioctyl phosphate ionic liquid, trihexyl tetradecyl phosphonium dioctyl phosphate ionic liquid, and tetraoctyl phosphonium dioctyl phosphate ionic liquid.

Technical Field

The invention relates to a lubricating oil antioxidant composition, and belongs to the technical field of lubrication.

Background

With the development of modern mechanical equipment design towards small volume, high speed, high load and high power, the working conditions of lubricating oil are increasingly harsh, and higher requirements are put forward on the oxidation stability of the lubricating oil, so that efficient, novel, multifunctional and composite antioxidants need to be developed to meet the requirements. The composite antioxidant has the advantages of good effect, good comprehensive performance and full synergistic effect of various additives, can often obtain the service performance which can not be achieved by a single agent, and can meet the requirement of harsher service conditions on the oxidation resistance of the lubricant. The development of the composite antioxidant is more and more important in the antioxidant of the lubricating oil, and is the development trend of the antioxidant in the future.

The complex antioxidant composition is generally a complex of an amine antioxidant and a hindered phenol antioxidant, or a complex of an amine (phenol) antioxidant and a hydroperoxide decomposer. For example: in an antioxidant additive composition reported in patent CN102206532B, when a bismuth compound and an arylamine compound are used together in a base oil with a certain composition, the initial oxidation temperature and the oxidation induction period of the base oil are both improved to a certain extent. Patent CN108026467A reports an antioxidant composition comprising methylenebis (di-n-butyldithiocarbamate), alkylated diphenylamine derivatives of triazoles. The antioxidant composition reported in patent CN104059717A comprises alkylated diphenylamine, phenothiazine and sulfurized hindered phenol, has less high-temperature thermal volatilization loss, can obviously improve the oxidation stability of lubricating oil under high-temperature conditions and metal ion catalysis conditions, and effectively prolongs the service life of the lubricating oil. Patent CN106604980A reports that a liquid ashless antioxidant additive for lubricating compositions whose composition includes an alkylated-phenyl-alpha-naphthylamine, an alkylated diphenylamine derivative of benzotriazole and methylenebis (di-n-butyldithiocarbamate) can significantly increase the oxidation induction time.

The tetraalkyl phosphonium phosphate ionic liquid has been proven to be an antiwear agent with excellent performance (anti wear performance and mechanism of oil-mixed ionic liquid as a lubricating additive. ACS Appl Mater Inter 2012), and the trihexyl tetradecyl phosphonium dioctyl phosphate, tetraoctyl phosphonium dioctyl phosphate ionic liquid reported in patent US2015/0232777A1 has lower abrasion in synthetic natural gas oil than ZDDP. Because the quaternary alkyl phosphonium phosphate ionic liquid has no antioxidant performance, the potential value of the quaternary alkyl phosphonium phosphate ionic liquid used as a composite antioxidant component is not found and is not reported.

Disclosure of Invention

The invention provides an antioxidant composition for lubricating oil, which is different from the antioxidant composition in the prior art, solves the technical problem of high-temperature oxidation of the lubricating oil in the prior art, has excellent antioxidant performance, prolongs the oxidation induction period of the lubricating oil, prolongs the service life of the lubricating oil, and achieves the purposes of saving energy and reducing consumption.

The invention is realized by the following steps: the lubricating oil antioxidant composition comprises an amine antioxidant and a tetraalkyl phosphonium phosphate ionic liquid.

As a preferred embodiment, the weight ratio of the amine antioxidant to the tetraalkyl phosphonium phosphate ionic liquid is 1: 100-100: 1.

as a preferred embodiment, the weight ratio of the amine antioxidant to the tetraalkyl phosphonium phosphate ionic liquid is 1: 10-10: 1.

in a preferred embodiment, the amine antioxidant is one of a linear or branched alkyl substituted diphenylamine or an alkylated phenyl-alpha-naphthylamine.

As a preferred embodiment, the linear or branched alkyl-substituted diphenylamine or alkylated phenyl- α -naphthylamine is one of butyl/octyl diphenylamine, dioctyl diphenylamine, N-phenyl- α -naphthylamine, octyl phenyl- α -naphthylamine, and polymers of dioctyl diphenylamine and octyl phenyl- α -naphthylamine.

As a preferred embodiment, the structural formula of the tetraalkyl phosphonium phosphate ionic liquid is shown as a formula (1),

wherein R1, R2, R3 and R4 are alkyl groups with 4-14 carbon atoms.

As a preferred embodiment, the tetraalkyl phosphonium phosphate ionic liquid is one of tributyl tetradecyl phosphonium dioctyl phosphate ionic liquid, trihexyl tetradecyl phosphonium dioctyl phosphate ionic liquid and tetraoctyl phosphonium dioctyl phosphate ionic liquid.

The invention has the beneficial effects that: the invention provides an antioxidant composition which is different from patents related in the background technology and solves the problem of high-temperature oxidation of lubricating oil. When the antioxidant composition is used in synthetic ester, the antioxidant performance of the antioxidant composition is higher than that of the antioxidant composition added with amine antioxidants alone, and the antioxidant composition especially obviously prolongs the oxidation induction life of lubricating oil.

The tetraalkyl phosphonium phosphate ionic liquid and the amine antioxidant have efficient synergistic antioxidant effect, when the tetraalkyl phosphonium phosphate ionic liquid and the amine antioxidant are used in combination, the induction period of the lubricating oil is obviously prolonged, the antioxidant performance which is difficult to achieve by independently adding the amine antioxidant is achieved, and the service life of the lubricating oil is prolonged. The lubricating oil can meet the lubricating working conditions with harsh requirements on high-temperature oxidation resistance, such as high-temperature chain transmission oil, aircraft engine oil, high-temperature lubricating grease and the like, and has wide application prospect.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.