阅读说明：本技术 一种聚脲稠化剂及其所得的润滑脂和润滑脂的制备方法 (Polyurea thickening agent, lubricating grease prepared from polyurea thickening agent and preparation method of lubricating grease ) 是由 王晓波 徐状 王卓群 于 2020-07-16 设计创作，主要内容包括：本发明提供一种聚脲稠化剂及其所得的润滑脂和润滑脂的制备方法,涉及润滑材料技术领域。该聚脲基润滑脂包括如下重量百分比的组分：基础油69.2～89.8％,聚脲稠化剂10～25％,抗氧剂0-5％,防锈剂0.2～0.8％,所述聚脲稠化剂采用二苯基甲烷-4,4’-二异氰酸酯和2-氨基-6-甲氧基苯并噻唑或混合胺合成,所述混合胺为2-氨基-6-甲氧基苯并噻唑和结构式为R-NH<Sub>2</Sub>的混合物,其中,R为碳原子数为8-22的烷基或环烷基。本发明制备的聚脲润滑脂采用新型具有极压性能的聚脲稠化剂,与现有的聚脲润滑脂技术相比,不用添加极压剂,且具有良好的极压性能,减少添加剂的种类和用量,能够广泛应用于轴承润滑领域。(The invention provides a polyurea thickening agent, lubricating grease obtained by the polyurea thickening agent and a preparation method of the lubricating grease, and relates to the technical field of lubricating materials. The polyurea-based lubricating grease comprises the following components in percentage by weight: 69.2-89.8% of base oil, 10-25% of polyurea thickening agent, 0-5% of antioxidant and 0.2-0.8% of antirust agent, wherein the polyurea thickening agent is synthesized by adopting diphenylmethane-4, 4' -diisocyanate and 2-amino-6-methoxybenzothiazole or mixed amine, the mixed amine is 2-amino-6-methoxybenzothiazole and the structural formula is R-NH 2 Wherein R isAn alkyl group or a cycloalkyl group having 8 to 22 carbon atoms. The polyurea lubricating grease prepared by the invention adopts a novel polyurea thickening agent with extreme pressure performance, compared with the prior polyurea lubricating grease technology, the polyurea lubricating grease does not need to be added with an extreme pressure agent, has good extreme pressure performance, reduces the types and the dosage of additives, and can be widely applied to the field of bearing lubrication.)

1. The polyurea thickening agent is characterized in that the polyurea thickening agent is synthesized by diphenylmethane-4, 4' -diisocyanate and 2-amino-6-methoxybenzothiazole or mixed amine, wherein the mixed amine is 2-amino-6-methoxybenzothiazole and has a structural formula of R-NH₂Wherein R is an alkyl group or a cycloalkyl group having 8 to 22 carbon atoms.

2. The polyurea thickener of claim 1, wherein the polyurea thickener is of formula i, or a mixture of formulae i, ii, and iii.

3. Polyurea grease containing the polyurea thickener of claim 1, comprising the following components in weight percent: 69.2-89.8% of base oil, 10-25% of polyurea thickening agent, 0-5% of antioxidant and 0.2-0.8% of antirust agent.

4. The polyurea grease of claim 3, wherein the base oil is synthetic ester base oil or mixed oil, the mixed oil is a mixture of synthetic ester base oil and one or more of mineral oil, poly α olefin, alkyl naphthalene and vegetable oil, and the base oil has a kinematic viscosity of 20-500 mm at 40 ℃²/s。

5. The polyurea grease of claim 3, wherein the antioxidant is added in an amount of 1 to 2.5%.

6. The polyurea grease of claim 5, wherein the antioxidant is one or more of alkyl diphenylamine, N-phenyl alpha-naphthylamine, and dioctyl diphenylamine.

7. The polyurea grease according to claim 3, wherein the rust inhibitor is added in an amount of 0.3 to 0.6%.

8. The polyurea grease of claim 7, wherein the rust inhibitor is one or more of barium petroleum sulfonate, sodium petroleum sulfonate, barium dinonylnaphthalene sulfonate, zinc naphthenate, fatty acid amine, and benzotriazole.

9. The process for the preparation of polyurea grease according to any one of claims 3 to 8, comprising the steps of:

(1) adding part of base oil and 2-amino-6-methoxybenzothiazole or mixed amine into a reaction kettle, heating to 95-105 ℃, stirring for 30min, adding part of base oil and diphenylmethane-4, 4' -diisocyanate into a dissolving kettle, heating to 80 ℃, stirring for 30min, adding a mixture in the dissolving kettle into the reaction kettle, heating to 80-140 ℃, and reacting for 30-120 min;

(2) heating to 160-220 ℃, refining for 20-120 min, cooling to 70 ℃, adding the rest base oil, the antioxidant and the antirust agent, homogenizing, filtering and degassing to obtain the finished product.

10. The preparation method according to claim 9, wherein the reaction temperature in the step (1) is 85-135 ℃, and the reaction time is 40-90 min; the refining temperature in the step (2) is 170-210 ℃, and the refining time is 30-100 min.

Technical Field

The invention relates to the technical field of bearing lubricating materials, in particular to a carbamido thickening agent with extreme pressure performance, lubricating grease containing the polyurea thickening agent and a preparation method thereof.

Background

The polyurea lubricating grease does not contain metal cations in the thickener system, avoids the catalytic oxidation effect on the base oil and the thickener system, has excellent oxidation resistance, is applied to high-temperature lubricating working conditions such as aviation, metallurgy and automobiles, and is considered to be the lubricating grease with the most development potential in the future. However, polyurea grease has poor lubricating properties and poor adaptability to lubricating additives, which greatly limits its wider application.

At present, there are two methods for improving the lubricating performance of polyurea grease, namely, a method for adding an additive with lubricating performance and a method for preparing composite polyurea grease. The addition of lubricating additives is the most common method, the lubricating performance is improved by adding extreme pressure agent or solid additive containing S, P element, the extreme pressure performance of polyurea grease is improved by adding zinc dialkyl dithiophosphate, sulfurized olefin, tungsten disulfide and other additives in patent CN 106147941a and CN 103289787a, but research on a large number of additive types and compounding schemes is required to obtain better extreme pressure performance. The extreme pressure performance of the composite polyurea lubricating grease can also be improved by preparing the composite polyurea lubricating grease, and the patent US3846315(A) provides a method for preparing the composite polyurea lubricating grease by introducing an alkali metal carboxylic acid compound into the polyurea lubricating grease, so that the extreme pressure performance of the polyurea lubricating grease is improved, but the preparation process is complex.

Disclosure of Invention

The invention provides a polyurea thickening agent with a simple preparation process, lubricating grease containing the polyurea thickening agent and a preparation method of the lubricating grease, and solves the technical problems that the process for improving the lubricating performance of the polyurea lubricating grease is complex, and a large number of additive types and compounding method researches are required in the prior art.

The invention is realized by the following steps:

the polyurea thickening agent is synthesized by diphenylmethane-4, 4' -diisocyanate and 2-amino-6-methoxybenzothiazole or mixed amine, wherein the mixed amine is 2-amino-6-methoxybenzothiazole and has a structural formula of R-NH₂Wherein R is an alkyl group or a cycloalkyl group having 8 to 22 carbon atoms.

As a preferred embodiment, the polyurea thickener has the formula I, or a mixture of the formulae I, II and III, as shown below.

The polyurea lubricating grease containing the polyurea thickening agent comprises the following components in percentage by weight: base of

69.2-89.8% of base oil, 10-25% of polyurea thickening agent, 0-5% of antioxidant and 0.2-0.8% of antirust agent.

As a preferred embodiment, the synthetic ester base oil or the mixed oil is the synthetic ester base oil mixed with one or more of mineral oil, poly α olefin, alkyl naphthalene and vegetable oil, and the kinematic viscosity of the base oil at 40 ℃ is 20-500 mm²/s。

In a preferred embodiment, the addition amount of the antioxidant is 1-2.5%.

As a preferred embodiment, the antioxidant is one or more of alkyl diphenylamine, N-phenyl alpha-naphthylamine and dioctyl diphenylamine.

In a preferred embodiment, the addition amount of the rust inhibitor is 0.3 to 0.6%.

As a preferable embodiment, the antirust agent is one or more of barium petroleum sulfonate, sodium petroleum sulfonate, barium dinonyl naphthalene sulfonate, zinc naphthenate, fatty acid amine and benzotriazole.

The preparation method of the polyurea lubricating grease comprises the following steps:

1) adding part of base oil and 2-amino-6-methoxybenzothiazole or mixed amine into a reaction kettle, heating to 95-105 ℃, stirring for 30min, adding part of base oil and diphenylmethane-4, 4' -diisocyanate into a dissolving kettle, heating to 80 ℃, stirring for 30min, adding a mixture in the dissolving kettle into the reaction kettle, heating to 80-140 ℃, and reacting for 30-120 min;

(2) heating to 160-220 ℃, refining for 20-120 min, cooling to 70 ℃, adding the rest base oil, the antioxidant and the antirust agent, homogenizing, filtering and degassing to obtain the finished product.

As a preferred embodiment, the reaction temperature in the step (1) is 85-135 ℃, and the reaction time is 40-90 min; the refining temperature in the step (2) is 170-210 ℃, and the refining time is 30-100 min.

The invention has the beneficial effects that: the polyurea lubricating grease is prepared by adopting the polyurea thickening agent with extreme pressure performance, the prepared polyurea lubricating grease does not need to be added with an extreme pressure agent, has good extreme pressure performance, reduces the types and the use amount of polyurea lubricating grease additives, and has simple preparation process.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood 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.