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CN-121975564-A - Conductive grease for in-situ generation of carbon film and preparation method thereof

CN121975564ACN 121975564 ACN121975564 ACN 121975564ACN-121975564-A

Abstract

The invention relates to the technical field of lubricants, in particular to conductive grease for generating a carbon film in situ and a preparation method thereof, wherein the conductive grease for generating the carbon film in situ is formed by mixing base oil, a thickening agent, organic acid and a conductive additive, and the molecular structure of the organic acid comprises a metastable cyclopropane ring and a surface active carboxyl group. The organic acid is easy to disperse in the base oil, and the carbon-based friction film is formed by friction catalytic reaction on the surface of the friction pair, so that the carbon-based friction film has the characteristics of low friction coefficient and low abrasion under the current-carrying condition, and has better performances of resisting load change, current change and frequency change. The preparation method disclosed by the invention is simple in process, green and pollution-free, and easy to realize industrial application.

Inventors

  • WANG DAOAI
  • FENG YANGE
  • WEI PENG
  • ZHOU FENG
  • LIU WEIMIN

Assignees

  • 中国科学院兰州化学物理研究所

Dates

Publication Date
20260505
Application Date
20260128

Claims (9)

  1. 1. The conductive grease is characterized by being formed by mixing base oil, a thickening agent, an organic acid and a conductive additive, wherein the molecular structure of the organic acid comprises a metastable cyclopropane ring and a surface active carboxyl group.
  2. 2. A conductive grease for in-situ carbon film generation as claimed in claim 1 wherein said base oil is one or more of polyalphaolefins, liquid paraffins, alkylated aromatics and perfluoropolyethers.
  3. 3. The conductive grease of claim 1, wherein the organic acid is one or more of cyclopropanecarboxylic acid, cyclopropane-1, 2-dicarboxylic acid, cyclopropaneacetic acid and 4-cyclopropylbutyric acid, and the conductive additive is one or more of carbon-based material, nano-metal particles, ionic liquid and liquid metal.
  4. 4. The conductive grease of claim 1, wherein the thickener is one or more of a lithium-based thickener, a polyurea thickener, an amide, and a calcium-based thickener.
  5. 5. The conductive grease for in-situ carbon film generation according to claim 1, wherein the mass content of the organic acid in the conductive grease is 0.5-5%, and the mass content of the conductive additive is 0.1-1%.
  6. 6. The conductive grease for in-situ carbon film generation as claimed in claim 1, wherein the mass ratio of the base oil to the thickener in the conductive grease is 9:1-7:3.
  7. 7. The conductive grease for in-situ carbon film generation as claimed in claim 5, wherein the mass content of the organic acid in the conductive grease is 2%.
  8. 8. The conductive grease of claim 6, wherein the mass ratio of base oil to thickener in the conductive grease is 8:2.
  9. 9. The method for preparing the conductive grease for in-situ generation of the carbon film according to claim 1, comprising the following steps: (1) Adding 0.5-5 parts by weight of organic acid and 80-90 parts by weight of base oil into a beaker, and stirring the mixed solution at room temperature for 30min until the mixed solution is fully mixed; (2) And adding 10-20 parts by weight of thickening agent into the mixed solution, heating to 150 ℃, sufficiently stirring, cooling to room temperature, adding 0.1-1 parts by weight of conductive additive, and homogenizing the obtained product by using a three-roller grinder to obtain the conductive grease.

Description

Conductive grease for in-situ generation of carbon film and preparation method thereof Technical Field The invention relates to the technical field of lubricants, in particular to conductive grease for generating a carbon film in situ and a preparation method thereof. Background With the rapid development of modern industry, especially in the fields of high and new technologies such as electronic information, precision instruments, aerospace, new energy automobiles and the like, the requirements on mechanical parts have evolved from single functions to multifunctional integration. A large number of key components, such as robot knuckle bearings, precision sliding electrical contacts, conductive slip rings, flexible circuit connectors, battery module connecting terminals of electric vehicles, and the like, are required to maintain extremely low friction coefficients and long-term stable lubrication states in continuous motion, and must ensure constant and reliable low-resistance electrical connection. Conventional insulating grease can prevent current transmission, but pure conductive materials (such as un-lubricated metal contacts) cannot solve the problems of fretting wear, arc corrosion, contact resistance surge caused by oxide film accumulation, signal interruption and the like. Conductive grease is essentially a special grease developed by introducing conductive functional filler into a traditional grease base system. The technical core is to solve the synergic problem between the construction of the conductive network and the maintenance of the lubricating property. The current technology path mainly surrounds the selection, modification and stable dispersion development of conductive fillers in grease systems. The existing conductive grease has the following technical problems that the existing conductive grease is complex in preparation method, poor in antifriction and antiwear performance, high in synthesis cost of additives, base oil and thickening agents doped in the conductive grease, easy to corrode metal friction pairs and environment-friendly. Disclosure of Invention Aiming at the content of the prior art, the invention provides conductive grease for generating a carbon film in situ and a preparation method thereof, and the primary aim of the invention is to solve the technical problems that the current conductive grease is complex in preparation method, poor in antifriction and antiwear performance, high in synthesis cost of additives, base oil and thickening agent doped in the conductive grease, easy to corrode a metal friction pair and environment-friendly. In order to achieve the above purpose, the technical scheme of the invention is as follows: The conductive grease is formed by mixing base oil, a thickening agent, organic acid and a conductive additive, wherein the molecular structure of the organic acid comprises a metastable cyclopropane ring and a surface active carboxyl group. Preferably, the base oil is one or more of polyalphaolefins, liquid paraffin, alkylated aromatics and perfluoropolyethers. Preferably, the organic acid is one or more of cyclopropanecarboxylic acid, cyclopropane-1, 2-dicarboxylic acid, cyclopropaneacetic acid and 4-cyclopropylbutyric acid. Preferably, the thickener is one or more of a lithium-based thickener, a polyurea thickener, an amide substance and a calcium-based thickener. Preferably, in the conductive grease, the mass content of the organic acid is 0.5-5%. Preferably, in the conductive grease, the mass ratio of the base oil to the thickener is 9:1-7:3. Preferably, in the conductive grease, the mass content of the conductive additive is 0.1-1%. Preferably, the conductive additive is one or more of carbon-based materials, nano-metal particles, ionic liquids and liquid metals. A preparation method of conductive grease for generating carbon film in situ comprises the following steps: (1) Adding 0.5-5 parts by weight of organic acid and 80-90 parts by weight of base oil into a beaker, and stirring the mixed solution at room temperature for 30min until the mixed solution is fully mixed; (2) And adding 10-20 parts by weight of thickening agent into the mixed solution, heating to 150 ℃, fully stirring, cooling to room temperature, adding 0.1-1 parts by weight of conductive additive, and homogenizing the obtained product by using a three-roller grinder to obtain the conductive grease. The conductive grease for generating the carbon film in situ and the preparation method thereof have the beneficial effects that: the organic acid is easy to disperse in the base oil, and the carbon-based friction film is formed by friction catalytic reaction on the surface of the friction pair, so that the carbon-based friction film has the characteristics of low friction coefficient and low abrasion under the current-carrying condition, and has better performances of resisting load change, current change and frequency change. The preparation method disclosed by the invention is