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CN-122012166-A - Efficient wear-resistant lubricating grease composition for heavy load working conditions and preparation method thereof

CN122012166ACN 122012166 ACN122012166 ACN 122012166ACN-122012166-A

Abstract

The invention discloses a high-efficiency wear-resistant lubricating grease composition for heavy load working conditions and a preparation method thereof, wherein the high-efficiency wear-resistant lubricating grease composition comprises, by weight, 0.5-1.5 parts of MoS 2 GF composite material, 15-25 parts of extreme pressure antiwear agent, 0.05-1 part of metal deactivator, 1-3 parts of antioxidant, 10-15 parts of composite lithium thickener, 5-15 parts of mineral oil and the balance of synthetic oil. The lubricating grease is not only suitable for transmission parts such as heavy-duty bearings, gears and the like with high load and high impact, but also can be used for severe working conditions such as high temperature, high speed and the like, and has good engineering applicability and reliability.

Inventors

  • DAI YUANJING
  • YAN JIAYUAN
  • ZHANG JIPING
  • ZHANG CHENHUI
  • LUO JIANBIN

Assignees

  • 清华大学天津高端装备研究院
  • 清华大学

Dates

Publication Date
20260512
Application Date
20260311

Claims (9)

  1. 1. The efficient wear-resistant lubricating grease composition for heavy load working conditions is characterized by comprising the following components in parts by weight: 0.5-1.5 parts of MoS 2 GF composite material; 15-25 parts of extreme pressure antiwear agent; 0.01-0.05 part of metal deactivator; 1-3 parts of an antioxidant; 10-15 parts of composite lithium thickener; 5-15 parts of mineral oil; the balance of synthetic oil.
  2. 2. The efficient wear-resistant lubricating grease composition for heavy load working conditions, as claimed in claim 1, is characterized in that the preparation method of the MoS 2 GF composite material comprises the following steps: S1, pretreating glass fibers, and modifying the surfaces of the glass fibers to obtain pretreated glass fibers; S2, dissolving a molybdenum source and a sulfur source in deionized water, adding polyethylene glycol, and uniformly stirring to obtain a precursor solution; and S3, adding the glass fiber pretreated in the step S1 into the precursor solution prepared in the step S2, uniformly dispersing, transferring into a high-pressure reaction kettle, performing solvothermal reaction, and performing post-treatment to obtain the MoS 2 GF composite material.
  3. 3. The efficient antiwear grease composition for heavy load operation according to claim 1, wherein the pretreatment of glass fiber in step S1 comprises the steps of placing glass fiber in a solution prepared by mixing absolute ethanol and acetone, ultrasonic cleaning, repeated washing with deionized water, and drying at 80 ℃, wherein the volume ratio of absolute ethanol to acetone is preferably 1:0.5-1.5; The glass fiber modification in the step S1 comprises immersing the pretreated glass fiber in an alkaline solution, etching for 20-28h at room temperature, fully washing with deionized water to neutrality after the reaction, and drying to obtain the pretreated glass fiber.
  4. 4. The high-efficiency wear-resistant lubricating grease composition for heavy load working conditions, as set forth in claim 1, wherein the molybdenum source in the step S2 is ammonium molybdate tetrahydrate; And/or the sulfur source in the step S2 is thiourea; And/or stirring speed in the step S2 is 400-600rpm, and stirring time is 8-12min.
  5. 5. The high-efficiency wear-resistant lubricating grease composition for heavy load working conditions, as claimed in claim 1, wherein the solvothermal reaction temperature in the step S3 is 170-190 ℃, and the reaction time is kept at a constant temperature of 14-16 h; The post-treatment in the step S3 comprises washing for several times, and the obtained solid product is dried in vacuum at 70-90 ℃ to obtain the MoS 2 GF composite material.
  6. 6. The high-efficiency antiwear lubricating grease composition for heavy load working conditions according to claim 1, wherein the extreme pressure antiwear agent is one or more selected from triphenyl thiophosphate, tricresyl phosphate, aminothioformate, amine thiophosphate salt and sulfurized isobutylene.
  7. 7. The high-efficiency wear-resistant lubricating grease composition for heavy load working conditions according to claim 1, wherein the metal deactivator is one or two selected from N, N-di-N-butylaminomethylene benzotriazole and benzotriazole derivatives.
  8. 8. The efficient wear-resistant lubricating grease composition for heavy load working conditions, as claimed in claim 1, wherein the antioxidant is one or two selected from 2, 6-di-tert-butyl-p-methylphenol and octyl/butyl diphenylamine.
  9. 9. The efficient wear-resistant lubricating grease composition for heavy load working conditions, as claimed in claim 1, is characterized in that the composite lithium-based grease thickener is prepared by performing saponification reaction on lithium hydroxide, dodecahydroxystearic acid and sebacic acid for 3h at 90-110 ℃, refining for 5-10 minutes at a high temperature of 215-220 ℃, cooling to 180-190 ℃ in a very short time from 215-220 ℃, and grinding for 3-5 times after finally naturally cooling to room temperature.

Description

Efficient wear-resistant lubricating grease composition for heavy load working conditions and preparation method thereof Technical Field The invention belongs to the technical field of lubricating grease, and particularly relates to a high-efficiency wear-resistant lubricating grease composition for heavy-duty working conditions and a preparation method thereof. Background Under the heavy load working condition, the friction pair in the mechanical equipment bears extremely high contact stress and impact load, and has higher requirements on the abrasion resistance, extreme pressure property and mechanical stability of the lubricating grease. Conventional lubricating grease often has problems of insufficient oil film strength, uneven dispersion of solid additives and the like, and is difficult to maintain stable lubricating effect under extreme conditions. Therefore, development of the lubricating grease with the high-strength lubricating film, excellent wear resistance and good high-temperature stability has important engineering application value. Disclosure of Invention In view of the above, the present invention aims to provide a high-efficiency antiwear grease composition for heavy load working conditions and a preparation method thereof, so as to solve at least one technical problem in the background art. In order to achieve the above purpose, the technical scheme of the invention is realized as follows: The efficient antiwear lubricating grease composition for heavy load working condition includes MoS 2 GF composite material in 0.5-1.5 weight portions; 15-25 parts of extreme pressure antiwear agent; 0.05-1 part of metal deactivator; 1-3 parts of an antioxidant; 10-15 parts of composite lithium thickener; 5-15 parts of mineral oil; the balance of synthetic oil. Further, the preparation method of the MoS 2 GF composite material comprises the following steps: S1, pretreating glass fibers, and modifying the surfaces of the glass fibers to obtain pretreated glass fibers; S2, dissolving a molybdenum source and a sulfur source in deionized water, adding polyethylene glycol, and uniformly stirring to obtain a precursor solution; and S3, adding the glass fiber pretreated in the step S1 into the precursor solution prepared in the step S2, uniformly dispersing, transferring into a high-pressure reaction kettle, performing solvothermal reaction, and performing post-treatment to obtain the MoS 2 GF composite material. The self-made additive (MoS 2 GF) is formed by compounding nanoscale flower-ball-shaped molybdenum disulfide clusters with glass fibers by a special process (MoS 2 -GF). The composite material has excellent synergistic effect under severe friction conditions of heavy load and extreme pressure, and is characterized in that the lubricating grease can form a layer of high-strength solid lubricating film with a repairing function on the surface of a friction pair. The film is formed and acted by a dynamic and staged process, wherein firstly, under the initial contact or medium-high load, rod-shaped glass fibers can effectively disperse contact stress and provide rigid support, meanwhile, flower-ball-shaped molybdenum disulfide is used as an auxiliary supporting point to jointly improve oil film strength and extreme pressure bearing capacity, then, when the load is rapidly increased to a critical state, controllable micro-crushing can be carried out on the glass fibers, the generated micro-nano particles can accurately fill microscopic cracks and defects generated on the metal surface due to stress concentration to play a role in repairing and flattening the surface, meanwhile, flower-ball-shaped molybdenum disulfide clusters are crushed and spread to form a plurality of layers of easily sheared MoS 2 disulfide sheets, and the sheets are covered on a friction interface, so that the easily sheared effect is achieved in the sliding friction process, and finally, the great reduction of friction coefficient and the quality change of wear resistance are realized. In addition, the composite filler has little influence on other properties of the composite lithium-based grease, and the grease still has excellent high temperature resistance, colloid stability and the like. Further, the pretreatment of the glass fiber in the step S1 comprises the steps of placing the glass fiber in a solution mixed by absolute ethyl alcohol and acetone, ultrasonically cleaning, then repeatedly washing with deionized water, and drying at 80 ℃, wherein the volume ratio of the absolute ethyl alcohol to the acetone is preferably 1:0.5-1.5; The glass fiber modification in the step S1 comprises immersing the pretreated glass fiber in an alkaline solution, etching for 20-28h at room temperature, fully washing with deionized water to neutrality after the reaction, and drying to obtain the pretreated glass fiber. Further, the molybdenum source in step S2 is ammonium molybdate tetrahydrate; And/or the sulfur source in the step S2 is thiourea;