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CN-122012158-A - High-temperature-resistant lubricating grease and preparation method thereof

CN122012158ACN 122012158 ACN122012158 ACN 122012158ACN-122012158-A

Abstract

The invention relates to high temperature resistant grease and a preparation method thereof, which belong to the technical field of grease, wherein cyanuric chloride is reacted with 4-amino-2, 6-di-tert-butylphenol to generate an antioxidant auxiliary agent, the antioxidant auxiliary agent is reacted with sodium hydrosulfide to obtain a vulcanized antioxidant auxiliary agent, the vulcanized antioxidant auxiliary agent is reacted with N-chlorosuccinimide under the protection of nitrogen, and then reacted with diethyl phosphite to obtain a multifunctional modified auxiliary agent, and finally the multifunctional modified auxiliary agent is blended with base oil and a thickening agent to obtain the high temperature resistant grease.

Inventors

  • LAN BINGLI
  • TANG ZIBIN
  • FANG BAISONG

Assignees

  • 深圳市合诚润滑材料有限公司
  • 中山市合诚新材料科技有限公司

Dates

Publication Date
20260512
Application Date
20260204

Claims (10)

  1. 1. The preparation method of the high-temperature-resistant lubricating grease is characterized by comprising the following steps of: Uniformly mixing the multifunctional modified auxiliary agent, the base oil and the thickening agent, reacting for 30-60min at 90-150 ℃, and cooling to obtain high-temperature-resistant lubricating grease; the preparation method of the multifunctional auxiliary agent comprises the following steps: S1, carrying out nucleophilic substitution reaction on cyanuric chloride and 4-amino-2, 6-di-tert-butylphenol to obtain an antioxidation auxiliary agent; S2, nucleophilic substitution reaction is carried out on the antioxidant auxiliary agent and sodium hydrosulfide to obtain a vulcanized antioxidant auxiliary agent; S3, reacting the vulcanization antioxidant auxiliary with N-chlorosuccinimide and then performing coupling reaction with diethyl phosphite to obtain the multifunctional modified auxiliary.
  2. 2. The preparation method of the high-temperature-resistant lubricating grease according to claim 1, wherein the mass ratio of the multifunctional modified auxiliary agent, the base oil and the thickening agent is 2-8:75-90:8-20.
  3. 3. The preparation method of the high-temperature-resistant lubricating grease according to claim 1, wherein in S1, the mass ratio of cyanuric chloride to 4-amino-2, 6-di-tert-butylphenol is 32-36:34-39.
  4. 4. The preparation method of the high-temperature-resistant lubricating grease according to claim 1, wherein in S2, the mass ratio of the antioxidant auxiliary agent to the sodium hydrosulfide is 20-25:6.1-7.6.
  5. 5. The method for preparing high-temperature-resistant lubricating grease according to claim 1, wherein the reaction temperature of S1 is 0-5 ℃ and the reaction time is 2-3h.
  6. 6. The method for preparing high-temperature-resistant lubricating grease according to claim 1, wherein the reaction temperature of S2 is 60-80 ℃ and the reaction time is 7-9h.
  7. 7. The preparation method of the high-temperature-resistant lubricating grease according to claim 1, wherein in S3, the mass ratio of N-chlorosuccinimide to vulcanized antioxidant auxiliary agent to diethyl phosphite is 4.5-7.4:6-10:4.6-7.6.
  8. 8. The method for preparing high temperature resistant grease according to claim 1, wherein the base oil is at least one of PAO100, PAO6, PAO 8.
  9. 9. The method for preparing high-temperature-resistant lubricating grease according to claim 1, wherein the thickener is a polyurea thickener.
  10. 10. A high temperature resistant grease prepared by the method of any one of claims 1-9.

Description

High-temperature-resistant lubricating grease and preparation method thereof Technical Field The invention belongs to the technical field of lubricating grease, and particularly relates to high-temperature-resistant lubricating grease and a preparation method thereof. Background With the development of modern industrial equipment towards high speed, heavy load, high temperature and long-period running, the modern industrial equipment has very strict requirements on the performance of lubricating grease used by key parts (such as bearings, gears and the like), many researches on self-repairing lubricating grease exist in the prior art, such as CN110257141B environment-friendly self-repairing lubricating grease and a preparation method thereof provide environment-friendly self-repairing lubricating grease, but the scheme does not solve the defect of heat stability of the lubricating grease. Although the traditional grease such as poly alpha-olefin (PAO) and other synthetic base oil has better thermal stability, the grease still gradually oxidizes under the catalysis of high temperature, oxygen and metal, so that the base oil molecules of the grease are subjected to polymerization and other reactions, the viscosity is increased, the fluidity of the grease is deteriorated, and an effective lubricating film is difficult to form between friction pairs, so that friction and abrasion are increased, the degradation of the base oil is accelerated, and the metal surface is corroded, therefore, the development of the grease with high thermal stability has great significance for improving the reliability and service life of the high-end equipment. Disclosure of Invention The invention aims to provide high-temperature-resistant lubricating grease and a preparation method thereof, which are used for solving the problems in the background art. The aim of the invention can be achieved by the following technical scheme: a preparation method of high-temperature-resistant lubricating grease comprises the following steps: And uniformly mixing the multifunctional modified auxiliary agent, the base oil and the thickening agent, reacting for 30-60min at 90-150 ℃, and cooling to obtain the high-temperature-resistant lubricating grease. The preparation method of the multifunctional modified auxiliary agent comprises the following steps: s1, adding cyanuric chloride into tetrahydrofuran, adding 4-amino-2, 6-di-tert-butylphenol and potassium carbonate into the tetrahydrofuran at 0-5 ℃, reacting for 2-3h, filtering to remove solids after the reaction is finished, and then removing a solvent by rotary evaporation to obtain the antioxidation auxiliary agent. S2, adding sodium hydrosulfide into ethanol, adding an antioxidant auxiliary agent, reacting for 7-9h at 60-80 ℃, cooling to room temperature after the reaction is finished, distilling under reduced pressure to remove ethanol, adding deionized water, extracting with dichloromethane, drying an organic phase, and removing dichloromethane by rotary evaporation to obtain the vulcanized antioxidant auxiliary agent. S3, adding N-chlorosuccinimide and a vulcanization antioxidant auxiliary agent into acetonitrile under the protection of nitrogen, reacting for 20-25min at room temperature, adding diethyl phosphite, reacting for 10-15min, precipitating the reaction solution with ethyl acetate after the reaction is finished, filtering to remove solids, and removing the solvent by rotary evaporation of the residual liquid to obtain the multifunctional modified auxiliary agent. Further, the base oil is at least one of PAO100, PAO6 and PAO 8. Further, the thickener is a polyurea thickener. Further, the mass ratio of the multifunctional modifying auxiliary agent, the base oil and the thickening agent is 2-8:75-90:8-20. Further, in S1, the mass ratio of cyanuric chloride to 4-amino-2, 6-di-tert-butylphenol is 32-36:34-39. Further, in S2, the mass ratio of the antioxidant auxiliary agent to the sodium hydrosulfide is 20-25:6.1-7.6. Further, in S3, the mass ratio of the N-chlorosuccinimide to the vulcanization antioxidant auxiliary to the diethyl phosphite is 4.5-7.4:6-10:4.6-7.6. The high-temperature-resistant lubricating grease is prepared by any preparation steps. The invention has the beneficial effects that: 1) The invention firstly carries out nucleophilic substitution reaction on cyanuric chloride and 4-amino-2, 6-di-tert-butylphenol to generate an antioxidant auxiliary agent, then carries out nucleophilic substitution reaction on the antioxidant auxiliary agent and sodium hydrosulfide to obtain a vulcanized antioxidant auxiliary agent, then carries out coupling reaction on the vulcanized antioxidant auxiliary agent and N-chlorosuccinimide under the protection of nitrogen, and then carries out coupling reaction on the vulcanized antioxidant auxiliary agent and diethyl phosphite to obtain a multifunctional modified auxiliary agent, and finally, blends the multifunctional modified auxiliary agent