CN-122012156-A - Lubricating grease applied to automobile transmission device and preparation method thereof

CN122012156ACN 122012156 ACN122012156 ACN 122012156ACN-122012156-A

Abstract

The invention provides a long-period low-carbon running lubricating grease and a preparation method and application thereof, wherein the lubricating grease comprises specific parts of base oil, a thickening agent and an additive, the additive comprises specific parts of an antioxidant, an antirust agent, a copper corrosion inhibitor and an extreme pressure antiwear agent, the thickening agent is selected and matched specifically, the obtained lubricating grease has excellent shearing resistance, the additive is fully fed between ball cage friction pairs through the specific selection and matching of the additive, the problem of abnormal sound with a large swing angle is effectively solved, the excellent extreme pressure antiwear performance is shown, and the lubricating grease has good compatibility with TPE (thermoplastic elastomer) while the high and low temperature resistance is considered through the specific selection and matching of the base oil.

Inventors

ZHANG JUAN
CHEN BIAO
ZHENG HONG
CHEN TIANJIN
MA RUI
SHEN YI

Assignees

杭州得润宝科技股份有限公司

Dates

Publication Date: 20260512
Application Date: 20260129

Claims (10)

1. The lubricating grease is characterized by comprising, by weight, 70-90 parts of base oil, 4-20 parts of thickener and 2-20 parts of additive; the additive comprises, by weight, 0.1-5 parts of an antioxidant, 0.1-3 parts of an antirust agent, 1-2 parts of a copper corrosion inhibitor and 0.5-10 parts of an extreme pressure antiwear agent.
2. Grease according to claim 1, wherein the base oil comprises polyethers, esters and/or synthetic hydrocarbon oils; preferably, the ester oil comprises any one or at least two of a diester, a complex ester, and a polyol ester; preferably, the mass ratio of the ester oil to the synthetic hydrocarbon oil is (0.1-2.0): 1.
3. Grease according to claim 1 or 2, wherein the thickener comprises a combination of an isocyanate and a polybasic organic amine; preferably, the mass ratio of the isocyanate to the polybasic organic amine is (0.2-4): 1; preferably, the isocyanate comprises diphenylmethane diisocyanate and/or polyphenyl polymethylene polyisocyanate; Preferably, the polybasic organic amine comprises any one or a combination of at least two of oleyl primary amine, cyclohexyl amine, tetradecyl primary amine and decyl diamine.
4. A grease according to any one of claims 1 to 3, wherein the additive comprises 0.5 to 10 parts by weight of an extreme pressure antiwear agent; Preferably, the extreme pressure antiwear agent comprises any one or a combination of at least two of molybdenum dialkyl dithiocarbamate, borate, sulfurized olefin, di-n-butyl phosphite, light calcium carbonate, calcium pyrophosphate, topologically modified nanocarbon, thiadiazole dimer, and ammonium phosphate salt.
5. The grease of any of claims 1-4, wherein the additive further comprises 0.5-3 parts by weight of a rust inhibitor; Preferably, the rust inhibitor comprises any one or a combination of at least two of nonenylsuccinic anhydride, heptadecenyl hydroxyethyl imidazoline, N-oleoyl sarcosine, dodecenyl succinic acid half ester, calcium sulfonate, or basic barium dinonylnaphthalene sulfonate.
6. The grease of any one of claims 1-5, wherein the additive further comprises 0.5-5 parts by weight of an antioxidant; preferably, the antioxidants include phosphite, amine and/or phenolic antioxidants.
7. The grease of any of claims 1-5, wherein the additive further comprises 1-2 parts by weight of a copper corrosion inhibitor; preferably, the copper corrosion inhibitor comprises a thiadiazole derivative and/or a benzotriazole derivative.
8. A method for preparing a grease according to any one of claims 1 to 7, comprising reacting a thickener with a base oil, and adding an additive to mix to obtain the grease.
9. The preparation method according to claim 8, characterized in that it comprises the following steps: (1) Dissolving and mixing isocyanate and polybasic organic amine to obtain a thickener A; (2) Mixing the thickening agent A with part of base oil, and heating, refining and preserving heat to obtain a mixture B; (3) Adding the rest part of base oil, an antioxidant, an optional extreme pressure antiwear agent, a copper corrosion inhibitor, an optional oxidant and an optional antirust agent into the mixture B obtained in the step (2) to mix, so as to obtain the lubricating grease.
10. The method of claim 9, wherein the temperature of the mixing in step (1) is 30-50 ℃; Preferably, the mixing time of step (1) is from 90 to 160 min; preferably, the temperature of the mixing of step (2) is 120-160 ℃; Preferably, the temperature rising rate of the temperature rising refining in the step (2) is 1-5 ℃ per minute; Preferably, the time of the heat preservation in the step (2) is 10-30 min; preferably, the temperature of the mixing of step (3) is 60-100 ℃; preferably, the mixing time of step (3) is 60-90 min; preferably, the step (3) further comprises a step of homogenizing after the mixing is finished.

Description

Lubricating grease applied to automobile transmission device and preparation method thereof Technical Field The invention belongs to the technical field of lubricating grease, and particularly relates to lubricating grease, a preparation method and application thereof, in particular to lubricating grease with good shearing performance and bearing capacity, and a preparation method and application thereof. Background The automotive transmission is the "hub" of the automotive power chain, and its lubrication is a complex field involving tribology, materials science, chemistry and mechanical engineering. The lubricant is here not only a "grease" reducing friction, but also a functional working fluid guaranteeing gear shift quality, transmission efficiency, component life and overall vehicle reliability. The device transmits the power generated by the engine to the driving wheels in a controllable manner and adapts to the system general name of the driving requirement. The key tasks are that the speed and the torque are reduced, the speed is changed, the differential speed is allowed, and the smooth engagement and the interruption of the power are ensured. The need for grease for automotive transmissions has been upgraded from simple "rust prevention, lubrication" to a high performance, multi-functional, custom-made "key engineering material". Proper grease selection is critical to ensure reliability, durability, safety (e.g., steering), silence, and energy efficiency of the vehicle. The grease is required to have excellent oxidation stability, mechanical stability and colloid stability, and the performance decay is extremely small in the life cycle. The structure and performance of the grease must remain stable over a wide operating temperature range from extremely cold start-up to the high temperatures generated by hot-up/braking. Material compatibility, must be compatible with the variety of rubber/plastic seals, coatings, alloys in contact, and not cause aging, corrosion or swelling. Extreme pressure antiwear properties, for high load sites, protection against wear and pitting, solid lubricants, for extreme pressure or emergency lubrication (e.g., molybdenum disulfide, graphite). Rust and corrosion inhibitor for resisting salt fog and rain. And an antioxidant ensures high temperature and long service life. The friction coefficient of grease needs to be stabilized in a specific range at a position where friction force needs to be controlled with accurate friction characteristics. CN201510677287.6 discloses a grease special for constant velocity universal joints of automobiles, which comprises the following raw materials of octadecylamine, cyclohexane, diphenylmethane-4.4' -diisocyanate, fatty acid, lithium hydroxide, water, base oil a, base oil B, antioxidant a, antioxidant B, extreme pressure antiwear agent a, extreme pressure antiwear agent B, extreme pressure antiwear agent C, oiliness agent, tackifier and antirust agent. The preparation method comprises the steps of stirring various raw materials according to different temperature and time parameters in a required sequence, reacting, and processing according to related process requirements. The lubricating grease disclosed by the invention has the advantages of excellent high-low temperature property, abrasion resistance, oxidation resistance, shear stability, good waterproof property, anti-corrosion and rust resistance, colloid stability and extreme pressure property, effectively reduces vibration, and has good compatibility with sealing materials and long service life. CN202311408676.X discloses a lubricating grease composition for a cross-shaft universal joint and a preparation method thereof. The lubricating grease composition comprises the following components of base oil, isocyanate, organic amine, antifriction agent, extreme pressure agent and rust inhibitor. The lubricating grease composition has excellent extreme pressure performance and durability, and simultaneously has excellent high temperature resistance, the service temperature can reach minus 30 to 180 ℃, and the lubricating requirement of the cross axle universal joint of the medium and heavy commercial vehicle can be met. However, the above solutions do not provide a good solution for solving the problem of large swing angle abnormal sound of the new energy vehicle and the environment friendliness of grease. Therefore, how to provide a grease for an automobile transmission, which can replace the existing products and further improve the effects, is a problem to be solved. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide lubricating grease, a preparation method and application thereof, wherein the lubricating grease has excellent high-low temperature performance, simultaneously meets the requirements of long-period low-carbon environment protection, and the novel polyurea thickener system has excellent shearing resistance, prevents oil sludge