Grease lubricant applied under high contact stress

Abstract

The invention belongs to the technical field of grease lubricants, and particularly relates to a grease lubricant applied under high contact stress, which is prepared by mixing and doping lubricating oil, a thickening agent and an additive according to a certain proportion. According to the prepared grease lubricant, the preparation method is simple and easy to operate, large-scale preparation can be achieved in a laboratory, and more importantly, the lubricating material has excellent antifriction and antiwear performance, and abrasion between multiple friction pairs is effectively reduced. Experiments prove that the lubricant has excellent anti-friction and anti-wear properties after being tested for a long time, and meanwhile, the grease lubricant in a semi-solid state solves the problem of flowing and creeping of lubricating oil.

Description

Technical Field

[0001] The present invention belongs to the technical field of grease lubricants, and particularly relates to a grease lubricant applied under high contact stress. Background Art

[0002] Friction and wear commonly existing in daily life and industrial processes result in huge energy consumption and economic losses. Metals, polymers, and ceramic materials are widely used in various friction moving parts, such as bearings, gears, sliding rails, chains, etc. Wear will inevitably occur under long-term friction and high contact stress, which will not only reduce the service life of mechanical equipment, increase maintenance costs, but also cause unnecessary energy loss. Therefore, it is crucial to develop and design lubricating materials that can achieve near-zero wear of metal, polymer, and ceramic friction pairs.

[0003] So far, according to different lubricating materials used, lubricants are divided into solid lubrication and liquid lubrication. However, most solid lubricants have problems such as complex preparation processes and harsh application environments. Although the application environment of liquid lubricants is wide, most of the currently used liquid lubricants have problems such as a longer running-in period and a more cumbersome preparation process. Even the currently applied industrial oils will inevitably have adhesive wear during the friction process. Especially for space devices, the fluidity of liquid lubricants will instead contaminate the devices, causing greater economic losses.

[0004] Although grease can solve the creepability of liquid lubricants, its lubricating performance will be affected by factors such as speed. The emergence of gel lubricants provides a new way for material wear. For example, it has been reported that by adding an octadecyl phosphate solution to the dispersion of Ti-3C-2T-x for dehydration condensation, a Ti-3C-2T-x@ODPA additive is obtained; then the obtained Ti-3C-2T-x@ODPA additive is added to the base oil, and after ultrasonic dispersion, a lubricating oil of the Ti-3C-2T-x@ODPA additive is obtained; finally, a gelling agent is added for heat treatment, and after cooling, a supramolecular gel lubricant is obtained. Although this gel lubricant has good lubricating performance, it has problems such as complex preparation processes and high costs, and is not suitable for mass production. Therefore, it is very important to design a lubricant that can withstand high loads, has a simple preparation process, and low costs. Summary of the Invention

[0005] The present invention discloses a grease lubricant applied under high contact stress. In the present invention, the oil and the additive are simply mixed, heated and stirred, and then left to stand and cool. During the cooling process, the additive will slowly wrap the oil, and finally form a semi-solid lubricant, thereby preventing the creepage and leakage of the lubricating oil, and enabling ultra-low wear of friction components under high contact stress.

[0006] To achieve the above object, the technical solution of the present invention is as follows:

[0007] A grease lubricant applied under high contact stress, wherein the grease lubricant is prepared by mixing and doping lubricating oil, thickening agent, and additive in a certain proportion.

[0008] Preferably, the lubricating oil refers to at least one of oleylamine, poly-α-olefin, liquid paraffin, 500SN, alkylated aromatic hydrocarbon, long-chain alkane, neopentyl glycol dioleate, monoricinolein, polyol ester oil, and mannitol oleate.

[0009] Preferably, the thickening agent refers to at least one of stearic acid amide, erucic acid amide, ferrous stearate, 12-hydroxy stearic acid, glycerol monostearate, hydroxycellulose, polyurethane, nicotinamide, ethylene bis-stearamide, ethylene lauric acid amide, and glycerol stearate citrate.

[0010] Preferably, the additive refers to at least one of tungstic acid, decanol, glycerol, azelaic acid, zinc sulfide, graphene, boron nitride, halloysite, fluorinated graphite, copper phthalocyanine, MODTC, and MODTP.

[0011] Preferably, the mass ratio of the thickening agent, lubricating oil, and additive is between 1:3:0.01 and 1:30:0.1.

[0012] A preparation method of a grease lubricant applied under high contact stress, comprising the following steps: According to the mass ratio of the thickening agent, lubricating oil, and additive, first add the thickening agent to the lubricating oil, heat and stir, and after it completely becomes a liquid, add the additive, and wait for the solution to cool to obtain the grease lubricant.

[0013] The beneficial effects of a grease lubricant applied under high contact stress of the present invention are as follows:

[0014] 1. The preparation process is simple, only requiring heating, stirring, and standing, without the need for extra operations. 2. It can be prepared in large quantities, and by expanding the raw material ratio, kilogram-level products can be prepared in the laboratory. 3. The material has excellent performance, with outstanding friction reduction and anti-wear effects. Under the same conditions, the friction coefficient of the same type of pure lubricating oil is reduced by 45%, and the wear rate is reduced by 98%. 4. It can slow down the wear caused by the creep and leakage of the lubricating oil. 5. The cost is low. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram of the grease lubricant and lubricating oil provided by the present invention, with the lubricating oil on the left and the synthesized grease lubricant on the right;

[0016] Figure 2The comparative curve graph showing the change of friction coefficient over time of the grease lubricant and the lubricating oil provided in Example 8 under a contact pressure of 1.15 GPa;

[0017] Figure 3 The curve graph showing the change of friction coefficient over time of the grease lubricant provided in Example 9 under a contact pressure greater than 2 GPa;

[0018] Figure 4 The wear rate graph of the steel block lubricated with the grease lubricant provided in Example 8.

[0019] Figure 5 The wear graph of the steel block lubricated with the grease lubricant provided in Example 9. Detailed implementation manners

[0020] The following description is only for the preferred embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0021] The following embodiments can be understood as separately expressing a part of the local structure or method of the present invention, or can also be understood as the embodiments combined with each other to explain the connotation of the structure or method of a larger scope of the present invention.

[0022] Example 1

[0023] A grease lubricant applied under high contact stress, and the grease lubricant is formed by mixing and doping lubricating oil, thickening agent, and additive in a certain proportion.

[0024] Example 2

[0025] This embodiment gives 10 specific implementation manners of the lubricating oil:

[0026] 2.1 The lubricating oil mentioned refers to oleylamine; 2.2 The lubricating oil mentioned refers to polyalphaolefin; 2.3 The lubricating oil mentioned refers to liquid paraffin; 2.4 The lubricating oil mentioned refers to 500SN; 2.5 The lubricating oil mentioned refers to alkylated aromatic hydrocarbon; 2.6 The lubricating oil mentioned refers to long-chain alkane; 2.7 The lubricating oil mentioned refers to neopentyl glycol dioleate; 2.8 The lubricating oil mentioned refers to glycerol monoricinoleate; 2.9 The lubricating oil mentioned refers to polyol ester oil; 2.10 The lubricating oil mentioned refers to mannitol oleate.

[0027] It can be understood that in other implementation manners of the present invention, multiple combinations of the above implementation manners 2.1 - 2.10 can also be selected to form the lubricating oil.

[0028] Example 3

[0029] This embodiment provides 11 specific embodiments of the thickening agent:

[0030] 3.1 The thickening agent mentioned refers to stearic acid amide; 3.2 The thickening agent mentioned refers to erucic acid amide; 3.3 The thickening agent mentioned refers to ferrous stearate; 3.4 The thickening agent mentioned refers to 12 - hydroxy stearic acid; 3.5 The thickening agent mentioned refers to glycerol monostearate; 3.6 The thickening agent mentioned refers to hydroxycellulose; 3.7 The thickening agent mentioned refers to polyurethane; 3.8 The thickening agent mentioned refers to nicotinamide; 3.9 The thickening agent mentioned refers to ethylene bis stearamide; 3.10 The thickening agent mentioned refers to ethylene lauric acid amide; 3.11 The thickening agent mentioned refers to glycerol stearate citrate.

[0031] It can be understood that in other embodiments of the present invention, multiple combinations of the above embodiments 3.1 - 3.11 can also be selected to form the thickening agent.

[0032] Example 4

[0033] This embodiment provides 12 specific embodiments of the additive:

[0034] 4.1 The additive mentioned refers to tungstic acid; 4.2 The additive mentioned refers to decanol; 4.3 The additive mentioned refers to glycerol; 4.4 The additive mentioned refers to azelaic acid; 4.5 The additive mentioned refers to zinc sulfide; 4.6 The additive mentioned refers to graphene; 4.7 The additive mentioned refers to boron nitride; 4.8 The additive mentioned refers to halloysite; 4.9 The additive mentioned refers to fluorinated graphite; 4.10 The additive mentioned refers to copper phthalocyanine; 4.11 The additive mentioned refers to MODTC; 4.12 The additive mentioned refers to MODTP.

[0035] It can be understood that in other embodiments of the present invention, multiple combinations of the above embodiments 4.1 - 4.12 can also be selected to form the additive.

[0036] Example 5

[0037] The mass ratio of the thickening agent, lubricating oil and additive is 1:3:0.01.

[0038] Example 6

[0039] The mass ratio of the thickening agent, lubricating oil and additive is 1:30:0.1.

[0040] Example 7

[0041] A preparation method of a grease lubricant applied under high contact stress, comprising the following steps: According to the mass ratios of the thickener, lubricating oil and additive disclosed in the above embodiments, first add the thickener to the lubricating oil, heat and stir, and after it completely becomes a liquid, add the additive, and wait for the solution to cool to obtain the grease lubricant.

[0042] Example 8

[0043] Add 2 g of stearamide to 10 g of polyalphaolefin, where the mass ratio of the thickener to the lubricating oil is 1:5. Then heat-treat the mixed sample. After the solution becomes clear, add 0.01 g of graphene, stop heating, and let it stand for 1 h to obtain a semi-solid grease lubricant.

[0044] The tribological properties of the prepared grease lubricant were tested. The change of the friction coefficient of the lubricant used in this example between steel@steel with time is as Figure 2 shown. The test load is 10 N, the frequency is 4 Hz, and the amplitude is 2 mm. It can be found from Figure 2 that during the friction process, the friction coefficient of this lubricant remains at about 0.05 and is always stable.

[0045] Example 9

[0046] Add 3 g of glyceryl stearate citrate to 10 g of 500SN, where the mass ratio of the thickener to the lubricating oil is 3:10. Then heat-treat the mixed sample. After the solution becomes clear, add 0.02 g of copper phthalocyanine, stop heating, and stir for 1 h to obtain a semi-solid grease lubricant.

[0047] The tribological properties of the prepared grease lubricant were tested. Specifically, the reciprocating mode of a TRB3 friction and wear tester was used to test the friction performance. The upper friction pair is a steel ball with a diameter of 8 mm, and the lower friction pair is a steel block. Before the experiment, the friction pairs need to be ultrasonically treated in an ethanol and acetone solution for 10 minutes, then rinsed with deionized water, and finally dried in an oven. The test load is 50 N, the frequency is 4 Hz, the amplitude is 2 mm, and the test time is 4 h. The change of the friction coefficient of the grease lubricant used in this example between steel@steel with time is as Figure 3 shown. It can be found from Figure 3 that during the friction process, the friction coefficient of this lubricant remains at about 0.07 and is always stable.

Claims

1. A grease lubricant for use under high contact stress, characterized by: The grease lubricant is prepared by mixing lubricating oil, thickener and additives in a certain proportion.

2. The grease lubricant for use under high contact stress as claimed in claim 1, characterized in that: The lubricating oil is at least one of oleylamine, poly-α-olefin, liquid paraffin, 500SN, alkylated aromatics, long-chain alkanes, neopentyl glycol dioleate, monoricinoleyl glyceride, polyol ester oil, and mannitol oleate oil.

3. The grease lubricant for use under high contact stress as claimed in claim 1, characterized in that: The thickener is at least one of stearic acid amide, erucic acid amide, ferrous stearate, 12-hydroxystearic acid, glyceryl monostearate, hydroxycellulose, polyurethane, nicotinamide, ethylene dibutyl stearamide, ethylene lauric acid amide, and glyceryl stearate citrate.

4. The grease lubricant for use under high contact stress as claimed in claim 1, characterized in that: The additive is at least one of tungstic acid, decanol, propylene glycol, azelaic acid, zinc sulfide, graphene, boron nitride, halloysite, graphite fluoride, copper phthalocyanine, MODTC, and MODTP.

5. A grease lubricant for use under high contact stress as claimed in any one of claims 1 to 4, characterized in that: The mass ratio of the thickener, lubricating oil and additive is between 1:3:0.01 and 1:30:0.

1.

6. A method for preparing a grease lubricant for use under high contact stress as claimed in claim 5, comprising the following steps: According to the mass ratio of thickener, lubricating oil and additive, the thickener is first added to the lubricating oil, heated and stirred, and after it becomes completely liquid, the additive is added, and the solution is cooled to obtain a grease lubricant.

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