Automobile bearing lubricating grease and preparation method thereof

Abstract

The invention discloses automobile bearing lubricating grease and a preparation method thereof. The lubricating grease comprises the following components in percentage by mass: 70.5-80.5% of base oil; 13%-19% of a thickening agent; 6.5%-10.5% of an additive; wherein the base oil is alkyl diphenyl ether; the thickening agent is diurea and is prepared by reacting aniline, oleylamine and MDI; the additive comprises ammonium phosphonate and diethanol amine, and the ammonium phosphonate is ionic liquid. The bearing lubricating oil has excellent high-temperature resistance, oxidation resistance, water resistance, rust resistance and extreme pressure wear resistance and long service life, the phenomena of peeling, clamping stagnation, sintering and the like of a bearing are avoided after the bearing lubricating oil is used for a long time, the service life of the bearing is prolonged, and the occurrence rate of automobile faults is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of lubricating technology, in particular to a kind of automobile bearing grease and preparation method thereof. BACKGROUND

[0002] At present, the bearing on the car, such as the tensioner bearing, clutch separation bearing and the like, the grease used needs very high performance, including excellent high temperature oxidation resistance, low starting torque performance, water resistance and rust resistance, extreme pressure and wear resistance and shear loss resistance and the like. The existing grease will cause the crystal phase of the bearing surface to change after long-term use, causing the bearing to become brittle, the bearing surface to peel off and the like, thereby affecting the service life of the bearing and causing the incidence of automobile failure to increase. SUMMARY

[0003] The technical problem to be solved by the embodiments of the present application is to provide a kind of automobile bearing grease and preparation method thereof to improve the service life of the bearing.

[0004] To solve the above technical problems, the present application provides an automobile bearing grease, which comprises the following components by mass percentage: base oil 70.5%~80.5%; thickening agent 13%~19%; additive 6.5%~10.5%; Among them, the base oil is alkyl diphenyl ether; the thickening agent is diurea, which is prepared by reacting aniline, oleylamine and MDI; the additive includes ammonium phosphonate and diethanolamine, wherein the ammonium phosphonate is an ionic liquid.

[0005] The additive further includes one or more of a class of antioxidants, a class of antioxidants, anti-wear agents, extreme pressure agents and non-ferrous metal corrosion inhibitors.

[0006] Further, the additive further includes one or more of dibutyl diphenylamine, high molecular phenol, poly (1, 2-dihydroxy-2, 2, 4-trimethyl quinoline), trimethyl phenol phosphate, basic zinc dialkyldithiophosphate, benzotriazole derivative.

[0007] Further, the mass ratio of aniline, MDI and oleylamine of the thickening agent is 5.69:8.5:1.81.

[0008] Further, the mass ratio of dibutyl diphenylamine, high molecular phenol, poly (1, 2-dihydroxy-2, 2, 4-trimethyl quinoline), ammonium phosphonate, trimethyl phenol phosphate, basic zinc dialkyldithiophosphate, diethanolamine, benzotriazole derivative of the additive is 0.5:0.5:1:2:2:1:1:0.5.

[0009] Furthermore, the content of each component, by mass percentage, is as follows: Alkyl diphenyl ethers 75.5%; Aniline 5.69%; MDI 8.5%; Oleamine 1.81%; 0.5% dibutyldiphenylamine; 0.5% high molecular weight phenol; Poly(1,2-dihydroxy-2,2,4-trimethylquinoline) 1.0%; Ammonium phosphonate salt 2.0%; Tricresol phosphate 2.0%; Basic dialkyl dithiophosphate zinc 1.0%; Diethanolamine 1.0%; 0.5% of benzotriazole derivatives.

[0010] Furthermore, the viscosity of alkyl diphenyl ether is: 8~30mm 2 / s@100℃, 80~400mm 2 / s@40℃.

[0011] Accordingly, embodiments of the present invention also provide a method for preparing automotive bearing grease, comprising: Step 1: Prepare each component according to the mass percentage. Heat and stir 1 / 2 of the base oil and all of the aniline to 50-70℃ to dissolve, and obtain mixture A for later use. Step 2: Heat and stir 1 / 4 of the base oil and all of the MDI to 50-70℃ to dissolve, and obtain mixture B for later use; Step 3: Add oleylamine to mixture A and stir to obtain mixture C; Step 4: Add mixture C to mixture B to start the reaction, while turning off the heating. Add the remaining 1 / 4 of the base oil to mixture B to obtain mixture D. Step 5: When mixture D stops heating, turn on the heater and heat it to the preset temperature for refining. Maintain the temperature for 5-10 minutes, then add dibutyldiphenylamine, high molecular weight phenol, and poly(1,2-dihydroxy-2,2,4-trimethylquinoline) to obtain mixture E. Step 6: Cool mixture E to 70-80℃, add ammonium phosphonate, tricresyl phosphate, basic dialkyl dithiophosphate zinc, diethanolamine, and benzotriazole derivative to mixture E, and stir to obtain mixture F; Step 7: Extrude and grind mixture F to obtain automotive bearing grease.

[0012] Furthermore, the preset temperature range is 150±5℃.

[0013] The beneficial effects of this invention are as follows: This invention has excellent high temperature resistance and oxidation resistance, water resistance and rust prevention, extreme pressure anti-wear performance, and long service life. Even after long-term use, the bearing will not experience peeling, jamming, sintering, or other phenomena, thereby improving the service life of the bearing and reducing the incidence of automobile failures. Detailed Implementation

[0014] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will be further described in detail below with reference to specific embodiments.

[0015] The automotive bearing grease of this invention comprises, by mass percentage: 70.5%–80.5% base oil; 13%–19% thickener; and 6.5%–10.5% additives. The sum of the mass percentages of all the above components is 100%.

[0016] The base oil is an alkyl diphenyl ether. The viscosity of the alkyl diphenyl ether is: 8~30mm 2 / s@100℃, 80~400mm 2 / s@40℃.

[0017] The thickener is diurea, prepared by reacting aniline, oleylamine, and MDI (4,4'-methylene diphenyl diisocyanate, abbreviated as MDI). The additive of this invention consists of ammonium phosphonate salt and diethanolamine. In specific implementations, to improve performance and applicability to various complex working conditions, the additive also includes some commonly used additives in the industry, namely, one or more of the following: Class I antioxidants, Class II antioxidants, anti-wear agents, extreme pressure agents, and non-ferrous metal corrosion inhibitors. Preferably, the additive also includes one or more of the following: dibutyldiphenylamine, high molecular weight phenol, poly(1,2-dihydroxy-2,2,4-trimethylquinoline), tricresyl phosphate (industry code T306), basic dialkyl dithiophosphate zinc (industry code T203), and benzotriazole derivatives. Poly(1,2-dihydroxy-2,2,4-trimethylquinoline) is a commonly used plastic antioxidant, and in this invention, it is used as an antioxidant in lubricating grease. This invention uses alkyl diphenyl ether as the base oil, which can effectively prevent hydrogen embrittlement in bearings and bearing cylinders. The chemical formula of alkyl diphenyl ether is as follows: ; R1 and R2 are both saturated alkane groups, which can be monosubstituted or polysubstituted. The viscosity of alkyl diphenyl ether is determined by different substitutions and the chain length or branching of the alkane.

[0018] In one embodiment, the mass ratio of aniline, MDI, and oleylamine in the thickener is 5.69:8.5:1.81. This invention uses a diurea thickener formed from oleylamine, aniline, and MDI, which contain unsaturated double bonds. The double bonds in the oleylamine prevent the formation of additional hydrogen bonds (i.e., disrupt the formation of hardened hydrogen bonds), preventing the grease from hardening and extending its service life. The hydrogen bonds in the thickener are shown below: ; During use, double bonds can form new hydrogen bonds, breaking the original hydrogen bonds. The principle is as follows: ; In the formula, R1 to R4 are all saturated hydrocarbon groups or aromatic hydrocarbon groups.

[0019] The chemical reaction formula of the diurea thickener of the present invention is as follows (where diisocyanate is MDI): ; In the formula, R1 is a hydrocarbon group, represented by the following two types: (1) ; (2) ; (1) Toluene diisocyanate, abbreviated as TDI; (2) 4,4'-methylene-diphenyl diisocyanate, abbreviated as MDI. R2 and R3 are hydrocarbon groups, generally aliphatic alkyl or aromatic groups, which can be the same or different.

[0020] In one embodiment, the mass ratio of the additive dibutyldiphenylamine, high molecular weight phenol, poly(1,2-dihydroxy-2,2,4-trimethylquinoline), ammonium phosphonate, tricresyl phosphate, basic dialkyl dithiophosphate zinc, diethanolamine, and benzotriazole derivative is 0.5:0.5:1:2:2:1:1:0.5. The basic dialkyl dithiophosphate zinc of this invention provides sulfur, phosphorus, zinc, and other elements that can improve the anti-wear and extreme pressure properties of the grease. The dibutyldiphenylamine of this invention is an amine-type antioxidant, and the high molecular weight phenol is a phenol-type antioxidant; both are antioxidants that eliminate free radicals generated during the oxidation process of the grease, thereby preventing further oxidation. The poly(1,2-dihydroxy-2,2,4-trimethylquinoline) of this invention is a second-class antioxidant that eliminates hydrogen peroxide generated during the oxidation process, thereby preventing further oxidation. The phosphorus element provided by the tricresyl phosphate of this invention can play an anti-wear role, further improving the anti-wear properties of the grease. The diethanolamine of this invention is an organic weak base, exhibiting weak alkalinity, which can neutralize acidic substances generated by additives in the grease, thereby extending its service life and preventing metal corrosion due to acidity, leading to embrittlement. The benzotriazole derivative of this invention is a non-ferrous metal corrosion inhibitor, which can form a protective layer on the surface of bearings, bearing cylinders, etc. (non-ferrous metal surfaces), thereby preventing metal corrosion and extending the service life of the bearing. The benzotriazole derivative can enhance the adsorption of grease on metal surfaces, forming an adsorption layer on the surface.

[0021] The ammonium phosphonate salt of this invention, as an ionic liquid, provides excellent anti-wear and extreme pressure properties due to its ionic nature, thereby extending the service life of the grease. The chemical formula of the ammonium phosphonate salt is as follows: ; R1 and R2 are aliphatic hydrocarbon groups or aromatic hydrocarbon groups, and R1 and R2 can be the same or different.

[0022] As one implementation method, the component contents of automotive bearing grease, by mass percentage, are as follows: Alkyl diphenyl ethers 75.5%; Aniline 5.69%; MDI 8.5%; Oleamine 1.81%; 0.5% dibutyldiphenylamine; 0.5% high molecular weight phenol; Poly(1,2-dihydroxy-2,2,4-trimethylquinoline) 1.0%; Ammonium phosphonate salt 2.0%; Tricresol phosphate 2.0%; Basic dialkyl dithiophosphate zinc 1.0%; Diethanolamine 1.0%; 0.5% of benzotriazole derivatives.

[0023] The method for preparing automotive bearing grease according to embodiments of the present invention includes steps 1 to 7.

[0024] Step 1: Prepare each component according to the mass percentage. Heat and stir 1 / 2 of the base oil and all of the aniline to 50-70℃ to dissolve, and obtain mixture A for later use.

[0025] Step 2: Heat and stir 1 / 4 of the base oil and all of the MDI to 50-70℃ to dissolve, and obtain mixture B for later use.

[0026] Step 3: Add oleylamine to mixture A and stir to obtain mixture C.

[0027] Step 4: Add mixture C to mixture B to begin the reaction, while simultaneously turning off the heating. Add the remaining 1 / 4 of the base oil to mixture B to obtain mixture D. In practice, the container holding mixture C can be cleaned with the remaining 1 / 4 of the alkyl diphenyl ether before being added to mixture B.

[0028] Step 5: When mixture D stops heating, turn on the heater and heat it to the preset temperature (150±5℃) for refining. Maintain the temperature for 5-10 minutes, then add dibutyldiphenylamine, high molecular weight phenol, and poly(1,2-dihydroxy-2,2,4-trimethylquinoline) to obtain mixture E.

[0029] Step 6: Cool mixture E to 70-80℃, add ammonium phosphonate, tricresyl phosphate, basic dialkyl dithiophosphate zinc, diethanolamine, and benzotriazole derivative to mixture E, and stir to obtain mixture F.

[0030] Step 7: Extrude and grind mixture F to obtain automotive bearing grease.

[0031] Example 1: The components of the present invention are shown in Table 1.

[0032]

[0033] The technical parameters of the base oil (alkyl diphenyl ether) in Example 1 are shown in Table 2.

[0034]

[0035] The physicochemical properties of Example 1 are shown in Table 3.

[0036]

[0037] The preparation steps of Example 1 are shown in Table 4.

[0038]

[0039] Example 2: Based on Example 1, the base oil of this invention is completely replaced with PAO. The components of Example 2 are shown in Table 5.

[0040]

[0041] The preparation steps for Example 2 are the same as those for Example 1.

[0042] The technical parameters of PAO 10 in Example 2 are shown in Table 6.

[0043]

[0044] The physicochemical properties of Example 2 are shown in Table 7.

[0045]

[0046] Example 3: Based on Example 1, the thickener is replaced with composite lithium. The components of Example 3 are shown in Table 8.

[0047]

[0048] The physicochemical properties of Example 3 are shown in Table 9.

[0049]

[0050] Example 3 The manufacturing process adopts the preparation steps conventional in the art.

[0051] The experimental products in Embodiments 1, 2, and 3 of this invention use an automotive clutch release bearing (bearing model Y060-PV1; outer diameter: 66.8mm; inner diameter: 32.7mm) from a certain company. The experimental equipment uses an automotive hydraulic release bearing durability testing machine, which basically consists of a control cabinet, a testing device, and a main shaft lubrication oil tank. Working principle: Simulating the working conditions of a hydraulic release bearing in a real environment, a load loading device is installed at one end of the main shaft. The load loading device includes a flywheel, a clutch, and a test bearing, with the clutch fixed to the flywheel. Load loading is powered by pneumatic-hydraulic transmission, applying a constant or reciprocating force to the hydraulic release bearing. A frequency converter controls the main shaft to drive the flywheel and clutch to rotate. The industrial control computer controls the air valve to actuate the cylinder, which in turn drives the oil pump to generate hydraulic transmission. Under the action of hydraulic force, the release bearing performs an axial reciprocating motion against the clutch.

[0052] The specific testing requirements for each embodiment of the present invention are shown in Table 10:

[0053] Each embodiment of the present invention is subjected to uninterrupted testing according to the above procedure. The bearing operates more than 600,000 times in one cycle; three cycles are performed, for a total of more than 1.8 million times.

[0054] Test results: (1) The bearing with the grease of Example 3 was tested for 759,849 cycles. The bearing did not work smoothly and the test was stopped. Upon disassembly, it was found that the grease was dry and coked, and the bearing was stuck.

[0055] (2) The durability of the separation bearing after adding the grease of Example 2 was 1,162,304 cycles. The bearing made abnormal noise, and the test was stopped. Upon disassembly, it was found that the grease was dry and coked.

[0056] (3) The release bearing, which was filled with the grease of Example 1, operated for 1802099 cycles and reached the required lifespan. The bearing was well lubricated and rotated freely; there were no signs of peeling, jamming, or sintering.

[0057] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A type of automotive bearing grease, characterized in that, By mass percentage, it includes the following components: Base oil 70.5%–80.5%; Thickener 13%–19%; Additives: 6.5%–10.5%; The base oil is an alkyl diphenyl ether; the thickener is a diurea, which is prepared by reacting aniline, oleylamine and MDI; the additives include ammonium phosphonate and diethanolamine, wherein the ammonium phosphonate is an ionic liquid.

2. The automotive bearing grease as described in claim 1, characterized in that, Additives also include one or more of the following: Class I antioxidants, Class II antioxidants, anti-wear agents, extreme pressure agents, and non-ferrous metal corrosion inhibitors.

3. The automotive bearing grease as described in claim 1, characterized in that, The additives also include one or more of the following: dibutyldiphenylamine, high molecular weight phenol, poly(1,2-dihydroxy-2,2,4-trimethylquinoline), tricresyl phosphate, basic dialkyl dithiophosphate zinc, and benzotriazole derivatives.

4. The automotive bearing grease as described in claim 1, characterized in that, The mass ratio of aniline, MDI and oleylamine in the thickener is 5.69:8.5:1.

81.

5. The automotive bearing grease as described in claim 3, characterized in that, The mass ratio of the additives, namely dibutyldiphenylamine, high molecular weight phenol, poly(1,2-dihydroxy-2,2,4-trimethylquinoline), ammonium phosphonate, tricresyl phosphate, basic dialkyl dithiophosphate zinc, diethanolamine, and benzotriazole derivative, is 0.5:0.5:1:2:2:1:1:0.

5.

6. The automotive bearing grease as described in claim 3, characterized in that, The content of each component, by mass percentage, is as follows: Alkyl diphenyl ethers 75.5%; Aniline 5.69%; MDI 8.5%; Oleamine 1.81%; 0.5% dibutyldiphenylamine; 0.5% high molecular weight phenol; Poly(1,2-dihydroxy-2,2,4-trimethylquinoline) 1.0%; Ammonium phosphonate salt 2.0%; Tricresol phosphate 2.0%; Basic dialkyl dithiophosphate zinc 1.0%; Diethanolamine 1.0%; 0.5% of benzotriazole derivatives.

7. The automotive bearing grease as described in claim 1, characterized in that, The viscosity of alkyl diphenyl ether is: 8~30mm 2 / s@100℃, 80~400mm 2 / s@40℃。 8. The method for preparing automotive bearing grease according to any one of claims 1-7, characterized in that, include: Step 1: Prepare each component according to the mass percentage. Heat and stir 1 / 2 of the base oil and all of the aniline to 50-70℃ to dissolve, and obtain mixture A for later use. Step 2: Heat and stir 1 / 4 of the base oil and all of the MDI to 50-70℃ to dissolve, and obtain mixture B for later use; Step 3: Add oleylamine to mixture A and stir to obtain mixture C; Step 4: Add mixture C to mixture B to start the reaction, while turning off the heating. Add the remaining 1 / 4 of the base oil to mixture B to obtain mixture D. Step 5: When mixture D stops heating, turn on the heater and heat it to the preset temperature for refining. Maintain the temperature for 5-10 minutes, then add dibutyldiphenylamine, high molecular weight phenol, and poly(1,2-dihydroxy-2,2,4-trimethylquinoline) to obtain mixture E. Step 6: Cool mixture E to 70-80℃, add ammonium phosphonate, tricresyl phosphate, basic dialkyl dithiophosphate zinc, diethanolamine, and benzotriazole derivative to mixture E, and stir to obtain mixture F; Step 7: Extrude and grind mixture F to obtain automotive bearing grease.

9. The method for preparing automotive bearing grease as described in claim 8, characterized in that, The preset temperature range is 150±5℃.

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