A wear-resistant broken head lubricating grease and a preparation method thereof

Abstract

This invention belongs to the field of lubricating grease technology, specifically relating to a wear-resistant damaged head grease and its preparation method. The damaged head grease comprises the following raw materials: 500N composite aluminum-based grease, 68# trimethylol oleate, graphite, copper powder, inactive sulfur extreme pressure agent, and antioxidant. The preparation method of the 500N composite aluminum-based grease includes first mixing a portion of the 500N base oil with aluminum isopropoxide; then sequentially adding stearic acid and benzoic acid while stirring; then adding water and stirring; finally adding the remaining 500N base oil, stirring, and homogenizing to obtain the 500N composite aluminum-based grease. The grease of this invention performs excellently in applications such as excavator chisels, fixing rods, and bushings, significantly reducing wear, extending service life, and improving the working efficiency and stability of mechanical equipment. It not only provides a new solution for the lubrication of mechanical equipment but also has broad application prospects and significant economic benefits.

Description

Technical Field

[0001] This invention belongs to the field of lubricating grease technology, specifically relating to a wear-resistant damaged head lubricating grease and its preparation method. Background Technology

[0002] In mechanical equipment, especially for components subjected to high loads, high speeds, or harsh working environments, such as the breaker head, bearings, and gears of excavators, the performance requirements for lubricating greases are extremely high. While traditional lubricating greases can meet the lubrication needs of these components to some extent, they often have some significant drawbacks.

[0003] Most existing lubricating greases use basic grease formulations, which are insufficient in terms of wear resistance, extreme pressure properties, and oxidation resistance. Especially under high load and impact conditions, the wear resistance of traditional lubricating greases often fails to meet requirements, leading to accelerated component wear and shortened service life. Furthermore, traditional lubricating greases have limited lubrication performance under extreme pressures, easily resulting in direct metal-to-metal contact, further exacerbating wear and friction.

[0004] Meanwhile, the adhesion and water resistance of existing greases need to be improved. Under high-speed operation or humid environments, grease is prone to falling off or being corroded by water, thus losing its lubricating effect and causing component damage.

[0005] Chinese invention patent application CN104403734A discloses an improved wear-resistant extreme pressure additive for lubricating oils. This improved additive is made from the following raw materials in parts by weight: 6-11 parts tricresyl phosphate, 4-8 parts xylene, 3-9 parts polyisobutylene bis(succinimide), 5-7 parts zinc sulfide phosphate, 6-8 parts calcium alkylphenolate sulfide, 7-9 parts n-butyl acetate, 3-8 parts oleanolic acid, 2-8 parts tetrahydropalmatine, 5-10 parts dibutyl phosphite, 6-10 parts phenyl diisooctyl phosphite, 2-6 parts nonionic surfactant, 5-8 parts colloidal graphite, 4-8 parts alkyl sulfonic acid, and 1-5 parts salicylic acid. This improved wear-resistant extreme pressure additive for lubricating oils can improve the quality of lubricating oils, significantly enhances their extreme pressure properties, and is also low in cost and easy to use.

[0006] Although existing technologies have conducted some research on the types and contents of additives in greases, the overall performance of greases still needs to be further improved. The existing greases have significant deficiencies in terms of wear resistance, extreme pressure properties, adhesion, and water resistance, making it difficult to meet the lubrication needs of components under high load, high speed, or harsh working environments.

[0007] Therefore, there is an urgent need to develop a higher-performance and more adaptable grease to solve the problems in the existing technology. Summary of the Invention

[0008] To address the shortcomings of existing technologies, this invention provides a wear-resistant grease for damaged heads and its preparation process.

[0009] To achieve the objectives of this invention, the following technical solution is adopted:

[0010] A wear-resistant grease for broken heads, the grease comprising the following raw materials: 500N composite aluminum-based grease, 68# trimethylol oleate, graphite, copper powder, non-reactive sulfur extreme pressure agent, and antioxidant.

[0011] Preferably, by weight, the damaged head grease comprises the following raw materials: 60-80 parts of 500N composite aluminum-based grease, 8-12 parts of 68# trimethylol oleate, 8-12 parts of graphite, 1-5 parts of copper powder, 1-5 parts of non-active sulfur extreme pressure agent, and 1-5 parts of antioxidant.

[0012] Preferably, by weight, the damaged head grease comprises the following raw materials: 60-80 parts of 500N composite aluminum-based grease, 8-12 parts of 68# trimethylol oleate, 8-12 parts of graphite, 1-4 parts of copper powder, 1-3 parts of non-active sulfur extreme pressure agent, and 2-5 parts of antioxidant.

[0013] Preferably, the antioxidant is antioxidant 330.

[0014] Preferably, the raw materials of the damaged head grease include 500N base oil, aluminum isopropoxide, stearic acid, benzoic acid and water.

[0015] Preferably, by weight, the raw materials of the damaged head grease include 100-150 parts of 500N base oil, 5-10 parts of aluminum isopropoxide, 5-12 parts of stearic acid, 1-10 parts of benzoic acid, and 1-5 parts of water.

[0016] Preferably, the preparation method of the 500N composite aluminum-based grease includes the following steps:

[0017] (1) Add a portion of 500N base oil to aluminum isopropoxide and mix;

[0018] (2) Then add stearic acid and benzoic acid in sequence and stir.

[0019] (3) Add water and stir;

[0020] (4) Add the remaining 500N base oil, stir, and homogenize to obtain 500N composite aluminum-based grease.

[0021] Preferably, in step (1), the 500N base oil is heated to 70-90°C and then aluminum isopropoxide is added and mixed.

[0022] Preferably, in step (2), the temperature is first raised to 120-130°C, then stearic acid is added and stirred, followed by the addition of benzoic acid and stirring. Preferably, stearic acid is added and stirred at 60-90 rpm for half an hour.

[0023] Preferably, in step (3), the temperature is first lowered to 100-105℃, then water is added and stirred. Preferably, the water is added and the mixture is kept at 102℃ and stirred at 60-90 rpm for 2-5 hours.

[0024] Preferably, in step (4), the temperature is first raised to 210-230°C, then the remaining 500N base oil is added, and the mixture is stirred and cooled to 120-140°C to obtain 500N composite aluminum-based grease.

[0025] Preferably, the 500N base oil in step (1) is 60-80% by mass of 500N base oil.

[0026] Preferably, the working penetration of the 500N composite aluminum-based grease is 265-295.

[0027] Preferably, the graphite has a mesh size of 800.

[0028] Preferably, the purity of the 68# trihydroxymethyl oleate is not less than 99%.

[0029] Preferably, the inactive sulfur extreme pressure agent is a sulfurized fatty acid ester.

[0030] Preferably, the sulfurized fatty acid ester is an inactive sulfur extreme pressure anti-wear agent XP3015.

[0031] Preferably, the copper powder has a particle size of 10-50 μm and a purity of not less than 99%.

[0032] Preferably, the working cone penetration of the wear-resistant damaged head grease is 265-295.

[0033] Another object of the present invention is to provide a method for preparing the above-mentioned wear-resistant damaged head grease, comprising the following steps:

[0034] S1. Take 500N composite aluminum-based grease and 68# trimethylol oleate, mix and stir.

[0035] S2, add graphite, copper powder, non-reactive sulfur extreme pressure agent and antioxidant;

[0036] S3. Continue stirring to deaerate, homogenize, and cool to room temperature to obtain the final product.

[0037] Preferably, the temperature is adjusted to 60-70°C during stirring in step S1.

[0038] Another object of the present invention is to provide the application of the said broken head grease in lubricating the excavator chisel, retaining rod and bushing.

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] This invention produces a high-performance grease by precisely proportioning various raw materials, including 500N composite aluminum-based grease, 68# trimethylol oleate, graphite, copper powder, inactive sulfur extreme pressure agent, and antioxidant. The unique preparation process of the 500N composite aluminum-based grease ensures its excellent working penetration and lubrication performance. The specifications and purity of the graphite and copper powder are strictly controlled, effectively improving the grease's wear resistance and anti-wear properties. The selection of the inactive sulfur extreme pressure agent further enhances the grease's lubrication effect under extreme pressure.

[0041] Furthermore, the grease preparation method of this invention is simple and efficient. Through specific process steps, the raw materials are fully mixed and work synergistically to produce a high-performance wear-resistant and breakage-resistant grease. This grease has a moderate working cone penetration, ensuring good lubrication while facilitating application and use in practical applications. The wear-resistant and breakage-resistant grease of this invention performs excellently in applications such as excavator chisels, fixing rods, and bushings, significantly reducing wear, extending service life, and improving the working efficiency and stability of mechanical equipment. Therefore, this invention not only provides a new solution for the lubrication of mechanical equipment but also has broad application prospects and significant economic benefits. Attached Figure Description

[0042] Figure 1 Water loss during leaching in Examples 1-5 (38°C, 1h), %;

[0043] Figure 2 Water loss during leaching in Comparative Examples 1-5 (38℃, 1h), %;

[0044] Figure 3 Four-ball test in Examples 1-5: PB / N;

[0045] Figure 4 Four-ball test in Comparative Examples 1-5: PB / N;

[0046] Figure 5 Four-ball test in Examples 1-5: PD / N;

[0047] Figure 6 Four-ball test in Comparative Examples 1-5: PD / N;

[0048] Figure 7 The coefficient of friction in Examples 1-5 is 687 N.

[0049] Figure 8The coefficient of friction for comparative examples 1-5 is 687 N. Detailed Implementation

[0050] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0051] Examples 1-5

[0052] This example is a preparation example. The formulations of Examples 1-5 are shown in Table 1.

[0053] Table 1. Lubricating Grease Formulation

[0054]

[0055] The 500N composite aluminum-based grease is prepared by the following steps, where the parts in each step are relative parts by weight:

[0056] (1) Add 100 parts of 500N base oil to the reactor, heat to 80°C, and add 7 parts of aluminum isopropoxide (industrial grade);

[0057] (2) Heat to 125℃, add 9.6 parts of stearic acid, keep the temperature constant at 60 rpm and stir for half an hour, then add 4.2 parts of benzoic acid;

[0058] (3) Stir and cool down to 102°C, slowly add 2.6 parts of distilled water, and stir at 90 rpm for 3 hours at a constant temperature of 102°C.

[0059] (4) Heat to 220℃, stop heating, transfer the material in the kettle to the blending kettle, and prepare 30 parts of 500N base oil in advance for the blending kettle;

[0060] (5) The material in the mixing tank is stirred and cooled to 130°C, and homogenized to obtain a composite aluminum-based grease with a working cone penetration of 265-295.

[0061] The preparation method of the damaged head grease in Examples 1-5 above includes the following steps:

[0062] S1. Take the prescribed amount of 500N composite aluminum-based grease and 68# trimethylol oleate, add them to the reaction vessel, stir and slowly heat to 65℃;

[0063] S2. Add the formulated amounts of graphite, copper powder, non-reactive sulfur extreme pressure agent, and antioxidant to the above-mentioned reaction vessel;

[0064] S3. Continue stirring and degassing for 2 hours, homogenize, and cool to room temperature to obtain the wear-resistant crusher head grease.

[0065] Comparative Example 1

[0066] Replace the 500N composite aluminum-based grease with Kunlun extreme pressure lithium-based grease, and the rest is the same as in Example 2.

[0067] Comparative Example 2

[0068] The synthetic ester base oil Priolube 2720 was used to replace 68# trimethylol oleate, and the rest was the same as in Example 2.

[0069] Comparative Example 3

[0070] It does not contain graphite or copper powder, and the remaining components and proportions are the same as in Example 2.

[0071] Comparative Example 4

[0072] Use commercially available Great Wall extreme pressure lithium-based grease No. 1.

[0073] Comparative Example 5

[0074] The difference between this comparative example and Example 2 lies in the preparation method of the 500N composite aluminum-based grease. Specifically:

[0075] Aluminum isopropoxide, benzoic acid, stearic acid, 500N base oil and water were mixed and stirred at 85°C at 90 rpm for 2.5 h to complete the initial stirring. Then the temperature was increased to 155°C at 4°C / min and stirred at 120 rpm for 3.5 h to complete the secondary stirring to obtain the composite aluminum-based grease.

[0076] Test case

[0077] The performance of the damaged head greases prepared in Examples 1-5 and Comparative Examples 1-5, as well as the commercial grease of Comparative Example 5, was tested. The test results are shown in Tables 2 and 3. Figures 1-8 As shown.

[0078] Table 2 Sample test data from Examples 1-5

[0079]

[0080] Table 3. Detection data of samples from Comparative Examples 1-5

[0081] Comparison of test items 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Unworked cone penetration (25℃), 0.1mm232 245 285 320 353 Drip 201 298 331 202 245 Evaporation rate (99℃, 22h), % (m / m): 1.65 1.78 1.34 2.12 1.76 Water loss (38℃, 1h), % 0.9 0.5 0.4 1.3 1.5 Corrosion (T2 copper, 100℃*24h) 1b 1b 1b 2b 1b Four-ball test: PB / N, ≥700 784 735 588 588 686 Four-ball test: PD / N, ≥6080 4900 4900 2450 3087 3087 Coefficient of friction / 687N, ≤ 0.07 0.06 0.12 0.13 0.103 0.07

[0082] As can be seen from the data comparing Examples 1-5 and Comparative Example 4 in Tables 2-3, compared with existing extreme pressure lithium-based greases, the damaged head grease disclosed in this invention has good lubricity and extreme pressure anti-wear properties, as well as water resistance, suitable cone penetration, and good high-temperature resistance. Comparing Example 2 with Comparative Examples 1-3 and 5 shows that the addition of our self-made 500N composite aluminum-based grease results in higher operating temperatures, better low-temperature fluidity, and excellent water resistance.

[0083] Meanwhile, after using the broken head grease prepared in Example 2 of the present invention and the grease in Comparative Example 4 in parallel between the excavator chisel, fixing rod and bushing for a period of time, it was found that the service life of the grease described in the present invention is 40% longer than that of commercially available extreme pressure lithium-based grease, and at the same time it can provide better lubrication effect.

[0084] In summary, this invention prepares a high-performance grease by precisely proportioning various raw materials, including 500N composite aluminum-based grease, 68# trimethylol oleate, graphite, copper powder, inactive sulfur extreme pressure agent, and antioxidant. The unique preparation process of the 500N composite aluminum-based grease ensures its excellent working penetration and lubrication performance. The specifications and purity of the graphite and copper powder are strictly controlled, effectively synergistically improving the grease's wear resistance and anti-wear properties. The selection of the inactive sulfur extreme pressure agent further synergistically enhances the grease's lubrication effect under extreme pressure.

[0085] The above are merely a few preferred embodiments of the present invention, described in a relatively specific and detailed manner, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention.

Claims

1. A wear-resistant grease for damaged heads, characterized in that, The damaged head grease comprises the following raw materials: 500N composite aluminum-based grease, 68# trimethylol oleate, graphite, copper powder, non-reactive sulfur extreme pressure agent, and antioxidant.

2. The grease for damaged heads according to claim 1, characterized in that, By weight, the damaged head grease comprises the following raw materials: 60-80 parts of 500N composite aluminum-based grease, 8-12 parts of 68# trimethylol oleate, 8-12 parts of graphite, 1-5 parts of copper powder, 1-5 parts of non-reactive sulfur extreme pressure agent, and 1-5 parts of antioxidant.

3. The grease for damaged heads according to claim 1, characterized in that, By weight, the damaged head grease comprises the following raw materials: 60-80 parts of 500N composite aluminum-based grease, 8-12 parts of 68# trimethylol oleate, 8-12 parts of graphite, 1-4 parts of copper powder, 1-3 parts of non-reactive sulfur extreme pressure agent, and 2-5 parts of antioxidant.

4. The grease for damaged heads according to claim 1, characterized in that, The antioxidant is antioxidant 330.

5. The wear-resistant damaged head grease according to claim 1, characterized in that, The raw materials for the damaged head grease include 500N base oil, aluminum isopropoxide, stearic acid, benzoic acid, and water.

6. The wear-resistant damaged head grease according to claim 5, characterized in that, By weight, the raw materials of the damaged head grease include 100-150 parts of 500N base oil, 5-10 parts of aluminum isopropoxide, 5-12 parts of stearic acid, 1-10 parts of benzoic acid and 1-5 parts of water.

7. The wear-resistant damaged head grease according to claim 5, characterized in that, The preparation method of the 500N composite aluminum-based grease includes the following steps: (1) Add a portion of 500N base oil to aluminum isopropoxide and mix; (2) Then add stearic acid and benzoic acid in sequence and stir. (3) Add water and stir; (4) Add the remaining 500N base oil, stir, and homogenize to obtain 500N composite aluminum-based grease.

8. The wear-resistant damaged head grease according to claim 7, characterized in that, In step (1), the 500N base oil is heated to 70-90℃ and then aluminum isopropoxide is added and mixed.

9. The wear-resistant damaged head grease according to claim 7, characterized in that, In step (2), the temperature is first raised to 120-130℃, then stearic acid is added and stirred, and then benzoic acid is added and stirred.

10. The wear-resistant damaged head grease according to claim 7, characterized in that, In step (3), first cool down to 100-105℃, then add water and stir.

11. The wear-resistant damaged head grease according to claim 7, characterized in that, In step (4), the temperature is first raised to 210-230℃, then the remaining 500N base oil is added, and the temperature is lowered to 120-140℃ by stirring and homogenizing to obtain 500N composite aluminum-based grease.

12. The wear-resistant damaged head grease according to claim 7, characterized in that, The 500N base oil mentioned in step (1) is 60-80% by mass of 500N base oil.

13. The wear-resistant damaged head grease according to any one of claims 1-12, wherein the working cone penetration of the 500N composite aluminum-based grease is 265-295.

14. The wear-resistant damaged head grease according to claim 1, characterized in that, The graphite has a mesh size of 700-900.

15. The wear-resistant damaged head grease according to claim 1, characterized in that, The purity of the 68# trihydroxymethyl oleate is not less than 99%.

16. The wear-resistant damaged head grease according to claim 1, characterized in that, The inactive sulfur extreme pressure agent is a sulfurized fatty acid ester.

17. The wear-resistant damaged head grease according to claim 16, characterized in that, The sulfurized fatty acid ester is XP3015, a non-active sulfur extreme pressure anti-wear agent.

18. The wear-resistant damaged head grease according to claim 1, characterized in that, The copper powder has a particle size of 10-50 μm and a purity of not less than 99%.

19. The wear-resistant damaged head grease according to claim 1, characterized in that, The working cone penetration of the grease used for the damaged head is 265-295.

20. The method for preparing the wear-resistant damaged head grease according to any one of claims 1-19, characterized in that, Includes the following steps: S1. Take 500N composite aluminum-based grease and 68# trimethylol oleate, mix and stir. S2, add graphite, copper powder, non-reactive sulfur extreme pressure agent and antioxidant; S3. Continue stirring to deaerate, homogenize, and cool to room temperature to obtain the final product.

21. The preparation method according to claim 20, characterized in that, During the stirring process described in step S1, the temperature is simultaneously adjusted to 60-70℃.

22. The use of the broken head grease as described in any one of claims 1-19 in lubricating the excavator's chisel, retaining rod, and bushing.

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