Harmonic reducer lubricating grease and preparation method thereof

Abstract

This invention provides a harmonic reducer grease and its preparation method. The harmonic reducer grease comprises, by weight, 70-90 parts base oil, 5-10 parts thickener, and 1-5 parts structure improver. Compared with existing products, the harmonic reducer grease provided by this invention has superior rheological properties. It becomes thinner after shearing, allowing it to fully penetrate the friction pair gap, reducing internal resistance. After the equipment stops or is no longer in use, the grease structure can recover, effectively reducing the risk of oil leakage.

Description

Technical Field

[0001] This invention belongs to the field of lubrication technology, specifically relating to a harmonic reducer grease and its preparation method, and more particularly to a harmonic reducer grease with good structural recovery effect and its preparation method. Background Technology

[0002] Harmonic reducers are a common type of transmission equipment, widely used in the moving joints of industrial robots, robotic arms, and other devices. They have advantages such as small size, high precision, and smooth operation, and grease is usually used as the lubricant for this equipment.

[0003] Currently, the main types of harmonic reducer grease on the market are Japanese HARMONIC GREASE SK-1A, SK-2, and 4B-No.2. Other brands offer a mixed bag of products, and their performance is far inferior to these greases. 4B-No.2, in particular, has unique thixotropic properties that make it ideal for lubricating harmonic gears, and there are currently no comparable alternatives.

[0004] CN111334362A discloses a long-life industrial robot lubricating grease. The raw materials used to prepare the grease, by weight, include the following components: 100-120 parts base oil; 28.5-30.5 parts thickener; 2-3.5 parts oil separation inhibitor; 3-4.5 parts extreme pressure anti-wear agent; 1-1.5 parts friction modifier; 2.5-3.5 parts antioxidant; 1.5-3.5 parts rust inhibitor; and 0.1-0.5 parts metal passivator. The extreme pressure anti-wear agent includes potassium triborate, phosphorus-nitrogen derivatives, and modified nano-graphene dispersion. The industrial robot lubricating grease provided by this invention exhibits good colloidal stability, excellent extreme pressure anti-wear performance, and long-lasting service life.

[0005] CN117050799A discloses a lubricating grease, its preparation method, and its application. The raw materials for preparing the lubricating grease include the following components by weight percentage: 60-80% base oil, 5-15% thickener, 5-15% structure modifier, and 5-15% extreme pressure anti-wear agent. The thickener is prepared from diisocyanate and organic amine. The lubricating grease of this invention exhibits good anti-friction and anti-wear properties, oxidation resistance, excellent mechanical stability, colloidal stability, high and low temperature adaptability, and fluidity. It is also reasonably priced and can be used for the lubrication of precision instruments.

[0006] However, none of the above solutions demonstrated superior technical performance compared to 4B-No.2. Therefore, how to provide a harmonic reducer grease that can replace existing products and further improve performance has become an urgent problem to be solved. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the present invention aims to provide a harmonic reducer grease and its preparation method, particularly a harmonic reducer grease with excellent structural recovery and its preparation method. Compared to existing products, the harmonic reducer grease provided by this invention exhibits superior rheological properties, becoming thinner after shearing, allowing it to fully penetrate the friction pair gaps, reducing internal resistance. When the equipment stops or is not in operation, the grease structure can recover, effectively reducing the risk of oil leakage.

[0008] To achieve this objective, the present invention adopts the following technical solution:

[0009] On one hand, the present invention provides a harmonic reducer grease, wherein the harmonic reducer grease comprises, by weight, 70-90 parts of base oil, 5-10 parts of thickener and 1-5 parts of structure improver.

[0010] The base oil can be 70, 75, 80, 85, or 90 parts, the thickener can be 5, 6, 7, 8, 9, or 10 parts, and the structure modifier can be 1, 2, 3, 4, or 5 parts, but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0011] Compared to existing products, the harmonic reducer grease with the above-mentioned specific components has better rheological properties. It becomes thinner after being sheared, which allows it to fully enter the gap between the friction pairs, reducing the internal resistance of the grease. After the equipment stops or is not used, the grease structure can be restored, effectively reducing the risk of oil leakage.

[0012] Preferably, the base oil comprises synthetic hydrocarbon oils and / or ester oils.

[0013] Preferably, the thickener includes isocyanate thickeners and amine thickeners.

[0014] Preferably, the isocyanate thickener includes diphenylmethane diisocyanate (MDI) and / or toluene diisocyanate (TDI).

[0015] Preferably, the amine thickener includes any one or a combination of at least two of n-octylamine, aniline, cyclohexylamine, p-toluidine, or octadecylamine.

[0016] Preferably, the structure modifier comprises stearamide and / or n-octadecyl alcohol, and more preferably a combination of stearamide and n-octadecyl alcohol.

[0017] The aforementioned specific structure modifiers can effectively improve the structural recovery effect of the product; and by using stearamide and octadecyl alcohol in combination, the synergistic effect of the product's structural recovery effect is further improved.

[0018] Preferably, the harmonic reducer grease further includes 0.5-1.5 parts by weight of antioxidant.

[0019] Preferably, the harmonic reducer grease further includes 0.1-1 parts by weight of rust inhibitor.

[0020] Preferably, the harmonic reducer grease further includes 1-5 parts by weight of anti-wear agent.

[0021] The antioxidant can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, or 1.5 parts, etc.; the rust inhibitor can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, or 1 part, etc.; and the anti-wear agent can be 1, 2, 3, 4, or 5 parts, etc., but is not limited to the values ​​listed above. Other unlisted values ​​within the above range are also applicable.

[0022] On the other hand, the present invention also provides a method for preparing the harmonic reducer grease as described above, the method comprising the following steps:

[0023] The base oil and thickener are mixed, heated and kept at that temperature, and then mixed and ground with a structure modifier to obtain the harmonic reducer grease.

[0024] Preferably, the grinding with the structure modifier further includes grinding with antioxidants, anti-wear agents and rust inhibitors.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] This invention provides a harmonic reducer grease that has superior rheological properties compared to existing products. It becomes thinner after being sheared, allowing it to fully penetrate the friction pair gap, reducing internal resistance. The grease structure can be restored after the equipment stops or is no longer used, effectively reducing the risk of oil leakage. At the same time, the structure recovery effect of the product is further improved by using a specific structure modifier. Detailed Implementation

[0027] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0028] Example 1

[0029] This embodiment provides a harmonic reducer grease, the specific composition of which is as follows:

[0030]

[0031] The preparation method is as follows:

[0032] The base oils PAO6, mPAO150, and trimellitate were mixed and added to a reaction vessel. Then, MDI and TDI were added, and the mixture was heated to 50°C. Octylamine, aniline, and cyclohexylamine were added to react. The mixture was then heated to 150°C and held at that temperature. After cooling, antioxidants, anti-wear agents, rust inhibitors, stearamide, and n-octadecyl alcohol were added and mixed. The mixture was then ground using a three-roll mill to obtain the harmonic reducer grease.

[0033] Example 2

[0034] This embodiment provides a harmonic reducer grease, the specific composition of which is as follows:

[0035]

[0036] The preparation method is the same as in Example 1.

[0037] Example 3

[0038] This embodiment provides a harmonic reducer grease, the specific composition of which is as follows:

[0039]

[0040] The preparation method is the same as in Example 1.

[0041] Example 4

[0042] This embodiment provides a harmonic reducer grease, whose specific composition is the same as that of Example 1, except that it does not contain stearamide and a portion is reduced in the amount allocated to n-octadecyl alcohol.

[0043] Example 5

[0044] This embodiment provides a harmonic reducer grease, whose specific composition is the same as that of Example 1, except that it does not contain n-octadecyl alcohol and a portion of it is allocated to stearamide.

[0045] Example 6

[0046] This embodiment provides a harmonic reducer grease, which is identical to that in Embodiment 1 except that stearamide is replaced with an equal amount of oleamide.

[0047] Example 7

[0048] This embodiment provides a harmonic reducer grease, which is identical to that of Example 1 except that stearamide is replaced with an equal amount of dodecylamide.

[0049] Effect test:

[0050] The products provided in Examples 1-7 were compared with the Japanese HARMONIC GREASE 4B-No.2 product in terms of effectiveness. The test items and results are as follows:

[0051]

[0052]

[0053] The data above shows that the product provided by this invention has superior rheological properties compared to existing products. It becomes thinner under shear stress (the cone penetration changes more significantly after 60 cycles and 100,000 cycles), allowing it to fully penetrate the friction pair gaps and reduce internal resistance. After equipment stops or is no longer in use, the grease structure can recover, reducing the risk of oil leakage. Comparing Examples 1 and 4-7 reveals that this invention, through the deliberate use of a combination of stearamide and octadecyl alcohol, achieves a synergistic effect, further improving the product's structural recovery effect compared to other structure modifiers.

[0054] The applicant declares that this invention illustrates the harmonic reducer lubricating grease and its preparation method through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials of this invention, additions of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

[0055] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0056] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable way without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A harmonic reducer lubricating grease, characterized in that, The harmonic reducer grease comprises, by weight, 70-90 parts base oil, 5-10 parts thickener, and 1-5 parts structure improver; The structure modifier is a combination of stearamide and n-octadecyl alcohol; The base oils include synthetic hydrocarbon oils and / or ester oils; The thickener includes isocyanates and amines; The isocyanates include diphenylmethane diisocyanate and / or toluene diisocyanate; The amines include any one or a combination of at least two of the following: n-octylamine, aniline, cyclohexylamine, p-toluidine, or octadecylamine.

2. The harmonic reducer grease according to claim 1, characterized in that, The harmonic reducer grease also includes 0.5-1.5 parts by weight of antioxidant.

3. The harmonic reducer grease according to claim 1, characterized in that, The harmonic reducer grease also includes 0.1-1 parts by weight of rust inhibitor.

4. The harmonic reducer grease according to claim 1, characterized in that, The harmonic reducer grease also includes 1-5 parts by weight of anti-wear agent.

5. A method for preparing a harmonic reducer grease according to any one of claims 1-4, characterized in that, The preparation method includes the following steps: The base oil and thickener are mixed, heated and kept at that temperature, and then mixed and ground with a structure modifier to obtain the harmonic reducer grease.

6. The preparation method according to claim 5, characterized in that, The grinding process involving the structural modifier also includes grinding involving the antioxidant, anti-wear agent, and rust inhibitor.

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