CN115261102A

CN115261102A - Gear lubricating grease and preparation method and application thereof

Info

Publication number: CN115261102A
Application number: CN202210960464.1A
Authority: CN
Inventors: 杨国庆; 曹森科; 黄立福; 荣文博; 郑虹; 徐小芳; 沈毅; 程型国
Original assignee: Hangzhou Derunbao Oil Ltd By Share Ltd
Current assignee: Hangzhou Derunbao Oil Ltd By Share Ltd
Priority date: 2022-08-11
Filing date: 2022-08-11
Publication date: 2022-11-01

Abstract

The invention provides gear lubricating grease and a preparation method and application thereof, wherein the lubricating grease comprises 60-80 parts of base oil, 1-8 parts of thickening agent, 1-3 parts of antioxidant, 0.1-2 parts of antirust agent, 3-20 parts of tackifier and 5-20 parts of solid antiwear agent in parts by weight; the base oil comprises refined hydrogenated oil and/or synthetic hydrocarbon oil. The gear lubricating grease provided by the invention has the advantages of good wear resistance, good adhesion performance, good low-temperature performance, good stability and small oil distribution, and can effectively reduce the friction between a nylon gear and a metal gear.

Description

Gear lubricating grease and preparation method and application thereof

Technical Field

The invention belongs to the field of lubricating materials, and particularly relates to gear lubricating grease as well as a preparation method and application thereof, in particular to gear lubricating grease with good low-temperature performance as well as a preparation method and application thereof.

Background

With the rapid development of the electric automobile industry, the usage amount of the gear grease for the starting motor of the electric automobile is increased along with the increase of the inventory of the electric automobile. However, lubricating grease special for the starting motor gear is few, and most of the starting motor gear lubricating grease used in the market belongs to general products. These products have certain noise-reducing and wear-resisting properties, low-temperature properties and adhesive capacity. Because the low-temperature resistance of the lithium battery is poor, the starting motor gear lubricating grease only needs to have certain low-temperature performance, and the most important is the wear resistance. In order to achieve better antiwear properties, it is necessary to provide greases with strong adhesion capabilities. In the face of urgent needs of starting motor manufacturers, the starting motor gear lubricating grease with more excellent adhesion performance is developed, and the lubricating grease has important significance for reducing energy consumption and cost.

CN113403123A discloses open gear lubricating grease and a preparation method thereof, wherein the open gear lubricating grease is prepared from raw materials including base oil, a thickening agent and a structural auxiliary agent, the thickening agent comprises organic bentonite, the structural auxiliary agent comprises fumed silica, and the mass ratio of the organic bentonite to the fumed silica in the raw materials is (2-5): 1. The open gear lubricating grease is convenient to produce, easy to operate and high in production efficiency, avoids pollution of volatile organic auxiliaries to the environment in the production process, and improves the production safety. The open gear lubricating grease has good extreme pressure abrasion resistance, low-temperature fluidity, adhesion and antirust performance, and has excellent comprehensive performance.

CN103805325A discloses a gear grease formula, which comprises the following components by weight: 15-55% of mineral oil, 15-50% of synthetic oil, 2-5% of thickening agent, 0.2-0.8% of antioxidant, 5-20% of solid additive, 1-5% of antirust agent and 5-15% of antiwear extreme pressure agent; by adopting the gear lubricating grease formula provided by the invention, the friction of the gear in the transmission process is reduced, the external pollution medium is prevented from entering the gear meshing surface, the corrosion degree of the gear is reduced, the service life of the gear is prolonged, the low-temperature performance and the fluidity are improved, and the pollution to the environment is greatly reduced.

Because the performance requirements for the starting motor gear grease are stricter at present, how to provide the starting motor gear grease with good low-temperature performance and strong adhesion capability becomes a problem to be solved urgently.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide gear grease and a preparation method and application thereof, and particularly provides gear grease with good low-temperature performance and a preparation method and application thereof. The gear lubricating grease provided by the invention has the advantages of good abrasion resistance, good adhesion performance, good low-temperature performance, good stability and small oil distribution, and can effectively reduce the friction between a nylon gear and a metal gear.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides gear grease, which comprises, by weight, 60-80 parts of base oil, 1-8 parts of a thickening agent, 1-3 parts of an antioxidant, 0.1-2 parts of an antirust agent, 3-20 parts of a tackifier and 5-20 parts of a solid antiwear agent.

The base oil includes refined hydrogenated oil and/or synthetic hydrocarbon oil.

The base oil may be 60 parts, 65 parts, 70 parts, 75 parts or 80 parts, the thickener may be 1 part, 2 parts, 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts, the antioxidant may be 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts, the antirust may be 0.1 part, 0.5 part, 1 part, 1.5 parts or 2 parts, the tackifier may be 3 parts, 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts or 20 parts, the solid antiwear agent may be 5 parts, 7 parts, 9 parts, 11 parts, 13 parts, 15 parts, 17 parts or 20 parts, but the above-mentioned values are not limited thereto, and other values not listed in the above-mentioned value range are also applicable.

The lubricating grease adopts the compounding of the tackifier and the solid antiwear agent, and the synergistic effect obviously improves the adhesion performance of the product, ensures that the lubricating grease near the friction pair has higher lubrication degree with equipment, reduces the impact between the friction pair, reduces the abrasion, and prolongs the service life of the equipment; the components are matched and act together, so that the oil separation phenomenon of the product is obviously reduced, and the stability of the product is improved.

Preferably, the refined hydrogenated oil comprises a refined hydrogenated group II oil and/or a refined hydrogenated group III oil.

Preferably, the refined hydrogenated oil comprises any one of or a combination of at least two of 120BS base oil, 150BS base oil and fischer-tropsch synthesis base oil, such as 120BS base oil and 150BS base oil, 150BS base oil and fischer-tropsch synthesis base oil or 120BS base oil and fischer-tropsch synthesis base oil, but not limited to the above-listed combinations, and other combinations not listed within the above-mentioned combination range are also applicable.

Preferably, the synthetic hydrocarbon oil comprises a polyalphaolefin base oil (PAO).

Preferably, the thickener comprises octadecylamine, cyclohexylamine and diphenylmethane diisocyanate (MDI).

Preferably, the antioxidant comprises an amine antioxidant and/or a phenolic antioxidant.

Preferably, the amine antioxidant includes any one or a combination of at least two of octyl butyl diphenylamine, 4' -dioctyl diphenylamine or p-dioctyl diphenylamine, for example, a combination of octyl butyl diphenylamine and 4,4' -dioctyl diphenylamine, a combination of 4,4' -dioctyl diphenylamine and p-dioctyl diphenylamine, or a combination of octyl butyl diphenylamine and p-dioctyl diphenylamine, etc., but is not limited to the above-listed combinations, and other combinations not listed within the above-mentioned combination range are also applicable.

Preferably, the phenolic antioxidant comprises 2, 6-di-tert-butyl-p-methylphenol.

Preferably, the rust inhibitor comprises any one or a combination of at least two of medium-base synthetic calcium sulfonate, barium sulfonate or sodium sebacate, such as a combination of medium-base synthetic calcium sulfonate and barium sulfonate, a combination of barium sulfonate and sodium sebacate, or a combination of sodium sebacate and medium-base synthetic calcium sulfonate, but is not limited to the above-listed combinations, and other combinations not listed within the above-mentioned combination range are also applicable.

Preferably, the tackifier comprises any one or a combination of at least two of polyisobutylene, ethylene-propylene copolymer, polymethacrylate or hydrogenated styrene, such as a combination of polyisobutylene and ethylene-propylene copolymer, a combination of ethylene-propylene copolymer and hydrogenated styrene, or a combination of polymethacrylate and polyisobutylene, but not limited to the above-listed combinations, and other combinations not listed within the above-listed combinations are equally applicable, with a combination of polyisobutylene and hydrogenated styrene being preferred.

The specific tackifier can improve the adhesion performance of a product, can make effective balance between the adhesion performance and low-temperature performance, and further improves the effect of the tackifier in a preferable range.

Preferably, the solid antiwear agent comprises any one of or a combination of at least two of polytetrafluoroethylene, polyethylene wax or melamine cyanate, such as a combination of polytetrafluoroethylene and polyethylene wax, a combination of polytetrafluoroethylene and melamine cyanate, or a combination of polyethylene wax and melamine cyanate, and the like, but is not limited to the above-listed combinations, and other combinations not listed within the above-listed combinations are equally applicable, with a combination of polytetrafluoroethylene and melamine cyanate being preferred.

The specific solid antiwear agent can increase the impact load of a gear contact zone, and improve the extreme pressure performance and the antiwear performance; and the polytetrafluoroethylene and the melamine cyanate are compounded and have synergistic effect, so that the anti-wear effect of the product can be further improved.

In a second aspect, the present invention provides a method of preparing a gear grease as described above, the method comprising the steps of:

and mixing a thickening agent and base oil for reaction, adding a thickening agent, mixing and preserving heat, adding an antioxidant, an antirust agent and a solid antiwear agent, mixing and grinding to obtain the lubricating grease.

In a third aspect, the invention also provides the use of the gear grease as described above in the preparation of a starter motor gear grease.

Compared with the prior art, the invention has the following beneficial effects:

the gear lubricating grease provided by the invention has the advantages that the adhesion performance of the product is obviously improved by adopting the compounding of the tackifier and the solid antiwear agent and the synergistic effect, the lubricating grease near the friction pair is ensured to be higher in the lubricating degree of equipment, the impact between the friction pair is reduced, the abrasion is reduced, and the service life of the equipment is prolonged; the components are matched and act together, so that the oil separation phenomenon of the product is obviously reduced, and the stability of the product is improved; the adhesion performance of the product can be improved by adopting the specific tackifier, the adhesion performance and the low-temperature performance can be effectively balanced, and the effect of the tackifier is further improved within an optimal range; the impact load resistance of a gear contact area can be increased by adopting a specific solid antiwear agent, and the extreme pressure property and the antiwear property are improved; and the polytetrafluoroethylene and the melamine cyanate are compounded and have synergistic effect, so that the anti-wear effect of the product can be further improved.

Detailed Description

To further illustrate the technical means and effects of the present invention, the following further describes the technical solution of the present invention with reference to the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

In the following examples, refined hydrogenated group II oil was obtained from the ClarityI refinery, xinjiang, under the model number 150BS;

synthetic hydrocarbon oils were purchased from Mobil corporation, model PAO 40;

the medium-base-number synthetic calcium sulfonate is available from Yafudun corporation and has the model number of

614Drum；

Polyisobutylene, available from Jinzhou essential oil additives, type JINEX 6240;

hydrogenated styrene was obtained from Zhongli technology corporation under the model number W8533;

ethylene-propylene copolymer was purchased from luobutron, inc, model LZ7065C;

the polymethacrylate is purchased from Yingchun corporation and has the model number of

8-450；

The polytetrafluoroethylene micropowder is purchased from Santuo chemistry, and has the model number of ST 485;

the melamine cyanate is purchased from Hangzhou Jieisi flame retardant chemical company, and the model is MC 10;

polyethylene wax was purchased from triton chemistry, model No. ST 565.

Example 1

The embodiment provides gear grease, which comprises the following raw materials in parts by weight:

35 parts of refined hydrogenated II-type oil, 35 parts of synthetic hydrocarbon oil, 2.35 parts of primary octadecylamine, 1 part of cyclohexylamine, 3.35 parts of MDI and an amine antioxidant BASF

L57 (from BASF) 1 part, phenolic antioxidant BASF

1 part of L135 (from Basff), 1 part of medium-base synthetic calcium sulfonate, 10.3 parts of polyisobutylene, 5.2 parts of hydrogenated styrene, 5 parts of polytetrafluoroethylene micro powder and 5 parts of melamine cyanate.

The preparation method comprises the following steps:

adding part of refined hydrogenated II oil and synthetic hydrocarbon oil into a reaction kettle, adding MDI (diphenylmethane diisocyanate) and heating to 70 ℃; adding the rest refined hydrogenated II oil, the synthetic hydrocarbon oil, the octadecylamine and the cyclohexylamine into a melting tank, heating to 70 ℃, and then putting the mixture into a reaction kettle for reaction for 70min; then heating the reaction kettle to 120 ℃, adding polyisobutylene and hydrogenated styrene, grafting and heating to 180 ℃, and keeping the temperature for 40min; and then cooling to 80 ℃, adding the rest raw materials, stirring, taking out of the kettle, and grinding to obtain the lubricating grease.

Example 2

30 parts of refined hydrogenated II oil, 30 parts of synthetic hydrocarbon oil, 2.35 parts of octadecylamine, 1 part of cyclohexylamine, 3.35 parts of MDI and an amine antioxidant BASF

L57 (from Basf) 0.5 part, phenolic antioxidant BASF

0.5 part of L135 (from Basff), 0.1 part of medium-base-number synthetic calcium sulfonate, 1 part of polyisobutene, 2 parts of hydrogenated styrene, 2.5 parts of polytetrafluoroethylene micro powder and 2.5 parts of melamine cyanate.

The preparation process is referred to example 1.

Example 3

This example provides a gear grease, which comprises the following raw materials (by weight):

40 parts of refined hydrogenated II oil, 40 parts of synthetic hydrocarbon oil, 1.18 parts of octadecylamine, 0.5 part of cyclohexylamine, 2.68 parts of MDI and an amine antioxidant BASF

L57 (from Basff) 1 part, phenolic antioxidant BASF

1 part of L135 (from Basff), 2 parts of medium-base-number synthetic calcium sulfonate, 10 parts of polyisobutene, 10 parts of hydrogenated styrene, 10 parts of polytetrafluoroethylene micro powder and 10 parts of melamine cyanate.

The preparation process is referred to example 1.

Example 4

This example provides a gear grease having a composition identical to that of example 1 except that polyisobutylene is replaced by an equal amount of an ethylene-propylene copolymer.

The preparation process is referred to example 1.

Example 5

This example provides a gear grease having a composition identical to that of example 1 except that the hydrogenated styrene was replaced with an equivalent amount of polymethacrylate.

The preparation method refers to example 1.

Example 6

This example provides a gear grease having a composition identical to that of example 1 except that the hydrogenated styrene is replaced by an equal amount of polyisobutylene.

The preparation process is referred to example 1.

Example 7

This example provides a gear grease having a composition identical to that of example 1 except that polytetrafluoroethylene fine powder was replaced with an equal amount of melamine cyanate.

The preparation method refers to example 1.

Example 8

This example provides a gear grease having a composition identical to that of example 1 except that melamine cyanate was replaced with an equal amount of polytetrafluoroethylene fine powder.

The preparation process is referred to example 1.

Example 9

This example provides a gear grease having a composition identical to that of example 1 except that polytetrafluoroethylene fine powder was replaced with an equal amount of polyethylene wax.

The preparation process is referred to example 1.

Comparative example 1

This comparative example provides a gear grease having a composition identical to that of example 1 except that polyisobutylene and hydrogenated styrene were not added and the reduced portion was apportioned to polytetrafluoroethylene micropowder and melamine cyanate.

Comparative example 2

This comparative example provides a gear grease having a composition identical to that of example 1 except that no polytetrafluoroethylene powder and melamine cyanate were added, and the reduced portion was apportioned to polyisobutylene and hydrogenated styrene.

Comparative example 3

Certain commercially available starter motor gear greases.

And (3) testing the effect:

the greases provided in examples 1-9 and comparative examples 1-3 were tested and the results were as follows:

and bench test validation (15000 start-stops) was performed on the greases provided in example 1 and comparative examples 1-2, resulting in the grease provided in example 1 becoming grey in color and having a lighter wear track in one location on the nylon, while the grease provided in comparative examples 1-2 becoming black in color and having wear tracks in multiple locations on the nylon.

The results show that the gear lubricating grease provided by the invention has excellent stability, low-temperature performance and wear resistance; comparing example 1 with examples 4 to 6, it can be found that the invention can further improve the abrasion resistance of the product by adopting the specific tackifier on the basis of meeting the adhesion performance and low-temperature performance of the product; comparing the embodiment 1 with the embodiments 7-9, the invention can find that the anti-wear effect of the product can be further improved by adopting the compounding of the polytetrafluoroethylene and the melamine cyanate under the synergistic effect compared with other anti-wear agents; comparing the embodiment 1 with the comparative examples 1-2, the invention can find that the special tackifier and the solid antiwear agent are compounded, so that the antiwear effect of the product can be obviously improved, the abrasion is effectively reduced, and the service life of the equipment is prolonged; comparing example 1 with comparative example 3, it can be found that the product provided by the invention effectively improves the low temperature performance, the anti-wear effect, the adhesion performance and the stability compared with the existing product through the matching of the components.

The applicant states that the present invention is illustrated by the above examples of the gear grease of the present invention and the preparation method and application thereof, but the present invention is not limited to the above examples, i.e. it does not mean that the present invention must be implemented by the above examples. It should be understood by those skilled in the art that any modification of the present invention, equivalent substitutions of the raw materials of the product of the present invention, addition of auxiliary components, selection of specific modes, etc., are within the scope and disclosure of the present invention.

The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

Claims

1. The gear lubricating grease is characterized by comprising, by weight, 60-80 parts of base oil, 1-8 parts of a thickening agent, 1-3 parts of an antioxidant, 0.1-2 parts of an antirust agent, 3-20 parts of a tackifier and 5-20 parts of a solid antiwear agent;

2. The gear grease of claim 1 wherein the refined hydrogenated oil comprises a refined hydrogenated group II oil and/or a refined hydrogenated group III oil;

preferably, the refined hydrogenated oil comprises any one of or a combination of at least two of 120BS base oil, 150BS base oil or Fischer-Tropsch synthesis base oil;

preferably, the synthetic hydrocarbon oil comprises a polyalphaolefin base oil.

3. Gear grease according to claim 1 or 2, characterised in that the thickener comprises primary octadecylamine, cyclohexylamine and diphenylmethane diisocyanate.

4. Gear grease according to any one of claims 1-3 wherein the antioxidant comprises an aminic antioxidant and/or a phenolic antioxidant.

5. The gear grease of claim 4 wherein the amine antioxidant comprises any one or a combination of at least two of octyl butyl diphenylamine, 4' -dioctyl diphenylamine or p-dioctyl diphenylamine;

6. The gear grease of any one of claims 1-5 wherein the rust inhibitor comprises any one of or a combination of at least two of medium base synthetic calcium sulfonate, barium sulfonate, or sodium sebacate.

7. Gear grease according to any one of claims 1-6 characterised in that the viscosity increasing agent comprises any one of polyisobutylene, ethylene propylene copolymer, polymethacrylate or hydrogenated styrene or a combination of at least two thereof, preferably a combination of polyisobutylene and hydrogenated styrene.

8. Gear grease according to any one of claims 1-7 characterised in that the solid antiwear agent comprises any one of polytetrafluoroethylene, polyethylene wax or melamine cyanate or a combination of at least two thereof, preferably a combination of polytetrafluoroethylene and melamine cyanate.

9. A method of preparing a gear grease according to any one of claims 1-8, wherein the method of preparation comprises the steps of:

and mixing and reacting a thickening agent and base oil, adding a thickening agent, mixing, keeping the temperature, adding an antioxidant, an antirust agent and a solid antiwear agent, mixing and grinding to obtain the lubricating grease.

10. Use of a gear grease according to any one of claims 1-8 in the preparation of a starter motor gear grease.