Flame-retardant anti-wear grease and preparation method thereof

Abstract

The present invention discloses a flame-retardant, anti-wear grease and a preparation method thereof. The grease comprises the following components by mass, based on 100% of the total mass of the grease: 20-40% hydrophilic polyether polyol, 20-50% melamine cyanurate, 5-10% solid lubricant, 1-3% antioxidant, 2-8% anti-wear agent, 1-3% corrosion inhibitor, with the balance being water. The antioxidant is at least one of octylated phenyl-α-naphthylamine and isooctyl ferulate. The resulting grease exhibits flame-retardant, anti-wear, and antioxidant properties, can prevent fires caused by high-temperature spontaneous combustion of the grease, and extend the service life of equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of lubricating grease, and more particularly to a flame retardant and anti-wear lubricating grease and a preparation method thereof. Background Art

[0002] Flame retardant materials are protective materials that can prevent combustion but are not easily burned themselves. They can effectively prevent and reduce the occurrence of fires and are therefore receiving increasing attention.

[0003] Grease is commonly used in various mechanical equipment as a lubricating and sealing material. Ordinary grease contains a large amount of mineral oil (the flash point of mineral oil is generally between 250 and 350°C), which is flammable under certain conditions. Once the equipment malfunctions, causing local continuous friction overheating, radiation overheating of peripheral equipment, or high-temperature objects splashing into the grease, the temperature will be higher than the natural point / ignition point of the grease, which will cause a fire.

[0004] In addition, with the development of modern industry and the continuous emergence of high-end precision equipment, the requirements for grease are becoming higher and higher, especially under high-speed and high-load operation conditions of equipment, which requires grease to have better wear resistance. However, current ordinary grease can no longer meet the load-bearing and anti-friction requirements required by mechanical equipment.

[0005] Therefore, it is urgent to improve the performance of grease and develop flame retardant and wear-resistant grease products. Summary of the Invention

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a flame-retardant and anti-wear grease and a preparation method thereof. The obtained grease has flame-retardant, anti-wear and antioxidant properties, can avoid the occurrence of fires caused by spontaneous combustion of grease, and extend the service life of equipment.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A flame-retardant anti-wear grease comprises the following components in mass fractions, based on 100% of the total mass of the grease: 20-40% of a hydrophilic polyether polyol, 20-50% of melamine cyanurate, 5-10% of a solid lubricant, 1-3% of an antioxidant, 2-8% of an anti-wear agent, 1-3% of a rust inhibitor, and the balance being water; the antioxidant is at least one of octylated phenyl-α-naphthylamine and isooctyl ferulate.

[0009] Furthermore, the hydrophilic polyether polyol is a polyoxyethylene-polyoxypropylene block copolymer using alcohol as an initiator.

[0010] Furthermore, the anti-wear agent is at least one of an extreme pressure anti-wear agent and a rare earth compound.

[0011] Furthermore, the extreme pressure anti-wear agent is at least one of cyclic metaborate and XP250 synthetic ester.

[0012] Furthermore, the rare earth compound is lanthanum diisooctylsuccinamate.

[0013] Furthermore, the solid lubricant is one of boron nitride and stearate.

[0014] Furthermore, the corrosion inhibitor is one of alkylnaphthalene sulfonate and carboxylate.

[0015] Furthermore, the grease includes the following components in mass fraction: 40% polyoxyethylene polyoxypropylene block copolymer, 31.5% melamine cyanurate, 6.1% boron nitride, 3% isooctyl ferulate, 5% XP250 synthetic ester, 2% lanthanum diisooctyl succinate, 2% barium dinonylnaphthalenesulfonate, and the balance is water.

[0016] A method for preparing a flame-retardant and wear-resistant grease comprises the following steps: uniformly mixing a hydrophilic polyether polyol and water at room temperature, heating the mixture to 50-60°C, adding melamine cyanurate and a solid lubricant, and uniformly stirring the mixture at a constant temperature of 50-60°C, adding an antioxidant, an anti-wear agent, and an anti-corrosion agent, and then grinding the mixture with a three-roll mill or uniformly dispersing the mixture with a homogenizer at 50-60°C, and finally cooling the mixture to room temperature and filtering the mixture to obtain a grease product.

[0017] The beneficial effects of the present invention are:

[0018] 1. The present invention uses melamine cyanurate (MCA) as a thickener and a halogen-free flame retardant, and compounded with other components to prepare a grease. The obtained grease has excellent flame retardant and anti-wear properties, avoids the occurrence of fires caused by spontaneous combustion or ignition of the grease, and effectively extends the service life of the equipment.

[0019] 2. The present invention preferably uses isooctyl ferulate as an antioxidant, XP250 synthetic ester as an extreme pressure anti-wear agent, and isooctyl metaborate as an anti-wear agent to compound the grease, utilizing the synergistic effect of isooctyl ferulate, XP250 synthetic ester, and isooctyl metaborate to further improve the antioxidant and anti-wear properties of the grease. DETAILED DESCRIPTION

[0020] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0021] The flame-retardant and wear-resistant grease of the present invention comprises the following components by mass fraction (based on 100% of the total mass of the grease): 20-40% hydrophilic polyether polyol, 20-50% melamine cyanurate, 5-10% solid lubricant, 1-3% antioxidant, 2-8% anti-wear agent, 1-3% anti-corrosion agent, and the balance is water.

[0022] Among them, the hydrophilic polyether polyol is preferably a polyoxyethylene polyoxypropylene block copolymer with alcohol as the initiator; the antioxidant is preferably at least one of octylated phenyl-α-naphthylamine and isooctyl ferulate; the anti-wear agent is at least one of an extreme pressure anti-wear agent and a rare earth compound, and the extreme pressure anti-wear agent is preferably at least one of a cyclic metaborate (such as isooctyl metaborate) and XP250 synthetic ester (purchased from Xipeng Environmental Protection Technology (Luoyang) Co., Ltd.), the rare earth compound is preferably lanthanum diisooctyl succinate, and the anti-wear agent is more preferably a combination of XP250 synthetic ester and lanthanum diisooctyl succinate; the solid lubricant is preferably one of boron nitride and stearate; the corrosion inhibitor is preferably one of alkylnaphthalene sulfonate (such as barium alkylnaphthalene sulfonate, calcium alkylnaphthalene sulfonate, etc.) and a carboxylate. Lanthanum diisooctyl succinate was prepared according to the method in the paper (Wang Zheng, Hu Litian. Synthesis of oil-soluble lanthanum carboxylate and study of its tribological properties [J]. Journal of Tribology, 2010, 30(2): 140-144).

[0023] Mix the hydrophilic polyether polyol and water evenly at room temperature, raise the temperature to 50-60°C, add melamine cyanurate and solid lubricant, stir evenly at a constant temperature (50-60°C), then add antioxidant, anti-wear agent, and anti-corrosion agent, then grind with a three-roll mill at 50-60°C or disperse evenly with a homogenizer, finally cool to room temperature, filter, and obtain a grease product.

[0024] The preferred embodiment is as follows:

[0025] Example 1

[0026] a. Prepare the following percentages of grease components: 40% hydrophilic polyether polyol (polyoxyethylene polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% octylated phenyl-α-naphthylamine, 7% isooctyl metaborate, 2% barium dinonylnaphthalenesulfonate, and the balance is water.

[0027] b. Mix the hydrophilic polyether polyol and water evenly at room temperature, raise the temperature to 55°C, add melamine cyanurate and solid lubricant and stir evenly at a constant temperature (55°C), then add antioxidant, anti-wear agent and anti-corrosion agent, and then disperse evenly through a homogenizer at 55°C. Finally, cool to room temperature and filter to obtain a grease product.

[0028] Example 2

[0029] A lubricating grease was prepared with the following percentages: 40% hydrophilic polyether polyol (polyoxyethylene-polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% 2-ethylhexyl ferulate, 5% XP250 synthetic ester, 2% lanthanum diisooctyl succinamate, 2% barium dinonylnaphthalenesulfonate, and the balance water. The lubricating grease was then prepared according to the method described in Example 1.

[0030] Example 3

[0031] A lubricating grease was prepared with the following percentages: 40% hydrophilic polyether polyol (polyoxyethylene-polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% 2-ethylhexyl ferulate, 5% XP250 synthetic ester, 2% barium dinonylnaphthalenesulfonate, and the balance water. The lubricating grease was then prepared according to the method described in Example 1.

[0032] Example 4

[0033] A lubricating grease was prepared with the following percentages: 40% hydrophilic polyether polyol (polyoxyethylene-polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% 2-ethylhexyl ferulate, 2% lanthanum diisooctyl succinamate, 2% barium dinonylnaphthalenesulfonate, and the balance water. The lubricating grease was then prepared according to the method described in Example 1.

[0034] Comparative Example 1

[0035] A lubricating grease was prepared with the following percentages: 40% hydrophilic polyether polyol (polyoxyethylene-polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 5% XP250 synthetic ester, 2% lanthanum diisooctylsuccinamate, 2% barium dinonylnaphthalenesulfonate, and the balance water. The lubricating grease was then prepared according to the method described in Example 1.

[0036] Example 5

[0037] A lubricating grease was prepared with the following percentages: 40% hydrophilic polyether polyol (polyoxyethylene-polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% octylated phenyl-α-naphthylamine, 5% XP250 synthetic ester, 2% lanthanum diisooctylsuccinamate, 2% barium dinonylnaphthalenesulfonate, and the balance water. The lubricating grease was then prepared according to the method described in Example 1.

[0038] Example 6

[0039] A lubricating grease was prepared with the following percentages: 40% hydrophilic polyether polyol (polyoxyethylene-polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% 2-ethylhexyl ferulate, 5% 2-ethylhexyl metaborate, 2% lanthanum diisooctyl succinamate, 2% barium dinonylnaphthalenesulfonate, and the balance water. The lubricating grease was then prepared according to the method described in Example 1.

[0040] Example 7

[0041] A lubricating grease was prepared with the following percentages: 40% hydrophilic polyether polyol (polyoxyethylene-polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% 2-ethylhexyl ferulate, 5% XP250 synthetic ester, 2% 2-ethylhexyl metaborate, 2% barium dinonylnaphthalenesulfonate, and the balance water. The lubricating grease was then prepared according to the method described in Example 1.

[0042] The performance tests were performed on the grease products prepared in Examples 1 to 7 and Comparative Example 1. The results are shown in Table 1.

[0043] Table 1

[0044]

[0045] It can be seen from Table 1 that the grease products prepared in each embodiment have good flame retardancy and anti-wear properties; by comparing Example 2 with Examples 3 to 7 and Comparative Example 1, it can be seen that when isooctyl ferulate, XP250 synthetic ester, and isooctyl metaborate are used, the grease products have better anti-wear and antioxidant properties, and isooctyl ferulate, XP250 synthetic ester, and isooctyl metaborate play a synergistic role.

[0046] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiment. All technical solutions based on the concept of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A flame retardant anti-wear grease, characterized in that: Based on 100% of the total mass of the grease, the grease includes the following components in mass fraction: 20-40% of hydrophilic polyether polyol, 20-50% of melamine cyanurate, 5-10% of solid lubricant, 1-3% of antioxidant, 2-8% of anti-wear agent, 1-3% of anti-corrosion agent, and the balance is water; the antioxidant is 2-ethylhexyl ferulate, and the anti-wear agent is XP250 synthetic ester and lanthanum diisooctyl succinamate.

2. The flame retardant anti-wear grease according to claim 1, characterized in that: The hydrophilic polyether polyol is a polyoxyethylene-polyoxypropylene block copolymer using alcohol as an initiator.

3. The flame retardant anti-wear grease according to claim 1, characterized in that: The solid lubricant is one of boron nitride and stearate.

4. The flame retardant anti-wear grease according to claim 1, characterized in that: The anti-corrosion agent is one of alkylnaphthalene sulfonate and carboxylate.

5. The flame retardant anti-wear grease according to claim 1, characterized in that: The grease comprises the following components by mass fraction: 40% polyoxyethylene polyoxypropylene block copolymer, 31.5% melamine cyanurate, 6.1% boron nitride, 3% isooctyl ferulate, 5% XP250 synthetic ester, 2% lanthanum diisooctyl succinate, 2% barium dinonylnaphthalenesulfonate, and the balance is water.

6. A method for preparing the flame retardant anti-wear grease according to any one of claims 1 to 5, characterized in that: The hydrophilic polyether polyol is mixed evenly with water at room temperature, and the temperature is raised to 50-60°C. Melamine cyanurate and solid lubricant are added and stirred evenly at a constant temperature of 50-60°C. An antioxidant, an anti-wear agent and an anti-corrosion agent are then added. The mixture is then ground with a three-roll mill or dispersed evenly with a homogenizer at 50-60°C. The mixture is finally cooled to room temperature and filtered to obtain a grease product.

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