Flame-retardant wear-resistant lubricating grease and preparation method thereof

Abstract

The invention discloses flame-retardant wear-resistant lubricating grease and a preparation method thereof, and the lubricating grease comprises the following components in percentage by mass based on 100% of the total mass of the lubricating grease: 20-40% of 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 an anti-rust agent and the balance of water. The antioxidant is at least one of octyl phenyl-alpha-naphthylamine and iso-octyl ferulate. The lubricating grease has flame-retardant, wear-resistant and oxidation-resistant properties, can avoid fire hazards caused by high-temperature spontaneous combustion of the lubricating grease, and prolongs the service life of equipment.

Description

Technical Field

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

[0002] Flame retardant material is a protective material that can prevent combustion but is not easy to burn itself. It can effectively prevent and reduce the occurrence of fires and is therefore receiving more and more 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 and causes local and 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, the current ordinary grease can no longer meet the load-bearing and anti-friction requirements of 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 the equipment.

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

[0008] A flame retardant and anti-wear grease, which comprises the following components in mass fraction based on 100% of the total mass of the grease: 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 rust inhibitor, and the balance is 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 diisooctylsuccinate.

[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 comprises 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 dinonylnaphthalene sulfonate, 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, stirring the mixture uniformly at a constant temperature of 50-60°C, adding an antioxidant, an anti-wear agent, and an anti-corrosion agent, grinding the mixture with a three-roll mill or uniformly dispersing the mixture with a homogenizer at 50-60°C, 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 to prepare grease in combination with other components. 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 prolongs 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, and utilizes 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 technical solutions in the embodiments of the present invention are described clearly and completely below. 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 creative work 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 in mass fraction (based on 100% of the total mass of the grease): 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 rust inhibitor, 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 an 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] The hydrophilic polyether polyol is mixed with water at room temperature, and the temperature is raised to 50-60°C. After adding melamine cyanurate and solid lubricant and stirring at a constant temperature (50-60°C), an antioxidant, an anti-wear agent and an anti-rust agent are added. The mixture is then ground with a three-roll mill or dispersed evenly with a homogenizer at 50-60°C. Finally, the mixture is cooled to room temperature and filtered to obtain a grease product.

[0024] The preferred embodiments are 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. Evenly mix the hydrophilic polyether polyol and water 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, then disperse evenly through a homogenizer at 55°C, finally cool to room temperature, filter and obtain a grease product.

[0028] Example 2

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

[0030] Example 3

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

[0032] Example 4

[0033] The following percentages of lubricating grease components were prepared: 40% hydrophilic polyether polyol (polyoxyethylene polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% isooctyl ferulate, 2% lanthanum diisooctyl succinamide, 2% barium dinonylnaphthalene sulfonate, and the balance was water. The lubricating grease product was then prepared according to the method described in Example 1.

[0034] Comparative Example 1

[0035] The following percentages of lubricating grease components were prepared: 40% hydrophilic polyether polyol (polyoxyethylene polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 5% XP250 synthetic ester, 2% lanthanum diisooctyl succinamide acid, 2% barium dinonylnaphthalene sulfonate, and the balance was water. The lubricating grease product was then prepared according to the method described in Example 1.

[0036] Example 5

[0037] The following percentages of lubricating grease components were prepared: 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 diisooctyl succinamide, 2% barium dinonylnaphthalene sulfonate, and the balance was water. The lubricating grease product was then prepared according to the method described in Example 1.

[0038] Example 6

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

[0040] Example 7

[0041] The following percentages of lubricating grease components were prepared: 40% hydrophilic polyether polyol (polyoxyethylene polyoxypropylene block copolymer), 31.5% melamine cyanurate, 6.1% boron nitride, 3% isooctyl ferulate, 5% XP250 synthetic ester, 2% isooctyl metaborate, 2% barium dinonylnaphthalenesulfonate, and the balance was water. The lubricating grease product 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 Example 3-Example 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 is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A flame retardant and anti-wear grease, characterized in that: Based on 100% of the total mass of the grease, the grease includes the following components in mass fractions: 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 rust inhibitor, and the balance is water; the antioxidant is at least one of octylated phenyl-α-naphthylamine and isooctyl ferulate.

2. The flame retardant and 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 and anti-wear grease according to claim 1, characterized in that: The anti-wear agent is at least one of an extreme pressure anti-wear agent and a rare earth compound.

4. The flame retardant and anti-wear grease according to claim 3, characterized in that: The extreme pressure anti-wear agent is at least one of cyclic metaborate and XP250 synthetic ester.

5. The flame retardant and anti-wear grease according to claim 3, characterized in that: The rare earth compound is lanthanum diisooctyl succinate.

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

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

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

9. A method for preparing the flame retardant and wear resistant grease according to any one of claims 1 to 8, 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. Antioxidants, antiwear agents and anti-corrosion agents 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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