A barium-based electric hammer cylinder lubricating grease composition and a method for preparing the same

Abstract

This invention provides a barium-based electric hammer cylinder lubricating grease composition and its preparation method. The lubricating grease composition comprises the following components in parts by weight: 35-60 parts base oil, 25-40 parts thickener, 0.5-3 parts antioxidant, 12-20 parts tackifier, and 2-8 parts extreme pressure anti-wear agent; the thickener is composed of barium hydroxide, dodecanoic acid, and dodecyl stearic acid. This invention addresses the characteristics of electric hammer cylinders during operation, including sliding friction, cyclic hammering, and long service life, by proposing a barium-based lubricating grease composition and its preparation method for electric hammer cylinders. This lubricating grease possesses suitable fluidity, excellent shear resistance, good leakage prevention, and extreme pressure anti-wear properties.

Description

Technical Field

[0001] This invention relates to the field of electric hammer cylinder lubricating grease, and more particularly to a barium-based electric hammer cylinder lubricating grease composition and its preparation method. Background Technology

[0002] In modern industry, lubricating greases are widely used. As industrialization continues to advance, there are increasingly higher requirements for the performance of lubricating greases. Barium-based lubricating grease compositions have excellent extreme pressure properties, anti-wear properties, high temperature properties, and shear resistance, which can better meet the requirements of various harsh conditions and have broad application prospects.

[0003] Because electric hammer cylinders operate under conditions of high vibration, high temperature, and high-frequency sliding friction during operation, the grease composition used in electric hammer cylinders needs to possess comprehensive properties such as suitable fluidity, excellent shear resistance, high temperature resistance, leak prevention, and extreme pressure anti-wear properties. Patent application CN105219503A discloses an electric hammer grease composition and its preparation method, which uses a dispersant to mix organic bentonite and base oil to form a grease structure, effectively reducing wear on gears and cylinders. However, this method still does not adequately meet the lubrication requirements of electric hammer cylinders.

[0004] Developing a grease that, while ensuring its general performance, achieves excellent overall performance for electric hammer cylinders through reasonable control of its formulation and preparation process is a pressing technical challenge in this field. Currently, there is an urgent need to provide a grease for electric hammer cylinders with excellent flowability, shear resistance, leakage prevention, and extreme pressure anti-wear properties. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a barium-based electric hammer cylinder lubricating grease composition and its preparation method. This invention addresses the characteristics of electric hammer cylinders during operation, including sliding friction, cyclic hammering, and long service life, by proposing a barium-based lubricating grease composition for use in electric hammer cylinders and its preparation method. This lubricating grease possesses suitable fluidity, excellent shear resistance, good leakage prevention, and extreme pressure anti-wear properties.

[0006] In a first aspect, the barium-based electric hammer cylinder lubricating grease composition provided by the present invention comprises the following components in parts by weight.

[0007] Base oil 35-60 parts.

[0008] Thickener 25-40 parts.

[0009] Antioxidant 0.5 to 3 parts.

[0010] 12-20 parts of thickener.

[0011] Extreme pressure anti-wear agent 2-8 parts.

[0012] The thickener is made from barium hydroxide, dodecanoic acid, and dodecyl stearic acid.

[0013] This invention provides a barium-based grease composition for use in electric hammer cylinders. This grease possesses suitable fluidity, excellent shear resistance, good leakage prevention, and extreme pressure anti-wear properties, effectively meeting the operating conditions of electric hammer cylinders, including sliding friction, cyclic hammering, and long service life. This invention, while ensuring its general performance, obtains a composite barium-based grease for electric hammer cylinders with excellent comprehensive performance through reasonable control of the grease's formulation and preparation process.

[0014] Preferably, the molar ratio of the dodecanoic acid to the dodecanoic acid is 1~5:2~15, more preferably 2:3~6, for example, molar ratios of 2:3, 2:3.1, 2:3.2, 2:3.3, 2:4, 2:5, etc.

[0015] In this invention, by optimizing the molar ratio of dodecanoic acid and dodecyl stearic acid, it is possible to improve high-temperature resistance while further enhancing shear resistance, and to significantly improve overall performance by working together with base oil and additives.

[0016] More preferably, the molar ratio of barium hydroxide, dodecanoic acid and dodecyl stearic acid is 3.5~4.5:2:3~5, preferably 3.6:2:3.2.

[0017] Preferably, the base oil is mineral oil A, mineral oil B, and polyalphaolefin synthetic oil, wherein the mass ratio of mineral oil A, mineral oil B, and polyalphaolefin synthetic oil is 6~8:6~8:5~8, and the viscosity of the base oil at 40°C is 145~180 mmHg. 2 / s, preferably 150~160 mm 2 / s.

[0018] Preferably, mineral oil A is 500SN, mineral oil B is HVI 650, and polyalphaolefin synthetic oil is PAO 40. Using the above-mentioned base oils and their proportions in this invention allows for better interaction with thickeners and additives, further improving the overall performance of the lubricating grease.

[0019] Preferably, the antioxidant is an oil-soluble aromatic amine.

[0020] More preferably, the antioxidant is the reaction product of N-phenylaniline and 2,4,4-trimethylpentene.

[0021] Preferably, the tackifier is an ethylene-propylene copolymer.

[0022] Further preferably, the tackifier is JINEX6130 (an ethylene-propylene copolymer product provided by Jinzhou Jinglian Company).

[0023] Preferably, the anti-wear agent is selected from one or more of molybdenum dialkyldithiocarbamate, zinc dialkyldithiophosphate, oil-soluble borate, and oil-soluble organic molybdenum.

[0024] Preferably, the anti-wear agent is molybdenum dialkyldithiocarbamate, zinc dialkyldithiophosphate, oil-soluble borate, or oil-soluble organic molybdenum.

[0025] Further preferably, the mass ratio of the molybdenum dialkyldithiocarbamate, zinc dialkyldithiophosphate, oil-soluble borate, and oil-soluble organic molybdenum is 1~3:0.5~1.5:0.5~1.5:0.5~1.5.

[0026] Preferably, the oil-soluble borate is amorphous microsphere potassium borate, and the oil-soluble organic molybdenum is dialkyl dithiophosphate molybdenum oxydiphosphate.

[0027] In this invention, based on specific thickeners and base oils, antioxidants, thickeners, and extreme pressure anti-wear agents are further optimized, which can give full play to the synergistic effect of each component in the system and help to further improve the overall performance of the lubricating grease composition.

[0028] Preferably, the barium-based electric hammer cylinder lubricating grease composition comprises the following components in parts by weight: Base oil 38-52 parts.

[0029] Thickener 30-40 parts.

[0030] Antioxidant 0.5~1.5 parts.

[0031] Thickening agent 13-17 parts.

[0032] 3-6 parts of extreme pressure anti-wear agent.

[0033] In this invention, the composition using the above-mentioned amounts of each component has better performance.

[0034] Secondly, the present invention provides a method for preparing the above-mentioned composite barium-based electric hammer cylinder lubricating grease composition, comprising the following steps: at a first temperature, mixing dodecyl stearic acid, dodecanoic acid and a portion of base oil; then adding a portion of an aqueous solution of barium hydroxide, and then heating to a second temperature for saponification reaction; using the remaining aqueous solution of barium hydroxide for alkali dripping; then heating to a third temperature for isothermal treatment; heating to a fourth temperature for isothermal treatment, then cooling to a fifth temperature and adding an antioxidant for isothermal treatment; cooling to a sixth temperature, adding the remaining base oil and a thickener; cooling to a seventh temperature, adding an extreme pressure anti-wear agent and performing post-treatment.

[0035] Preferably, the first temperature is 85-90°C; and / or, the second temperature is 95-100°C, and the saponification reaction time is 80-90 min; and / or, the alkali dripping time is 90-100 min; and / or, the third temperature is 130-140°C, and the isothermal reaction time at the fourth temperature is 30-40 min; and / or, the fourth temperature is 199-201°C, and the isothermal treatment at the fourth temperature is 3-5 min; and / or, the fifth temperature is 140-150°C, and the isothermal treatment at the fifth temperature is 3-5 min; and / or, the sixth temperature is 90-100°C; and / or, the seventh temperature is 50-60°C; and / or, the post-treatment includes homogenization, filtration, and degassing. Preferably, the amount of the partial base oil accounts for 55%-65% of the total base oil, and the amount of the partial barium hydroxide accounts for 60%-70% of the total barium hydroxide. This invention optimizes the formulation components and improves the preparation process, resulting in a grease composition with better performance prepared under preferred process and conditions.

[0036] The beneficial effects of this invention are at least as follows: The invention employs a unique composite metal soap-based high-temperature thickener, resulting in outstanding high-temperature resistance, extreme pressure, and anti-wear properties in the grease, effectively meeting the high-temperature, wear-resistant, leak-proof, and long-life performance requirements of electric hammer cylinders. A reasonable formula and suitable process conditions yield a uniform soap fiber structure, effectively reducing oil separation and providing excellent leak-proof properties. A balanced additive system ensures the prepared grease exhibits excellent extreme pressure, anti-wear, and adhesion properties. The electric hammer cylinder grease of this invention effectively prevents cylinder wear and oil leakage during operation, thus better meeting the lubrication requirements of electric hammer cylinders. The operating temperature range of this grease is -20~150℃. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this invention, not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0038] Unless otherwise stated, all raw materials and reagents used in the following examples are commercially available products or can be prepared by known methods. Where specific techniques or conditions are not specified in the examples, they are performed using conventional methods or in accordance with techniques or conditions described in the literature in this field, or according to the product instructions. Reagents and instruments whose manufacturers are not specified are all conventional products that can be purchased from legitimate channels.

[0039] Example 1 This embodiment provides a barium-based grease composition, which, based on a total weight of 100 parts, comprises: 35 parts thickener; 1 part antioxidant; 15 parts tackifier; 4.2 parts extreme pressure anti-wear agent; and the balance base oil.

[0040] The thickener is prepared from barium hydroxide, dodecanoic acid, and dodecyl stearic acid in a stoichiometric ratio, wherein the molar ratio of dodecanoic acid to dodecyl stearic acid is 2:3.2; the antioxidant is the reaction product of N-phenylaniline and 2,4,4-trimethylpentene (CAS: 68411-46-1); the tackifier is JINEX 6130; the extreme pressure anti-wear agent is molybdenum dialkyl dithiocarbamate (2 parts), zinc dialkyl dithiophosphate (1 part), potassium borate amorphous microspheres (0.2 parts), and molybdenum oxydialkyl dithiophosphate (1 part); and the base oil is 500SN, HVI650, and PAO40 in a weight ratio of 7:7:6.

[0041] This invention also provides a method for preparing the barium-based grease composition, specifically as follows: 60% of the total base oil is added to a reaction vessel, along with dodecyl stearic acid and dodecanoic acid. The temperature is raised to 87°C to completely dissolve the monocarboxylic acid in the base oil. Then, two-thirds of the barium hydroxide is dissolved in water, and the dissolved alkali solution is added to the reaction vessel to begin a saponification reaction for 85 minutes at a temperature of 97°C. The remaining one-third of the barium hydroxide is dissolved in water, and alkali is added dropwise to the reaction vessel for 95 minutes. After the alkali addition is complete, the temperature is raised to 135°C and maintained for 35 minutes for a composite reaction. After the temperature is maintained, the reaction vessel is raised to 200°C and maintained for 4 minutes. Then, the vessel is decanted and cooled to 145°C, and an antioxidant is added, maintaining the temperature for 35 minutes. The temperature is further lowered to below 100°C, and the grease consistency is adjusted with the remaining base oil, and a thickener is added. When the temperature drops below 60°C, an extreme pressure anti-wear agent is added, followed by homogenization, filtration, and degassing to obtain the finished grease.

[0042] Example 2 This embodiment provides a barium-based grease composition, which, based on a total weight of 100 parts, comprises: 30 parts thickener; 0.5 parts antioxidant; 13 parts tackifier; 3 parts extreme pressure anti-wear agent; and the balance base oil.

[0043] The thickener is prepared from barium hydroxide, dodecanoic acid, and dodecyl stearic acid in a stoichiometric ratio, wherein the molar ratio of dodecanoic acid to dodecyl stearic acid is 2:3; the antioxidant is the reaction product of N-phenylaniline and 2,4,4-trimethylpentene; the tackifier is JINEX 6130; the extreme pressure anti-wear agent is molybdenum dialkyl dithiocarbamate (2 parts), zinc dialkyl dithiophosphate (1 part), potassium borate amorphous microspheres (0.2 parts), and molybdenum oxydialkyl dithiophosphate (0.8 parts); and the base oil is 500SN, HVI650, and PAO40 in a weight ratio of 6:6:8.

[0044] This invention also provides a method for preparing the barium-based grease composition, specifically as follows: 55% of the total base oil is added to a reaction vessel, along with dodecyl stearic acid and dodecanoic acid. The temperature is raised to 85°C to completely dissolve the monocarboxylic acid in the base oil. Then, two-thirds of the barium hydroxide is dissolved in water, and the dissolved alkali solution is added to the reaction vessel to begin a saponification reaction for 80 minutes at a temperature of 95°C. The remaining one-third of the barium hydroxide is dissolved in water, and alkali is added dropwise to the reaction vessel for 90 minutes. After the alkali addition is complete, the temperature is raised to 130°C and maintained for 30 minutes for a composite reaction. After the temperature is maintained, the reaction vessel is raised to 199°C and maintained for 3 minutes. Then, the vessel is decanted and cooled to 140°C, and an antioxidant is added, maintaining the temperature for 30 minutes. The temperature is further lowered to below 100°C, and the grease consistency is adjusted with the remaining base oil, and a thickener is added. When the temperature drops below 60°C, an extreme pressure anti-wear agent is added, followed by homogenization, filtration, and degassing to obtain the finished grease.

[0045] Example 3 This embodiment provides a barium-based grease composition, which, based on a total weight of 100 parts, comprises: 40 parts thickener; 1.5 parts antioxidant; 17 parts tackifier; 6 parts extreme pressure anti-wear agent; and the balance base oil.

[0046] The thickener is prepared from barium hydroxide, dodecanoic acid, and dodecyl stearic acid in a stoichiometric ratio, wherein the molar ratio of dodecanoic acid to dodecyl stearic acid is 2:5; the antioxidant is the reaction product of N-phenylaniline and 2,4,4-trimethylpentene; the tackifier is JINEX 6130; the extreme pressure anti-wear agent is molybdenum dialkyl dithiocarbamate (2 parts), zinc dialkyl dithiophosphate (2 parts), potassium borate amorphous microspheres (0.2 parts), and molybdenum oxydialkyl dithiophosphate (1.8 parts); and the base oil is 500SN, HVI650, and PAO40 in a weight ratio of 8:8:5.

[0047] This invention also provides a method for preparing the barium-based grease composition, specifically as follows: 65% of the total base oil is added to a reaction vessel, along with dodecyl stearic acid and dodecanoic acid. The temperature is raised to 90°C to completely dissolve the monocarboxylic acid in the base oil. Then, two-thirds of the barium hydroxide is dissolved in water, and the dissolved alkali solution is added to the reaction vessel to begin a saponification reaction for 90 minutes at a temperature of 100°C. The remaining one-third of the barium hydroxide is dissolved in water, and alkali is added dropwise to the reaction vessel for 100 minutes. After the alkali addition is complete, the temperature is raised to 140°C and maintained for 40 minutes for a composite reaction. After the temperature is maintained, the reaction vessel is raised to 201°C and maintained for 5 minutes. Then, the vessel is decanted and cooled to 150°C, and an antioxidant is added, maintaining the temperature for 40 minutes. The temperature is further lowered to below 100°C, and the grease consistency is adjusted with the remaining base oil, and a thickener is added. When the temperature drops below 60°C, an extreme pressure anti-wear agent is added, followed by homogenization, filtration, and degassing to obtain the finished grease.

[0048] Comparative Example 1 This comparative example provides a barium-based grease composition, which, based on a total weight of 100 parts, comprises: 35 parts thickener; 1 part antioxidant; 15 parts tackifier; 4.2 parts extreme pressure anti-wear agent; and the balance base oil.

[0049] The thickener is prepared from barium hydroxide, dodecanoic acid, and dodecyl stearic acid in a stoichiometric ratio, wherein the molar ratio of dodecanoic acid to dodecyl stearic acid is 2:7; the antioxidant is the reaction product of N-phenylaniline and 2,4,4-trimethylpentene; the tackifier is JINEX 6130; the extreme pressure anti-wear agent is molybdenum dialkyl dithiocarbamate (2 parts), zinc dialkyl dithiophosphate (1 part), potassium borate amorphous microspheres (0.2 parts), and molybdenum oxydialkyl dithiophosphate (1 part); the base oil is 500SN, HVI650, and PAO40 in a weight ratio of 7:7:6.

[0050] This invention also provides a method for preparing the barium-based grease composition, specifically as follows: 60% of the total base oil is added to a reaction vessel, along with dodecyl stearic acid and dodecanoic acid. The temperature is raised to 87°C to completely dissolve the monocarboxylic acid in the base oil. Then, two-thirds of the barium hydroxide is dissolved in water, and the dissolved alkali solution is added to the reaction vessel to begin a saponification reaction for 85 minutes at a temperature of 97°C. The remaining one-third of the barium hydroxide is dissolved in water, and alkali is added dropwise to the reaction vessel for 95 minutes. After the alkali addition is complete, the temperature is raised to 135°C and maintained for 35 minutes for a composite reaction. After the temperature is maintained, the reaction vessel is raised to 200°C and maintained for 4 minutes. Then, the vessel is decanted and cooled to 145°C, and an antioxidant is added, maintaining the temperature for 35 minutes. The temperature is further lowered to below 100°C, and the grease consistency is adjusted with the remaining base oil, and a thickener is added. When the temperature drops below 60°C, an extreme pressure anti-wear agent is added, followed by homogenization, filtration, and degassing to obtain the finished grease.

[0051] Experimental Example 1 The greases obtained in Examples 1-3 and Comparative Example 1 were tested using the analytical and evaluation methods listed in Table 1.

[0052] The test performance data of Examples 1-3 and Comparative Example 1 are shown in Table 1.

[0053] Table 1 Performance data of Examples 1-3 and Comparative Example 1

[0054] From the comparison data of the above embodiments and comparative examples, it can be seen that: (1) the embodiments have excellent comprehensive performance such as high temperature resistance, shear resistance, and wear resistance; (2) the comparative examples have significantly poor high temperature resistance, barium soap thickening ability, and wear resistance; (3) the molar ratio of dodecanoic acid and dodecyl hydroxystearic acid should be controlled within a reasonable range, otherwise it will easily affect the comprehensive performance of the oil.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A barium-based electric hammer cylinder lubricating grease composition, characterized in that, Includes the following components in parts by weight: 35-60 parts base oil; Thickener 25-40 parts; Antioxidant 0.5-3 parts; 12-20 parts of tackifier; Extreme pressure anti-wear agent 2-8 parts; The thickener is made from barium hydroxide, dodecanoic acid, and dodecyl stearic acid.

2. The barium-based electric hammer cylinder lubricating grease composition according to claim 1, characterized in that, The molar ratio of the dodecanoic acid and the dodecanoic acid is 1~5:2~15; Preferably, the molar ratio of barium hydroxide, dodecanoic acid and dodecyl stearic acid is 3.5~4.5:2:3~5.

3. The barium-based electric hammer cylinder lubricating grease composition according to claim 1 or 2, characterized in that, The base oil is mineral oil A, mineral oil B, and polyalphaolefin synthetic oil, with a mass ratio of mineral oil A: mineral oil B: polyalphaolefin synthetic oil of 6~8:6~8:5~8. The viscosity of the base oil at 40°C is 145~180 mmHg. 2 / s, preferably 150~160 mm 2 / s; Preferably, mineral oil A is 500SN, mineral oil B is HVI650, and polyalphaolefin synthetic oil is PAO40.

4. The barium-based electric hammer cylinder lubricating grease composition according to any one of claims 1-3, characterized in that, The antioxidant is an oil-soluble aromatic amine; preferably, the antioxidant is the reaction product of N-phenylaniline and 2,4,4-trimethylpentene.

5. The barium-based electric hammer cylinder lubricating grease composition according to any one of claims 1-4, characterized in that, The tackifier is an ethylene-propylene copolymer; preferably, the tackifier is JINEX 6130.

6. The barium-based electric hammer cylinder lubricating grease composition according to any one of claims 1-5, characterized in that, The anti-wear agent is selected from one or more of the following: molybdenum dialkyldithiocarbamate, zinc dialkyldithiophosphate, oil-soluble borate, and oil-soluble organic molybdenum. Preferably, the anti-wear agent is molybdenum dialkyldithiocarbamate, zinc dialkyldithiophosphate, oil-soluble borate, and oil-soluble organic molybdenum; the mass ratio of molybdenum dialkyldithiocarbamate, zinc dialkyldithiophosphate, oil-soluble borate, and oil-soluble organic molybdenum is preferably 1~3:0.5~1.5:0.5~1.5:0.5~1.5; the oil-soluble borate is preferably amorphous microsphere potassium borate, and the oil-soluble organic molybdenum is preferably molybdenum oxydialkyldithiophosphate.

7. The barium-based electric hammer cylinder lubricating grease composition according to any one of claims 1-6, characterized in that, Includes the following components in parts by weight: 38-52 parts base oil; Thickener 30-40 parts; Antioxidant 0.5~1.5 parts; 13-17 parts of thickener; 3-6 parts of extreme pressure anti-wear agent.

8. A method for preparing the composite barium-based electric hammer cylinder lubricating grease composition according to any one of claims 1-7, characterized in that, Includes the following steps: At the first temperature, dodecyl stearic acid, dodecanoic acid, and a portion of the base oil are mixed; then, a portion of an aqueous solution of barium hydroxide is added, and the temperature is raised to the second temperature for saponification; the remaining aqueous solution of barium hydroxide is used for alkali dripping; then, the temperature is raised to the third temperature for isothermal treatment; the temperature is raised to the fourth temperature for isothermal treatment, then cooled to the fifth temperature and an antioxidant is added for isothermal treatment; the temperature is cooled to the sixth temperature, the remaining base oil and thickener are added; the temperature is cooled to the seventh temperature, an extreme pressure anti-wear agent is added, and post-treatment is performed.

9. The method for preparing the composite barium-based electric hammer cylinder lubricating grease composition according to claim 8, characterized in that, The first temperature is 85~90℃; and / or, the second temperature is 95~100℃, and the saponification reaction time is 80~90 min; and / or, the alkali dripping time is 90~100 min; and / or, the third temperature is 130~140℃, and the reaction time at the fourth temperature is 30~40 min; and / or, the fourth temperature is 199~201℃, and the treatment at the fourth temperature is 3~5 min; and / or, the fifth temperature is 140~150℃, and the treatment at the fifth temperature is 3~5 min; and / or, the sixth temperature is 90~100℃; and / or, the seventh temperature is 50~60℃; and / or, the post-treatment includes homogenization, filtration, and degassing.

10. The method for preparing the composite barium-based electric hammer cylinder lubricating grease composition according to claim 8 or 9, characterized in that, The amount of the base oil constitutes 55% to 65% of the total base oil, and the amount of the barium hydroxide constitutes 60% to 70% of the total barium hydroxide.

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