CN111849590B - Low-noise mixed soap-based lubricating grease composition and preparation method thereof - Google Patents
Low-noise mixed soap-based lubricating grease composition and preparation method thereof Download PDFInfo
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- CN111849590B CN111849590B CN202010566421.6A CN202010566421A CN111849590B CN 111849590 B CN111849590 B CN 111849590B CN 202010566421 A CN202010566421 A CN 202010566421A CN 111849590 B CN111849590 B CN 111849590B
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M169/00—Lubricating compositions characterised by containing as components a mixture of at least two types of ingredient selected from base-materials, thickeners or additives, covered by the preceding groups, each of these compounds being essential
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/10—Petroleum or coal fractions, e.g. tars, solvents, bitumen
- C10M2203/1006—Petroleum or coal fractions, e.g. tars, solvents, bitumen used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2205/00—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions
- C10M2205/02—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers
- C10M2205/0206—Organic macromolecular hydrocarbon compounds or fractions, whether or not modified by oxidation as ingredients in lubricant compositions containing acyclic monomers used as base material
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/02—Hydroxy compounds
- C10M2207/023—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings
- C10M2207/026—Hydroxy compounds having hydroxy groups bound to carbon atoms of six-membered aromatic rings with tertiary alkyl groups
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/126—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic
- C10M2207/1265—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids monocarboxylic used as thickening agent
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/10—Carboxylix acids; Neutral salts thereof
- C10M2207/12—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
- C10M2207/125—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids
- C10M2207/128—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof
- C10M2207/1285—Carboxylix acids; Neutral salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having hydrocarbon chains of eight up to twenty-nine carbon atoms, i.e. fatty acids containing hydroxy groups; Ethers thereof used as thickening agents
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2207/00—Organic non-macromolecular hydrocarbon compounds containing hydrogen, carbon and oxygen as ingredients in lubricant compositions
- C10M2207/40—Fatty vegetable or animal oils
- C10M2207/402—Castor oils
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant Compositions
- C10M2215/22—Heterocyclic nitrogen compounds
- C10M2215/223—Five-membered rings containing nitrogen and carbon only
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/04—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions containing sulfur-to-oxygen bonds, i.e. sulfones, sulfoxides
- C10M2219/044—Sulfonic acids, Derivatives thereof, e.g. neutral salts
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/041—Triaryl phosphates
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
- C10M2223/00—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions
- C10M2223/02—Organic non-macromolecular compounds containing phosphorus as ingredients in lubricant compositions having no phosphorus-to-carbon bonds
- C10M2223/04—Phosphate esters
- C10M2223/045—Metal containing thio derivatives
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- Chemical & Material Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
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Abstract
The invention relates to a low-noise mixed soap-based lubricating grease composition and a preparation method thereof, wherein the low-noise mixed soap-based lubricating grease composition comprises the following components in percentage by weight: 78-87% of base oil; 9-15% of a thickening agent; 2.0-3.0% of an antiwear agent; 1.0-2.0% of an antirust agent; 1.0-2.0% of an antioxidant; the base oil is selected from one or more of mineral oil, ether oil or poly-alpha olefin synthetic oil; the thickening agent is a product obtained by reacting fatty acid with lithium hydroxide and potassium hydroxide. Compared with lithium-based lubricating grease, the low-noise mixed soap-based lubricating grease provided by the invention has a shorter and more uniform fiber structure, effectively reduces the collision of the balls and the retainer along the radial direction of the bearing, and has an obvious vibration reduction effect. The obtained product can be applied to the environment below minus 30 ℃, and has longer service life of the bearing and protection effect. The preparation method has the advantage of energy conservation, can ensure the shortness, the uniformity and the shortness of the fiber, and has simple process and stable product quality.
Description
Technical Field
The invention relates to the technical field of lubricating grease, in particular to a low-noise mixed soap-based lubricating grease composition and a preparation method thereof.
Background
The lubricating grease is a shaping lubricant consisting of a thickening agent, base oil and an additive, and has a semi-fluid characteristic. The thickener is dispersed in the base oil, and the additive has the function of improving the relevant performance of the lubricating grease. The yield and usage of grease is much lower than that of lubricating oil, but the kind of grease and its role in industry and life are not inferior to that of lubricating oil at all. Firstly, the lubricating grease can be applied to a sealed environment, so that the consumption of the lubricating agent can be reduced, and the maintenance cost is reduced; the lubricating grease has a certain structure, is not easy to run off, and can simplify the design of a lubricating system; the lubricating grease can be suitable for harsh operating conditions, such as high-temperature, low-speed and high-load working conditions.
The typical component most widely used by the mechanical industry for grease is a rolling bearing. At present, more than 80% of rolling bearings are lubricated and protected by lubricating grease. With the continuous progress of science and technology, the manufacturing precision of the low-noise bearing is greatly improved along with the progress of the bearing manufacturing technology, when the processing precision reaches a certain level, the noise generated by the low-noise bearing is smaller and smaller, and at the moment, the lubricating grease has more and more important function on reducing the running noise of the bearing. At present, about 80% of rolling bearings are lubricated with grease, which is considered as the fifth largest "element" indispensable behind the bearing inner ring, outer ring, rolling elements and cage, and thus the grease is becoming a major factor affecting bearing noise.
Lithium grease is used in the largest amount in the bearing industry, accounting for about seventy percent of the total grease. As the lubricating grease adopts the lithium soap which is soft and easy to filter as the thickening agent and the mineral oil as the base oil, the requirement of reducing the vibration value of the medium and low-grade bearing can be easily met. However, customers have higher requirements on the service life, the antirust performance and the low-temperature performance of bearing lubricating grease, most lubricating grease manufacturers adopt composite lithium-based lubricating grease, the high-temperature performance of the composite lithium-based lubricating grease is better, the service life of the composite lithium-based lubricating grease is prolonged compared with that of the lithium-based lubricating grease, but the hardness of fibers of the composite lithium-based lubricating grease is greatly increased due to the addition of low-molecular acid in the crystallization of a thickening agent, the composite lithium-based lubricating grease has poorer vibration performance in bearings, and particularly, the composite lithium-based lubricating grease cannot achieve good noise reduction effect in small and medium-sized and miniature precision bearings.
CN102021069A discloses a preparation method of lithium-based low-noise lubricating grease, wherein the lubricating grease has good vibration noise reduction performance, the vibration value can be reduced by 2-5 decibel values, indexes such as high-temperature performance and low-temperature performance reach a better index range, and a finished product of the lubricating grease also has a transparent appearance. CN103525512A discloses a preparation method of a high-temperature long-life low-noise lithium-based lubricating grease, which adopts deeply refined mineral oil, ester oil and olefin synthetic oil to thicken a composite lithium soap; the lubricating grease is added into a 6201 bearing by adopting a special quenching process and a proper antioxidant system, and the vibration decibel value reaches about 25. CN110669567A discloses a preparation method of a low-noise long-life composite barium-based grease, which adopts PAO, mineral oil, ester oil, and polyol ester thickened composite barium soap to solve the technical problems of noise and difficult achievement of a longer service life of the existing composite barium-based grease to a certain extent. CN105419919A discloses a preparation method of a low-noise polyurea lubricating grease, and the prepared polyurea lubricating grease has a good and stable vibration value.
With the improvement of the industrial technology level, the noise level of the lubricating grease is evaluated by Be Quiet + and More Quiet noise testers of household appliances, electronic equipment, office equipment, automobiles, precision instruments, some military equipment and the like, and the low-noise lubricating grease cannot reach the highest noise level. Therefore, there is a need to develop a low-noise grease product for small and medium-sized and miniature precision bearing lubrication.
Disclosure of Invention
Aiming at the defects and shortcomings in the prior art, the invention provides a low-noise mixed soap-based lubricating grease composition and a preparation method thereof.
One of the purposes of the invention is to provide a low-noise mixed soap-based lubricating grease composition, which comprises the following components in percentage by weight:
the base oil is selected from one or more of mineral oil, ether oil or poly-alpha olefin synthetic oil; the thickening agent is a product obtained by reacting fatty acid with lithium hydroxide and potassium hydroxide.
According to the invention, the lithium-potassium fatty acid soap is selected, so that the lubricating grease has a shorter and more uniform fiber structure compared with lithium-based lubricating grease, the collision of the ball and the retainer along the radial direction of the bearing is effectively reduced, and the vibration reduction effect is obvious. The base oil with excellent low-temperature performance is selected, and the proper antirust agent, the anti-wear agent and the antioxidant are added, so that the product can be applied to the environment below-30 ℃, and has longer service life and protection effect.
According to some preferred embodiments of the present invention, the thickener is a reaction product of dodecahydroxystearic acid, stearic acid, or hydrogenated castor oil with lithium hydroxide monohydrate and potassium hydroxide.
According to some preferred embodiments of the present invention, the mass ratio of the lithium hydroxide monohydrate to the potassium hydroxide in the thickening agent is 1:1 to 9: 1.
According to some preferred embodiments of the invention, the base oil has a congealing point of not more than-25 ℃, preferably-30 to 50 ℃.
According to some preferred embodiments of the present invention, the base oil has a viscosity of 70 to 150mm at 40 ℃2Preferably 70 to 100 mm/s2/s。
In the present invention, a preferred kind of base oil is mineral oil or polyalphaolefin synthetic oil.
According to some preferred embodiments of the invention, the antiwear agent is a dialkyl dithiophosphate or a phosphate ester, preferably a dialkyl dithiophosphate.
According to some preferred embodiments of the present invention, the rust inhibitor is a sulfonate compound or benzotriazole, preferably a sulfonate compound.
According to some preferred embodiments of the invention, the antioxidant is an aminic antioxidant or a phenolic antioxidant, preferably a phenolic antioxidant.
According to some preferred embodiments of the invention, the composition is formulated as:
the base oil is mineral oil and poly-alpha-olefin synthetic oil, and the mass ratio of the mineral oil to the poly-alpha-olefin synthetic oil is 1:1, the thickening agent is a lithium-potassium mixed soap, the mass ratio of lithium hydroxide monohydrate to potassium hydroxide is 1.75:1, the antiwear agent is dialkyl dithiophosphate, the preservative is a sulfonate compound, and the antioxidant is a phenol antioxidant.
Another object of the present invention is to provide a method for preparing the low-noise mixed soap-based grease composition, comprising the steps of: adding fatty acid into 1/2 base oil, mixing and heating to 85-95 ℃, adding an aqueous solution of lithium hydroxide monohydrate and potassium hydroxide after the fatty acid is dissolved, and carrying out saponification reaction for 1.0-1.5 h; then heating to 130-140 ℃, keeping the temperature for 20-30 min, draining water, heating to 195-210 ℃, adding the rest base oil, stirring for 5min, taking out, quenching and cooling, and controlling the quenching temperature to be 130-160 ℃; and then, continuously cooling to 90-100 ℃, sequentially adding an antiwear agent, an antirust agent and an antioxidant, and dispersing to obtain the anti-wear antirust agent.
In the invention, in terms of process, the highest refining temperature of the product is relatively low, the quenching temperature is controlled to be 130-160 ℃, energy is saved, the shortness and the uniformity of fibers are ensured, the preparation method is simple in process, and the product quality is relatively stable. The lubricating grease with excellent mute level, long service life and good protective performance is prepared by thickening the base oil with excellent low-temperature performance by using the lithium fatty acid potassium soap and a special quenching process.
The invention has the beneficial effects that: compared with lithium-based lubricating grease, the low-noise mixed soap-based lubricating grease provided by the invention has a more short and uniform fiber structure, effectively reduces the collision of balls and a retainer along the radial direction of a bearing, and has an obvious vibration reduction effect. The obtained product can be applied to the environment below minus 30 ℃, has excellent mechanical stability, colloid stability and wear resistance, and has longer service life and protective effect of the bearing. The preparation method has the advantage of energy conservation, can ensure the shortness, the uniformity and the shortness of the fiber, and has simple process and stable product quality. The low-noise mixed soap-based lubricating grease disclosed by the invention can Be widely applied to the fields of household appliances, electronic equipment, office equipment, automobiles, precision instruments, some military equipment and the like, meets the requirements of small and medium-sized and miniature precision bearings on lubrication, and can reach the highest noise level by testing and evaluating through Be Quiet + and More Quiet noise testers.
Detailed Description
The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention. The examples do not show the specific techniques or conditions, according to the technical or conditions described in the literature in the field, or according to the product specifications.
In the present invention, the equipment and the like used are conventional products which are available from normal vendors, and which are not indicated by manufacturers. The raw materials used in the invention can be conveniently bought in domestic product markets.
Example 1
The components of this example are based on the total weight of the composition:
(1) 87% of base oil;
(2) 8% of a thickening agent;
(3) 2% of an antiwear agent;
(4) 1% of antirust agent;
(5) 2 percent of antioxidant.
Adding dodecahydroxystearic acid into 1/2 base oil (ether oil and synthetic oil at a mass ratio of 1:2, and base oil viscosity of 80 mm)2The flow point is minus 40 ℃), mixing and heating to 85 ℃, adding aqueous solution of lithium hydroxide monohydrate and potassium hydroxide (mass ratio is 9:1) after the fatty acid is dissolved, and carrying out saponification reaction for 1.5 hours; after the reaction is finished, the temperature is raised to 130 ℃, the temperature is kept constant for 30 minutes, water is discharged, after the water discharge is finished, the temperature is raised to the maximum temperature of 210 ℃, then the residual base oil is added, the mixture is stirred for five minutes, the mixture is taken out and rapidly cooled, and the quenching temperature is controlled to be 160 ℃. And continuously cooling to 90 ℃, and sequentially adding an antiwear agent zinc dialkyl dithiophosphate, an antirust agent barium dinonyl naphthalenesulfonate and an amine antioxidant. And dispersing the lubricating grease by a three-roller machine and filling. The properties of the grease prepared by the formulation process of this example are shown in Table 1:
table 1 grease properties of example 1
As can be seen from table 1, the grease of the present embodiment has the performance characteristics of better silencing performance, shear stability, water resistance, colloid stability, wear resistance, rust protection, corrosion resistance, longer high temperature bearing life, and the like.
Example 2
The components of this example are based on the total weight of the composition:
(1) 78% of base oil;
(2) 15% of a thickening agent;
(3) 3% of an antiwear agent;
(4) 2% of an antirust agent;
(5) 2 percent of antioxidant.
Adding dodecahydroxystearic acid and stearic acid (mass ratio of 4:1) into 1/2 base oil (mineral oil and synthetic oil, mass ratio of 2:1, base oil viscosity of 70mm2Mixing and heating to 90 ℃ in the temperature of minus 30 ℃ per second, dissolving the fatty acid, adding aqueous solution of lithium hydroxide monohydrate and potassium hydroxide (mass ratio is 1:1), and performing saponification for 1.0 hour; after the reaction is finished, heating to 120 ℃, keeping the temperature for 30 minutes for draining, after the draining is finished, heating to the maximum temperature of 190 ℃, then adding the residual base oil, stirring for five minutes, taking out and rapidly cooling, and controlling the quenching temperature to 135 ℃. And continuously cooling to 95 ℃, and sequentially adding an antiwear agent tricresyl phosphate, an antirust agent barium dinonylnaphthalenesulfonate and an antioxidant 2, 6-di-tert-butyl-p-cresol. And dispersing the lubricating grease by a three-roller machine and filling. The properties of the greases produced by the formulation process of this example are listed in table 2:
table 2 grease properties of example 2
As can be seen from table 2, the grease of the present embodiment has the performance characteristics of better silencing performance, shear stability, water resistance, colloid stability, wear resistance, rust protection, corrosion resistance, longer high temperature bearing life, and the like.
Example 3
The components of this example are based on the total weight of the composition:
(1) 83% of base oil;
(2) 12% of a thickening agent;
(3) 2% of an antiwear agent;
(4) 1% of antirust agent;
(5) 2 percent of antioxidant.
Adding dodecahydroxystearic acid and hydrogenated castor oil (mass ratio of 3:2) into 1/2 base oil (mineral oil and ether oil, mass ratio of 5:1, base oil viscosity of 100mm2Mixing and heating to 87 ℃ in the temperature of minus 35 ℃ per second, dissolving the fatty acid, adding aqueous solution of lithium hydroxide monohydrate and potassium hydroxide (mass ratio is 2:1), and performing saponification reaction for 1.5 hours; and after the reaction is finished, heating to 130 ℃, keeping the temperature for 20 minutes for draining, heating to 205 ℃ of the maximum temperature after draining is finished, then adding the residual base oil, stirring for five minutes, taking out the base oil, rapidly cooling, and controlling the quenching temperature to 145 ℃. And continuously cooling to 95 ℃, and sequentially adding the zinc dialkyl dithiophosphate as an antiwear agent, benzotriazole as a preservative and an amine antioxidant. And dispersing the lubricating grease by a three-roller machine and filling. The properties of the greases produced by the formulation process of this example are listed in table 3:
table 3 grease properties of example 3
As can be seen from table 3, the grease of the present embodiment has the performance characteristics of better silencing performance, shear stability, water resistance, colloid stability, wear resistance, rust protection, corrosion resistance, longer high temperature bearing life, and the like.
Example 4
The components of this example are based on the total weight of the composition:
(1) 83% of base oil;
(2) 10% of a thickening agent;
(3) 3% of an antiwear agent;
(4) 2% of an antirust agent;
(5) 2 percent of antioxidant.
Adding dodecahydroxystearic acid, stearic acid, and hydrogenated castor oil (mass ratio of 3:1:1) into 1/2 base oil (synthetic oil, base oil viscosity of 120 mm)2In the temperature of minus 45 ℃ per second, the mixture is heated to 85 ℃, after the fatty acid is dissolved, the aqueous solution of lithium hydroxide monohydrate and potassium hydroxide (mass ratio is 5:1) is added, and the saponification reaction is carried out for 1.5 hours; after the reaction is finished, the temperature is raised to 130 ℃, the temperature is kept constant for 30 minutes, water is discharged, after the water discharge is finished, the temperature is raised to the highest temperature of 207 ℃, then the residual base oil is added, the mixture is stirred for five minutes, the mixture is taken out and rapidly cooled, and the quenching temperature is controlled to be 140 ℃. And continuously cooling to 95 ℃, and sequentially adding an antiwear agent, namely tricresyl phosphate, an antirust agent, namely barium dinonylnaphthalenesulfonate and an antioxidant, namely 2, 6-di-tert-butyl-p-cresol. And dispersing the lubricating grease by a three-roller machine and filling. The properties of the greases produced by the formulation process of this example are listed in table 4:
table 4 grease properties of example 4
As can be seen from table 4, the grease of the present embodiment has the performance characteristics of better silencing performance, shear stability, water resistance, colloid stability, wear resistance, rust protection, corrosion resistance, longer high temperature bearing life, and the like.
Example 5
The components of this example are, by weight of the total composition:
(1) 84% of base oil;
(2) 10% of a thickening agent;
(3) 2% of an antiwear agent;
(4) 2% of antirust agent;
(5) 2 percent of antioxidant.
Adding dodecahydroxystearic acid into 1/2 base oil (synthetic oil and ether oil, mass ratio is 6:1, and base oil viscosity is 150mm2At a pour point of-45 ℃ in the presence of water, mixing and heatingAfter the temperature is up to 90 ℃, dissolving the fatty acid, adding an aqueous solution of lithium hydroxide monohydrate and potassium hydroxide (mass ratio is 6:1), and carrying out saponification reaction for 1.3 hours; after the reaction is finished, the temperature is raised to 130 ℃, the temperature is kept constant for 30 minutes, water is discharged, after the water discharge is finished, the temperature is raised to the maximum temperature of 210 ℃, then the residual base oil is added, the mixture is stirred for five minutes, the mixture is taken out and rapidly cooled, and the quenching temperature is controlled to be 150 ℃. And continuously cooling to 90 ℃, and sequentially adding an antiwear agent zinc dialkyl dithiophosphate, a preservative benzotriazole and an amine antioxidant. And dispersing the lubricating grease by a three-roller machine and filling. The properties of the greases produced by the formulation process of this example are listed in table 5:
table 5 grease properties of example 5
As can be seen from table 5, the grease of the present embodiment has the performance characteristics of better silencing performance, shear stability, water resistance, colloid stability, wear resistance, rust protection, corrosion resistance, longer high temperature bearing life, and the like.
Example 6
The components of this example are, by weight of the total composition:
(1) 83% of base oil;
(2) 13% of a thickening agent;
(3) 2% of an antiwear agent;
(4) 1% of antirust agent;
(5) 1% of antioxidant.
Adding dodecahydroxystearic acid into 1/2 base oil (synthetic oil and ether oil, mass ratio is 6:1, and base oil viscosity is 150mm2At a pour point of-45 ℃ C.), mixing and heating to 85 ℃. After the fatty acid is dissolved, adding an aqueous solution of lithium hydroxide monohydrate and potassium hydroxide (the mass ratio is 1.75:1), and carrying out saponification reaction for 1.5 hours; after the reaction is finished, the temperature is raised to 130 ℃, the temperature is kept constant for 30 minutes for water drainage, and the temperature is raised after the water drainage is finishedHeating to the maximum temperature of 195 ℃, then adding the residual base oil, stirring for five minutes, taking out, rapidly cooling, and controlling the quenching temperature to 145 ℃. And continuously cooling to 90 ℃, and sequentially adding an antiwear agent zinc dialkyl dithiophosphate, a preservative barium dinonyl naphthalenesulfonate and a 2, 6-di-tert-butyl p-cresol antioxidant. And dispersing the lubricating grease by a three-roller machine and filling. The typical data for the low noise mixed soap-based grease of this example is compared with the typical data for commercially available greases (commercially available greases 1 to 3 are general purpose low noise lithium-based grease, general purpose lithium complex grease of a certain brand, and ester oil low noise grease) in table 6:
table 6 grease properties of example 6
The performance comparison of the low-noise mixed soap-based grease prepared by the raw materials and the preparation method listed in the embodiment of the invention and the prior commercial grease shows that:
(1) the difference value between the extension working cone penetration and the working cone penetration of the lubricating grease is within the range of 30-40 (0.1mm), and the service life of a high-temperature bearing is more than 450 hours, so that the lubricating grease has excellent mechanical stability and long service life of the bearing;
(2) the roller stability and the water spray loss amount of the lubricating grease are obviously superior to those of the commercially available lubricating grease at the specified temperature in the specified time, and the lubricating grease has outstanding colloid property and water resistance;
(3) the low-temperature torque of the lubricating grease at-40 ℃ is smaller at a specified temperature, which is consistent with the excellent low-temperature performance of the lubricating grease;
(4) the lubricating grease disclosed by the invention has better results on corrosion of steel sheets, corrosion resistance and the like, and the results are consistent with the good corrosion and rust prevention performance of the lubricating grease disclosed by the invention.
(5) The decibel value of the lubricating grease of the invention on a 6201 bearing is about 23dB, and the noise level of BeQuiet + can reach the highest GN4, which is consistent with the excellent silencing performance of the lubricating grease of the invention.
Although the invention has been described in detail hereinabove with respect to a general description and specific embodiments thereof, it will be apparent to those skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. The low-noise mixed soap-based lubricating grease composition is characterized by comprising the following components in percentage by weight:
78-87% of base oil;
9-15% of a thickening agent;
2.0-3.0% of an antiwear agent;
1.0-2.0% of an antirust agent;
1.0-2.0% of an antioxidant;
the base oil is selected from one or more of mineral oil, ether oil or poly-alpha olefin synthetic oil; the antiwear agent is dialkyl dithiophosphate or phosphate, and the antirust agent is a sulfonate compound or benzotriazole;
the thickening agent is a reaction product of dodecahydroxystearic acid, stearic acid or hydrogenated castor oil, lithium hydroxide monohydrate and potassium hydroxide, and the mass ratio of the lithium hydroxide monohydrate to the potassium hydroxide in the thickening agent is 1: 1-9: 1;
the low-noise mixed soap-based lubricating grease composition is prepared by the following method, and comprises the following steps: adding fatty acid into 1/2 base oil, mixing and heating to 85-95 ℃, adding aqueous solution of lithium hydroxide monohydrate and potassium hydroxide after the fatty acid is dissolved, and carrying out saponification reaction for 1.0-1.5 h; then heating to 130-140 ℃, keeping the temperature constant for 20-30 min, then draining water, heating to 195-210 ℃, then adding the residual base oil, stirring for 5min, taking out the base oil, quenching and cooling, and controlling the quenching temperature to be 130-160 ℃; and then continuously cooling to 90-100 ℃, sequentially adding an antiwear agent, an antirust agent and an antioxidant, and dispersing to obtain the wear-resistant antirust paint.
2. The composition of claim 1, wherein the base oil has a congealing point of no more than-25 ℃.
3. The composition of claim 2, wherein the base oil has a pour point of-30 to-50 ℃.
4. The composition as claimed in claim 1, wherein the viscosity of the base oil at 40 ℃ is 70 to 150mm2/s。
5. The composition as claimed in claim 4, wherein the base oil has a viscosity of 70 to 100mm at 40 ℃2/s。
6. The composition of any of claims 1 to 5 wherein the antiwear agent is a dialkyl dithiophosphate.
7. The composition of any of claims 1-5, wherein the rust inhibitor is a sulfonate compound.
8. The composition of any one of claims 1-5, wherein the antioxidant is a phenolic antioxidant.
9. The composition according to any one of claims 1 to 5, wherein the composition is formulated as:
81-87% of base oil;
9-12% of a thickening agent;
2.0-3.0% of an antiwear agent;
1.0-2.0% of an antirust agent;
1.0-2.0% of an antioxidant;
the base oil is mineral oil and poly-alpha-olefin synthetic oil, and the mass ratio of the mineral oil to the poly-alpha-olefin synthetic oil is 1:1, the thickening agent is a lithium potassium mixed soap, the mass ratio of lithium hydroxide monohydrate to potassium hydroxide is 1.75:1, the antiwear agent is dialkyl dithiophosphate, the preservative is a sulfonate compound, and the antioxidant is a phenol antioxidant.
10. A method of preparing a low noise mixed soap based grease composition according to any one of claims 1 to 9 comprising the steps of: adding fatty acid into 1/2 base oil, mixing and heating to 85-95 ℃, adding aqueous solution of lithium hydroxide monohydrate and potassium hydroxide after the fatty acid is dissolved, and carrying out saponification reaction for 1.0-1.5 h; then heating to 130-140 ℃, keeping the temperature for 20-30 min, draining water, heating to 195-210 ℃, adding the rest base oil, stirring for 5min, taking out, quenching and cooling, and controlling the quenching temperature to be 130-160 ℃; and then, continuously cooling to 90-100 ℃, sequentially adding an antiwear agent, an antirust agent and an antioxidant, and dispersing to obtain the anti-wear antirust agent.
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