CN111040855A - Long-life calcium sulfonate-based lubricating grease and preparation method thereof - Google Patents
Long-life calcium sulfonate-based lubricating grease and preparation method thereof Download PDFInfo
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- CN111040855A CN111040855A CN201911367352.XA CN201911367352A CN111040855A CN 111040855 A CN111040855 A CN 111040855A CN 201911367352 A CN201911367352 A CN 201911367352A CN 111040855 A CN111040855 A CN 111040855A
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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
- C10M169/04—Mixtures of base-materials and additives
- C10M169/045—Mixtures of base-materials and additives the additives being a mixture of compounds of unknown or incompletely defined constitution and non-macromolecular compounds
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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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/06—Metal compounds
- C10M2201/062—Oxides; Hydroxides; Carbonates or bicarbonates
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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
- C10M2201/00—Inorganic compounds or elements as ingredients in lubricant compositions
- C10M2201/087—Boron oxides, acids or 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
- C10M2203/00—Organic non-macromolecular hydrocarbon compounds and hydrocarbon fractions as ingredients in lubricant compositions
- C10M2203/02—Well-defined aliphatic compounds
- C10M2203/024—Well-defined aliphatic compounds unsaturated
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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
- C10M2215/00—Organic non-macromolecular compounds containing nitrogen as ingredients in lubricant compositions
- C10M2215/02—Amines, e.g. polyalkylene polyamines; Quaternary amines
- C10M2215/06—Amines, e.g. polyalkylene polyamines; Quaternary amines having amino groups bound to carbon atoms of six-membered aromatic rings
- C10M2215/064—Di- and triaryl amines
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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
- C10M2219/046—Overbasedsulfonic acid 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
- C10M2219/00—Organic non-macromolecular compounds containing sulfur, selenium or tellurium as ingredients in lubricant compositions
- C10M2219/06—Thio-acids; Thiocyanates; Derivatives thereof
- C10M2219/062—Thio-acids; Thiocyanates; Derivatives thereof having carbon-to-sulfur double bonds
- C10M2219/066—Thiocarbamic type compounds
-
- 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
- C10M2219/10—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring
- C10M2219/104—Heterocyclic compounds containing sulfur, selenium or tellurium compounds in the ring containing sulfur and carbon with nitrogen or oxygen in the ring
- C10M2219/106—Thiadiazoles
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention relates to a long-life calcium sulfonate-based lubricating grease and a preparation method thereof, wherein the components in the lubricating grease composition comprise base oil, ultrahigh-base-number calcium alkylbenzene sulfonate, a conversion agent, calcium hydroxide, organic acid, boric acid, an antioxidant and a passivator; the base oil and the calcium alkyl benzene sulfonate with the ultrahigh base number are used as main materials, the calcium hydroxide, the boric acid and the organic acid are used as complexing agents, and the base oil and the calcium alkyl benzene sulfonate with the ultrahigh base number are prepared by mixing, converting, compounding, dehydrating, raising the temperature, cooling, adding a passivating agent and homogenizing the main materials. The invention adopts the composite calcium sulfonate soap as a thickening agent, adopts PAO and/or alkyl naphthalene as base oil, improves the problems of insufficient oil separation, poor oxidation stability, high-temperature oil throwing and the like of the lubricating grease through special process and additive design, initiates a long-life calcium sulfonate-based lubricating grease, and can prolong the service life of an FE9 bearing to (F)50)1More than 50 hours (test conditions: A/1500N/6000rpm-140 ℃).
Description
Technical Field
The invention relates to the technical field of lubricating grease preparation, in particular to long-life calcium sulfonate-based lubricating grease and a preparation method thereof.
Background
There are many disclosures on calcium sulfonate-based grease, but the life of the bearing in the FE9 test of calcium sulfonate-based grease in FAG rolling bearing grease testing machine (test in accordance with DIN51821 Standard "test of Lubricant, using FE9 test of FAG rolling bearing grease tester, test conditions: A/1500N/6000rpm-140 ℃) has not been reported so far. The above test conditions mean that the bearing is assembled in a form a (open type); bearing axial load 1500N; the bearing revolution is 6000 rpm; the test temperature was 140 ℃.
It is generally accepted in the industry that calcium sulfonate-based greases are not suitable for long life greases for several reasons: 1) the oil distribution is small, so that the bearing lubrication is easy to be insufficient; 2) the thickening agent is high in content, the base oil is less, and insufficient bearing lubrication is easily caused; 3) poor oxidation stability and easy coking, which causes insufficient bearing lubrication; 4) the shape of the thickening agent is not long fiber, and the thickening agent is easy to throw out to cause insufficient bearing lubrication.
Disclosure of Invention
The invention provides a long-life calcium sulfonate-based lubricating grease and a preparation method thereof, which adopts composite calcium sulfonate soap as a thickening agent, adopts PAO and/or alkyl naphthalene as base oil, improves the problems of insufficient oil separation, poor oxidation stability, high-temperature oil throwing and the like of the lubricating grease through special process and additive design, initiates a long-life calcium sulfonate-based lubricating grease, and can prolong the service life of an FE9 bearing to (F)50) Over 150 hours (test conditions: A/1500N/6000rpm-140 ℃).
In order to achieve the purpose, the invention adopts the following technical scheme:
the long-life calcium sulfonate-based lubricating grease composition comprises the following components in percentage by weight:
base oil: 36.5% -54.9%;
ultra-high base number calcium alkylbenzene sulfonate: 40.0% -50.0%;
a transforming agent: 1.5 to 3.0 percent
Calcium hydroxide: 0.5 to 1.0 percent;
organic acid: 1% -4%;
boric acid: 1.0% -2.0%;
antioxidant: 1.0% -3.0%;
passivating agent: 0.1 to 0.5 percent;
the long-life calcium sulfonate-based lubricating grease material is prepared by taking base oil and calcium alkyl benzene sulfonate with an ultrahigh base number as main materials, taking calcium hydroxide, boric acid and organic acid as complexing agents, and mixing, converting, compounding, dehydrating, heating, cooling, adding a passivating agent and homogenizing the main materials.
The base oil is one or a mixture of two of PAO and alkyl naphthalene, and the kinematic viscosity at 40 ℃ is 68-320 mm2/s。
The calcium alkyl benzene sulfonate with the ultrahigh base number is a uniform Newtonian body, and has a kinematic viscosity at 100 ℃ of: 70-300 mm2S; TBN Total base number: 350-450 mgKOH/g; the calcium content is not less than 12%; the sulfur content is not less than 1.5%; alkyl carbon number of alkyl benzene sulfonic acid is C12-C35。
The conversion agent is one or a mixture of more than two of low molecular alcohol and low molecular acid with active groups.
The antioxidant is one or a mixture of nonyl diphenylamine and dialkyl dithiocarbamate.
The passivating agent is one or a mixture of two of a methylbenzotriazole derivative and a thiadiazole derivative.
A preparation method of long-life calcium sulfonate-based lubricating grease specifically comprises the following steps:
1) mixing main materials: adding 1/3 addition amount of base oil and calcium alkyl benzene sulfonate with ultra-high base number into a reaction kettle at room temperature, and stirring for more than 30 minutes;
2) and (3) transformation: heating the reaction kettle, diluting the converting agent with 2-5 times of water uniformly, adding the diluted converting agent when the temperature of the reaction kettle reaches more than 50 ℃, stirring, heating to 80-95 ℃, and keeping the temperature for more than 30 minutes until the material is thickened and the infrared characteristic peak is 880-885 cm-1；
3) Compounding: heating the reaction kettle to 90-100 ℃, adding a complexing agent comprising calcium hydroxide diluted by 2 times of water, boric acid dissolved by 2 times of water at 100 ℃ and organic acid step by step, and stirring for reacting for more than 40 minutes;
4) dewatering and heating: heating the reaction kettle to 130-140 ℃, adding 1/3 addition amount of base oil, adding an antioxidant, closing a kettle cover, stirring and heating to above 160 ℃, stopping stirring, and keeping the temperature for 5-10 minutes;
5) cooling: transferring the materials in the reaction kettle to a blending kettle, naturally cooling or cooling to 140 ℃ with water, stopping cooling, adding the residual 1/3 addition amount of base oil, and carrying out primary homogenization treatment for 30-60 minutes by using a homogenizer and a circulating shear;
6) adding a passivating agent: cooling the blending kettle to 100-110 ℃, and adding a passivating agent;
7) and finally, homogenizing: and homogenizing the materials in the blending kettle for 30-60 minutes by using a homogenizer and a circulating shear to obtain the finished product of the lubricating grease.
The technical indexes of the prepared finished product lubricating grease are shown in the following table.
Compared with the prior art, the invention has the beneficial effects that:
the long-life calcium sulfonate-based lubricating grease disclosed by the invention is characterized in that: the composite calcium sulfonate soap is used as a thickening agent, PAO and/or alkyl naphthalene are used as base oil, and the problems of insufficient oil separation, poor oxidation stability, high-temperature oil throwing and the like of the lubricating grease are solved through special process and additive design, so that the long-life calcium sulfonate base lubricating grease is created for the first time, and the service life of an FE9 bearing can be prolonged to (F)50) Over 150 hours (test conditions: A/1500N/6000rpm-140 ℃).
Detailed Description
The invention relates to long-life calcium sulfonate-based lubricating grease which comprises the following components in percentage by weight:
base oil: 36.5% -54.9%;
ultra-high base number calcium alkylbenzene sulfonate: 40.0% -50.0%;
a transforming agent: 1.5 to 3.0 percent
Calcium hydroxide: 0.5 to 1.0 percent;
organic acid: 1% -4%;
boric acid: 1.0% -2.0%;
antioxidant: 1.0% -3.0%;
passivating agent: 0.1 to 0.5 percent;
the long-life calcium sulfonate-based lubricating grease material is prepared by taking base oil and calcium alkyl benzene sulfonate with an ultrahigh base number as main materials, taking calcium hydroxide, boric acid and organic acid as complexing agents, and mixing, converting, compounding, dehydrating, heating, cooling, adding a passivating agent and homogenizing the main materials.
The base oil is one or a mixture of two of PAO and alkyl naphthalene, and the kinematic viscosity at 40 ℃ is 68-320 mm2/s。
The calcium alkyl benzene sulfonate with the ultrahigh base number is a uniform Newtonian body, and has a kinematic viscosity at 100 ℃ of: 70-300 mm2S; TBN Total base number: 350-450 mgKOH/g; the calcium content is not less than 12%; the sulfur content is not less than 1.5%; alkyl carbon number of alkyl benzene sulfonic acid is C12-C35。
The conversion agent is one or a mixture of more than two of low molecular alcohol and low molecular acid with active groups.
The antioxidant is one or a mixture of nonyl diphenylamine and dialkyl dithiocarbamate.
The passivating agent is one or a mixture of two of a methylbenzotriazole derivative and a thiadiazole derivative.
A preparation method of long-life calcium sulfonate-based lubricating grease specifically comprises the following steps:
1) mixing main materials: adding 1/3 addition amount of base oil and calcium alkyl benzene sulfonate with ultra-high base number into a reaction kettle at room temperature, and stirring for more than 30 minutes;
2) and (3) transformation: heating the reaction kettle, diluting the converting agent with 2-5 times of water uniformly, adding the diluted converting agent when the temperature of the reaction kettle reaches more than 50 ℃, stirring, heating to 80-95 ℃, and keeping the temperature for more than 30 minutes until the material is thickened and the infrared characteristic peak is 880-885 cm-1；
3) Compounding: heating the reaction kettle to 90-100 ℃, adding a complexing agent comprising calcium hydroxide diluted by 2 times of water, boric acid dissolved by 2 times of water at 100 ℃ and organic acid step by step, and stirring for reacting for more than 40 minutes;
4) dewatering and heating: heating the reaction kettle to 130-140 ℃, adding 1/3 addition amount of base oil, adding an antioxidant, closing a kettle cover, stirring and heating to above 160 ℃, stopping stirring, and keeping the temperature for 5-10 minutes;
5) cooling: transferring the materials in the reaction kettle to a blending kettle, naturally cooling or cooling to 140 ℃ with water, stopping cooling, adding the residual 1/3 addition amount of base oil, and carrying out primary homogenization treatment for 30-60 minutes by using a homogenizer and a circulating shear;
6) adding a passivating agent: cooling the blending kettle to 100-110 ℃, and adding a passivating agent;
7) and finally, homogenizing: and homogenizing the materials in the blending kettle for 30-60 minutes by using a homogenizer and a circulating shear to obtain the finished product of the lubricating grease.
The technical indexes of the prepared finished product lubricating grease are shown in the following table.
The ultrahigh-base-number calcium alkylbenzene sulfonate comprises three components: calcium carbonate, calcium alkyl benzene sulfonate and diluent oil. Wherein the calcium carbonate is amorphous aggregate existing in molecular form, is wrapped into micelle by calcium alkyl benzene sulfonate and is dissolved in the diluent oil; the size of the micelle has an important influence on the transformation efficiency and the transformation effect. The amorphous calcium carbonate is converted into nano-sized calcite calcium carbonate under the action of a proper conversion process and a conversion agent, and the functions are as follows: the material system is thickened into grease; the abrasion spot is small; the friction coefficient is small.
The sulfonic acid in the calcium alkyl benzene sulfonate is C12-C35The mixture of petroleum sulfonic acid and synthetic sulfonic acid mainly has the function of forming neutral calcium soaps, and the neutral calcium soaps wrap calcium carbonate to form micelles and are dissolved in diluent oil; calcium sulfonate soaps with different alkyl groups have different effects on thickening ability, water resistance and rust resistance of the grease.
The diluent oil in the ultrahigh-base-number calcium alkyl benzene sulfonate plays a role of a solvent, so that a solute (calcium carbonate micelles wrapped by calcium sulfonate) is uniformly dispersed in the ultrahigh-base-number calcium alkyl benzene sulfonate, and the ultrahigh-base-number calcium alkyl benzene sulfonate has certain fluidity and is convenient to produce and operate. The diluent oil is PAO and alkylOne or a mixture of two of naphthalene, the kinematic viscosity at 40 ℃ of which is 70-220 mm2And s. After the above-mentioned materials (calcium carbonate, calcium alkylbenzenesulfonate and diluent oil) are mixed, the whole ultrahigh-base-number calcium alkylbenzenesulfonate is made into Newtonian body, under the action of accelerating agent and converting agent the non-Newtonian body is formed, and then the thixotropic lubricating grease is formed by means of thickening action of composite soap.
The transforming agent is one or a mixture of low molecular alcohol and low molecular acid with active groups, wherein the low molecular alcohol is methanol, ethanol, n-butanol and the like, and the low molecular acid is formic acid, acetic acid and the like. Usually, the mixture is diluted by 2-5 times of water and then added into a reaction kettle to perform a conversion action at a certain temperature for a certain time.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.
[ examples ] A method for producing a compound
In this embodiment, the weight ratio of each component in the grease composition is shown in table 1:
TABLE 1
| Components | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 | Example 8 |
| PAO10 | 11.9 | 10.7 | 0 | 0.9 | 3.6 | 0.2 | 19.8 | 6.75 |
| PAO40 | 40 | 20 | 15 | 10 | 0 | 0 | 10 | 28 |
| Alkyl naphthalene AN23 | 0 | 15 | 26.5 | 30 | 40 | 45 | 20 | 15 |
| Synthetic calcium sulfonate with ultrahigh base number | 40 | 45 | 50 | 48 | 46 | 44 | 42 | 40 |
| Methanol | 0.5 | 1 | 0.5 | 0 | 1 | 2 | 1.5 | 2 |
| Ethanol | 0.5 | 0.8 | 1 | 1.2 | 0 | 0.3 | 0.2 | 0.3 |
| Acetic acid | 0.5 | 0.6 | 0.8 | 0.6 | 0.5 | 0.6 | 0.8 | 0.7 |
| Boric acid | 2 | 1.5 | 1 | 1.5 | 2 | 1 | 1.5 | 2 |
| Dodecahydroxy stearic acid | 1 | 2 | 3 | 4 | 3.5 | 2.5 | 1.5 | 2.2 |
| Calcium hydroxide | 0.5 | 0.6 | 0.7 | 0.8 | 0.9 | 1 | 0.5 | 0.8 |
| Nonyl diphenylamine | 3 | 2 | 1 | 0 | 2 | 0 | 0.5 | 1.5 |
| Dialkyl dithio carbamate | 0 | 0.5 | 0 | 2.5 | 0 | 3 | 1.5 | 0.5 |
| Methylphenyltriazole derivative | 0.1 | 0.2 | 0.3 | 0.5 | 0 | 0.1 | 0.1 | 0 |
| Thiadiazole derivatives | 0 | 0.1 | 0.2 | 0 | 0.5 | 0.3 | 0.1 | 0.25 |
In this example, the preparation process parameters of the long-life calcium sulfonate-based grease are shown in table 2:
TABLE 2
The long-life complex calcium sulfonate grease prepared in the above 8 examples was tested and the results are shown in table 3:
the above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (8)
1. The long-life calcium sulfonate-based lubricating grease is characterized in that the lubricating grease composition comprises the following components in percentage by weight:
base oil: 36.5% -54.9%;
ultra-high base number calcium alkylbenzene sulfonate: 40.0% -50.0%;
a transforming agent: 1.5 to 3.0 percent
Calcium hydroxide: 0.5 to 1.0 percent;
organic acid: 1% -4%;
boric acid: 1.0% -2.0%;
antioxidant: 1.0% -3.0%;
passivating agent: 0.1 to 0.5 percent;
the long-life calcium sulfonate-based lubricating grease material is prepared by taking base oil and calcium alkyl benzene sulfonate with an ultrahigh base number as main materials, taking calcium hydroxide, boric acid and organic acid as complexing agents, and mixing, converting, compounding, dehydrating, heating, cooling, adding a passivating agent and homogenizing the main materials.
2. The long-life calcium sulfonate-based grease as claimed in claim 1, wherein the base oil is PAO, alkylOne or two of naphthalene are mixed, and the kinematic viscosity at 40 ℃ is 68-320 mm2/s。
3. The long-life calcium sulfonate-based grease as claimed in claim 1, wherein the calcium alkylbenzene sulfonate is a homogeneous newtonian compound having a kinematic viscosity at 100 ℃: 70-300 mm2S; TBN Total base number: 350-450 mgKOH/g; the calcium content is not less than 12%; the sulfur content is not less than 1.5%; alkyl carbon number of alkyl benzene sulfonic acid is C12-C35。
4. The long-life calcium sulfonate-based grease as claimed in claim 1, wherein the conversion agent is one or a mixture of two or more of low molecular alcohol and low molecular acid having active groups.
5. The long life calcium sulfonate grease as claimed in claim 1, wherein said antioxidant is one or a mixture of nonyl diphenylamine, dialkyl dithiocarbamate.
6. The long-life calcium sulfonate-based grease as claimed in claim 1, wherein the passivating agent is one or a mixture of two of a methylbenzotriazole derivative and a thiadiazole derivative.
7. The method for preparing the long-life calcium sulfonate-based lubricating grease as claimed in any one of claims 1 to 6, which comprises the following steps:
1) mixing main materials: adding 1/3 addition amount of base oil and calcium alkyl benzene sulfonate with ultra-high base number into a reaction kettle at room temperature, and stirring for more than 30 minutes;
2) and (3) transformation: heating the reaction kettle, diluting the converting agent with 2-5 times of water uniformly, adding the diluted converting agent when the temperature of the reaction kettle reaches more than 50 ℃, stirring, heating to 80-95 ℃, and keeping the temperature for more than 30 minutes until the material is thickened and the infrared characteristic peak is 880-885 cm-1；
3) Compounding: heating the reaction kettle to 90-100 ℃, adding a complexing agent comprising calcium hydroxide diluted by 2 times of water, boric acid dissolved by 2 times of water at 100 ℃ and organic acid step by step, and stirring for reacting for more than 40 minutes;
4) dewatering and heating: heating the reaction kettle to 130-140 ℃, adding 1/3 addition amount of base oil, adding an antioxidant, closing a kettle cover, stirring and heating to above 160 ℃, stopping stirring, and keeping the temperature for 5-10 minutes;
5) cooling: transferring the materials in the reaction kettle to a blending kettle, naturally cooling or cooling to 140 ℃ with water, stopping cooling, adding the residual 1/3 addition amount of base oil, and carrying out primary homogenization treatment for 30-60 minutes by using a homogenizer and a circulating shear;
6) adding a passivating agent: cooling the blending kettle to 100-110 ℃, and adding a passivating agent;
7) and finally, homogenizing: and homogenizing the materials in the blending kettle for 30-60 minutes by using a homogenizer and a circulating shear to obtain the finished product of the lubricating grease.
8. The method for preparing the long-life calcium sulfonate-based lubricating grease of claim 7, wherein the technical indexes of the prepared finished lubricating grease are shown in the following table.
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