KR101992634B1 - Method of Preparation of Excellent Lubricous Lubricant Composition - Google Patents

Abstract

More particularly, the present invention relates to a method for producing a lubricant composition having excellent lubrication performance, and more particularly, to a method for producing a lubricant composition having excellent lubricity, comprising the steps of adding an excess metal to an alcohol containing a linear or branched C ₁ -C ₂₂ saturated alkyl group, To a process for producing a lubricant composition excellent in lubricating performance suitable for a lubricant additive.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a lubricant composition,

The present invention relates to a lubricant composition having a high total TBN (TBN) and lubricating performance, which can be used as a lubricant additive.

The preparation of an overbased calcium or barium salt of an alkyl phenol and a sulfonic acid is described in U.S. Patent Nos. 2,616,904; 2,760,970, 2,767,164, 2,798,852, 2,802,816, 3,027,325, 3,779,922. The use of overbased barium salts in stabilizer formulations has been increasing in recent years. This is mainly due to the fact that the overbased barium salt has a better performance than the neutral barium salt. The beneficial performance associated with the overbased barium salt is low plate-out, excellent color retention, excellent long-term thermal stability performance, good compatibility with the stabilizer component, and the like. Unfortunately, most of the overbased barium salts are dark in color, while these dark colored, overbased barium salts are effective stabilizers against halogen-containing organic polymers, and their dark color results in a fading of the final product. This feature essentially avoids the use of dark colored, overbased barium salts in applications where a light colored polymer product is desired. According to the teachings of U.S. Patent No. 4,665,117, photo-colored alkali or alkaline earth metal salts are used in which an alkylphenol is used as a promoter. However, alkylphenols are also a major cause for the expression of the hue of the end product, which is overcome to limit the formation of colored species by using propylene oxide to replace the hydrogen of the phenolic hydroxyl group. Propylene oxide is listed as a potent eye irritant and prolonged exposure to propylene oxide vapors may result in permanent damage to the eye. U.S. Pat. Nos. 3,766,066 and 3,766,067 disclose the use of a solid calcium-containing micelle complex (calcium containing from micronized, homogenized and carbonated calcium and organic acid salts of a "conversion agent" such as water and alcohols micellar complex. < / RTI > It is necessary to apply the salt solution in the inert organic liquid diluent to the homogenization step while vigorously stirring in the presence of water, alcohol or a mixture of alcohol and water to prepare the desired micelle complex from the overbased salt. Homogenization is achieved by producing crystalline particles characterized by a pattern corresponding to the x-ray diffraction pattern of calcite by " thickening "or " gelling" phenomenon. However, x-ray diffraction studies of starting salt solutions do not indicate the presence of any crystalline calcium carbonate. U.S. Patent No. 5,830,832 also describes the preparation of calcium and basic soaps in the form of powders from branched-chain oxo-acids.

The use of normal salts of petroleum sulfonic acids as additives for lubricating oil compositions is well known. During World War II, normal metal sulfonates derived from mahogany or petroleum sulfonic acid were used as detergent additives in internal combustion engine crankcase oils. Calcium or barium was used as the metal in these sulfonates. The sulfonate products, which contain two more metals than the corresponding metal sulfonates, were then found to have improved detergency and the ability to neutralize acidic contaminants and were used instead of the normal sulfonates. More recently, completely soluble sulfonates have been developed that contain metals from three to twenty times more than the corresponding normal metal sulfonates. These high based sulfonates have been identified as "overbased", "superbased", and "hyperbased".

Over the years, a number of methods have been described for preparing overbased sulfonates. Generally, such an overbased sulfonate mixes the promoter and solvent with a metal salt of either a normal sulfonate and an excess of an alkali or alkaline earth metal, and heats the resulting mixture. The resulting reaction mass has been produced by carbonation and carbonation of sufficient carbon dioxide in the product to increase the content of the colloidally dispersed metal base and then filtering out the resulting material. Some specific methods are summarized in the following paragraphs.

U.S. Pat. No. 3,488,284 describes a process for preparing an oil base metal complex made by treating an oil soluble sulfonic acid with a metal base in the presence of an acid gas and an alcohol promoter. This process is said to produce an oil-soluble metal-containing composition having a "metal ratios", ie, a ratio of the metal content in the normal salt form of the total metal to the sulfonic acid in the product being about 7 times or more.

U.S. Pat. No. 3,446,736 describes the formation of calcium sulfonate-calcium carbonate products by preparing a calcium carbonate titer in methanol and reacting the titer with a sulfonic acid or sulfonate salt. For example, a calcium carbonate titer prepared by carbonating a suitable calcium-inorganic compound in methanol to carbon dioxide at a temperature of less than about 30 DEG C was mixed with a sulfonic acid or sulfonate solution in a mineral oil.

U.S. Patent No. 3,496,105 discloses overbased be compound, for example, oil-soluble sulfonic acid or sulfonate, substantially inert, organic solvent, II-group metal base, an alcoholic or a phenolic promoter, CO2, H ₂ in preparing the overbased material S, SO ₂ , or SO ₃ . The temperature at which the acidic material contacts the remainder of the reaction mass depends on the promoter used.

Therefore, various studies have been continuously conducted on lubricant compositions containing an overbased sulfonate, and there is a demand for further improvement in their methods and applications when they are applied.

An object of the present invention is to provide a process for producing an environmentally friendly lubricant composition having an excellent ability of biodegradation and lubrication by reacting an alcohol containing a straight or branched chain saturated alkyl group of C ₁ -C ₂₂ with an alkaline earth metal salt and adding mineral oil .

According to one aspect of the present invention,

(a) reacting an alcohol comprising a C ₁ -C ₂₂ linear or branched saturated alkyl group with a sulfonic acid and converting it to an alkyl sulfonic acid;

(b) treating the alkyl sulfonic acid with a compound of an alkaline earth metal in a solvent;

(c) reacting the alkaline earth metal-treated alkyl sulfonic acid with carbon dioxide gas to convert it into an overbased metal sulfonate represented by the following general formula (1); And

(d) adding a mineral oil to the overbased metal sulfonate and distilling the solvent to produce a lubricant composition;

≪ RTI ID = 0.0 > a < / RTI > lubricant composition.

[Chemical Formula 1]

Wherein R is a linear or branched saturated alkyl group having _{1 to 22} carbon atoms and X is an alkaline earth metal atom.

According to another aspect of the present invention, there is provided a lubricant composition produced by the above process.

According to another aspect of the present invention, the present invention provides a lubricant additive comprising a lubricant composition.

According to the production process of the present invention, the lubricant composition has a high TBN value by reacting an alkanol compound containing a C ₁ -C ₂₂ linear or branched saturated alkyl group not containing a benzene group with an alkaline earth metal salt, .

Further, the lubricant composition of the present invention can produce an environmentally friendly lubricant additive excellent in lubrication performance and biodegradability by adding paraffinic or naphthenic mineral oil to an overbased metal sulfonate.

The present invention relates to a lubricant composition excellent in biodegradability and lubrication performance by adding a paraffinic or naphthenic mineral oil by neutralizing and overbasing a C ₁ -C ₂₂ alcohol containing a linear or branched saturated alkyl group with an alkaline earth metal salt .

According to one aspect of the present invention,

(a) reacting an alcohol comprising a C ₁ -C ₂₂ linear or branched saturated alkyl group with a sulfonic acid and converting it to an alkyl sulfonic acid;

(b) treating the alkyl sulfonic acid with a compound of an alkaline earth metal in a solvent;

(c) reacting the alkaline earth metal-treated alkyl sulfonic acid with carbon dioxide gas to convert it into an overbased metal sulfonate represented by the following general formula (1); And

(d) adding a mineral oil to the overbased metal sulfonate and distilling the solvent to produce a lubricant composition;

≪ RTI ID = 0.0 > a < / RTI > lubricant composition.

[Chemical Formula 1]

Wherein R is a linear or branched saturated alkyl group having _{1 to 22} carbon atoms and X is an alkaline earth metal atom.

According to a preferred embodiment of the present invention, the alcohol containing C ₁ -C ₂₂ linear or branched saturated alkyl groups in step (a) is selected from octanol, lauryl alcohol, cetyl alcohol, stearyl alcohol, The sulfonic acid is preferably a halosulfonic acid, and most preferably a chlorosulfonic acid.

According to a preferred embodiment of the present invention, the solvent in step (b) may be one or more selected from the group consisting of water, methanol, ethanol, hexane, heptane, xylene, toluene and benzene, The use ratio of the solvent is preferably 10 to 80% by weight, more preferably 30 to 50% by weight, based on the alkylsulfonic acid content. If it is less than 10% by weight, overbasing can not be achieved.

According to a preferred embodiment, the compound of the alkaline earth metal in the step (b) is the group consisting of _{Ca (OH) 2, CaO,} CaCO 3, Ba (OH) 2, BaO, Mg (OH) 2 and MgO Can be used alone or in combination of two or more. The alkaline earth metal is preferably used in an amount of 0.5 to 1 mol based on 1 mol of the alkylsulfonic acid, and the reaction is preferably carried out at a temperature of 40 ° C.

According to a preferred embodiment of the present invention, in step (c), an alkyl sulfonic acid treated with an alkaline earth metal is reacted with carbon dioxide gas to convert it into an overbased metal sulfonate at a temperature of 20 to 80 ° C. Can be converted to carbonitrides to exhibit a high TBN value. At this time, the amount of the carbon dioxide gas is preferably 20 to 80% by weight, more preferably 40 to 70% by volume, based on the amount of the alkyl sulfonic acid treated with the alkaline earth metal. At this time, when the amount of the carbon dioxide gas is less than 20% by volume, the rate of overbasing is very low. When the amount of the carbon dioxide gas is more than 80% by volume, the phase becomes turbid and precipitates are generated.

According to a preferred embodiment of the present invention, an enhancer may be further added to the alkylsulfonic acid treated with the alkaline earth metal in the step (c). As the enhancer, _one or a mixture of two or more selected from the group consisting of acetic acid, formic acid, C ₁ -C ₁₈ fatty acids, ethanol and methanol may be used. In this case, the amount of the enhancer is preferably 1 to 20% by weight, more preferably 5 to 10% by weight, based on the amount of the alkyl sulfonic acid treated with the alkaline earth metal. When the amount is less than 1% by weight, there is a phenomenon that it does not act as an enhancer. When the amount is more than 20% by weight, the phase becomes turbid and precipitates are generated.

According to a preferred embodiment of the present invention, the mineral oil in the step (d) is preferably one or two kinds selected from the group consisting of paraffin type and naphthenic type, and has a property of imparting excellent lubrication performance. In this case, the content of the mineral oil is preferably 30 to 80% by weight, more preferably 40 to 60% by weight, and the solvent is distilled at a temperature of 150 to 180 ° C .

According to another aspect of the present invention, there is provided a lubricant composition produced by the method for producing the lubricant composition.

According to another embodiment of the present invention, a lubricant additive comprising the lubricant composition can be used.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited by the following Examples.

Example 1

92.14 g (1 mole, molecular weight 92.14) of octanol was placed in a 1 L, four-necked flask reactor equipped with a stirrer, a thermometer and a distillation apparatus equipped with a condenser, and 116.52 g Mol, molecular weight 116.52) was slowly added thereto to convert it to an alkyl sulfonic acid. After the addition, 50 g of methanol and 500 g of hexane were added, and 108 g of CaCO ₃ (molecular weight 100.08) was added at 40 ° C. with stirring at 30 ° C. for about 1 hour while blowing air to remove residual hydrogen chloride gas Respectively. When the addition of CaCO ₃ was completed, the internal temperature of the reactor was maintained at 40 ° C, 340 g of CO ₂ (molecular weight 44.0) was added, and the reaction was conducted for 3 hours to convert it into perchlorinated octanol sulfonate (210.3 g). Then, paraffinic mineral oil (50%, 210.3 g) was added to the perchloric octanol sulfonate (210.3 g) at 40 ° C, and the temperature was raised to 150 ° C to remove the solvent. ≪ / RTI >

Example 2

Paraffinic mineral oil (60%, 315.4 g) was added to perchlorinated octanol sulfonate (210.3 g) having octanol added thereto in the same manner as in Example 1, To remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Example 3

Paraffinic mineral oil (70%, 490.68 g) was added to the perchloric octanol sulfonate (210.3 g) having octanol added thereto in the same manner as in Example 1, To remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Example 4

Paraffinic mineral oil (50%, 210.3 g) was added to 210.3 g of an overbased lauryl alcohol sulphonate to which lauryl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Example 5

Paraffinic mineral oil (60%, 315.4 g) was added to 210.3 g of an overbased lauryl alcohol sulfonate to which lauryl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 ° C to remove the solvent to prepare a lubricant composition that was in a liquid state at room temperature.

Example 6

Paraffinic mineral oil (70%, 490.7 g) was added to 210.3 g of perchlorinated lauryl alcohol sulfonate to which lauryl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Example 7

Paraffinic mineral oil (50%, 210.3 g) was added to 210.3 g of an overbased cetyl alcohol sulphonate to which cetyl alcohol was added in the same manner as in Example 1, And the solvent was removed by raising the temperature to 150 DEG C to prepare a lubricant composition present in a liquid state at room temperature.

Example 8

Paraffinic mineral oil (60%, 315.4 g) was added to a hyperbrasive cetyl alcohol sulphonate (210.3 g) to which cetyl alcohol had been added in the same manner as in Example 1, Was heated to 150 DEG C to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Example 9

Paraffinic mineral oil (70%, 490.7 g) was added to 210.3 g of an overbased cetyl alcohol sulphonate to which cetyl alcohol was added in the same manner as in Example 1, And the solvent was removed by raising the temperature to 150 DEG C to prepare a lubricant composition present in a liquid state at room temperature.

Example 10

The same procedure as in Example 1 was carried out except that paraffinic mineral oil (50%, 210.3 g) was added to an overbased stearyl alcohol sulphonate (210.3 g) to which stearyl alcohol had been added The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Example 11

Paraffinic mineral oil (60%, 315.4 g) was added to an overbased stearyl alcohol sulfonate (210.3 g) to which stearyl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Example 12

Paraffinic mineral oil (70%, 490.7 g) was added to an overbased stearyl alcohol sulphonate (210.3 g) to which stearyl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 1

Paraffinic mineral oil (40%, 140.2 g) was added to the perchloric octanol sulfonate (210.3 g) having octanol added thereto in the same manner as in Example 1, To remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 2

Paraffinic mineral oil (80%, 841.2 g) was added to perchlorinated octanol sulfonate (210.3 g) having octanol added thereto in the same manner as in Example 1, To remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 3

Naphthenic mineral oil (50%, 210.3 g) was added to the perchloric octanol sulfonate (210.3 g), to which octanol was added in the same manner as in Example 1, To remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 4

Except that naphthenic mineral oil (60%, 315.4 g) was added to the perchlorated octanol sulfonate (210.3 g) having octanol added in the same manner as in Example 1, To remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 5

Paraffinic mineral oil (40%, 140.2 g) was added to an overbased lauryl alcohol sulphonate (210.3 g) to which lauryl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 6

Paraffinic mineral oil (80%, 841.2 g) was added to an overbased lauryl alcohol sulphonate (210.3 g) to which lauryl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 7

Naphthenic mineral oil (50%, 210.3 g) was added to 210.3 g of an overbased lauryl alcohol sulphonate to which lauryl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 8

Naphthenic mineral oil (60%, 315.4 g) was added to 210.3 g of an overbased lauryl alcohol sulphonate to which lauryl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 9

Paraffinic mineral oil (40%, 140.2 g) was added to 210.3 g of an overbased cetyl alcohol sulphonate to which cetyl alcohol was added in the same manner as in Example 1, And the solvent was removed by raising the temperature to 150 DEG C to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 10

Paraffinic mineral oil (80%, 841.2 g) was added to 210.3 g of an overbased cetyl alcohol sulphonate to which cetyl alcohol had been added in the same manner as in Example 1, And the solvent was removed by raising the temperature to 150 DEG C to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 11

Naphthenic mineral oil (50%, 210.3 g) was added to 210.3 g of an overbased cetyl alcohol sulphonate to which cetyl alcohol was added in the same manner as in Example 1, And the solvent was removed by raising the temperature to 150 DEG C to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 12

(60%, 315.4 g) was added to 210.3 g of an overbased cetyl alcohol sulphonate to which cetyl alcohol was added in the same manner as in Example 1, And the solvent was removed by raising the temperature to 150 DEG C to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 13

A paraffinic mineral oil (40%, 140.2 g) was added to an overbased stearyl alcohol sulfonate (210.3 g) to which stearyl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 14

Paraffinic mineral oil (80%, 841.2 g) was added to an overbased stearyl alcohol sulfonate (210.3 g) to which stearyl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 15

Naphthenic mineral oil (50%, 210.3 g) was added to 210.3 g of perchlorated stearyl alcohol sulphonate to which stearyl alcohol was added in the same manner as in Example 1, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

Comparative Example 16

Naphthenic mineral oil (60%, 315.4 g) was added to an overbased stearyl alcohol sulfonate (210.3 g) which was treated in the same manner as in Example 1 except that stearyl alcohol was added, The temperature was raised to 150 캜 to remove the solvent to prepare a lubricant composition present in a liquid state at room temperature.

division Overbased metal sulfonate Mineral oil Kinds Content (% by weight) Kinds Content (% by weight) Example 1 Overbased vaporized octanol sulfonate 50 Paraffin system 50 Example 2 40 60 Example 3 30 70 Example 4 Overbased lauryl alcohol (Lauyl alcohol) Sulfonate 50 Paraffin system 50 Example 5 60 60 Example 6 70 70 Example 7 Overbased vapor Cetyl alcohol Sulfonate 50 Paraffin system 50 Example 8 40 60 Example 9 30 70 Example 10 Overbased stearyl alcohol sulfonate 50 Paraffin system 50 Example 11 40 60 Example 12 30 70 Comparative Example 1 Overbased vaporized octanol sulfonate 60 Paraffin system 40 Comparative Example 2 20 80 Comparative Example 3 50 Naphthenic system 50 Comparative Example 4 40 60 Comparative Example 5 Overbased lauryl alcohol (Lauyl alcohol) Sulfonate 40 Paraffin system 40 Comparative Example 6 20 80 Comparative Example 7 50 Naphthenic system 50 Comparative Example 8 40 60 Comparative Example 9 Overbased vapor Cetyl alcohol Sulfonate 60 Paraffin system 40 Comparative Example 10 20 80 Comparative Example 11 50 Naphthenic system 50 Comparative Example 12 40 60 Comparative Example 13 Overbased stearyl alcohol sulfonate 60 Paraffin system 40 Comparative Example 14 20 80 Comparative Example 15 50 Naphthenic system 50 Comparative Example 16 40 60

Experimental Example

The final properties, lubrication performance and total base number (TBN) of the lubricant compositions prepared in Examples 1 to 12 and Comparative Examples 1 to 16 are shown in Table 2 below.

[How to measure]

After the sample solution was left at 60 ° C for 1 hour, the sample was placed in a Gardner measuring cell and color was measured by Gardner colorimetry.

The lubrication performance was measured by immersing the synthesized lubricant composition in a specimen (5 cm * 5 cm) for 1 to 2 minutes and then coating the specimen with a salt sprayer and measuring the degree of corrosion on the specimen.

The TBN was prepared by dissolving 1 g of the sample in a mixed solvent of benzene and acetic acid in a ratio of 1: 1, and measuring the TBN using a measuring device.

division Overbased metal sulfonate Appearance (G) TBN Lubrication performance (%) Example 1 Overbased vaporized octanol sulfonate 15 298 5 Example 2 13 310 7 Example 3 17 302 5 Example 4 Overbased lauryl alcohol (Lauyl alcohol) Sulfonate 11 289 5 Example 5 10 295 3 Example 6 14 324 9 Example 7 Overbased vapor Cetyl alcohol Sulfonate 14 301 7 Example 8 18 286 5 Example 9 11 297 5 Example 10 Overbased stearyl alcohol sulfonate 15 309 8 Example 11 17 311 3 Example 12 13 305 5 Comparative Example 1 Overbased vaporized octanol sulfonate Side charge 12 95 Comparative Example 2 Side charge 3 95 Comparative Example 3 Side charge Side charge 90 Comparative Example 4 Side charge Side charge 85 Comparative Example 5 Overbased lauryl alcohol (Lauyl alcohol) Sulfonate 402 5 87 Comparative Example 6 512 17 90 Comparative Example 7 Side charge 4 95 Comparative Example 8 Side charge 3 95 Comparative Example 9 Overbased vapor Cetyl alcohol Sulfonate 399 3 95 Comparative Example 10 398 One 87 Comparative Example 11 470 Side charge 90 Comparative Example 12 Side charge Side charge 90 Comparative Example 13 Overbased stearyl alcohol sulfonate 490 7 85 Comparative Example 14 Side charge 2 90 Comparative Example 15 Side charge Side charge 93 Comparative Example 16 Side charge Side charge 95

As shown in Table 2, the lubricant composition prepared by adding the mineral oil to the overbased metal sulfonate has a transparent appearance, a high TBN value, and excellent lubrication performance. At this time, the content of the mineral oil is preferably 30 to 80% by weight, more preferably 40 to 60% by weight.

Claims (13)

(a) reacting an alcohol comprising a C ₁ -C ₂₂ linear or branched saturated alkyl group with a sulfonic acid and converting it to an alkyl sulfonic acid;
(b) treating the alkyl sulfonic acid with a compound of an alkaline earth metal in a solvent;
(c) reacting the alkaline earth metal-treated alkyl sulfonic acid with carbon dioxide gas to convert it into an overbased metal sulfonate represented by the following general formula (1); And
(d) adding 50 to 70% by weight of a mineral oil to 30 to 50% by weight of the overbased metal sulfonate and distilling the solvent to prepare a lubricant composition;
Lt; / RTI >
The solvent in step (b) is one or more selected from the group consisting of methanol, ethanol, hexane, heptane, xylene, toluene and benzene,
Wherein the mineral oil in step (d) is a paraffinic oil.
[Chemical Formula 1]

Wherein R is a linear or branched saturated alkyl group having _{1 to 22} carbon atoms and X is an alkaline earth metal atom.
delete The method according to claim 1, a compound of alkaline earth metal in the step (b) is a _{Ca (OH) 2, CaO,} CaCO 3, Ba (OH) 2, 1 member selected from the group consisting of BaO, Mg (OH) ₂ and MgO Or two or more kinds of lubricant compositions.
[2] The method of claim 1, wherein the alkaline earth metal in step (b) is used in an amount of 0.5 to 1 mol based on 1 mol of the alkylsulfonic acid.
The method according to claim 1, wherein the amount of the carbon dioxide gas introduced in step (c) is 20 to 80% by weight based on the weight of the alkyl sulfonic acid treated with the alkaline earth metal.
The method for producing a lubricant composition according to claim 1, wherein in step (c), an enhancing agent is further added to the alkylsulfonic acid treated with an alkaline earth metal.
[Claim 6] The method according to claim 6, wherein the enhancer is _one or a mixture of two or more selected from the group consisting of acetic acid, formic acid, C ₁ to C ₁₈ fatty acids, ethanol and methanol.
[7] The method of claim 6, wherein the amount of the enhancer is 1 to 20% by weight based on the weight of the alkylsulfonic acid treated with the alkaline earth metal.
delete delete The method according to claim 1, wherein the temperature for distilling the solvent in step (d) is 150 to 180 ° C.
A lubricant composition prepared by the process of any one of claims 1, 3 to 8 and 11.
A lubricating oil additive comprising the lubricating composition of claim 12.