JPH07247494A - Reclaimed lubricant composition - Google Patents

Abstract

PURPOSE:To obtain a reclaimed lubricating oil composition excellent in high temperature oxidation stability and suitable for engines, etc., by adding a prescribed amount of a specific alkaline earth metal sulfonate, etc., to a reclaimed base oil produced by repurifying a spent lubricating oil. CONSTITUTION:This reclaimed lubricating oil composition comprises (A) a reclaimed base oil produced by repurifying a spent lubricating oil and (B) 0.1-5wt.% of an alkaline earth metal sulfonate such as the calcium salt of a lubricating oil having a base value of <=400mgKOH/g and a mol.wt. of 400-600 or a synthetically alkylated aromatic compound sulfonated product or of the mixture of the either component B with an alkaline earth metal salicylate produced by alkylating phenol with a 14-18C alpha-olefin, converting the reaction product into an alkali metal salt, introducing a carboxyl group into the product by a Kolbe-Schmitt's reaction, subjecting the product to a double decomposition reaction, etc., and subsequently converting the product into an alkaline earth metal salicylate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a regenerated lubricating oil composition, and in particular, a regenerated lubricating oil composition effectively preventing the deterioration of high-temperature oxidation stability which is remarkably observed when it is used as an engine lubricating oil. Regarding

[0002]

2. Description of the Related Art From the viewpoint of environmental protection and resource saving, the reuse of used lubricating oil for lubricating oil has been increasing recently. Overseas, already, regenerated base oil or regenerated engine oil using regenerated base oil is commercially available. These recycled engine oils are produced by adding various package additives to a recycled base oil obtained by treating waste oil by a rerefining process. They are,
Mainly, the quality grade is not so high, and its performance is not fully grasped at present.

On the other hand, with the recent increase in engine speed and output, the required quality grade of engine oil in the market is
It is increasing gradually.

High quality engine oils such as S
H (One of the engine oil service categories established by the American Petroleum Institute (API), which currently has the highest quality grade)
Oil or SG (of the same classification as SH above,
Oil, which has the second highest quality grade after H, requires extremely strict engine performance, but commercially available engine oils that use regenerated base oil also do not have satisfactory performance in engine tests under strict conditions.

In particular, in the high temperature oxidation stability test (for example, the M333-93 method engine test prescribed by the Society of Automotive Engineers of Japan), the problem remarkably appears, and when the additive of the same package is used, regenerated base oil is used. It has been confirmed that the engine oil used shows a viscosity increase more than double that of the engine oil using the virgin base oil.

In view of the above circumstances, it is an object of the present invention to provide a regenerated lubricating oil composition exhibiting high temperature oxidation stability equivalent to that of virgin base oil even under extremely severe conditions.

[0007]

Means for Solving the Problems As a result of intensive studies conducted by the present inventors for the purpose of improving high temperature oxidation stability of regenerated base oil,
Although it is not possible to increase the high temperature oxidation stability of regenerated base oils by increasing the amount of package additives or adding antioxidants, addition of certain specific metal-type detergents used to prevent engine fouling It was found to be extremely effective in achieving the above-mentioned object, and the present invention has been completed.

That is, the regenerated lubricating oil composition of the present invention is
A base number of 400 is added to the recycled base oil obtained by re-refining the used lubricating oil.
It is characterized by adding 0.1 to 5% by weight of an alkaline earth metal sulfonate or an alkaline earth metal salicylate or a mixture of both of mgKOH / g or less.

Alkaline earth metal sulfonates and alkaline earth metal salicylates, which are essential components of the present invention, have various base numbers, but in the present invention, in order to improve the high temperature oxidation stability, Base number 400mgK
OH / g or less, preferably about 300 mg KOH / g or less is used. The lower limit of the base number is not particularly limited, and a neutral type can also be used.

The alkaline earth metal sulfonate is an alkaline earth metal salt of a sulfonate of a lubricating oil having a molecular weight of 400 to 600 or a synthetically alkyl-substituted aromatic compound, and calcium, magnesium or barium salt is preferably used. It

Typical examples of alkaline earth metal salicylates include calcium salts and magnesium salts. Generally, phenol is alkylated with an α-olefin having 14 to 18 carbon atoms to give an alkyl metal salt, which is subjected to Kolbe-Schmidt reaction. An alkaline earth metal salt is used by introducing a carboxyl group in the compound and metathesis etc.
No. 24560, Japanese Patent Publication No. 61-24651, etc.).

These alkaline earth metal sulfonates and alkaline earth metal salicylates have a base number of 30.
It may be overbased from 0 mgKOH / g to 400 mgKOH / g, but if the base number exceeds 400 mgKOH / g, the ash content in the engine oil will increase, resulting in an increase in combustion chamber deposits and clogging of the catalytic converter. It becomes a cause. Base number 300 mgKOH / g to 400 mgKOH /
The overbased form of g is produced, for example, by treating the neutral form with carbon dioxide (see US Pat. No. 3,057,896).

The alkaline earth metal sulfonate or alkaline earth metal salicylate, or a mixture of both, is generally added in an amount of 0.1 to 5% by weight, preferably 0.5 to 2% by weight, based on the recycled base oil. To be done. If the blending ratio is too small, the blending effect does not appear, and conversely, if too much,
The compounding effect cannot be improved, resulting in an increase in cost, which is economically disadvantageous.

The regenerated base oil containing the above-mentioned alkaline earth metal sulfonate and alkaline earth metal salicylate has the properties shown in Table 1. The regenerated base oil is obtained by refining a used lubricating oil. However, the used degree of the used lubricating oil may be any. However, it is preferable to use the lubricating oil which has been used for a certain amount or more and is not used for costly re-refining with a slight use, and preferable properties are shown in Table 2.

[0015]

[Table 1]

[0016]

[Table 2]

As a typical lubricating oil re-refining process method,
Sulfate clay method, French IFP (Institute
IFP developed by France Petroleum)
Method, Snapprogetti method developed by Sigmaprogetti of Italy (abbreviated as "S method"), PROP (Philli) developed by Phillips of the US
ps Re-refined Oil Procedures
s) method, Ever developed by Evergreen, Inc.
The green method (abbreviated as “E method”) and the like can be mentioned.

Each of these re-refining processes is composed of three steps of pretreatment, main treatment and posttreatment, and is carried out, for example, in a combination as shown in Table 3.

[0019]

[Table 3]

The regenerated lubricating oil composition of the present invention has the properties shown in Table 4, in addition to the above-mentioned regenerated base oil, alkaline earth metal sulfonate, and alkaline earth metal salicylate, for example, as shown in Table 5. It is preferable to add a package additive having various components.

[0021]

[Table 4]

[0022]

[Table 5]

The package additive is 0.01 to 0.23 wt% based on the phosphorus content, preferably 0.05 to 0.
17 wt%, more preferably 0.07 to 0.15 wt
%, Particularly preferably 0.10 to 0.13 wt% can be added. That is, in the case of a package additive having a phosphorus content of 1.1 wt%, 1 to 20 wt%, preferably 5-1
5 wt%, more preferably 7 to 12 wt%, and particularly preferably 9 to 11.8 wt% will be added.

Base number 400 mg which is an essential component of the present invention
It is preferable that the alkaline earth metal sulfonate or the alkaline earth metal salicylate having a KOH / g or less or a mixture of both is added in the following ratio with the above package additive. That is, assuming that the total phosphorus content of the package additive is 0.12 wt%, the total base number of the alkaline earth metal sulfonate, the alkaline earth metal salicylate, or the mixture of both is 1 to 1% by weight.
5 mgKOH / g, preferably 1.5-4 mgKOH /
g, more preferably 2.0 to 3.5 mg KOH / g,
Particularly preferably, it may be added in an amount of 2.5 to 3.0 mgKOH / g.

In addition to the above, metal type detergents such as alkaline earth metal phenates and alkaline earth metal phosphonates; antioxidation of zinc dialkyldithiophosphate, phenol, other aromatics, amines, etc. Agents; antifoaming agents such as silicone oils; can also be added.

Further, an alkenyl succinimide, a derivative thereof, a polyolefin having a molecular weight of 300 to 3000 is reacted with maleic anhydride and then imidized with polyamine, or the obtained imide is treated with an aromatic polycarboxylic acid. What was left to react to partially amidate the remaining amino groups (for example, polybutene having a molecular weight of 900 was reacted with maleic anhydride and then imidized with tetraethylenepentamine, or melitic acid was allowed to act on it. Dispersants such as those mentioned above) can also be added. In addition to these, various additives can be appropriately mixed.

[0027]

【Example】

Examples 1 to 14 and Comparative Examples 1 to 13 The respective components were mixed in the proportions shown in Tables 9 to 19 to obtain regenerated lubricating oil compositions of Examples 1 to 18 and Comparative Examples 1 to 13. With respect to the compositions of each of these Examples and Comparative Examples, the high temperature oxidation stability performance was evaluated by the JIS K2514 lubricating oil oxidation stability test method, and the results are shown in Tables 9 to 19.
Are shown together with.

The blending ratios in Tables 9 to 19 are% by weight.
It is indicated by. In Tables 9 to 19, * 1 to * 10 are
It is as follows. * 1, * 2: Overseas commercially available regenerated base oil (equivalent to 150 neutral) with properties shown in Table 6 * 3: Properties and composition shown in Table 7 * 4: Base number 170 * 5: Base number 300 * 6: Viscosity index improver * 7: Solvent refined mineral oil (150 neutral) with virgin base oil having the properties shown in Table 8 with a typical value here * 8: Base number 250 * 9: Base number 395 * 10: Base number 25

[0029]

[Table 6]

[0030]

[Table 7]

[0031]

[Table 8]

[0032]

[Table 9]

[0033]

[Table 10]

[0034]

[Table 11]

[0035]

[Table 12]

[0036]

[Table 13]

[0037]

[Table 14]

[0038]

[Table 15]

[0039]

[Table 16]

[0040]

[Table 17]

[0041]

[Table 18]

[0042]

[Table 19]

[0043]

As described in detail above, according to the regenerated lubricating oil composition of the present invention, even though the regenerated base oil is used, it exhibits excellent oxidation stability performance equivalent to that of the virgin base oil. can do. When the regenerated lubricating oil composition of the present invention is used, a high quality grade engine oil can be produced despite the fact that a regenerated base oil is used in the composition, and it is also environmentally friendly and resource saving. It is possible to obtain an additional effect that engine oil that can sufficiently meet the demands of the times can be provided.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location C10M 139: 06) C10N 30:04 30:08 30:10 40:25

Claims (1)

[Claims] 1. A regenerated base oil obtained by re-refining a used lubricating oil contains 0.1 to 5% by weight of an alkaline earth metal sulfonate or an alkaline earth metal salicylate having a base number of 400 mgKOH / g or less, or a mixture of both. A regenerated lubricating oil composition comprising: