JPH10130679A - Lubricant composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a compsn., such as a lubricant or grease, excellent in abrasion resistance and extreme-pressure properties by incorporating a sulfur-contg. organotin compd. into the same. SOLUTION: A pref. sulfur-contg. organotin compd. is selected from among compds. represented by the formula: (R<1> )m Sn(X)4-m [wherein R<1> is an alkyl; X is S(CH2 )n cCOOR<2> or S(CH2 )n OCOR<2> (wherein R<2> is an alkyl or an alkenyl; and (n) is 1-18); and (m) is 0-3]. Examples of the compd. are dimethyltinbis(isooctylthioglycol) and monomethyltin tris(2-mercatoethyl oleate). Pref., the compd. is compounded in an amt. of 0.1-2wt.% of the compsn. Examples of a lubricant compsn. are a mineral oil, an Li-soap grease, a urea grease, and a composite Ca-soap grease.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a lubricant composition such as lubricating oil and grease, and more particularly to a lubricant composition containing a sulfur-containing organotin compound having excellent load bearing capacity.

[0002]

2. Description of the Related Art It is known to add an organotin compound to a lubricant composition such as a lubricating oil or grease to improve its wear resistance and friction resistance. For example, JP-A-55-165
No. 997 discloses a lubricant to which an organotin compound represented by the general formula R-SnXYZ (where R represents an alkyl group, X, Y and Z represent an alkyl group, an acyloxy group and an alkoxycarbonylacyloxy group) is added. A composition is described. However, the effect of improving the abrasion resistance was not sufficient.

[0003]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a lubricant composition having excellent wear resistance and extreme pressure.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is achieved by a lubricant composition containing a sulfur-containing organotin compound.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred sulfur-containing organotin compounds used in the present invention are selected from those represented by the following formula (1). (1) (R ¹ ) _m Sn (X) _{4-m In the} formula, R ¹ represents an alkyl group, and X represents —S— (C
_{H 2) n-CO-OR} 2 or -S- (CH ₂₎ n-O-
Represents CO-R ² , R ² represents an alkyl group or an alkenyl group, n represents an integer of 1 to 18, m represents an integer of 0 to 3, when two or more of R ¹ and X are present, , May be the same or different. Preferred as the alkyl group represented by R ¹ are those having 1 to 18 carbon atoms, for example,
Methyl, butyl, octyl, octadecyl and the like. R
Preferred as the alkyl group and the alkenyl group represented by ² are those having 1 to 18 carbon atoms, for example, methyl,
Octyl, dodecyl, octadecyl, oleyl and the like.

More specific examples include the following compounds. Compound A dimethyltin bis (isooctyl _{thioglycolate) (CH 3) 2 -Sn- (} S-CH 2 CO-O-isoC
₈ H _{17) 2} compound B monomethyl tin tris (isooctyl _{thioglycolate) CH 3 -Sn- (S-CH} 2 CO-O-isoC
₈ H _{17) 3} Compound C-di (n- octyl) tin bis (isooctyl _{mercaptoacetate) (n-C 8 H 17} ) 2 -Sn- (S-CH 2 CO-O-i
soC ₈ H _{17) 2} Compound D monomethyl tin tris (2-mercaptoethyl _{oleate) CH 3 -Sn- (S- (CH} 2) 2 O-CO-C
₁₈ H _{35) 3} Compound E dimethyltin bis (2-mercaptoethyl _{oleate) (CH 3) 2 -Sn- (} S- (CH 2) 2 O-CO-C
₁₈ H _{35) 2}

As the lubricant composition of the present invention, lubricating oils such as gear oils, engine oils, hydraulic oils, working oils, etc., greases for bearings, greases for various industrial machines, which are required to have load resistance and extreme pressure properties, are used. The above-mentioned load-bearing additive is added to grease such as grease for an automobile constant velocity joint, in an amount of 0.1 to 20% by weight, preferably 0.5 to 20% by weight based on the total weight of the lubricant composition.
Those containing 10% by weight are preferred. If the amount is less than 0.1% by weight, the desired effect is not sufficiently exhibited, and
If it exceeds 300, there is no effect according to the added amount, and the price becomes expensive, which is not practical. Specific examples of the lubricant composition of the present invention include mineral oil, Li soap grease, urea grease, composite Ca soap grease, and the like.

[0008] The lubricant composition of the present invention can be easily produced by adding a predetermined amount of an additive to the above lubricating oil and grease. The lubricant composition of the present invention may contain, in addition to the above additives, ordinary antioxidants, rust inhibitors, metal corrosion inhibitors, oil agents other than organotin represented by the general formula (1), abrasion modifiers, An additive such as an anti-loading additive represented by an extreme pressure agent or the like may be contained in a usual amount.

Hereinafter, the present invention will be described more specifically with reference to examples. Examples 1 and 2 and Comparative Examples 1 to 4 To 98 parts by weight of the base material shown in Table 1, 2 parts by weight of the following load-bearing additives were added and mixed to prepare a lubricant composition. For this composition, a high-speed four-ball load-bearing performance test (AS
TM D 2596) and the maximum non-seizing load (LNS
L .: Last Nonseizure Load), welding load (load that caused ultimate seizure, WP: Weld Point) and shell ball
The load wear index (LWI) was determined. Table 1 shows the results.

Example 1 Load-bearing additive used Example 1 75/25 (weight ratio) of compound A and compound B
Mixture Example 2 Compound C Comparative Example 1 Not added Comparative Example 2 Dioctyltin laurate (C ₈ H ₁₇ ) ₂ —Sn— (CO—O—C ₁₂ H ₂₅ ) ₂ Comparative Example 3 Dibutyltin laurate (C ₄ H ₉₎ ) ₂ -Sn- (CO-OC ₁₂ H ₂₅ ) ₂ Comparative Example 4 Zinc Dialkyldithiophosphate

[0011]

[Table 1] Example Comparative Example Base Item 1 2 1 2 3 4 Mineral oil LNSL 981 981 392 981 618 981 Kinematic viscosity: 101 mm ² / s @ 40 ° C WP 2452 2452 1569 1569 1236 1961 LWI 451 431 186 392 255 422 Li soap grease LNSL 981 784 490 490 618 - grade: No.2 WP 2452 1961 1236 1236 1236 - base oil: mineral oil LWI 441 353 206 206 255 - kinematic ^{viscosity: 101mm 2 / s @ 40 ℃} Li soap grease LNSL 981 - 490 − 618 − Grade: No.2 WP 2452 − 1236 − 1236 − Base oil: Synthetic hydrocarbon oil LWI 412 − 196 − 226 − Kinematic viscosity: 48 mm ² / sウ40 ° C urea grease LNSL 981 784 490 490 490 618 − Grade: No.2 WP 2452 1961 1236 1236 1236 − Base oil: Mineral oil LWI 441 353 353 206 235 255 − Kinematic viscosity: 130mm ² / s ℃ 40 ° C complex Ca soap grease Grade: No. 1 LNSL 1236 − 784 − 784 − Base oil: Mineral oil WP 3923 − 2452 − 3089 − Kinematic viscosity: 370 mm ² / s ＠ 40 ° C LWI 628 − 382 − 422 −

Examples 3 and 4 In Example 1, a composite Ca soap grease was used, and the addition amount of a load-bearing additive (a 75/25 (weight ratio) mixture of compound A and compound B) was 0.5% by weight. A high-speed four-ball load-bearing performance test was performed in exactly the same manner as in Example 1 except that the content was 10% by weight. The results are shown in Table 2 together with the results when the composite Ca soap grease of Example 1 was used (addition amount of load-bearing additive = 2% by weight).

[0013]

[Table 2] Example 3 14 Addition amount of load-bearing additive (%) 0.5 2.0 10.0 Composite Ca soap grease Item Grade: No. 1 LNSL 981 1236 1961 Base oil: Mineral oil WP 3089 3923 7846 Kinematic viscosity: 370 mm ² / s ＠ 40 ℃ LWI 431 628 961

The lubricant composition of the present invention to which a sulfur-containing organotin compound has been added is superior to those using a conventional load-bearing additive in terms of load-bearing properties, extreme pressure performance such as seizure and welding. You can see that there is.

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C10N 50:10

Claims (6)

[Claims] 1. A lubricant composition containing a sulfur-containing organotin compound. 2. The lubricant composition according to claim 1, wherein the sulfur-containing organotin compound is selected from those represented by the following formula (1). (1) (R ¹ ) _m Sn (X) _{4-m In the} formula, R ¹ represents an alkyl group, and X represents —S— (C
_{H 2) n-CO-OR} 2 or -S- (CH ₂₎ n-O-
Represents CO-R ² , R ² represents an alkyl group or an alkenyl group, n represents an integer of 1 to 18, m represents an integer of 0 to 3, when two or more of R ¹ and X are present, , May be the same or different. 3. The lubricant composition according to claim 1, which is grease. 4. The lubricant composition according to claim 3, which is a grease for an automotive constant velocity joint. 5. The sulfur-containing organotin compound is selected from the group consisting of dimethyltin bis (isooctylthioglycol), monomethyltin tris (isooctylthioglycol) and di (n-octyl) tin bis (isooctylmercaptoacetate). 5. At least one member selected from the group consisting of:
The lubricant composition according to any one of the above. 6. The composition according to claim 1, wherein the sulfur-containing organotin compound is contained in an amount of 0.1 to 20% by weight based on the total weight of the composition.
The lubricant composition according to any one of claims 1 to 5, wherein