ADDITIVE FOR LUBRICATING OIL, AND LUBIRICATING OIL COMPOSITION

Abstract

Object

There found a demand for ashless type novel lubricant which does not contain phosphorus, sulfur or metals and has high friction reducing effect, and suppresses the generation of deposit/sludge and the like, and furthermore can exhibit a detergency effect. It is an object to provide a novel lubricant capable of responding to this demand.

In addition, it was found out that it is required to demonstrate performances such as friction reduction effect and detergent effect under various low temperature and high temperature environments. In the present invention, it is also an object to provide a novel lubricant which can exhibit excellent performance even under various low temperature and high temperature environments even at the higher dosage.

Solution

A lubricating oil/grease additive characterized by containing a polyetheramine carboxylic acid salt represented by the general formula (1).

[R.sub.1COO.sup.][R.sub.2O(AO)m-X.sup.+](1)

Here, the carboxylic acid is a carboxylic acid having carbon number R.sub.1=7-21, preferably carboxylic acid having carbon number R.sub.1=7-19, more preferably oleic acid R.sub.1=C17.

R.sub.2 is a hydrocarbon group of carbon number from 8 to 50, A is an alkyl group of carbon number from 2 to 6, O is oxygen, m is an integer of 10 to 50, and X is an amino group or a substituted amino group.

Claims

1. An additive for a lubricant comprising a polyetheramine carboxylic acid salt represented by the following general formula (1),
[R1-COO][R2-O(AO)m-X+](1) wherein R1 is a hydrocarbon residue of a carbon number of 7 to 21, the polyetheramine moiety having a base moiety is a compound represented by R2-O (AO) m-X, in the formula (1), R2 is a hydrocarbon residue of a carbon number of 8 to 50, A is an alkylene group of a carbon number of 2 to 6, O is oxygen, m is an integer of 10 to 50, and X is a hydrocarbon containing an amino group or a substituted amino group, where X is (C3H6NH)nH, and n is an integer of 1 to 3.

2. The additive for a lubricant according to claim 1, comprising a polyoxyalkylene alkylamine represented by the following general formula (2),
R3-N(BO)aH(BO)bH(2) wherein, in the formula (2), R3 represents an alkyl group or an alkenyl group of a carbon number of 6 to 24, a and b each represent a mean degree of polymerization, a and b each represent an integer of 1 or more, and a+b represents an integer of 1 to 30, and B is an alkylene group of a carbon number of 2 to 4.

3. The additive for a lubricant according to claim 1, wherein n=1 in X.

4. The additive for a lubricant according to claim 2, wherein R3 is an aliphatic hydrocarbon group of a carbon number of 10 to 18.

5. The additive for a lubricant according to claim 2, wherein a+b is 2 to 4.

6. A lubricant composition containing an additive according to claim 1, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

7. The additive for a lubricant according to claim 2, wherein n=1 in X.

8. The additive for a lubricant according to claim 3, wherein R3 is an aliphatic hydrocarbon group of a carbon number of 10 to 18.

9. The additive for a lubricant according to claim 7, wherein R3 is an aliphatic hydrocarbon group of a carbon number of 10 to 18.

10. The additive for a lubricant according to claim 3, wherein a+b is 2 to 4.

11. The additive for a lubricant according to claim 4, wherein a+b is 2 to 4.

12. The additive for a lubricant according to claim 7, wherein a+b is 2 to 4.

13. The additive for a lubricant according to claim 8, wherein a+b is 2 to 4.

14. The additive for a lubricant according to claim 9, wherein a+b is 2 to 4.

15. A lubricant composition containing an additive according to claim 2, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

16. A lubricant composition containing an additive according to claim 3, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

17. A lubricant composition containing an additive according to claim 4, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

18. A lubricant composition containing an additive according to claim 5, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

19. A lubricant composition containing an additive according to claim 7, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

20. A lubricant composition containing an additive according to claim 8, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

21. A lubricant composition containing an additive according to claim 9, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

22. A lubricant composition containing an additive according to claim 10, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

23. A lubricant composition containing an additive according to claim 11, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

24. A lubricant composition containing an additive according to claim 12, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

25. A lubricant composition containing an additive according to claim 13, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

26. A lubricant composition containing an additive according to claim 14, which is used for all lubricants, such as engine oil for internal combustion engines, transmission oil, gear oil, grease, and hydraulic oil.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0068] FIG. 1 is a figure showing a configuration of a screw jack used for evaluating friction characteristics of grease (Example 5).

[0069] FIG. 2 is a figure showing a configuration of a relief valve used for evaluating sludge generation (Example 7).

EMBODIMENTS OF THE INVENTION

[0070] In the following, preferred embodiments of the present invention will be described with reference to examples.

[0071] All of the following examples were carried out mainly by combining polyetheramine carboxylic acid salt and polyoxyethylene alkylamine which are highly effective combined.

[0072] Even when the molecular structure of each combination is changed, the same performance was exhibited. Especially, regarding the polyetheramine carboxylic acid formation, it was confirmed the change of absorption of reaction by using FT-IR of JASCO, when producing salt.

[0073] While preparing all the salts, when carboxylic acid is added to the polyetheramine and stirred, the absorbance at 1720 to 1700 cm-1 from the bond of CO peculiar to the carboxylic acid remarkably disappeared and shifted, as the salt is gradually formed. Also, the formation of polyetheramine carboxylic acid salt with surety was confirmed, we were going to annihilate and shift, and then evaluated.

Example 1

<Evaluation of Low Temperature Characteristics>

[0074]

TABLE-US-00001 TABLE 1 Low Temperature Properties of Carboxylic Acid Simple Substance, and Polyetheramine Carboxylic Acid Salt Sample Temperature No. Sample Name CXX 20 C. 0 C. 20 1 Caprylic acid C7 Liquid Solid Solid 2 Lauric acid C11 Solid Solid Solid 3 Palmitic acid C15 Solid Solid Solid 4 Linoleic acid C17 Liquid Liquid Solid 5 Oleic acid C17 Liquid Solid Solid 6 Behenic acid C21 Solid Solid Solid 7 PEA Liquid Liquid Liquid 8 PEA + Caprylic acid C7 Liquid Liquid Liquid 9 PEA + Lauric acid C11 Liquid Liquid Liquid 10 PEA + Palmitic acid C15 Liquid Liquid Liquid 11 PEA + Linoleic acid C17 Liquid Liquid Liquid 12 PEA + Oleic acid C17 Liquid Liquid Liquid 13 PEA + Behenic acid C21 Liquid Liquid Semi- solid

[0075] In Table 1, solid includes powder crystals. Semi-solid is a state in which fluidity remains.

CXX is the carbon number excluding the carbon of the carboxylic acid group.

[0076] PEA is, R.sub.2=13, A=4, m=20, X uses n=1. The same result was obtained even if R.sub.2=8, A=2, X was changed to n=2, etc. PEA behenic acid is also liquid at by 10 C.

[0077] For PEA, those with R.sub.2=13 (carbon number 13) are derived from branched tridecanol=(CH 3 CH (CH 3) ((CH 2 CH (CH 3)) 2 CH (CH 3) (CH 2) 2 OH) synthesized by the oxo method.

[0078] Note that PEA has the following structural formula.

##STR00001##

[0079] Moreover, as for the one with R2=8 (carbon number 8), PEA containing octanol=n-octanol (CH 3 (CH 2) 7 OH) and 2-ethylhexanol (CH 3 (CH 2) 3 CH (C 2 H 5) CH 2 OH) was used.

[0080] As is apparent from the above Table 1, while the carboxylic acid alone is a solid at ordinary temperature or low temperature, the polyetheramine carboxylic acid salt (Samples 8 to 13) is in liquid or semi-solid state even at low temperature. This and also high low temperature property was confirmed. As a result, precipitation and sediment does not occur in oil even at low temperature, and it becomes possible to use it at a high concentration.

Example 2

<Evaluation of Friction Reduction Effect>

Hydraulic Oil:

[0081] First, as a hydraulic fluid, add only zinc dithiophosphate (ZnDTP) to the base oil VG 32 to prepare a simple one so that the friction reduction effect is not affected by other additives. Add 2.0 w/w % each of carboxylic acid to this, and add polyether amine simple substance having the same amine value as the neutralization value of each these carboxylic acids to this and add polyetheramine carboxylic acid salt reacted with same amount of these carboxylic acids to this. And then, compared the forces when beginning to move the hydraulic cylinder.

[0082] The friction containing ZnDTP as the base is assumed to be 100, and the force required with reference to this 100 is represented by a numerical value.

TABLE-US-00002 TABLE 2 Evaluation of Friction Characteristics in Application to Hydraulic Oil Cylinder Sample No. Sample Name CXX Friction 1 Hydraulic oil (ZnDTP) 100 2 Hydraulic oil + PEA 100 3 Hydraulic oil + Caprylic acid C7 99 4 Hydraulic oil + PEA Caprylic Acid Salt C7 97 5 Hydraulic oil + Oleic acid C17 94 6 Hydraulic oil + PEA Oleic Acid Salt C17 88 7 Hydraulic oil + Behenic acid C21 98 8 Hydraulic oil + PEA Behenic Acid Salt C21 96 9 Hydraulic oil + GMO 93 10 Hydraulic oil + GMO + PEA 93 11 Hydraulic oil + PEA Oleic Acid C17 87 Salt + POEAA

[0083] In Table 2, CXX is the carbon number excluding the carbon of the carboxylic acid group.

[0084] As in Sample 10 in Table 2, the combination of 2.0 w/w % glycerol monooleate (GMO) alone, which is a general friction modifier alone, with polyether amine alone was also evaluated. Synergistic effect by combination with PEA was not observed. Whereas in samples 4, 6 and 8, it was confirmed that polyether carboxylic acid salt has friction reducing effect more than carboxylic acid alone. From this, it can be seen that the polyetheramine carboxylic acid salt itself has a friction reducing effect.

[0085] At the same time, when PEA oleic acid salt (fatty acid containing at least 80% of oleic acid) is added, as shown in Sample 6, there is higher effect of friction reduction compared to the GMO, which is said to reduce the friction the most among conventional products. The PEA used here was R.sub.2=13, A=4, m=20, X=n=1, and ZnDTP was LZ 1375 manufactured by Lubrizol Corporation, and base oil was the mineral oil with viscosity grade of VG 32.

[0086] Furthermore, as shown in Sample 11, when polyoxyethylene lauryl amine of 5.0 w/w % was added to the polyether amine oleic acid salt, further synergistic effect was obtained to reduce friction.

Example 3

<Fuel Saving Effect in Application to Engine Oil>

[0087] To prevent the influence of other additives in the engine oil, PEA, fatty acid containing 80% oleic acid, and same PEA salt with fatty acid containing 80% oleic acid were each added to the base oil (ester 100%: addition of only viscosity index improver+ZnDTP: LZ 1375 to Kao Lube 262) to measure each fuel consumption. The dosage is 1.0 w/w % of the fatty acid simple substance, PEA with the amine value same as the neutralization value thereof, and a complete salt by the two.

[0088] A PEA with R.sub.2=13, A=4, m=20, and X=n=1 was used.

[0089] The test vehicles, two Honda PCX, 150/125, ran a 250 km round trip to and from the same route. The average value of four tests was sought.

[0090] Measurement was carried out at an ambient temperature of 20 to 25 C. so that there was no change in the engine oil temperature.

TABLE-US-00003 TABLE 3 Improvement of Fuel Efficiency by Engine Oil Fuel Economy Sample No. Sample Name Improve Rate (%) 1 Engine Oil 0% 2 Engine Oil + PEA 0% 3 Engine Oil + Oleic Acid 4.20% 4 Engine Oil + PEA Oleic Acid Salt 5.80%

[0091] As is apparent from Table 3, it was confirmed that the highest fuel efficiency improvement rate can be obtained from the use of the engine oil to which the PEA salt of Sample 4 is added. Further, it was confirmed that Sample 4 can obtain a higher fuel efficiency improvement rate than Sample 3 with oleic acid added.

Example 4

<Friction Reduction Effect in Application to Gear Oil>

<TABLE 4> Drive Torque Reduction of L-Type Spiral Gear

[0092] In case of gear oil, it is difficult to measure its friction characteristics from common gears, and at the same time, in order to eliminate the influence of stirring resistance and the like, L type spiral gear is used so that the slip (friction resistance) of the gear can be more easily understood. Measurement was carried out with a torque that is driven with 90% of the maximum load capacity of the allowable torque applied.

<Test Gear Data>

[0093] Accuracy grade: JIS N 9 grade (JIS B 1702-1: 1998)

[0094] Gear reference cross section: tooth right angle

[0095] Tooth form: parallel tooth

[0096] Right angular pressure angle: 20

[0097] Twist angle: 45

[0098] Module m: 4

[0099] Allowable torque Nm: 25.1

[0100] Since the spiral gear itself causes slippage on the tooth surface, the friction characteristic becomes clearer.

TABLE-US-00004 TABLE 4 Drive Torque Reduction Effect of L-type Spiral Gear Drive Torque Sample No. Sample Name Reduction Rate (%) 1 Gear Oil 100% 2 Gear Oil + PEA 100% 3 Gear Oil + Oleic Acid 98% 4 Gear Oil + PEA Oleic Acid Salt 96%

[0101] Gear oil used is GL-4: number 80, and PEA used is R.sub.2=13, A=3, m=20 and X=n=1. As fatty acids, 1.0 w/w % of a mixture containing 80% oleic acid and 98% stearic acid in a ratio of 1:1, PEA having the same amine value as the neutralization value thereof, and complete salt of both added was used. The dosage as PEA oleic acid salt is about 8.5 w/w %.

[0102] As is clear from Table 4, it was confirmed that sample 4 added with PEA oleic salt obtained the highest friction reducing effect.

Example 5

<Effect in Application to Grease>

[0103] The friction characteristics of the grease were compared with the torque at the starting of operation by hanging the weight of the maximum load on the screw jack having the same structure as in FIG. 1.

TABLE-US-00005 TABLE 5 Friction Reducing Evaluation by Application to Grease Sample No. Sample Name Friction Reduction Rate 1 Grease 100% 2 Grease + PEA 100% 3 Grease + Oleic Acid 97% 4 Grease + PEA Oleic Acid Salt 94%

[0104] For grease, a commercially available product #2 containing molybdenum was used. The fatty acids were evaluated by adding crude oleic acid 3%: 10% of C14 to C20 and 90% Of C14F1 to C18F2, PEA having an amine value equivalent to the neutralization value of crude oleic acid, and salts of both. PEA used was R.sub.2=13, A=4, m=20, and X=n=1.

[0105] The value of friction in the case of grease itself without additives is assumed to be 100%, and the evaluation is expressed numerically by comparison with it. The dosage as PEA oleic acid salt is 5.0 w/w %.

[0106] As is apparent from Table 5, it was confirmed that Sample 4 added with PEA oleic salt obtained the highest friction reducing effect.

Example 6

[0107]

TABLE-US-00006 TABLE 6 Change in Friction Characteristics by Grease Sample Normal CVJ Worn CVJ No. Sample Name Chatter Noise Chatter Noise 1 Grease A 2 Grease A + PEA 3 Grease A + Oleic Acid 4 Grease A + PEA Oleic Acid Salt 5 Grease B X X 6 Grease B + PEA X X 7 Grease B + Oleic Acid X 8 Grease B + PEA Oleic Acid Salt Legend: X = remarkable chatter can be confirmed = chattering can be confirmed = chattering can hardly be confirmed = chattering can not be confirmed at all Grease A: genuine CV joint grease Grease B: General grease containing molybdenum disulfide Fatty acid: Contains 80% oleic acid PEA: PEA with R.sub.2 = 13, A = 4, m = 20, X = n = 1 is used. PEA fatty acid salt has a proportion that it becomes a complete salt as well as others. In the test, using the Daihatsu Mira Turbo, the rear wheel axle was locked, and with the steering wheel turned off until the front wheel locked, the driving force was given at a stroke and the vibration occurring in the constant velocity joint (CVJ) was confirmed. Evaluation was carried out using both a normal constant velocity joint (CVJ) and a worn joint (CVJ). The dosage of PEA oleic acid salt is 4.2 w/w %.

[0108] As is apparent from Table 6, the sample 4 added with PEA oleic acid salt confirmed the best result against chatter occurrence. Regarding the constant velocity joint (CVJ), it was confirmed that friction reduction can be achieved not only for normal one but also for worn ones, so it can be said that it is suitable for operation using Sample 4 at maintenance.

Example 7

Sludge Evaluation: Sludge Evaluation in Hydraulic Fluid

[0109]

TABLE-US-00007 TABLE 7 Sludge Formation and Sludge Removal Performance in Hydraulic Fluid Sample Sludge No. Sample Name Generation Sludge Removal 1 Hydraulic Fluid A XX Generated X Cannot be Removed a lot 2 Hydraulic Fluid A + Partially Partially removed PEA Generated 3 Hydraulic Fluid A + X Generated X Cannot be Removed Oleic Acid 4 Hydraulic Fluid A + Almost No Remove Perfectly PEA Oleic Acid Salt Generation 5 Hydraulic Fluid B A Little X Cannot be Removed Generated 6 Hydraulic Fluid B + A Little Almost Removed PEA Generated 7 Hydraulic Fluid B + X Generated X Cannot be Removed Oleic Acid 8 Hydraulic Fluid B + Generate Not Remove Perfectly PEA Oleic Acid Salt At All Hydraulic fluid A: (VG 32) Common hydraulic fluid not containing dispersant Hydraulic fluid B: (VG 32) containing dispersant. Dispersant is succinimide type The fatty acid is a fatty acid containing 80% oleic acid PEA is R.sub.2 = 13, A = 4, m = 20, X is n = 1 The dosage was 0.5 w/w % for the fatty acid, PEA of it was the same amine value as the neutralization value of the fatty acid, and PEA fatty acid salt of it was produced salts with these two amounts. The dosage as PEA oleic acid salt is 4.2 w/w %.

[0110] In the sludge formation test, the relief pressure valve as shown in FIG. 2 was set to a hydraulic pressure of 210 kg/cm 2, the relief valve was operated by a hydraulic pump, 5 liters of hydraulic oil was circulated, the oil temperature was raised to 70 C. and the operation was carried out for one week, The relief pressure valve in the relief valve was taken out and the surface was observed with a metallurgical microscope and evaluated.

[0111] Sludge removal was evaluated in the same way using 20 liters of hydraulic fluid which the oil temperature was kept at 50 C. and using sludge formation under the same condition.

[0112] As is clear from Table 7, it was confirmed that in Samples 4 and 8 using PEA oleic acid salt, generation of sludge was suppressed and sludge removal was also possible.

Example 8

Evaluation of Deposit and Sludge in Engine Oil

[0113]

TABLE-US-00008 TABLE 8 Engine Oil Deposit Circumference Sample above No. Sample Nama EGR Pipe Piston Ring CCD Sludge 1 Oil X XDeposit X All Around 2 Oil + PEA Partial Deposit, a Little 3 Oil + Oleic Acid X XDeposit XX X all Around 4 Oil + PEA Oleic Little Acid Salt Deposit 5 Oil + PEA Oleic No Deposit Acid Salt + POEAA Evaluation of EGR piping: X = Dry deposit occurrence = Somewhat soft deposit, = Soft dirt that can be wiped off easily, not deposited. Evaluation of CCD: XX = Generation of slightly thick deposit on the entire upper surface of the piston, X = Deposit on the entire upper surface of the piston, = Deposit at the center part of the piston, slightly occurring around the circumference, = A slight deposit around the center part, = No deposit occurred Evaluation of sludge: amount of varnish on the back side of the piston: X = brown varnish, = yellow varnish, = slight color can be seen, = metallic color and no varnish.

[0114] The dirt in the EGR piping is a comprehensive evaluation of the running test by the actual vehicle using the following. Peugeot DW10 common rail diesel engine: engine oil=Total QUARTS INEO ECS 5W-30, and Mazda Demio 1.3 L direct injection: engine oil=Mazda genuine GOLDEN ECO 0W-20 SN.

[0115] Deposit at the upper circumference of the piston ring: CCD, sludge evaluation was evaluated after 100 hours of testing by disassembling of the engine using a Subaru generator: engine oil=Subaru genuine 5W-30 SJ and evaluated.

[0116] The fatty acid is a commercially available fatty acid containing 80% oleic acid.

[0117] PEA is R.sub.2=13, A=4, m=20, X=n=1.

[0118] The dosage is 0.5 w/w % of the fatty acid, PEA of it is the same amine value as the neutralization value of the fatty acid, and PEA fatty acid salt of it is a salt made by both amounts.

[0119] The dosage of PEA oleic acid salt is approximately 4.2 w/w % under the above conditions.

[0120] POEAA is a polyoxyethylene alkylamines, a+b=2, and with a mixture of R.sub.3=C 8: 8%, C 10: 7%, 12: 48%, C 14: 18%, C 18: 9%. The dosage is 20.0 w/w % based on PEA oleic acid salt.

[0121] In addition, oil+POEAA alone cannot be evaluated because the engine oil gels.

[0122] As is apparent from the above Table 8, it was confirmed that the deposits and sludge formation (burnish amount) was suppressed in Samples 4 and 5 using PEA oleic acid salt.

Example 9

Engine Oil Stability Test

[0123]

TABLE-US-00009 TABLE 9 Engine Oil Stability Test Sample Storage stability No. Sample Name Storage Stability after 1000 km 1 Oil + PEA Clear Clear 2 Oil + Oleic Acid Precipitation Precipitation 3 Oil + PEA Oleic Acid Haze Precipitation Salt 4 Oil + PEA Oleic Acid Clear Clear Salt + POEAA 5 Oil + POEAA Gelled Gelled

[0124] Storage stability test was stored at 3040 C., and confirmed after 1 month.

[0125] The same results were obtained for each various gasoline genuine oil, API-SN grade oil: Mazda genuine GOLDEN ECO 0W-20, Honda genuine S9 10W-30, diesel oil: ACEAE C2A5/B5 Total QUARTS INEO ECS 5W-30. In the evaluation, the same additives as in the above engine oil deposit test were added at the same dosage and evaluated.

[0126] As is apparent from Table 9, all of the engine oil contains overbased metal sulfonate/phenate and the like. As the result, precipitation occurs both engine oil with carboxylic acid alone as the matter of cause and polyetheramine carboxylic acid salt in Samples 2 and 3. However, it was confirmed that no precipitation occurred in Sample 4 in which POEAA was added to the polyetheramine carboxylic acid salt.

[0127] On the other hand, when POEAA alone is added to the engine oil, it is known that the engine seizure will occur in the worst case. However, when POEAA alone was added to the engine oil in the storage stability test conducted this time, this gelation phenomenon was confirmed. In this respect, it was confirmed that this gelation did not occur in POEEA in combination with polyether carboxylic acid salt as Sample 4.

[0128] As is apparent from the above Examples, in each of the samples in which the carboxylic acid was added to the polyetheramine, all the oil-based lubricants showed different performances from those containing the individual components, and the detergency, the lubricating performance, and the effect of suppressing sludge formation on the metal surface was produced. At the same time, it can be seen on the polyetheramine carboxylic acid salt combined with polyoxyalkylene alkyl amine that detergency and lubricating performance are improved.

[0129] As described above, the present invention can be implemented.

[0130] That is,

the present invention provides an additive for a lubricating oil formula comprising a polyetheramine carboxylic acid salt represented by the following general formula (1).

[R.sub.1COO.sup.][R.sub.2O(AO).sub.mX.sup.+](1)

R.sub.1 is a hydrocarbon residue of a carbon number of 7-21.
The polyetheramine moiety having a base moiety is a compound represented by R.sub.2O(AO)m-X.
In the formula (1), R.sub.2 is a hydrocarbon residue of a carbon number of 8 to 50, A is an alkylene group of a carbon number of to 6, O is oxygen, m is an integer of 10 to 50, X is a hydrocarbon containing an amino group or a substituted amino group,
X is (C.sub.3H.sub.6NH) n H, and
n is an integer of 1 to 3.

[0131] It is used as additive for lubricant.

[0132] In addition, the present invention provides additives for lubricant comprising a polyoxyalkylene alkylamine represented by the following general formula (2) in the polyetheramine carboxylic acid salt represented by the above general formula (1).

R.sub.3N(BO)aH(BO)bH(2)

[0133] In the formula (2), R.sub.3 represents an alkyl group or an alkenyl group of a carbon number of 6 to 24,

[0134] a and b each represents an average degree of polymerization, a and b each represents an integer of 1 or more, a+b represents an integer of 1 to 30, and

[0135] B is an alkylene group of a carbon number of 2 to 4.

[0136] Also, n can be 1 in X.

[0137] Also, R.sub.3 can be an aliphatic hydrocarbon group of a carbon number of 10 to 18.

[0138] Also, a+b can be 2 to 4.

[0139] Also, the present invention provides a lubricant composition containing the above additive for a lubricant formula, which is used for all lubricants, such as

[0140] engine oil for internal combustion engine,

[0141] transmission oil,

[0142] gear oil,

[0143] grease, and

[0144] hydraulic oil.