JPH06212182A - Lubricating oil for 2-cycle engine - Google Patents

Abstract

PURPOSE:To obtain a lubricating oil for 2-cycle engine with excellent cleaning ability which is reduced in the generation of exhaust smoke, is excellent in engine start, and does not cause the clogging of an exhaust system with carbon, by using a specific poly(oxyalkylene glycol) derivative as the base. CONSTITUTION:The lubricating oil comprises as the base a poly(oxyalkylene glycol) derivative represented by the formula [wherein R<1> and R<2> each is H. a 1-22C alkyl, a 3-22C alkenyl, a 5-20C (alkyl)cycloalkyl, or a 3-20C (alkyl)aryl or arylalkyl; R<3> to R<6> each is H. CH3, or C2H5, provided that the sum of the carbon atoms of R<3> to R<6> is 1 or 2; and a is 1-20].

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lubricating oil for a two-cycle engine, and more specifically, it is a cleaning agent that produces extremely low exhaust smoke, has excellent engine startability, and prevents carbon clogging in the exhaust system. It relates to a lubricating oil for a two-cycle engine having excellent properties.

[0002]

2. Description of the Related Art In a two-cycle engine, unburned engine lubricating oil is discharged along with exhaust gas due to a lubricating mechanism, which causes smoke.

From the standpoint of environmental pollution, it is desired that the amount of smoke is as small as possible. In Japan, the smoke generation is less than that of mineral oil base oils, which is mainly composed of polybutene or polyisobutylene as a base oil. Lubricating oils for two-cycle engines are widely used in the market.

[0004]

However, since polybutene is an adhesive substance and causes a large friction between the piston and the cylinder, a decrease in engine output is inevitable as compared with the mineral oil base oil. Also, in the case of models with a small capacity for starting the cell motor, and models such as lawn mowers, chain saws, and generators that are recoil (starting method of winding a string around the crank pulley and pulling), it is difficult to start the engine, or There is a problem that it is difficult to operate.

Further, polybutene is said to be less likely to cause carbon clogging in the exhaust system than mineral oil, but in many cases of start-stop type running, for example, in a newspaper delivery motorcycle,
It is also reported that emulsion sludge is generated more than mineral oil at low temperatures. The clogging of the exhaust system with carbon or emulsion adversely affects the combustion of the engine and causes a reduction in output.

Therefore, a lubricating oil for a two-cycle engine, which has a small amount of smoke and is excellent in cleanliness, which improves engine output reduction, startability deterioration, and carbon clogging in the exhaust system, which is observed in smokeless oil such as polybutene, is provided. Development was required.

[0007]

Means for Solving the Problems As a result of repeated research to develop a lubricating oil suitable for a two-cycle engine, the present inventors have found that when a polyoxyalkylene glycol derivative having a specific structure is used as a base oil. , A smokeless type two-cycle engine lubricating oil with less engine output reduction, better startability, and no carbon blockage in the exhaust system compared to conventional commercially available two-cycle engine lubricating oils can be obtained. This has led to the completion of the present invention.

The contents of the present invention will be described in more detail below.

The present invention provides a lubricating oil for a two-cycle engine, which comprises a polyoxyalkylene glycol derivative represented by the general formula (1) as a base oil.

[0010]

[Chemical 4] In the formula, R ¹ and R ² may be the same or different,
Hydrogen, an alkyl group having 1 to 22 carbon atoms, and 3 carbon atoms, respectively
To 22 alkenyl groups, C5 to C20 cycloalkyl groups or alkylcycloalkyl groups, or C6 to C20 aryl groups, alkylaryl groups or arylalkyl groups, and specifically hydrogen: methyl group. , Ethyl, propyl, butyl, pentyl, hexyl, heptyl, octyl, nonyl, decyl, undecyl, dodecyl, tridecyl, tetradecyl, pentadecyl, hexadecyl, heptadecyl, octadecyl Group, nonadecyl group, eicosyl group and alkyl groups such as isomers thereof; propenyl group, isopropenyl group, butenyl group, pentenyl group, hexenyl group, heptenyl group, octenyl group, nonenyl group, decenyl group, undecenyl group, dodecenyl group , Tridecenyl group, tetrade Group, pentadecenyl group, hexadecenyl group, heptadecenyl group, octadecenyl group, nonadecenyl group, eicosenyl and alkenyl groups such as isomers thereof; cyclopentyl, cyclohexyl, the cycloalkyl group such as cycloheptyl group;
Methylcyclopentyl group, ethylcyclopentyl group, propylcyclopentyl group, butylcyclopentyl group, dimethylcyclopentyl group, ethylmethylcyclopentyl group, diethylcyclopentyl group, dipropylcyclopentyl group, dibutylcyclopentyl group, methylcyclohexyl group, ethylcyclohexyl group, propylcyclohexyl group, Butylcyclohexyl group, dimethylcyclohexyl group, ethylmethylcyclohexyl group, diethylcyclohexyl group, dipropylcyclohexyl group, dibutylcyclohexyl group, methylcycloheptyl group, ethylcycloheptyl group, propylcycloheptyl group, butylcycloheptyl group, dimethylcycloheptyl group , Ethylmethylcycloheptyl group, diethylcycloheptyl group, dipropylcycloheptyl group Alkylcyclohexyl group such as tyl group, dibutylcycloheptyl group and isomers thereof; aryl group such as phenyl group, naphthyl group (including all isomers); tolyl group, ethylphenyl group, propylphenyl group, butylphenyl group , Pentylphenyl group, hexylphenyl group, heptylphenyl group, octylnonylphenyl group, nonylphenyl group, decylphenyl group, undecylphenyl group, dodecylphenyl group, xylyl group, ethylmethylphenyl group, diethylphenyl group, dipropylphenyl group Group, dibutylphenyl group, methylnaphthyl group, ethylnaphthyl group, propylnaphthyl group, butylnaphthyl group, dimethylnaphthyl group, ethylmethylnaphthyl group, diethylnaphthyl group, dipropylnaphthyl group, dibutylnaphthyl group and these It can be exemplified benzyl group, phenylethyl group, a phenylpropyl group, and arylalkyl groups such isomers thereof; alkylaryl groups such isomers.

R ¹ and R ² in the formula (1) are preferably hydrogen, a linear or branched alkyl group having 1 to 18 carbon atoms, a phenyl group or a linear or branched alkyl group. An alkylphenyl group having a group having 7 to 18 carbon atoms is used, and specific examples of these groups include hydrogen, methyl group, ethyl group, propyl group, butyl group, pentyl group, hexyl group, heptyl group, Octyl group, decyl group, dodecyl group, tetradecyl group, hexadecyl group, octadecyl group, phenyl group, tolyl group, ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group Group, nonylphenyl group, decylphenyl group, dodecylphenyl group, xylyl group and isomers thereof. To be

Further, R ¹ in the formula (1) is hydrogen or a straight-chain or branched alkyl group having 1 to 4 carbon atoms (preferably straight-chain alkyl) from the viewpoint of more excellent cleanliness. Group) is more preferable, and specific examples of these groups include hydrogen, methyl group, ethyl group, propyl group and butyl group, and isomers thereof. From the same point, R ² in the formula (1) is represented by a linear or branched alkyl group having 1 to 4 carbon atoms (desirably a linear alkyl group), a phenyl group or a linear or branched alkyl group. More preferably, it is a hydrocarbon group selected from a C 7-18 alkylphenyl group having a branched alkyl group, and specific examples of these groups include a methyl group, an ethyl group, a propyl group, Butyl, phenyl, tolyl, ethylphenyl, propylphenyl, butylphenyl, pentylphenyl, hexylphenyl, heptylphenyl, octylphenyl, nonylphenyl, decylphenyl, dodecylphenyl, xylyl Groups and isomers thereof and the like.

On the other hand, in the formula (1), R ³ , R ⁴ , R ⁵ and R ⁶ may be the same or different and each is hydrogen,
A methyl group or an ethyl group, and R ³ , R ⁴ , R ⁵
And the total carbon number of R ⁶ is 1 or 2.

Further, in the present invention, a is an integer of 1 to 200, preferably 2 to 100, more preferably 5 to 50.

The polyoxyalkylene glycol derivative used as the base oil in the lubricating oil for a two-cycle engine of the present invention has the following general formula (3).

[0016]

[Chemical 5] It has a polyoxyalkylene chain represented by

[0017]

[Chemical 6] 1 represented by the general formula (4) and selected from among them
A homopolymer having an oxyalkylene group of two structures as a single constitutional unit, which is represented by the general formula (4) and is selected from 2
From random copolymers or block copolymers having oxyalkylene groups having different structures of different types as constituent units (in this case, a represents the total degree of polymerization of oxyalkylene groups represented by the general formula (4)) or from It is derived from a mixture of two or more polymers selected (in this case, a represents the total average degree of polymerization of oxyalkylene groups represented by the general formula (4) in the polymer mixture). Means

The viscosity of the polyoxyalkylene glycol derivative represented by the formula (1) is arbitrary, but it is 100 ° C.
Viscosity of 1 to 100 mm ² / s, preferably 5 to 50 m
Those of m ² / s are preferably used in practice.

The two-cycle engine lubricating oil of the present invention uses a polyoxyalkylene glycol derivative represented by the formula (1) as a base oil. If necessary, crude oil is subjected to atmospheric distillation and vacuum distillation. The lubricating oil fraction obtained in this way was refined by solvent degassing, solvent extraction, hydrocracking, solvent dewaxing, catalytic dewaxing, hydrorefining, sulfuric acid washing, clay treatment, and other appropriate combinations of paraffin. Mineral oils such as oils and naphthenes, poly α-olefin oils (polybutene, 1-octene oligomers, 1-decene oligomers, etc.), diester oils (ditridecyl glutarate, di-2-ethylhexyl adipate, diisodecyl adipate, ditridecyl) Adipate, di-2-ethylhexyl sebacate, etc., polyol ester oil (trimethylolpropane Such as relate, trimethylolpropane pelargonate, pentaerythritol 2-ethylhexanoate, pentaerythritol pelargonate), polyglycol oil (other than the polyoxyalkylene glycol derivative represented by the formula (1) of the present invention), etc. Mineral oil-based diluents such as synthetic lubricating oil and kerosene may be used alone or in combination of two or more kinds, and mixed with the polyoxyalkylene glycol derivative of the present invention as a base oil. The total mixing ratio of these other base oils is arbitrary as long as the characteristics of the lubricating oil for a two-cycle engine of the present invention are not impaired, but usually 100 parts by weight or less relative to 100 parts by weight of the polyoxyalkylene glycol derivative, It is preferably 50 parts by weight or less.

The two-cycle engine lubricating oil of the present invention exhibits excellent performance even when the polyoxyalkylene glycol derivative represented by the formula (1) is used alone without any additives. However, for the purpose of further improving the cleanability, a nitrogen-containing compound represented by the following formula (2) and / or its boride compound can be blended.

[0021]

[Chemical 7] (2) In the formula, R ⁷ is an alkyl group having 1 to 22 carbon atoms, an alkenyl group having 3 to 22 carbon atoms, a cycloalkyl group or an alkylcycloalkyl group having 5 to 15 carbon atoms, or an aryl group having 6 to 18 carbon atoms. Shows a hydrocarbon group selected from a group, an alkylaryl group or an arylalkyl group, and specifically, for example, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group, a heptyl group,
Alkyl group such as octyl group, nonyl group, decyl group, undecyl group, dodecyl group, tridecyl group, tetradecyl group, pentadecyl group, hexadecyl group, heptadecyl group, octadecyl group, nonadecyl group, eicosyl group and isomers thereof; propenyl group , An isopropenyl group,
Butenyl, pentenyl, hexenyl, heptenyl, octenyl, nonenyl, decenyl, undecenyl, dodecenyl, tridecenyl, tetradecenyl, pentadecenyl, hexadecenyl, heptadecenyl, octadecenyl, nonadecenyl, eicosenyl And alkenyl groups such as isomers thereof; cyclopentyl groups, cyclohexyl groups, cycloalkyl groups such as cycloheptyl groups; methylcyclopentyl groups, ethylcyclopentyl groups, propylcyclopentyl groups, butylcyclopentyl groups, dimethylcyclopentyl groups, ethylmethylcyclopentyl groups, Diethylcyclopentyl group, dipropylcyclopentyl group, dibutylcyclopentyl group, methylcyclohexyl group, ethylcyclohexyl group, propylcyclopentyl group Lohexyl group, butylcyclohexyl group, dimethylcyclohexyl group, ethylmethylcyclohexyl group, diethylcyclohexyl group, dipropylcyclohexyl group, dibutylcyclohexyl group, methylcycloheptyl group, ethylcycloheptyl group, propylcycloheptyl group, butylcycloheptyl group, dimethyl Cycloheptyl group, ethylmethylcycloheptyl group, diethylcycloheptyl group, dipropylcycloheptyl group,
Alkylcyclohexyl groups such as dibutylcycloheptyl group and isomers thereof; aryl groups such as phenyl group, naphthyl group (including all isomers); tolyl group,
Ethylphenyl group, propylphenyl group, butylphenyl group, pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group, decylphenyl group, undecylphenyl group, dodecylphenyl group, xylyl group, ethylmethyl Phenyl group,
Diethylphenyl group, dipropylphenyl group, dibutylphenyl group, methylnaphthyl group, ethylnaphthyl group, propylnaphthyl group, butylnaphthyl group, dimethylnaphthyl group, ethylmethylnaphthyl group, diethylnaphthyl group,
Examples thereof include alkylaryl groups such as dipropylnaphthyl group, dibutylnaphthyl group and isomers thereof; arylalkyl groups such as benzyl group, phenylethyl group, phenylpropyl group and isomers thereof.

R ⁷ in the formula (2) has 1 to 1 carbon atoms.
8 straight-chain or branched alkyl group, phenyl group or straight-chain or branched alkyl group having 7 to 7 carbon atoms
18 alkylphenyl groups are preferably used, and specific examples of these groups include a methyl group, an ethyl group,
Propyl group, butyl group, pentyl group, hexyl group, heptyl group, octyl group, decyl group, dodecyl group, tetradecyl group, hexadecyl group, octadecyl group, phenyl group, tolyl group, ethylphenyl group, propylphenyl group, butylphenyl group , Pentylphenyl group, hexylphenyl group, heptylphenyl group, octylphenyl group, nonylphenyl group, decylphenyl group, dodecylphenyl group, xylyl group and isomers thereof.

Further, R ⁸ and R ⁹ in the formula (2) may be the same or different and each represents hydrogen or a carbon number of 2 to 2.
It is an alkyl group of 6 and the total carbon number of R ⁸ and R ⁹ is 2 to 8, preferably 2 to 6. Specific examples of R ⁸ and R ⁹ include an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group and isomers thereof, and an ethyl group is particularly preferably used.

On the other hand, in the formula (2), b represents an integer of 1 to 8, preferably 1 to 6, and c represents an integer of 5 to 40, preferably 10 to 30.

The boride of the nitrogen-containing compound represented by the general formula (2) in the present invention means a compound obtained by reacting the nitrogen-containing compound represented by the general formula (2) with a borating agent. Is.

The boronizing agent referred to here is a general formula
Nitrogen-containing boron by reacting with the nitrogen-containing compound represented by (2)
All boration agents which form the elementary compound are contained.
Specific examples of the boration agent include orthoboric acid.
(H₃ BO₃ ), Metaboric acid (HBO₂ ), Tetraboric acid
(H₂ B_Four O₇ ) Such as boron acid, boron oxide (B₂ 
O ₃ ) Boron oxide, boron fluoride, phosphine chloride
Boron halides such as boron and boron bromide
Ammonium acid, sodium borate, potassium borate
A salt of boric acid, and a general formula (5)

[0027]

[Chemical 8] A lower alkyl ester of boric acid represented by the formula ((5), R ¹⁰ is an alkyl group having 1 to 6 carbon atoms, d is 1 to 3,
e represents an integer of 0 to 2 and is d + e = 3), more specifically, mono-, di- and trimethylborate,
Mono-, di- and triethyl borate, mono-, di-
And tripropylborate, mono-, di- and tributylborate, mono-, di- and tripentylborate, mono-, di- and trihexylborate, and the like,
And mixtures thereof are preferably used. Among these, the boronating agent of the present invention is more preferably a boron acid or a boric acid lower alkyl ester, and particularly preferably orthoboric acid, a boric acid lower alkyl ester, or a mixture thereof.

The amount of the borating agent in the boration is arbitrary, but a sufficient amount of the boration agent is obtained so that the boron content of the boride finally obtained is 0.05 to 7.0% by weight. It is preferable to use an agent. Generally, the number of boron atoms in the borating agent is 0.05 to 10, preferably 0. 1 to 1 nitrogen atom in the nitrogen-containing compound represented by the general formula (2).
It should be 1-2.

The boronation with the boration agent is carried out by heating the nitrogen-containing compound represented by the general formula (2) together with the boration agent. In the boration reaction, water, alcohol, hydrocarbon and a mixture thereof may be made to coexist if necessary. Water and / or alcohol is used as a “reactive solvent” that reacts with a boration agent to form a preferable intermediate reactant for the boration reaction, and is effective in improving the yield of the boration reaction. Further, hydrocarbon is used as a "non-reactive solvent", and in addition to its role as a solvent for the boration reaction, it also has the effect of azeotropically removing the water produced in the reaction from the system.

Specific examples of the alcohol include methanol, ethanol, propanol, isopropanol, and n.
-Butanol, sec-butanol, pentanol (amyl alcohol, isoamyl alcohol), hexanol, ethylene glycol, propylene glycol, butylene glycol, pentylene glycol, hexylene glycol and the like are preferably used. As the hydrocarbon, specifically, benzene, toluene, xylene, petroleum naphtha, cyclohexane, hexane, mineral oil and the like are preferably used.

The reaction temperature at the time of boration must be high to some extent in order to react the boring agent with the nitrogen-containing compound represented by the general formula (2), but it is so high that the reaction product or the product is decomposed. Do not raise it. A suitable reaction temperature is usually 50 to 250 ° C, preferably 80 to 180 ° C. Since the boration reaction is generally completed in a short time,
The reaction time is usually 0.5 to 8 hours, preferably 2 to 6 hours.

After the boration reaction is complete, the reaction mixture is heated and the water produced by the reaction and, if used, the solvent is distilled off. Then, if necessary, the reaction mixture is diluted with an organic solvent such as benzene, toluene, xylene, hexane, benzine, volatile oil for rubber, and petroleum ether, and the unreacted borating agent is removed by filtration or solvent extraction. The produced nitrogen-containing boron-containing compound can be obtained.

The ratio of the number of nitrogen atoms to the number of boron atoms in the finally obtained nitrogen-containing boron-containing compound can be arbitrarily changed by changing the amount of the borating agent relative to the nitrogen-containing compound in the boration step. Yes, but usually 1: 0.
05-5, preferably 1: 0.1-2.

When the nitrogen-containing compound represented by the general formula (2) and / or its boride is added to the lubricating oil for a two-cycle engine of the present invention, the content is usually 0 based on the total amount of the composition. It is desirable to add 0.5 to 20% by weight, preferably 1 to 10% by weight. If the content does not reach this range, the effect of improving the cleanliness by adding this compound is poor, while if the content exceeds this range, the effect of improving the cleanliness commensurate with the amount added cannot be obtained. Both are not preferable because they are economically disadvantageous.

In order to further enhance the excellent performance of the lubricating oil for a two-cycle engine of the present invention, known antioxidants, load-bearing additives, metallic detergents, ashless dispersants, and Lubricating oil additives such as metal deactivators, viscosity index improvers, pour point depressants and defoamers alone,
Alternatively, two or more kinds can be added in combination.
Except for the defoaming agent, it is important that these additives are stably dissolved in the base oil of the two-cycle engine lubricating oil of the present invention and do not cause turbidity or precipitation. Careful attention must be paid to the selection. The amount of these additives added is arbitrary, but it is usually preferable to add them so that the total content of the additives is 20% by weight or less based on the total amount of the composition.

[0036]

EXAMPLES Hereinafter, the contents of the present invention will be described more specifically with reference to Examples and Comparative Examples, but the present invention is not limited to these contents.

The polyoxyalkylene glycol derivatives A to I used as base oils in the examples are the polyoxyalkylene glycol derivatives represented by the general formula (1) in which R ^{1 to} R ⁶ and a are shown in Table 1. It has a structure or a number.

[0038]

[Table 1] The nitrogen-containing compound A used in the examples has the following chemical formula

[0039]

[Chemical 9] The boride of the nitrogen-containing compound A used in the examples is a compound obtained by borating the above-mentioned nitrogen-containing compound A by the following method.

Boronation A nitrogen-containing compound A (600 g) and orthoboric acid (10.6 g) were placed in a 1-liter flask equipped with a condenser equipped with a trap tube, a nitrogen blowing tube, a thermometer and a stirrer, and the mixture was stirred and heated while sucking nitrogen. To start. Reaction temperature 12
The reaction is carried out at 0 ° C for about 3 hours, and the distilled water is put into a trap tube for
The reaction is stopped when 1 is distilled. The reaction mixture in the flask was then transferred to a 1 liter eggplant type flask and
Distillation was carried out for 1 hour under conditions of 0.1 ° C. and 0.1 mmHg to obtain a boride of nitrogen-containing compound A (boric acid modified product) which is a yellow transparent viscous product. The elemental analysis of this compound revealed that it was 1.6% by weight of nitrogen and 0.59% by weight of boron, and was a compound represented by the following chemical formula.

[0041]

[Chemical 10] Examples 1 to 13 and Comparative Examples 1 to 4 Examples 1 to 1 were prepared by blending the components shown in Table 2.
As No. 3, a two-cycle engine lubricating oil according to the present invention was prepared.

Performance Evaluation Test The following performance evaluation test was performed on the lubricating oil for a two-cycle engine according to the present invention shown in Table 2, and the results are also shown in Table 2.

For comparison, the same performance evaluation test was conducted on mineral oil (Comparative Example 1), polybutene (Comparative Example 2) and commercially available two-cycle engine oils (Comparative Examples 3 and 4), and the results are also shown in Table 2. Also described in. (1) Smoke (exhaust smoke) test Motorcycle equipped with a 2-cycle engine (air cooling, 4
The exhaust smoke concentration (smoke) from the muffler was visually evaluated using 9 cc). In addition, the smoke criterion is 0-5
It was expressed in 6 stages (best = 0) and evaluated under three operating conditions (idling, sudden start, 40 km / h steady running). (2) Hot tube test (cleanability test) A hot tube test was carried out as a laboratory evaluation test.

The temperature of the hot tube (glass tube) is set to 28
Hold at 0 ℃, sample oil 0.3ml / h, air 10ml /
It was injected at a rate of min. After 16 hours, the hot tube was taken out, and after cleaning with a solvent, the degree of lacquer adhered to the inside of the tube was rated. Regarding the rating, colorless and transparent with no lacquer attached was set to 10 points, and black opacity was set to 0 points, and was evaluated in 11 grades according to the degree of stain. (3) Startability (startability) test Motorcycle equipped with a 2-cycle engine (air cooling, 4
After traveling about 10 km on the road using 9 cc), the motorcycle was left in the room for 1 hour and further left at -5 ° C for 3 hours. Next, a constant current (120 A) is applied externally (outside the low temperature room).
To the starter motor for 10 seconds, the engine was started, and the time required for the crank to rotate 4 times was measured. The shorter this time, the better the startability.

[0045]

[Table 2] Detergency test by motorcycle engine Two-cycle engine lubricating oils of Examples 1, 10 and 11 according to the present invention shown in Table 2 and commercially available two-cycles of Comparative Examples 3 and 4 shown in Table 2 for comparison Using the engine lubricating oil as a sample oil, a detergency test was conducted using a motorcycle engine.

A 123cc single cylinder, air-cooled two-cycle motorcycle engine was used, and the engine speed was 5
After the engine was operated for 5 hours under the conditions of 000 rpm, full load, plug seat temperature 200 ° C., and fuel: oil mixing ratio = 40: 1, the cleanliness inside the engine was visually evaluated, and the results are shown in Table 3. The cleanliness criterion is 0 to 10 (best = 10)
It was expressed in 11 steps.

[0047]

[Table 3] Examples 14 to 18 and Comparative Examples 5 to 14 The mixing stability (storage stability) of the polyoxyalkylene glycol derivative using the lubricating oil for a two-cycle engine of the present invention as a base oil and the additive property is evaluated by the method shown below. did.

That is, the polyoxyalkylene glycol derivative of the present invention was placed in a beaker, and the various additives shown in Table 4 were added thereto in the amounts shown in the same table.
It was heated and stirred for 1 hour. Next, the heating of the liquid was stopped, the state of the liquid after standing to cool at room temperature for 24 hours was examined, the solubility of the additive was evaluated, and the results are also shown in Table 4.

As for the evaluation, those which were uniformly dissolved were passed, and those which were turbid were rejected.

[0050]

[Table 4] The compositions of Examples 1 to 13 are lubricating oils for 2-cycle engines using the polyoxyalkylene glycol derivative constituting the present invention as a base oil, and these are, as is clear from the performance evaluation test results in Table 2, Smoke was significantly less than that of mineral oil (Comparative Example 1), and polybutene (Comparative Example 2) and a commercially available smokeless type two-cycle engine lubricating oil (Comparative Examples 3 and 4) using polybutene as part of the base oil composition were used. ) Smoke is small compared to.

Further, the two-cycle engine lubricating oils of Examples 1 to 13 exhibited extremely excellent high-temperature detergency as compared with the two-cycle engine lubricating oils of Comparative Examples 1 to 4 in the hot tube test. Shows.

On the other hand, in engine startability, it is generally desired that the number of seconds is less than that of mineral oil (Comparative Example 1). However, the lubricating oils for two-cycle engines of Examples 1 to 13 according to the present invention are all mineral oil ( Compared with Comparative Example 1) and a commercially available lubricating oil for a two-cycle engine (Comparative Examples 3 and 4), the number of seconds was shorter and excellent startability was exhibited. On the other hand, although polybutene (Comparative Example 2) shows superior performance to the above two-cycle engine oils of other Comparative Examples in the above high temperature cleanability,
Due to the stickiness of polybutene, engine startability is greatly inferior.

As is clear from the results of Table 3, a two-cycle engine lubricating oil containing the nitrogen-containing compound represented by the general formula (2) and its boride compound (Example 1)
0 and 11) show more excellent high-temperature detergency than the lubricating oil for a two-cycle engine of Example 1, and the effect of adding the nitrogen-containing compound and its boride is clearly shown.

Further, as is clear from the results in Table 4, this nitrogen-containing compound and its boride compound were compared with other ashless dispersants and metal detergents with respect to the polyoxyalkylene glycol derivative which is the base oil of the present invention. It has excellent solubility and storage stability.

[0055]

As described above, the lubricating oil for a two-cycle engine of the present invention has extremely low generation of exhaust smoke (smoke), excellent engine startability, and detergency to prevent carbon clogging of the exhaust system. It is an excellent one.

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display area C10M 149: 14) C10N 30:04 40:26 60:14

Claims (2)

[Claims] 1. A polyoxyal represented by the general formula (1).
Characterized by using a xylene glycol derivative as a base oil
Lubricating oil for 2-cycle engine. [Chemical 1](In the formula, R¹ And R² Can be the same or different
Hydrogen, an alkyl group having 1 to 22 carbon atoms, carbon
Alkenyl group having 3 to 22 carbon atoms, cycloalkyl having 5 to 20 carbon atoms
Alkyl group, alkylcycloalkyl group, or charcoal
An aryl group having a prime number of 6 to 20, an alkylaryl group or
An arylalkyl group, R³ , R^Four , R ^Five And R
⁶ May be the same or different, respectively hydrogen and methyl.
Group or ethyl group, and R³ , R^Four , R^Five And
And R⁶ Has a total carbon number of 1 or 2, and a is 1 to 20.
It is an integer of 0. ) 2. A polyoxyal represented by the general formula (1).
Using a xylene glycol derivative as a base oil,(In the formula, R¹ And R² Can be the same or different
Hydrogen, an alkyl group having 1 to 22 carbon atoms, carbon
Alkenyl group having 3 to 22 carbon atoms, cycloalkyl having 5 to 20 carbon atoms
Alkyl group, alkylcycloalkyl group, or charcoal
An aryl group having a prime number of 6 to 20, an alkylaryl group or
An arylalkyl group, R³ , R^Four , R ^Five And R
⁶ May be the same or different, respectively hydrogen and methyl.
Group or ethyl group, and R³ , R^Four , R^Five And
And R⁶ Has a total carbon number of 1 or 2, and a is 1 to 20.
It is an integer of 0. ) And a nitrogen-containing compound represented by the general formula (2)
The amount of the compound and / or its boride is 0.
Two-cycle engine characterized by containing 5 to 20% by weight
Lubricating oil composition for engine. [Chemical 3](In the formula, R⁷ Is an alkyl group having 1 to 22 carbon atoms, and 3 carbon atoms
~ 22 alkenyl groups, cycloalkenyl having 5 to 15 carbon atoms
Group or alkylcycloalkyl group, or carbon number
6-18 aryl groups, alkylaryl groups or ants
Is an alkyl group, R⁸ And R⁹ Are the same but different
May be present, and each is hydrogen or an atom having 2 to 6 carbon atoms.
Rukiru group and R⁸ And R⁹ Has 8 to 8 carbon atoms
And b is an integer of 1 to 8 and c is an integer of 5 to 40.
It )