JP3219264B2 - Mist oil composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mist oil composition, and more particularly, to a lubricating portion which has a sufficient amount of oil to reach and has a small amount of scattered mist (stray mist), and is suitable as an oil for spray oiling. Mist oil composition.

[0002]

2. Description of the Related Art As lubricating oil supply methods, various methods are known, and one of them is a spray oiling method. This spray refueling method is a method in which a small amount of oil is atomized by a spray refueling device, the formed oil mist is put on a compressed airflow, carried to bearings and other oiling parts, lubrication is performed by an oil mist, and cooling is performed by compressed air. is there. The lubricating oil used in the spray oiling method is called mist oil. In such a spray refueling method, there is a problem that stray mist is unavoidable and causes environmental pollution. Therefore, in recent years, there has been a demand for the reduction of the stray mist in order to improve the environment in a factory. On the other hand, in order to prevent seizure of the lubricated portion, it is necessary that a sufficient amount of oil reach (recovery amount) in the lubricated portion. To reduce stray mist,
It is known that it is effective to increase the amount of the high molecular weight polymer blended into the mist oil. However, if the amount of the high molecular weight polymer is increased, the amount of oil reaching the lubricating portion (recovery amount) is reduced. The problem of reduction occurs. For this reason, the conventional mist oils are mainly those in which the blending amount of the high molecular weight polymer is adjusted to ensure a sufficient amount of oil reached (recovered amount), and there is a drawback that there are many stray mist. Was.

[0003]

SUMMARY OF THE INVENTION Under such circumstances, the present invention provides a sufficient amount of oil to reach the lubricating portion (recovery amount).
It is an object of the present invention to provide a mist oil composition which has a small amount of stray mist and is suitable as an oil for spray refueling.

[0004]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to develop a mist oil composition having the above-mentioned preferable properties, and as a result, a base oil has a high molecular weight polymer having a specific molecular weight and a high molecular weight polymer having a specific molecular weight. It has been found that those blended with a low molecular weight polymer or further blended with an extreme pressure agent, an oiliness agent and / or a rust inhibitor can be suitable for the purpose. The present invention has been completed based on such findings.

That is, the present invention relates to (A)
A high molecular weight polymer having a weight average molecular weight of 120,000 to 1,000,000, and (B) a weight average molecular weight of 1,000 to 100
A mist oil composition comprising a low molecular weight polymer of component (A), a low molecular weight polymer of component (B), and (C)
A mist oil composition comprising (a) at least one selected from an extreme pressure agent and an oil agent and / or (b) a rust inhibitor is provided. The base oil used in the mist oil composition of the present invention is not particularly limited, but usually has a kinematic viscosity at 40 ° C. of 10
８００800 mm ² / sec, preferably 20 to 700 mm
Mineral or synthetic oils in the range of ² / sec or mixtures thereof are used.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The above mineral oils include, for example, paraffinic mineral oils, intermediate mineral oils, and naphthenic mineral oils obtained by ordinary refining methods such as solvent refining and hydrogenation (hydrogenation) refining. Can be Examples of the synthetic oil include esters such as polyol ester, dibasic acid ester and phosphoric acid ester, ethers such as polyphenyl ether, alkylbenzene, and alkylnaphthalene. Of these, mineral oils such as paraffin-based mineral oil, intermediate-based mineral oil, and naphthenic-based mineral oil are preferred from the viewpoint of the performance of the obtained mist oil composition. Further, the base oil preferably has a wide molecular weight distribution from the viewpoint of increasing the amount of mist generation and reducing the amount of stray mist. Such a base oil can be obtained, for example, by a method of mixing two or more types of mineral oils having different viscosities to adjust to a desired viscosity. In particular, in order to maintain a large amount (recovery amount) reaching the lubricating portion and greatly reduce the amount of stray mist that deteriorates the working environment, (a) a base oil having a number average molecular weight of 600 or more as a base oil. It is effective to use a mixture of 90% by weight and (b) 40 to 10% by weight of a base oil having a number average molecular weight of 550 or less. This (a)
As a base oil having a number average molecular weight of 600 or more (base oil (a)),
Those having a number average molecular weight of 600 to 1,000 (particularly, mineral oil, specifically, paraffin-based mineral oil, etc.) are suitable. Also,
(b) As the base oil having a number average molecular weight of 550 or less (base oil (b)), those having a number average molecular weight of 450 or less, particularly 450 to 200 (particularly mineral oil, specifically, paraffin-based mineral oil, etc.) are suitable. is there. The mixing ratio of the base oil (a) and the base oil (b) is preferably 60 to 80% by weight of the base oil (a) and the base oil (b).
(b) 40 to 20% by weight.

The high molecular weight polymer of the component (A) in the composition of the present invention has a weight average molecular weight of 120,000.
Those in the range of １０００1,000,000 are used. If the weight average molecular weight is less than 120,000, the effect of reducing stray mist will not be sufficiently exhibited, and 1,000,000
If it exceeds, the solubility in the base oil is reduced. From the viewpoints of the effect of reducing stray mist and the solubility in base oil, the preferred weight average molecular weight is in the range of 120,000 to 750,000, and particularly preferably in the range of 120,000 to 600000. Examples of the high molecular weight polymer include acrylate polymers such as polymethacrylate and polyacrylate, polyisobutylene and polybutene or hydrides thereof, olefin polymers such as ethylene-α-olefin copolymer, and styrene. -Isoprene copolymers and the like, and among these, acrylic ester-based polymers are preferred from the viewpoint of the effect of reducing stray mist and the like.

In the present invention, the high molecular weight polymer of component (A) may be used alone or in combination of two or more. In addition, the compounding amount is not particularly limited and may be appropriately selected according to various situations, but is usually selected in the range of 0.01 to 2.5% by weight based on the total amount of the composition. If the amount is less than 0.01% by weight, the effect of reducing stray mist may not be sufficiently exhibited, and if it exceeds 2.5% by weight, the amount of mist generation and the amount of recovery tends to be extremely reduced. From the viewpoint of reducing the amount of stray mist and suppressing the reduction in the amount of mist generated and recovered, the preferred compounding amount is in the range of 0.01 to 1.0% by weight, particularly
A range from 0.01 to 0.5% by weight is preferred.

Next, the low molecular weight polymer of the component (B) in the composition of the present invention has a weight average molecular weight of 100.
Those in the range of 0 to 100,000 are used. If the weight average molecular weight deviates from the above range, the effects of the present invention cannot be sufficiently exhibited. In order for the effects of the present invention to be better exhibited, the weight average molecular weight of this low molecular weight polymer is 2
The range of 000 to 90000 is preferred. Examples of the low molecular weight polymer include acrylate polymers such as polymethacrylate and polyacrylate, ethylene-α-olefin (especially propylene) copolymer, polyisobutylene and polybutene or hydrides thereof, and other poly-α. -Olefins, styrene-isoprene copolymers and the like. Among them, acrylic ester-based polymers, ethylene-α-olefin copolymers and polyisobutylene are particularly preferable from the viewpoint of the amount of mist generated and the amount recovered. Alternatively, polybutene or a hydride thereof is preferred.

In the present invention, the low molecular weight polymer of the component (B) may be used alone or in combination of two or more. In addition, the compounding amount is not particularly limited and may be appropriately selected according to various situations, but is usually selected in the range of 0.01 to 6% by weight based on the total amount of the composition. If the amount is less than 0.01% by weight, the amount of mist generated and recovered is not sufficient, and if it exceeds 6% by weight, the amount of stray mist may increase or other performance as mist oil may be impaired. From the viewpoint of the balance of the amount of mist generated and collected, the reduction of stray mist, and other performances of mist oil, the preferred amount is 0.5 to 0.5.
A range of 3.5% by weight is preferred.

Further, in the composition of the present invention, the blending ratio of the high molecular weight polymer (A) and the low molecular weight polymer (B) is 1: 0.01 to 1: 6 by weight.
It is preferably in the range of 00. When the proportion of the component (B) is less than the above range, the amount of mist generated and the amount of recovery are reduced,
On the contrary, if it is more than the above range, the amount of stray mist may increase. From the viewpoints of the amount of mist generated and recovered, and the reduction of stray mist, the preferable mixing ratio of the components (A) and (B) is 1: 0.05 to 1:50.
0, and particularly preferably in the range of 1: 0.1 to 1: 400. Also, the mixing ratio of the components (A) and (B) is determined by the weight average molecular weight of each polymer and the mixing amount (% by weight).
And the ratio of each product is 1: 1 to 60
It is preferably in the range 0: 1. If the ratio of the product of the components (A) is less than the above range, the amount of stray mist may increase, which is not preferable. Conversely, if it exceeds the above range, the amount of mist generated and the amount of recovery may decrease, which is not preferable. From the viewpoint of the reduction of stray mist and the amount of mist generation and recovery, the preferred ratio of the product of the component (A) to the product of the component (B) is in the range of 2: 1 to 250: 1, and particularly preferably 2: A range from 1 to 100: 1 is preferred. In the composition of the present invention, a recovery amount of at least 400 g, preferably 4
It is desirable to obtain 50 g or more.

In the composition of the present invention, if necessary,
As the component (C), at least one selected from (A) an extreme pressure agent and an oil agent and / or (B) a rust inhibitor can be blended. The extreme pressure agent and oiliness agent of the component (A)
It is an additive for preventing wear and seizure of gears and bearings in lubricated parts. There is no particular limitation on the type of the extreme pressure agent or the oil agent, and any one can be selected from those conventionally used for mist oil. Preferred examples of such a material include sulfurized olefins, phosphate amine salts, polysulfide, zinc dithiophosphate (ZnDTP), and the like. These extreme pressure agents and oil agents of component (A) may be used alone or in combination of two or more. Also,
The compounding amount is preferably in the range of 0.1 to 50% by weight based on the total amount of the composition, particularly preferably 1 to 50%, from the viewpoint of the balance between the effect of preventing abrasion and seizure, the other properties of mist oil and the economic efficiency. A range of from 10 to 10% by weight is preferred.

On the other hand, the rust inhibitor of the component (b) is an additive for preventing rust, corrosion and the like of the gears and bearings of the lubricated portion. There is no particular limitation on the type of the rust inhibitor, and any one can be selected from those conventionally used in mist oils. As such a compound, for example, benzotriazole, alkenyl succinimide, alkenyl succinate and the like are preferably mentioned. These (ii) component rust inhibitors may be used alone or in combination of two or more. In addition, the compounding amount is from the viewpoint of balance of rust and corrosion prevention effect, other performance of mist oil and economical efficiency.
The range is preferably from 0.01 to 10% by weight, particularly preferably from 0.01 to 2% by weight, based on the total amount of the composition. The mist oil composition of the present invention may contain, if desired, additives other than the above components, such as an antioxidant, an ashless dispersant, a metal detergent, and an interface, as long as the object of the present invention is not impaired. An activator, an antifoaming agent and the like can be appropriately added.

Here, examples of the antioxidant include amine antioxidants such as alkylated diphenylamine, phenyl-α-naphthylamine and alkylated-α-naphthylamine, and 2,6-di-t-butyl-4-amine. Methylphenol; 4,4'-methylenebis (2,6-di-t-butylphenol); 4,4'-bis (2,6-di-t-butyl)
Butylphenol); 4,4'-bis (2-methyl-6
-T-butylphenol); 2,2'-methylenebis (4-ethyl-6-t-butylphenol); 2,2 '
-Methylenebis (4-methyl-6-t-butylphenol); 4,4'-butylidenebis (3-methyl-6-t
-Butylphenol); 4,4'-thiobis (2-methyl-6-t-butylphenol); 4,4'-thiobis (3-methyl-6-t-butylphenol); 2,2 '
-Thiobis (4-methyl-6-t-butylphenol)
And phenolic antioxidants. These are usually added at a ratio of 0.05 to 2% by weight based on the total amount of the composition. Examples of the ashless dispersant include succinimide-based, succinamide-based, benzylamine-based and boron derivatives thereof, and ester-based dispersants. Examples of the metal-based detergent include calcium sulfonate and magnesium sulfonate. , Barium sulfonate, calcium phenate, barium phenate and the like. Examples of the surfactant include polyoxyethylene alkylphenyl ether, and examples of the antifoaming agent include dimethylpolysiloxane.

[0015]

Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. The performance of the mist oil composition was determined according to the following test method. <Test method> As a test device, 4.3 CF manufactured by Alemite Co., Ltd.
Spray nozzle type 326370-
8 (8-hole type) using two, with the device shown in FIG.
Mist pressure: 550 mmH ₂ O, oil temperature: 38 ° C., air primary pressure: 3.2 kg / cm ² , air temperature: 80 ° C., pipe inner diameter: 3/4 inch, test time: 20 hours, mist formation test Was done. (1) Mist generation amount The amount of decrease in the amount of oil in the mist generation device 1 before and after the test was measured and defined as the mist generation amount. (2) Recovered amount The amount of increase in the weight of the tank 2 before and after the test was measured and defined as the recovered amount. (3) Amount of stray mist The amount of increase in the amount of oil before and after the test of a sealed container (not shown) installed between A and B was measured, and the amount of stray mist was calculated from the following equation. Stray mist amount = mist generation amount− (aggregation amount in pipe + recovery amount) Examples 1 to 5 and proportional examples 1 to 4 A mist oil composition was prepared in a mixing ratio shown in Table 1,
Its performance was evaluated. The results are shown in Table 1.

[0016]

[Table 1]

[0017]

[Table 2]

[Note] 1) Paraffinic base oil: kinematic viscosity at 40 ° C. is 430 mm
^A mixture of two kinds of paraffinic mineral oils having different viscosities so as to be ² / sec. 2) Polyisobutylene: weight average molecular weight of 100,000 3) Polymethacrylate: weight average molecular weight of 84,000 4) Polyisobutylene: weight average molecular weight of 9,000 5) Ethylene -Propylene copolymer: weight average molecular weight 2
300 6) Polymethacrylate: weight-average molecular weight 230,000 7) Polymethacrylate: weight-average molecular weight 140,000 8) Polymethacrylate: weight-average molecular weight 590000 As can be seen from the above results, the amount of mist generated and the amount recovered are generally increased by adding a polymer. However, by using a combination of a specific high molecular weight polymer and a low molecular weight polymer as in the present invention, it is possible to reduce the amount of stray mist while maintaining the amount of mist generation and the amount of recovery.

Examples 6 and 7 Mist oil compositions were prepared in the proportions shown in Table 2 and
Its performance was evaluated. The results are shown in Table 2.

[0020]

[Table 3]

[Note] a) Polymethacrylate: weight average molecular weight 230,000 b) Ethylene-propylene copolymer: weight average molecular weight 2
300

[0022]

According to the mist oil composition of the present invention, the lubricated portion has a sufficient amount of oil reached (recovered amount), has a small amount of stray mist, and is used as an oil for spray oiling. It is suitably used for lubrication such as.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a test device used for evaluating the performance of a mist oil composition.

[Explanation of symbols]

 1: Mist generator 2: Mist collection tank 3: Spray nozzle 4: Machine parts to be lubricated

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-51-83607 (JP, A) JP-A-52-119607 (JP, A) JP-A-51-65103 (JP, A) JP-A-60-1985 170698 (JP, A) JP 49-4041 (JP, B1) JP 8-512334 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C10M 171/04 C10N 20 : 04 C10N 30:00 C10N 40:02 C10N 50:04

Claims (7)

(57) [Claims] (1) a weight average molecular weight of 12
A high molecular weight polymer of 0000 to 1,000,000,
(B) A mist oil composition comprising a low molecular weight polymer having a weight average molecular weight of 1,000 to 100,000. 2. The base oil (A) has a weight average molecular weight of 12
A high molecular weight polymer of 0000 to 1,000,000,
(B) A low molecular weight polymer having a weight average molecular weight of 1,000 to 100,000 and (C) (A) at least one selected from an extreme pressure agent and an oil agent and / or (B) a rust inhibitor. A mist oil composition characterized by the following. 3. The compounding amount of the high molecular weight polymer as the component (A) is 0.01 to 2.5% by weight and the compounding amount of the low molecular weight polymer as the component (B) is based on the total amount of the composition.
The mist oil composition according to claim 1, which is 0.01 to 6% by weight. 4. The compound according to claim 1, wherein the mixing ratio of the high molecular weight polymer as the component (A) and the low molecular weight polymer as the component (B) is 1: 0.01 to 1: 600 in weight ratio. Mist oil composition. 5. The compounding ratio of the high molecular weight polymer as the component (A) and the low molecular weight polymer as the component (B) is determined by the ratio of the product of the weight average molecular weight and the compounding amount (% by weight): The mist oil composition according to claim 1, wherein the ratio is 1 to 600: 1. 6. The base oil is a mixture of (a) 60 to 90% by weight of a base oil having a number average molecular weight of 600 or more and (b) 40 to 10% by weight of a base oil having a number average molecular weight of 550 or less. A mist oil composition according to any one of claims 1 to 5. 7. The base oil is a mixture of (a) 60 to 90% by weight of a base oil having a number average molecular weight of 600 or more and (b) 40 to 10% by weight of a base oil having a number average molecular weight of 450 or less. A mist oil composition according to any one of claims 1 to 5.