JPH06192677A - New plastic working oil composition - Google Patents

Abstract

PURPOSE:To obtain a composition excellent in degreasing properties, rust- preventive properties and press moldability and not becoming turbid. CONSTITUTION:The composition is prepared by mixing at least one base oil (A) selected from among mineral oil, fat, oil, and t synthetic oil with a phosphoric ester and/or a phosphorous ester (B) and a trimer of an 8-28C unsaturated fatty acid (C) in amounts to give an (A) to (C) weight ratio of 50/50-99/1, a (B) to (C) weight ratio or 0.5/1-10/1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic working oil composition which is excellent in degreasing property, rust preventive property and press formability and which does not cause turbidity.

[0002]

2. Description of the Related Art Generally, in a press forming process of an automobile body panel, a lubricating oil is used as a steel plate material in order to facilitate the forming,
Usually, low viscosity oil called rust preventive oil is widely used in consideration of degreasing efficiency in the subsequent process. As the rust preventive oil, a mineral oil as a base, which is mixed with a metal sulfonate, a lanolin ester, an oxidized wax, or the like is usually used.

However, aluminum alloy sheets for automobile body panels have extremely poor formability as compared with conventional cold-rolled steel sheets, and even if the above-mentioned rust preventive oil is used, press cracking occurs depending on the product shape, There was a problem that it could not be molded well. In order to prevent such press cracks, it is effective to reduce the friction between the aluminum alloy plate as a material and the die during press forming, and as a countermeasure against this, a high viscosity oil called press oil, a coating agent, A film of polyvinyl chloride (PVC) may also be used. However, if high-viscosity press oil or coating agent is used, the processing capacity of the degreasing process is diminished, and if polyvinyl chloride film is used, it adheres to the mold, so desorption work is required. It was not an effective means for becoming a person.

However, the present inventors have found that the combination of a base oil and a trimer of a specific fatty acid is used for degreasing,
It was found that a plastic working oil composition excellent in rust prevention and press formability can be obtained. However, fatty acid trimers may not dissolve in the base oil depending on the type and blending amount of the fatty acid, and the composition may be turbid. Such turbidity adversely affects the long-term stability of the product and reduces the added value. There was a problem.

Therefore, there has been a demand for a plastic working oil composition which is excellent in degreasing property, rust preventive property and press formability and which does not cause turbidity.

[0006]

Under such circumstances, as a result of intensive studies, the present inventors have found that a base oil and a trimer of a specific fatty acid are combined with a phosphoric acid ester and / or a phosphorous acid ester. It was found that a plastic working oil composition which is excellent in degreasing property, rust preventive property and press formability and which does not cause turbidity can be obtained by using it.

That is, the present invention provides the following components (A) to
(C): (A) one or more selected from mineral oils, fats and oils and synthetic oils as a base oil (B) phosphoric acid ester and / or phosphorous acid ester (C) unsaturated having 8 to 28 carbon atoms Fatty acid trimer,
(A) / (C) = 50/50 to 99/1, (B) /
(C) = A plastic working oil composition containing 0.5 / 1 to 10/1 by weight.

The base oil as the component (A) used in the present invention may be any of mineral oils, fats and oils, and synthetic oils, and one kind or a combination of two or more kinds thereof is used. here,
Mineral oils include, for example, spindle oils, machine oils, turbine oils, cylinder oils and the like; examples of fats and oils include whale oil, beef tallow,
Pig fat, rapeseed oil, castor oil, bran oil, palm oil, coconut oil, etc .; as synthetic oil, α-olefin, polybutene,
Examples thereof include esters, but are not limited to these and can be used. Among these base oils, those having a relatively low viscosity such as spindle oil and kerosene fraction are preferable in order to adjust the finish viscosity of the composition.

Of the component (B), the phosphoric acid ester is an ester of phosphoric acid and alcohol, is a neutral compound such as phosphoric acid trialkyl ester, and may further contain an acidic phosphoric acid ester. Specific examples include tributyl phosphate, trioctyl phosphate, triphenyl phosphate, tricresyl phosphate, trilauryl phosphate and the like, with tributyl phosphate and trioleyl phosphate being particularly preferred.

The phosphite ester is an ester of phosphite and an alcohol, which is a neutral compound such as trialkyl phosphite, and may further include an acidic phosphite ester. Specific examples include triphenyl phosphite, tris (nonylphenyl) phosphite, triisooctyl phosphite, trioleyl phosphite, and the like. These (B) components can be used alone or in combination of two or more.

The component (C), a trimer of an unsaturated fatty acid having 8 to 28 carbon atoms, includes undecylenic acid, laureleic acid, erucic acid, linderic acid, tudzuic acid, fizeteric acid,
Myristoleic acid, palmitoleic acid, petrothelinic acid, oleic acid, elaidic acid, asclepic acid, paxenoic acid, linoleic acid, oleic acid, hiragoic acid, eleostearic acid, punicic acid, linolenic acid, moloctic acid, stearidonic acid, talinic acid , Stearolic acid, crepenic acid, ximenic acid, malvalic acid, hydronocarpic acid,
Examples include trimers such as shoalmoogric acid and golphosphoric acid. These trimers can be used alone or in combination of two or more.

In the present invention, the mixing ratio by weight of the components (A) to (C) is (A) / (C) = 50/50 to 99/1,
Preferably 60/40 to 95/5, (B) / (C) =
The range is 0.5 / 1 to 10/1, preferably 1/1 to 8/1. Outside of this range, the composition becomes turbid.

In addition to the above-mentioned essential components, the plastic working oil composition of the present invention contains components used in ordinary processing oil compositions, such as rust preventives, extreme pressure agents, and antioxidants. It may be appropriately blended within a range that does not interfere with the above. Here, as the rust preventive, alkenyl succinic acid and its derivatives, esters such as sorbitan monooleate, or other amines, and as the extreme pressure agent, phosphorus compounds such as tricresyl phosphate and zinc dialkyldithiophosphate. An organometallic compound such as
Examples thereof include phenolic compounds such as di-t-butyl p-cresol and aromatic amines such as phenyl α-naphthylamine.

The plastic working oil composition of the present invention is produced by mixing the respective components by a conventional method.
The plastic working oil composition of the present invention thus obtained,
The finished viscosity is preferably 1 to 20 cst (40 ° C.), and it is preferable to appropriately select the ratios of the components (A) to (C) and the optional components so as to be within this range. If the finish viscosity is too low, the moldability is poor, and if it is too high, the other aluminum plate will rise when the molded and stacked aluminum plates are taken out (blocking property).
It is not preferable because it causes harmful effects, has poor weldability, and does not perform chemical conversion treatment well.

The steps for assembling an aluminum alloy sheet into an automobile using the plastic working oil composition of the present invention will be illustrated. First, plastic working oil is applied to an aluminum alloy plate. The coating method may be any method such as spray coating, electrostatic coating and dip coating. Next, a mold is formed, and then parts are welded. At this time, if the viscosity of the plastic working oil is too high, the weldability deteriorates. Next, a degreasing process for removing the plastic working oil, a chemical conversion treatment represented by phosphoric acid treatment or a chromate treatment, and then coating and assembling. The plastic working oil composition of the present invention is excellent in the above-mentioned formability and degreasing property, and does not affect the post-treatment such as weldability.

[0016]

EXAMPLES Next, the present invention will be further described with reference to examples, but the present invention is not limited to these examples.

Example 1 A plastic working oil composition having the composition shown in Table 7 was produced by a conventional method, and each composition was evaluated for solubility, bulging test, cylinder deep drawing test, oil stain test, infiltration test and degreasing property. The test was conducted. The results are shown in Table 7.

(Determination of solubility)

[Table 1] Judgment method: The solubility of the test oil is judged by visually observing the appearance of the test oil left under the specified conditions after mixing. Formulation conditions: 100 ml beaker with 100 ml of oil 5
Stirrer stirring at 0 ° C x 30 min. Leave condition: After mixing, leave at room temperature for 1 day in the room. Judgment Criteria: Transparent; transparent and uniformly dissolved with no suspended matter; turbid; opaque, suspended and not uniformly dissolved

(Overhang Test) The formability is evaluated. The larger the overhang height (mm), the better the moldability.

[Table 2] Die: φ55.00 mm, shoulder radius R5 mm Punch: φ32.0 mm Test piece: JIS A5000 series aluminum alloy plate Processing speed: 0.6 m / min Wrinkle holding force: 3000 kgf Lubrication amount: Approximately 1.0 g / m ² (oil coating on one side) Rating: Overhang height (mm)

(Cylindrical Deep Drawing Test) Formability is evaluated. The larger the limiting drawing ratio, the better the moldability.

[Table 3] Die: φ34.60 mm, shoulder radius R3 mm Punch: φ32.0 mm Test piece: JIS A5000 series aluminum alloy plate Processing speed: 0.6 m / min Wrinkle holding force: 500 kgf Lubrication amount: Approximately 1.0 g / m ² (oil coating on one side) Evaluation: Limiting draw ratio (LDR = blank diameter / punch diameter)

(Oil stain test)

[Table 4] Specimen: JIS A5000 series aluminum alloy plate 100 x 100 x 1.0 mm 5 sheets Oiling method: 2 g / m ² sample on one side was rubbed with a finger cot Condition: 5 test pieces Spacer (thickness 0.08mm, width 10
mm, length 100 mm, tetrafluoroethylene resin), and the four corners are clipped, and 50 ° C x relative humidity 9
Leave in 5% constant temperature bath for 2 weeks Evaluation: Presence of oil stain

(Infiltration test) The rust prevention property is evaluated.

[Table 5] Test piece: JIS A5000 series aluminum alloy plate 60 x 80 mm 3 sheets Oiling method: Same as in the case of oil stain Conditions: 50 ° C x 2 hours in a constant temperature tank with relative humidity of 95% or more Evaluation: Rust Display the amount of generation in the following 5 stages: A; 0% B; -10% C; -25% D; -50% E; 50% or more

(Degreasing test)

[Table 6] Test piece: Evaluation using the test piece after the above oil stain test Conditions: CO ₂ gas with a degreasing agent (2% by weight aqueous solution of a commercial detergent containing sodium hydroxide and sodium silicate as a main component) pH
Adjusted to 11, degreasing temperature 43 ° C., 20 liters of degreasing agent with propeller stirring, dipping test piece for 2 minutes Evaluation: Water wet area of test piece (%)

[0024]

[Table 7]

[0025]

The plastic working oil composition of the present invention has a degreasing property,
It is excellent in rust resistance and press moldability and does not cause dust, so that the added value of the product can be increased.

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Claims (1)

[Claims] 1. The following components (A) to (C): (A) one or more selected from mineral oils, fats and oils and synthetic oils as a base oil (B) phosphoric acid ester and / or phosphorous acid Ester (C) a trimer of an unsaturated fatty acid having 8 to 28 carbon atoms,
(A) / (C) = 50/50 to 99/1, (B) /
(C) = A plastic working oil composition contained in a weight compounding ratio of 0.5 / 1 to 10/1.