JP2006143937A - Lubricating oil for fin pressing and method for producing plate fin - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating oil for fin pressing, which causes no problems such as odor and rough skin, is characterized by low cost and good drying property, can effectively suppress adhesion of aluminum powders to punches, and can suppress the generation of aluminum dust resulting from abrasion and a method for producing a plate fin. <P>SOLUTION: The lubricating oil for fin pressing is used when a fin material for a heat exchanger, which is made of an aluminum plate, is subjected to press processing. The method for producing a plate fin, which uses the lubricating oil for fin pressing. The lubricating oil for fin pressing comprises a base oil comprising a non aroma mineral oil or/and an isoparaffin, a first additive comprising a fatty acid ester, and a second additive comprising at least 1 or more types selected from an aliphatic amine, alkanolamine, aliphatic polyamine, aromatic amine, alicyclic amine, heterocyclic amine, alkylene oxide addition product thereof, and alkyl sulfonate. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fin press lubricating oil used when pressing a heat exchanger fin material made of a hydrophilic pre-coated aluminum plate or an untreated aluminum plate that has not been subjected to a coating treatment. In addition, aluminum here contains aluminum and aluminum alloy.

  As a heat exchanger in an air conditioner, a plate fin tube heat exchanger configured by combining a large number of plate fins and tubes is frequently used. The plate fin is manufactured by pressing a fin collar portion having a height of 1 to 4 mm for inserting and fixing the tube into a heat exchanger fin material (hereinafter simply referred to as a fin material) made of an aluminum plate. .

  The fin color press working method includes a draw method, an ironing method, and a combined draw / ironing method, and recently, there is a combined draw / ironing method that can handle volatile lubricating oil. As an example, as shown in FIG. 3, the processing method of the combined drawing and ironing method is as follows for the material 9 in the order of overhang / drawing S1, S2 → drilling / burring S3 → ironing S4 → flaring S5. It implements (refer nonpatent literature 1).

  The pressing speed is 200 to 350 strokes per minute, and is in the direction of higher speed. In addition, since the machining of several tens of millions of strokes is performed without reworking the tool, good lubricity between the raw material and the machining die is required throughout the entire press process. Inferior lubricity causes a fatal problem of so-called “color jump” in which the fin collar breaks particularly during ironing.

  Further, in the case of drilling, because of shearing, there is a problem that aluminum powder generated from the shearing surface adheres to the punch. This adhesion does not cause a problem in the initial stroke, but when the number of strokes increases, the aluminum powder adhered to the punch causes a notch on the shearing surface of the material, and so-called `` cracking at the tip in the final flare process ''. This causes a fatal defect called “flare crack”. In addition, the tool life is shortened.

  In order to solve these problems, various improvements from the raw material side and lubricants have been made. Further, as the fin material, there are a precoat type in which a hydrophilic coating film is applied to an aluminum plate, and an untreated type in which no coating film is provided. Since the precoat type can add lubricating oil in or on the coating film, it is frequently used as having both hydrophilic and lubricating functions.

  However, with the recent increase in press working speed, there has been a high level requirement for further improvement of tool life and molding accuracy, and further improvement of lubricating oil has become indispensable. For this purpose, a large number of fin press lubricants (see, for example, Patent Documents 1 and 2) have been proposed, and various commercially available products are in circulation.

However, the conventional fin press lubricating oil has the following problems.
That is, in the fin press lubricants described in Patent Documents 1 and 2 or commercially available fin press lubricants, (1) in punching (shearing) which is one of the press working steps, Aluminum powder tends to adhere, (2) Dry to remove lubricating oil after press processing, but drying does not progress easily, (3) There is a smell and worsens the work environment, (4) When touching the skin He had many problems such as itching and rough skin.
In particular, the adhesion of aluminum powder can only be avoided by frequent punch care, and no fundamental solution has been found.

In order to solve these problems, there has been proposed a fin press lubricant that is free from problems such as odor and rough skin, is low in cost, has good drying properties, and can effectively suppress the adhesion of aluminum powder to the punch. (See Patent Document 3).
However, in recent years, demands for improving productivity have become more severe, and a problem has arisen that a large amount of aluminum wear powder is generated by further increasing the production speed. The aluminum wear powder generated in large quantities may adhere to the mold and cause various quality problems on the plate fins for the heat exchanger.
Therefore, in order to further improve the productivity, development of a fin press lubricating oil capable of suppressing the generation of aluminum wear powder is strongly desired.

JP-A-6-41573 JP-A-8-157851 JP 2004-263056 A Sumitomo Light Metal Technical Report “Development Status of Aluminum Fins Used in Heat Exchangers for Home and Commercial Air Conditioners” November 1994

  The present invention has been made in view of such conventional problems, has no problems such as odor and rough skin, is low in cost, has good drying properties, and can effectively suppress adhesion of aluminum powder to the punch. An object of the present invention is to provide a fin press lubricant and a plate fin manufacturing method capable of suppressing the generation of aluminum wear powder.

1st invention WHEREIN: In the lubricating oil for fin press used when pressing the fin material for heat exchangers which consists of aluminum plates,
A base oil composed of non-aromatic mineral oil or / and isoparaffin;
A first additive comprising a fatty acid ester represented by the general formula R ₁ —COO—R ₂ (where R ₁ is an alkyl group having 7 to 17 carbon atoms and R ₂ is an alkyl group having 1 to 4 carbon atoms);
A second compound comprising at least one selected from an aliphatic amine, an alkanolamine, an aliphatic polyamine, an aromatic amine, an alicyclic amine, a heterocyclic amine, and an alkylene oxide adduct thereof, an alkylsulfonic acid, and a salt thereof; Containing additives,
The content ratio of the first additive to the total amount of the first additive, the second additive, and the base oil is 1 to 10% by weight,
The content ratio of the second additive to the total amount of the first additive, the second additive and the base oil is 0.01 to 2.0% by weight,
And the viscosity of the said lubricating oil for fin presses is 1.0-3.5 mm < ² > / s in kinematic viscosity in the temperature of 40 degreeC, It exists in the lubricating oil for fin press characterized by the above-mentioned (Claim 1).

As described above, the lubricating oil for fin press of the present invention is based on non-aromatic mineral oil and / or isoparaffin, and includes the first additive comprising the specific fatty acid ester and the second additive comprising the specific substance. It is contained at a specific ratio. With this configuration, the above-described conventional problems can be solved at once.
That is, the lubricating oil for fin presses of the present invention has no problems such as odor and rough skin, is low in cost, has good drying properties, and in particular, when performing drilling with shearing, aluminum powder on the punch Can be significantly suppressed as compared with the conventional case, and the generation amount of aluminum wear powder can be further significantly suppressed.
Therefore, according to the present invention, comprehensive press working such as tool life, working efficiency, working environment, working accuracy, etc. can be significantly improved as compared with the prior art.

  In particular, the fin press lubricating oil of the present invention contains the second additive in the specific amount. Therefore, aggregation of aluminum wear powder can be suppressed and the amount of aluminum wear powder generated can be reduced as described above. Therefore, it is possible to prevent the generated aluminum wear powder from adhering to a mold or the like used at the time of pressing and adversely affecting the quality of aluminum products such as plate fins obtained after the pressing.

2nd invention is the manufacturing method of the plate fin which presses the fin material for heat exchangers consisting of an aluminum plate, and produces the plate fin of a heat exchanger,
In the plate fin manufacturing method, the fin press lubricating oil according to claim 1 or 2 is used at the time of press processing of the heat exchanger fin material (claim 3).

In the plate fin manufacturing method of the present invention, the fin press lubricating oil of the first invention is used at the time of fin pressing, that is, at the time of pressing the heat exchanger fin material.
Therefore, taking advantage of the excellent characteristics of the above-mentioned lubricating oil for fin presses, it is possible to suppress the generation amount of aluminum wear powder with almost no adhesion of aluminum powder to the punch even when high-speed pressing is performed. it can. Therefore, high-quality plate fins can be manufactured with high productivity. Moreover, the fin material for heat exchangers can be produced in a better working environment without causing problems such as odor and rough skin. Furthermore, since the fin press lubricant is low in cost, the plate fin can be produced at low cost. Further, since the lubricating oil can be easily removed by drying after pressing by utilizing the excellent drying property of the lubricating oil for fin press, a higher quality plate fin can be produced.

As described above, the base oil used in the fin press lubricating oil of the present invention is a non-aromatic mineral oil and / or isoparaffin, that is, a non-aromatic mineral oil or isoparaffin, or a group containing both non-aromatic mineral oil and isoparaffin. Use oil.
The non-aromatic mineral oil is a mineral oil that does not contain any aroma-based mineral oil, and one or two mineral oils of naphthene or paraffin can be adopted. In addition, as described above, the base oil may be isoparaffin alone, which is a synthetic oil, or may be a mixture of isoparaffin and non-aromatic mineral oil. By employing these base oils, it is possible to suitably prevent deterioration of the working environment due to odor and rough skin at low cost.

Further, as the first additive in the lubricating oil for the fin press, the general formula R ₁ -COO-R ₂ (provided that, R ₁ represents an alkyl group having 7 to 17 carbon atoms, R ₂ is from 1 to 4 carbon atoms Fatty acid ester represented by (alkyl group) is used.
The alkyl group R ₁ included in the above general formula, as described above, the number of carbon atoms and 7 to 17. When the carbon number of R ₁ is less than 7, there are problems such as poor lubricity, poor molding due to adhesion of aluminum powder, and a worse working environment with odor. On the other hand, when the carbon number of R ₁ exceeds 17, there is a problem that the drying property is deteriorated (it is difficult to dry), and the workability is deteriorated due to the high melting point and the solidification at room temperature. From these reasons of lubricity, aluminum powder adhesion, odor, drying properties, and workability, the carbon number range of the alkyl group R ₁ is preferably 7-17. More preferably, it is 9-13.

The alkyl group R ₂ contained in the above formula, the carbon number thereof and 1-4. When the carbon number of R ₂ exceeds 4, there is a problem that the drying property is deteriorated and the melting point becomes high and it is easy to solidify at room temperature, so that additional heating equipment is required and workability is deteriorated. For these reasons of drying and workability, the alkyl group R ₂ preferably has 1 to 4 carbon atoms.

  Specific examples of fatty acid esters applicable to the first additive include, for example, methyl caprylate, ethyl caprylate, propyl caprylate, butyl caprylate, methyl pelargonate, ethyl pelargonate, propyl pelargonate, pelargon Butyl acid, methyl caprate, ethyl caprate, propyl caprate, butyl caprate, methyl laurate, ethyl laurate, propyl laurate, butyl laurate, methyl myristate, ethyl myristate, propyl myristate, butyl myristate , Methyl palmitate, ethyl palmitate, propyl palmitate, butyl palmitate, methyl stearate, ethyl stearate, propyl stearate, butyl stearate, methyl oleate, ethyl oleate, olei Propyl, and butyl oleate.

The second additive in the fin press lubricating oil is composed of one or more selected from amines, alkylene oxide adducts thereof, alkyl sulfonic acids, and salts thereof.
Examples of amines used as the second additive include aliphatic amines, alkanolamines, aliphatic polyamines, aromatic amines, alicyclic amines, and heterocyclic amines. These amines may contain a hydroxyl group or an ether group.

  Specific examples of the aliphatic amine include, for example, methylamine, ethylamine, butylamine, caprylamine, laurylamine, stearylamine, oleylamine, tallow amine, dimethylamine, diethylamine, dioctylamine, butyloctylamine, distearylamine, dimethyloctylamine. Dimethyldecylamine, dimethyllaurylamine, dimethylmyristylamine, dimethylpalmitylamine, dimethylstearylamine, dimethylbehenylamine, dilaurylmonomethylamine, trioctylamine and the like.

  Specific examples of the alkanolamine include monoethanolamine, diethanolamine, triethanolamine, N-methylethanolamine, N, N-dimethylethanolamine, N-ethylethanolamine, N, N-diethylethanolamine, N-isopropylethanol. Amine, N, N-diisopropylethanolamine, monoisopropanolamine, diisopropanolamine, triisopropanolamine, N-methylisopropanolamine, N, N-dimethylisopropanolamine, N-ethylisopropanolamine, N, N-diethylisopropanolamine, N-isopropylisopropanolamine, N, N-diisopropylisopropanolamine, mono-n-propanolamine, di-n-propanolamine Tri n-propanolamine, N-methyl n-propanolamine, N, N-dimethyl n-propanolamine, N-ethyl n-propanolamine, N, N-diethyl n-propanolamine, N-isopropyl n-propanolamine, N, N-diisopropyl n-propanolamine, monobutanolamine, dibutanolamine, tributanolamine, N-methylbutanolamine, N, N-dimethylbutanolamine, N-ethylbutanolamine, N, N-diethylbutanolamine, There are N-isopropylbutanolamine, N, N-diisopropylbutanolamine and the like.

Specific examples of the aliphatic polyamine include ethylenediamine, diethylenetriamine, triethylenetetraamine, hexamethylenediamine, and cured beef tallow propylenediamine.
Specific examples of the aromatic amine include aniline, dimethylaniline, diethylaniline and the like.

  Specific examples of the alicyclic amine include, for example, N-cyclohexylamine, N, N-dicyclohexylamine, N, N-dimethyl-cyclohexylamine, N, N-diethyl-cyclohexylamine, N, N-di (3-methyl). -Cyclohexyl) amine, N, N-di (2-methoxy-cyclohexyl) amine, N, N-di (4-bromo-cyclohexyl) amine and the like.

  Specific examples of the heterocyclic amine include, for example, pyrrolidine, piperidine, 2-pipecholine, 3-pipecoline, 4-pipecoline, 2,4-pipecoline, 2,6-pipecoline, 3,5-lupetidine, piperazine, homopiperazine, N -Methylpiperazine, N-ethylpiperazine, N-propylpiperazine, N-methylhomopiperazine, N-acetylpiperazine, N-acetylhomopiperazine, 1- (chlorophenyl) piperazine, N-aminoethylpiperidine, N-aminopropylpiperidine, N-aminoethylpiperazine, N-aminopropylpiperazine, N-aminoethylmorpholine, N-aminopropylmorpholine, N-aminopropyl-2-pipecoline, N-aminopropyl-4-pipecholine, 1,4-bis (aminopropyl) ) Piperazine etc. That.

  Among the above amines, the second additive is preferably an amine having a hydrocarbon group having 4 or more carbon atoms having a branched chain from the viewpoint of solubility in oil. Moreover, when the total number of carbon atoms exceeds 20, there is a risk that oil stain is likely to occur in the annealing process.

In addition, the alkylene oxide adduct of amines used as the second additive may be an addition polymerization of alkylene oxides such as ethylene oxide, propylene oxide, butylene oxide, α-olefin oxide, styrene oxide, etc. to the above amines. Can be obtained. The polymerization form such as alkylene oxide to be added is not particularly limited, and may be homopolymerization of one type of alkylene oxide, random copolymerization of two or more types of alkylene oxide, block copolymerization, random / block copolymerization, or the like. .
Moreover, 1-6 are preferable and, as for the added mole number of alkylene oxide, 1-4 are more preferable. When the added mole number of alkylene oxide exceeds 6, the solubility in the base oil may be deteriorated.

Examples of the alkyl sulfonic acid and its salt used as the second additive include alkyl sulfonic acid, alkyl allyl sulfonic acid, amide sulfonate, sodium dialkyl sulfosuccinate and the like.
Particularly preferred is industrially inexpensive sodium dialkylsulfosuccinate. The carbon number (C number) of the alkyl group is preferably 4-18. If the alkyl group has less than 4 carbon atoms, the dispersibility of the second additive in the base oil may be reduced. On the other hand, when it exceeds 18, the viscosity becomes too high, and it becomes difficult to handle the second additive, and it may be difficult to adjust the fin press lubricant.

Moreover, the said lubricating oil for fin press contains 1-10 weight% of said 1st additives with respect to the total amount of a said 1st additive, a said 2nd additive, and the said base oil.
When the content ratio of the first additive is less than 1% by weight, there may be a problem of poor lubrication, flare cracking due to aluminum powder adhesion, and tool life reduction. On the other hand, when it exceeds 10% by weight, there is a possibility that problems of deterioration of drying property and high cost may occur.

The fin press lubricating oil contains 0.01 to 2.0% by weight of the second additive with respect to the total amount of the first additive, the second additive, and the base oil. .
When the content ratio of the second additive is less than 0.01% by weight, aggregation of the aluminum wear powder cannot be suppressed, and the generation amount of the aluminum wear powder may be increased. As a result, there is a possibility that the aluminum wear powder aggregates and adheres to the mold during the pressing process, and the quality of aluminum products such as plate fins obtained after the processing is deteriorated. On the other hand, even if the second additive is added in excess of 2% by weight, the agglomeration effect of the aluminum wear powder is not improved, and there is a possibility that the cost will be wastefully increased. In addition, when the amount exceeds 2% by weight, when the fin press lubricating oil is removed by drying, the amount of components remaining after volatilization of the base oil increases, which may reduce the quality of aluminum products such as plate fins. is there. Preferably, the content ratio of the second additive is 0.1 to 1.0% by weight.

Next, the viscosity of the lubricating oil for fin press is 1.0 to 3.5 mm ² / s as a kinematic viscosity at a temperature of 40 ° C. When the viscosity is less than 1.0 mm ² / s, seizure due to poor lubrication occurs, the collar is likely to fly, and the tool life may be shortened. On the other hand, when it exceeds 3.5 mm ² / s, there is a possibility that the problem that the drying property is deteriorated may occur.
The kinematic viscosity at a temperature of 40 ° C. of the fin press lubricating oil is required for a certain amount of test oil (fin press lubricating oil) to pass through the capillaries by, for example, a Canon-Fenske viscometer (a kind of capillary viscometer). It can be measured from time (Canon / Fenske viscosity measurement method).

Moreover, it is preferable that the boiling point of the said lubricating oil for fin presses is 150-300 degreeC (Claim 2).
When the boiling point of the fin press lubricating oil is less than 150 ° C., the drying speed at normal temperature is high, the consumption of the lubricating oil increases, and the cost may increase. On the other hand, when it exceeds 300 degreeC, there exists a possibility that it may become difficult to dry at the time of the drying after a fin press.

In the second aspect of the invention, the plate fin can be manufactured by subjecting a heat exchanger fin material made of an aluminum plate to press processing by, for example, a draw method, an ironing method, and a combined drawing and ironing method. . As a more specific method of press working, for example, the method described in Sumitomo Light Metal Technical Report “Development Status of Aluminum Fin Material Used for Heat Exchanger of Home and Commercial Air Conditioners” (November 1994) and the like. is there.
In the said 2nd invention, a plate fin can be produced using the lubricating oil for fin presses of the said 1st invention at the time of these press work.
Moreover, the plate fin obtained by said 2nd invention can be used as a heat exchanger (plate fin tube heat exchanger) combining a some plate fin and tube.

Example 1
Examples relating to the lubricating oil for fin presses of the present invention will be specifically described.
In this example, as shown in Table 1, as examples of the present invention, a plurality of types of fin press lubricants (samples E1 to E16) and a plurality of types of fin press lubricants (samples C1 to C24) as comparative examples. Were prepared and subjected to comparative tests of various performances.

  About the lubricating oil for fin presses of the samples E1 to E16 and the samples C1 to C24, the types of the base oil, the first additive and the second additive, and the total amount of the base oil, the first additive and the second additive The ratio of the first additive, the ratio (wt%) of the second additive, the viscosity, etc. are shown in Table 1 and Table 2, respectively. In addition, the viscosity of each sample was measured by the above-mentioned Canon-Fenske viscosity measuring method.

Next, in this example, using the samples E1 to E16 and the samples C1 to C24, various tests were performed as follows. In addition, in the test using a fin material as a raw material, it performed using 0.10mm thickness aluminum plate of JISA1050-H28. In some tests, the same material was used instead of a bar with a different shape.
The results of various tests are shown in Table 3 (Sample E1 to Sample E16) and Table 4 (Sample C1 to Sample C24). In this example, the above-mentioned JISA1050 was used as the material of the material, but the same results as in this example can be obtained even when using JISA1100, JISA1200, and Al-Mn alloys that are generally used as the fin material.

<Drying evaluation test>
The raw material (fin material) is processed into a flat bottom cup having a diameter of 25 mm, and test oils (samples E1 to E16 and samples C1 to C24) are added so as to be 10 g / m ² . The mixture was heated for 5 minutes, the difference in weight before and after heating was determined, and the amount of residual oil after drying was measured.
As a criterion, a case where the residual oil amount after drying by heating was 0.1 g / m ² or less was regarded as acceptable. Among them, the case of exceeding 0.05 g / m ² is indicated by “◯”, and the case of 0.05 g / m ² or less is indicated by “◎”. When it exceeded 0.1 g / m ^{2, the} test was rejected and indicated by “x”.

<Workability evaluation test>
As shown in FIG. 1, the adhesion of aluminum powder and the coefficient of friction were evaluated using a pin-on-disk test device 5. The pin-on-disk test apparatus 5 has a support part 51 for fixing a pin-shaped test material 59 and a disk part 52 that is rotatably disposed so as to face the support part 51. As the test material 59, a rod-shaped (pin-shaped) member having the same material as the fin material and a cross-sectional area of 5 mm ² was used. Further, SKD was used for the disk unit 52. Then, the test oil (samples E1 to E16 and samples C1 to C24) is dropped and supplied to the sliding portion between the disk portion 52 and the test material 59, the disk portion 52 is rotated, and the aluminum powder coagulation is performed. The amount of contact and the coefficient of friction were measured. The measurement is performed at normal temperature, the load F applied to the support part 51 is 10 kgf, the rotation radius (distance from the center of the disk part 52 to the center of the specimen 59) is 15 mm, the rotation speed is 30 rpm, and the measurement time is 20 min. Performed under conditions.

The criteria for determining the aluminum powder adhesion were judged as acceptable (、, ○) and rejected (Δ, ×) depending on the amount of aluminum powder adhered. When the aluminum powder adhesion amount is 0.0001 mg / m or less, it is indicated by “◎◎”, and when it exceeds 0.0001 mg / m and is 0.0002 mg / m or less, it is indicated by “」 ”and exceeds 0.0002 mg / m. The case of 0.0004 mg / m or less is indicated by “◯”. Further, “Δ” indicates a case where it exceeds 0.0004 mg / m and 0.0006 mg / m or less, and “X” indicates a case where it exceeds 0.0006 mg / m.
In addition, the coefficient of friction was determined to be acceptable when it was 0.2 or less.

<Aluminum wear powder evaluation>
Quantitative evaluation of aluminum wear powder generated in the fin press was performed.
Specifically, first, as shown in FIG. 2, a pin-on-disk test apparatus 5 similar to that used in the workability evaluation test was prepared. Next, the disk part 52 and the test material 59 of the pin-on-disk test apparatus 5 are arranged in the cup part 60, and the test is performed so that the disk part 52 and the test material 59 are immersed in the cup part 60. A certain amount (100 ml) of oil (samples E1 to E16 and samples C1 to C24) was supplied. And the load F (10 kgf) was provided to the support part 51, and the disk part 52 was rotated at the rotation speed of 30 rpm for 20 minutes under normal temperature. The rotation radius (distance from the center of the disk portion 52 to the center of the specimen 59) was 15 mm. Thereafter, the aluminum wear powder generated in each test oil was dissolved in hydrochloric acid, and the amount of the aluminum wear powder was quantified by atomic absorption spectrometry.

  The determination was made based on the amount of aluminum wear powder. The case where the aluminum wear powder is 10 ppm or more is indicated by “x”, the case of 5 to 10 ppm is indicated by “Δ”, and the case of less than 5 ppm is indicated by “◯”. “△” and “×” were rejected, and “◯” was accepted.

<Copper ant nest corrosive evaluation test>
6 mL of test oil (samples E1 to E16 and samples C1 to C24), 50 mL of distilled water, and 1 g of copper powder were added to a 100 mL beaker and heated in a constant temperature dryer at 90 ° C. for 48 hours. After cooling, about 2 mL of the aqueous layer was extracted, and the concentration of organic acid ions eluted in the aqueous layer was analyzed by ion chromatography. Analytical elements were formate ion, acetate ion, propionate ion and butyrate ion.
As a criterion, the case where the amount of elution into the aqueous layer was 5 ppm (mg / L) or less was regarded as acceptable and indicated by “「 ”. Cases exceeding 5 ppm (mg / L) were rejected and indicated by “x” marks.

<Oil persistence>
The test oil (sample E1 to sample E16 and sample C1 to sample 24) was dropped onto the material surface, and the contact angle formed between the material surface and the oil droplet was measured and evaluated.
As the judgment criteria, the case where the contact angle was 35 ° or less was accepted and indicated by “「 ”. The case of exceeding 35 ° was rejected and indicated by “x” mark.

<Odor evaluation test>
For each sample oil (sample E1 to sample E16 and sample C1 to sample 24), 10 people selected indiscriminately were allowed to smell and were judged as having no odor or having an odor, and were evaluated according to the number of people. ◎ ○ marked as acceptable.
The judgment criteria are “◎” when 10 people are judged as having no odor, “○” when 5 or more people are judged as having no odor, and “4” when 4 people are judged as having no odor. The case where there were one or more people was “Δ”, the case where there were no people who were judged as having no odor was “x”, and the more people, the better.

<Hand roughness evaluation test>
For each sample oil (sample E1 to sample E16 and sample C1 to sample 24), let 10 people selected indiscriminately touch with bare hands and have them feel uncomfortable, such as itching, and feel uncomfortable. evaluated. ◎ ○ marked as acceptable.
The judgment criteria are “◎” when there are 10 people who have determined that there is no discomfort, “○” when there are 9 or fewer people who have determined that there is no discomfort, and 4 people who have determined that there is no discomfort. The case where there were one or more people was “Δ”, the case where there were no people who judged that there was no sense of incongruity was “x”, and the more people, the better.

<Workability (freezing point)>
About each sample oil (sample E1-sample E16 and sample C1-sample 24), the DTA curve was calculated | required with the low-temperature DTA apparatus, the freezing point was measured, and if it was 20 degrees C or less, it was set as the pass. Among them, the case of 10 ° C. or lower was rated as “◎”, and the case of exceeding 10 ° C. and 20 ° C. or lower was rated as “◯”. Moreover, the case where it exceeded 20 degreeC was made disqualified, and it showed by "x" mark.

As can be seen from Table 4, at least one evaluation item of the lubricants of Samples C1 to C24 failed. On the other hand, as is known from Table 3, it was found that the lubricating oils of Samples E1 to E16 were excellent in passing all the evaluation items.
Moreover, it turns out that the said samples E1-E16 can suppress generation | occurrence | production of aluminum abrasion powder compared with the samples C14-C24 which do not contain the 2nd additive so that Table 3 and Table 4 may know.

  As described above, the fin press lubricants (samples E1 to E16) according to the examples of the present invention are free from problems such as odor and rough skin, are low in cost, have good drying properties, and are suitable for aggregation of aluminum powder on the punch. It can be seen that adhesion can be effectively suppressed and generation of aluminum wear powder can be suppressed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory perspective view illustrating a configuration of a pin-on-disk test apparatus according to an embodiment. Front explanatory drawing which shows a structure when the pin-on-disk test apparatus concerning an Example is arrange | positioned in a cup. Explanatory drawing which shows the processing method of the draw material and ironing combined method of a fin material in a prior art example.

Explanation of symbols

5 Pin-on-disk test equipment 59 Specimen

Claims (3)

In the fin press lubricating oil used when pressing the heat exchanger fin material made of an aluminum plate,
A base oil composed of non-aromatic mineral oil or / and isoparaffin;
A first additive comprising a fatty acid ester represented by the general formula R ₁ —COO—R ₂ (where R ₁ is an alkyl group having 7 to 17 carbon atoms and R ₂ is an alkyl group having 1 to 4 carbon atoms);
A second compound comprising at least one selected from aliphatic amines, alkanolamines, aliphatic polyamines, aromatic amines, alicyclic amines, heterocyclic amines, and their alkylene oxide adducts, alkylsulfonic acids, and salts thereof. Containing additives,
The content ratio of the first additive to the total amount of the first additive, the second additive, and the base oil is 1 to 10% by weight,
The content ratio of the second additive to the total amount of the first additive, the second additive and the base oil is 0.01 to 2.0% by weight,
And the viscosity of the said lubricating oil for fin presses is 1.0-3.5 mm < ² > / s by dynamic viscosity in the temperature of 40 degreeC, The lubricating oil for fin press characterized by the above-mentioned.   2. The fin press lubricant according to claim 1, wherein the fin press lubricant has a boiling point of 150 to 300 ° C. 3. In the manufacturing method of plate fins for producing heat exchanger plate fins by pressing a heat exchanger fin material made of an aluminum plate,
3. A plate fin manufacturing method using the fin press lubricant according to claim 1 or 2 at the time of pressing the heat exchanger fin material.

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