JPH08302277A - Coating material composition for fin, fin and its production - Google Patents

Abstract

PURPOSE: To obtain a coating composition containing an ester acid composed of a specific nonionic polymeric surfactant and a polybasic oxyacid, a reactive lubricity-imparting agent, a hydrophilic resin and a water-soluble epoxy compound and useful for forming a coating film having excellent water-wettability and processability on an Al fin of a heat-exchanger. CONSTITUTION: This coating material composition contains (A) a reactive lubricity-imparting agent composed of (i) an ester acid derived from a nonionic polymeric surfactant having a melting point of >=50 deg.C and a cloudiness number of >=15.5 (by Karabinos method) (e.g. polyoxyethylene alkyl ether or polyoxyethylene hardened castor oil ether) and a polybasic oxyacid (e.g. a dibasic oxyacid) and (ii) an induced basic compound, (B) a hydrophilic resin and (C) a water-soluble epoxy compound. The weight ratios (in terms of solid components) of A:B:C are preferably 100:(5-30):(78-200).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition used for forming a coating film on an aluminum fin for a heat exchanger, which is excellent in water wettability and workability, a fin coated with the coating composition and a method for producing the fin. Regarding

[0002]

BACKGROUND OF THE INVENTION Recently, room air conditioners have rapidly spread with the improvement of living standards, and the demand for fin materials for heat exchangers is extremely high. As the fin material, aluminum or aluminum alloy (simply Al), which is excellent in lightness, workability, and thermal conductivity, is widely used.

The fins incorporated in the heat exchanger are subjected to a chemical conversion treatment such as boehmite on the surface of the Al material for the purpose of improving the heat exchange efficiency, that is, in order to improve the water wettability of the fin. , Painting is done. In other words, not only to prevent corrosion of Al that is a fin material, but also to prevent an increase in ventilation resistance due to adhesion of condensed water generated during the operation of the heat exchanger and to prevent a decrease in heat exchange efficiency. , Chemical conversion treatment such as boehmite treatment or coating treatment is performed.

[0004] By the way, it is general that after the Al material is processed into a fin shape, a surface treatment such as a coating treatment is performed. However, recently, due to the simplification of the process and the uniformity of the coating film, the fin treatment is performed. There is an increasing expectation for a precoating method in which the surface of a coil made of an Al material before being processed into a sheet is coated, and thereafter the coil is processed into a fin shape. As such a precoating method, for example, a means has been proposed in which an aqueous coating material containing a surfactant or silica is applied to the coil surface and then processed into a fin shape (JP-A-55-164264).

That is, the action of silica and the surfactant present in the coating film spreads the condensed water adhering to the coating film and prevents the passage area of the air passing between the fins from decreasing. It aims to reduce the ventilation resistance and increase the air volume. However, in this proposal, since it is processed into a fin shape after applying an aqueous coating material containing a surfactant or silica, the durability of the mold is poor due to the silica present in the coating film, Therefore, the problem of high cost has occurred.

Therefore, after coating a coating containing a hydrophilic polymer compound and a cross-linking agent on the surface and curing it, it is treated with an alkaline aqueous solution, thereby roughening the surface roughness and improving the water wettability. Proposal of a technology for processing the fin shape after obtaining the coil (Japanese Patent Laid-Open No. 61-227877)
Have been. According to this, since silica is not present in the coating film, it is possible to prevent deterioration of the durability of the mold used for press working, but the hydrophilicity is not sufficient, It is necessary to treat the alkaline treatment waste liquid.

Furthermore, the Al fin press working method has been changed from a draw working method (overhanging, drawing) to a drawless working method (ironing). In addition, the use of cleaning-less volatile press oil that does not require degreasing with a chlorine-based solvent is expanding due to the problem of CFC regulations. By the way, under the present circumstances where such a strict processing method is adopted, drawless processing is performed after applying a low-viscosity cleaning-less processing oil to the coating film on the Al fin coated by the conventional coating technology. Then, it will run out of oil and interfere with press moldability.

Therefore, a liquid surfactant is used as a base on the surface of the Al material on which the hydrophilic resin film is formed, and a phosphorus-based extreme pressure additive, higher fatty acid, higher fatty acid is added to this base. Although a technique for applying a lubricant containing 0.1 to 20% of at least one substance selected from esters and higher alcohols has been proposed (Japanese Patent Publication No. 61-46190), this is formed from a lubricant. A film removal process is required, which is cumbersome and costly.

[0009]

DISCLOSURE OF THE INVENTION In order to solve the above-mentioned problems, the applicant of the present invention has found that the melting point of Karabino is 45 ° C. or higher.
Proposed coating composition for fins containing a nonionic polymer activator having a cloud number of 15.0 or more according to the s method (Japanese Patent Application No. 5-1
84104). Although this product was significantly superior to the previous products, it was relatively easily soluble in water, so there was a possibility that it might flow out due to condensed water during operation of the heat exchanger. .

As a result of intensive research on this point, it has been found that the problem can be solved by binding a nonionic polymer activator to a water-soluble epoxy resin or a hydrophilic resin. The present invention has been achieved based on such findings, and an object of the present invention is to provide a heat exchanger excellent in water wettability (heat exchange efficiency).

The object of the present invention is to use an ester acid composed of a nonionic polymer activator having a melting point of 50 ° C. or higher and a cloud number of 15.5 or higher according to the Karabinos method, and a polybasic oxygen acid. And a reactive lubricity imparting agent composed of an organic basic compound, a hydrophilic resin, and a water-soluble epoxy compound. To be done.

Further, the present invention is achieved by a fin characterized in that the coating composition for fins is applied to the surface of an Al material. Further, it can be achieved by a method for producing a fin, which comprises applying the coating composition for fins to the surface of an Al material and then pressing into a predetermined shape. In the present invention, the one having a melting point of 50 ° C. or higher is selected because, in Japanese Patent Application No. 5-184104, the nonionic polymer activator is used without modification, whereas the nonionic polymer activator (I ) And a polybasic oxygen acid (II) to give an ester acid (III), and the ester acid (III) and an organic basic compound (IV) are reacted to give a reactive lubrication agent (V). This is because the reactive lubricity imparting agent (V), the hydrophilic resin (VI) and the water-soluble epoxy compound (VII) were used. That is, the reactive lubrication agent (V)
Since the melting point is lower than that of the nonionic polymer activator (I), a relatively high one is used in advance. By the way, when a nonionic polymer activator having a low melting point of less than 50 ° C. is used, the reactive lubricity imparting agent (V), the hydrophilic resin (VI) and the water-soluble epoxy compound (VII) composed of the nonionic polymer activator are used. The coating film using and was easy to peel off. The fin material Al is wound into a coil before being processed into fins, and is unwound at the processing stage. At this time, if the adhesion of the coating film provided on the coiled Al surface is low, peeling occurs when unwinding. Therefore, it is important that the adhesiveness is excellent. In order to satisfy this demand, a requirement that the melting point is 50 ° C. or higher is required.

The reason why the cloud number by the Karabinos method is 15.5 or more is selected because the wettability of the coating film formed on the surface of the Al material is greatly influenced. That is, when a nonionic polymer activator having a haze number of less than 15.5 according to the Karabinos method was used, it was not possible to secure the water wettability suitable for the fin. Furthermore, the nonionic polymer activator (I) was selected because of the synergistic action of the polyoxyethylene group of the nonionic polymer activator and the alkyl group or alkylphenyl group, which is a hydrophobic group, of the Al material. This is because it was excellent in press workability, particularly in lubrication characteristics during drawless work. That is, there is little damage to the mold, and the fin can be manufactured with good work efficiency.

The nonionic polymer activator (I) used in the present invention is, for example, polyoxyethylene alkyl ether, polyoxyethylene alkylphenyl ether, polyoxyethylene alkyl fatty acid amide, polyoxyethylene hydrogenated castor oil ether, Of polyoxyethylene 12-hydroxystearate, polyoxyethylene alkyl fatty acid ester, polyoxyethylene glycerin alkyl fatty acid mono or diester, polyoxyethylene trimethylolpropane alkyl fatty acid mono or diester, polyoxyethylene pentaerythritol alkyl fatty acid mono or diester Kar selected from the group by addition of ethylene oxide
It is preferable that the cloud number according to the abinos method is 15.5 or more. In particular, the melting point is about 50 to 65 ° C.
A nonionic polymer activator having a polyethylene oxide chain having a cloud number by the Nos method of about 16.5 to 19 is preferable.

In order to react the nonionic polymer activator with the hydrophilic resin (VI) and the water-soluble epoxy compound (VII), the nonionic polymer activator is reacted with the polybasic oxygen acid (II). To give an ester acid (III), and the ester acid (III) was reacted with the organic basic compound (IV). As a result, the nonionic polymer activator is added to the hydrophilic resin (VI) or the water-soluble epoxy compound (VII).
, And there is no risk of outflow due to condensed water during operation of the heat exchanger.

The present invention will be described in detail below. First, the cloud number by the Karabinos method in the present invention will be described. In the surfactant industry, a method based on cloud point measurement is sometimes used to estimate the structure of an ethylene oxide nonionic surfactant, that is, to estimate the number of moles of ethylene oxide added. This cloud point has a specific relationship with the hydrophilic group / hydrophobic group (weight ratio), and the cloud point rises as the number of added moles of ethylene oxide increases. Therefore, if this relationship is obtained in advance for a known sample, the number of moles of ethylene oxide added can be estimated by measuring the cloud point. However, some of them cannot be measured because the cloud point is 0 ° C. or lower or 100 ° C. or higher.

Therefore, in addition to the cloud point measurement, Karab
The method by phenol titration of inos was adopted. This method is generally referred to as a method for measuring the cloud number in the field of surfactants, and the principle is that when an ethylene oxide nonionic surfactant is titrated with a phenol solution, a milky white color is obtained. It is believed that the amount of phenol (which is referred to as the cloud number) is related to the chain length of ethylene oxide, and if the hydrophobic group is known, the chain length of the nonionic activator ethylene oxide can be estimated. That is, the characteristic of the nonionic polymer activator is largely changed depending on the value of the cloud number.

Then, as a result of earnestly studying the cloud number, a nonionic polymer activator (I) having a cloud number of 15.5 or more by Karabinos method and a melting point of 50 ° C. or more was selected. The specific nonionic polymer activator (I) is reacted with the polybasic oxygen acid (II) to form an ester acid (III), and the ester acid (II)
I) and the organic basic compound (IV) are reacted to obtain the reactive lubrication agent (V), and the reactive lubrication agent (V), the hydrophilic resin (VI) and the water-soluble epoxy compound (VII) are obtained.
By interposing a coating film composed of a paint using and on the surface of the Al material, it is possible to obtain excellent fining properties with excellent lubrication characteristics during press working, especially drawless working, and to prevent damage to the die, and to improve work efficiency. understood. In addition, this product does not have the risk of flowing out due to condensed water during the operation of the heat exchanger, and has an environmentally friendly characteristic.

The melting point is about 50 to 65 ° C. and the Kara
It was particularly preferable when the nonionic polymer activator (I) having a polyethylene oxide chain having a cloud number of about 16.5 to 19 by the binos method was used. Melting point is 5
At 0 ° C or higher, the number of haze according to Karabinos method is 15.
The 5 or more nonionic polymer activators are obtained as follows.

For example, a) straight-chain or side-chain alkyl or alkylene alcohol having 8 to 22 carbon atoms b) 1 straight-chain or side-chain alkyl group having 4 to 12 carbon atoms
To 3 alkylphenols c) C8-C22 linear or side chain alkyl fatty acid amides d) hydrogenated castor oil, 12-hydroxystearic acid e) C8-C22 straight chain or side chain alkyl fatty acids f ) Glycerin, trimethylolpropane,
About 0.1 to 1.0 wt% of sodium hydroxide, potassium hydroxide, sodium metal or the like as a catalyst is added to a mono- or diester of a linear or side chain alkyl fatty acid having 12 to 22 carbon atoms of pentaerythritol, and the mixture is pressurized. A) polyoxyethylene alkyl ether B) polyoxyethylene alkyl phenyl ether C) polyoxyethylene alkyl fatty acid amide D) polyoxyethylene hydrogenated castor oil by reacting while blowing a specified amount of ethylene oxide at 100 to 200 ° C. Ether Polyoxyethylene 12-hydroxystearate ester E) Polyoxyethylene alkyl fatty acid ester F) Polyoxyethylene glycerin alkyl fatty acid mono or diester Polyoxyethylene trimethylolpropa Alkyl fatty acid mono or diester Polyoxyethylene pentaerythritol alkyl fatty acid mono or diester is obtained. Of course, these nonionic polymer activators (I) have a melting point of 50 ° C. or higher, and
Ethylene oxide is added so that the cloud number by the method becomes 15.5 or more.

The catalyst used and the reaction temperature are not limited to those mentioned above. The nonionic polymer activator (I) is reacted with a polybasic oxygen acid (for example, dibasic oxygen acid, II) to give an ester acid (II
To obtain I): That is, 2 mol of an anhydride of a dibasic oxygen acid (dicarboxylic acid) such as succinic acid, maleic acid, glutaric acid and adipic acid was added to 1 mol of the nonionic polymer activator (I), and the mixture was heated at 80 ° C. for 2 hours. ,
By reacting at 110 ° C. for 3 hours and at 125 ° C. for 1 hour, an ester acid (III) represented by the following general formula
Is obtained. A) Polyoxyethylene alkyl ether dibasic oxygen acid monoester acid R ₁ O (CH ₂ CH ₂ O) _n OC-X-COOH n = 50 to 250 b) Polyoxyethylene alkylphenyl ether dibasic oxygen acid monoester ester acid _{R 2 -Φ-O (CH 2} CH 2 O) n OC-X-COOH n = 50~250 c) polyoxyethylene alkylolamides dibasic oxygen acid mono- or diester acid R ₃ CONH (CH ₂ CH ₂ O) _n OC-X-COOH n = 50 to 250 R ₃ CON [(CH ₂ CH ₂ O) _n OC-X-COOH] [(CH ₂ CH ₂ O) _m OC-X-COOH] n + m = 50 ~ 250 d) Polyoxyethylene hydrogenated castor oil ether dibasic oxygen acid triester acid

[0022]

Embedded image

Polyoxyethylene 12-hydroxystearic acid ether ester dibasic oxyacid diester acid

[0024]

Embedded image

E) Polyoxyethylene alkyl fatty acid ester dibasic oxygen acid monoester acid R ₃ COO (CH ₂ CH ₂ O) _n OC-X-COOH n = 50 to 250 f) Polyoxyethylene glycerin mono- or dialkyl fatty acid Ether ester dibasic oxygen acid di or monoester acid

[0026]

Embedded image

Polyoxyethylene trimethylolpropane mono- or dialkyl fatty acid ether ester dibasic oxygen acid di- or monoester acid

[0028]

[Chemical 4]

Polyoxyethylene pentaerythritol mono- or dialkyl fatty acid ether ester dibasic oxygen acid di- or monoester acid

[0030]

Embedded image

Ester acids represented by these general formulas (I
II) is reacted with an organic basic compound (IV) to obtain a reactive lubrication agent (V). Examples of the organic basic compound (IV) used include: 1) ammonia 2) mono-, di- or trialkylamines having 1 to 3 carbon atoms 3) mono-, di- or triacrylamine 4) mono- or mono- or dialkyl groups having 1 to 3 carbon atoms Dialkylalkylolamine 5) Trialkyl having 1 to 3 carbon atoms and / or a mixed alkylamine thereof and / or benzyl group and / or 1 carbon atom
Examples thereof include hydroxyammonium salts composed of mixed amines with alkyl groups of 3 to 3.

Then, the reactive lubrication agent (V) is obtained by adjusting these to a specified pH by a usual neutralization method. The preferred pH is 7-9. Ie pH
When is less than 7, the ester bond in the reactive lubricity imparting agent (V) is likely to cause hydrolysis. On the contrary, when the pH exceeds 9, the organic basic compound (I
V) decomposes the epoxy groups in the coating film of the present invention, so that the epoxy groups cannot fully serve as a crosslinking agent,
This is because there was a tendency to lower the adhesion of the coating film.

In the present invention, the above reactive lubricity imparting agent (V) is used.
Besides, a hydrophilic resin (VI) is used. The hydrophilic resin (VI) may be of any type, but the following ones are preferable. For example, a conjugated monomer (a) having a nitrile group, a conjugated monomer having a hydroxy group and /
Alternatively, a non-conjugated monomer (b), a conjugated monomer having a carboxyl group (c), a conjugated monomer having a saturated and / or alicyclic alkyl group having 1 to 6 carbon atoms (d), A copolymer (α) composed of a conjugated and / or non-conjugated monomer (e) having a sulfonic acid group and a phosphate compound (f) is preferable.

Examples of the conjugated monomer (a) having a nitrile group include acrylonitrile, methacrylonitrile, 2-cyanoethyl acrylate and 2-cyanoethyl methacrylate. Of these, acrylonitrile is a preferred example. The nitrile group in the monomer (a) has a remarkably high dipole efficiency due to the π-electrons derived from the C≡N bond, so that the resin (copolymer (α)) has high hydrophilicity. . In addition, the adhesion to the Al material is increased.

As the monomer (b), for example, 2-hydroxyethyl vinyl ether, 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 2-
Hydroxypropyl methacrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl methacrylate, 3-hydroxypropyl acrylate, 2-hydroxybutyl methacrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl methacrylate,
4-hydroxybutyl acrylate, 2,3-dihydroxypropyl methacrylate, 2,3-dihydroxypropyl acrylate and the like can be mentioned. Among them, 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 2,3-dihydroxypropyl methacrylate and 2,3-dihydroxypropyl acrylate are preferable.

Examples of the monomer (c) include acrylic acid, methacrylic acid, maleic anhydride, crotonic acid, itaconic acid, fumaric acid, and half esters of these acids. Of these, acrylic acid and methacrylic acid are preferable. These monomers (c) have a function of having anionic hydrophilicity, and increase the hydrophilicity of the neutralized product with the organic basic compound (IV) or the alkali metal hydroxide. The neutralized product with the organic basic compound (IV) reacts with the reactive lubrication agent (V) through the water-soluble epoxy resin (VII) to form a coating film on the surface of the Al material. The film has excellent adhesion, processability, mechanical strength (toughness), and flexibility.

Examples of the monomer (d) include methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, propyl methacrylate, propyl acrylate, butyl methacrylate, butyl acrylate, amyl methacrylate, amyl acrylate, hexyl methacrylate, hexyl acrylate,
Cyclohexyl methacrylate, cyclohexyl acrylate, dimethyl maleate, diethyl maleate, methyl fumarate, ethyl fumarate, methyl clonate, ethyl clonate, methyl itaconate, ethyl itaconate, methyl monomaleate, ethyl monomaleate, methyl mono Fumarate, ethyl monofumarate,
Examples thereof include methyl monoitaconate and ethyl monoitaconate. Of these, methyl methacrylate, methyl acrylate, ethyl methacrylate, ethyl acrylate, dimethyl maleate, dimethyl fumarate and the like are preferable. These monomers (d) lower the glass transition temperature of the copolymer (α) and improve the adhesiveness, mechanical strength (toughness), flexibility and processability of the coating film.

Examples of the monomer (e) include aryl sulfonic acid, sodium metalyl sulfonate, potassium metalyl sulfonate, sodium vinyl sulfonate,
Examples thereof include potassium vinyl sulfonate, sodium 2-methyl-2-sulfopropylacrylamide, potassium 2-methyl-2-sulfopropylacrylamide, and the like.
Among them, sodium vinyl sulfonate, potassium vinyl sulfonate, sodium 2-methyl-2-sulfopropylacrylamide, potassium 2-methyl-2-sulfopropylacrylamide and the like are preferable. Since these monomers (e) are negative in organic electron theory due to the effect of unpaired electrons which S itself has, they improve the adhesion to the Al material and, at the same time, increase the water content of the sulfonic acid group and the alkali metal. The salt formed with the oxide improves the hydrophilicity of the copolymer (α) (hydrophilic resin (VI)).

Examples of the phosphite compound (f) include hypophosphite such as sodium hypophosphite and potassium hypophosphite, and phosphite such as sodium phosphite and potassium phosphite, Particularly, hypophosphorous acid and alkali metal salts of phosphorous acid can be mentioned. These phosphate compounds (f) are P
Since it has a negative effect on the organic electron theory due to the effect of the unpaired electron of itself, it improves the adhesion to the Al material and also improves the workability by the extreme pressure of P on the metal.

An addition polymerization reaction, for example, a polymerization reaction in an aqueous medium, is carried out using the above monomers. The mixing ratios of the monomer (a), the monomer (b), the monomer (c), the monomer (d) and the monomer (e) are as follows: monomer (a) / monomer ( The weight ratio of b) / monomer (c) / monomer (d) / monomer (e) is 5 to 27/3 to 15/35 to 65 / 0.5 to 7
/ 0-30 (more desirably, 13-23 / 6-13 /
45 to 65/2 to 4/10 to 20) are preferable. Further, the compounding ratio of the phosphate compound (f) is such that the monomer (a), the monomer (b), the monomer (c), the monomer (d) and the monomer (e) are mixed.
The total amount is preferably 0.05 to 25 parts by weight (more preferably 2 to 20 parts by weight). A polymerization initiator is added to such a compounded composition to carry out the reaction. As the polymerization initiator, those used in the vinyl polymerization reaction can be used, but water-soluble ammonium persulfate, potassium persulfate, hydrogen peroxide solution are preferable, or sodium metasulfite, sodium thiosulfate, etc. Can also be used together. Incidentally, such a polymerization initiator is added in an amount of 0.1 to 100 parts by weight based on the total amount of the above monomers.
10 parts by weight is preferred. The polymerization temperature is 0 to 100 ° C. in the case of a redox system, and 58 to 110 ° C. in the case of a radical polymerization system.

Copolymer (α) obtained as a result of polymerization reaction
Has an average molecular weight of 1,000 to 50,000 (preferably 2
000-35000) is preferable. The copolymer (α) is partially neutralized with the organic basic compound (IV) and the alkali metal hydroxide to give a hydrophilic resin (V).
I). In this neutralization, all sulfonic acid groups are neutralized with an alkali metal hydroxide, and carboxylic acid groups are neutralized with an organic basic compound (IV) and an alkali metal hydroxide. . The neutralization treatment may be performed after the polymerization operation or in the state of the monomer before the polymerization. The degree of neutralization is preferably about pH 4-9. Examples of the organic basic compound (IV) include the amine compounds described above. The compounding amount of the organic basic compound (IV) is 3 to 1 with respect to 100 parts by weight of the copolymer (α).
5 parts by weight (desirably 5 to 12 parts by weight) is preferable. Examples of alkali metal hydroxides include lithium hydroxide, sodium hydroxide and potassium hydroxide. Of these, potassium hydroxide is preferred. And
The amount of the alkali metal hydroxide compounded is preferably 0.1 to 7 parts by weight (desirably 0.5 to 5.5 parts by weight) with respect to 100 parts by weight of the copolymer (α).

The water-soluble epoxy compound (V
Examples of II) include diglycidyl ether of polyglycol in which 2 to 6 mol of ethylene oxide is added to glycerin, polyethylene glycol diglycidyl ether of 4.5 to 91 mol of ethylene oxide in ethylene glycol, and ethylene in propylene glycol. Examples include polypropylene glycol diglycidyl ether having 2 to 6 mol of oxide added thereto. Among them, polyethylene glycol diglycidyl ether is preferable.

Reactive lubricity imparting agent (V), hydrophilic resin (VI) and water-soluble epoxy compound (VII) used in the present invention.
And the ratio (in terms of solid content) of hydrophilic resin (VI): reactive lubricant (V): water-soluble epoxy compound (VII)
= 100: 5 to 30:78 to 200 (preferably 10
0: 7 to 21: 100 to 180) is preferable. And
The dynamic friction coefficient of the film obtained by applying the coating composition containing the reactive lubrication agent (V), the hydrophilic resin (VI), and the water-soluble epoxy compound (VII) was measured by a Bowden friction tester. It was 0.1 or less. The coating film was also highly hydrophilic. Incidentally, when the reactive lubrication agent (V) was not used, the dynamic friction coefficient was 0.15 or more.

Reactive lubricity imparting agent (V), hydrophilic resin (V
The coating composition formed by coating the coating composition containing I) and the water-soluble epoxy compound (VII) on the surface of the coil made of Al material has a thickness of 0.5 to 5 μm (preferably 1 μm).
˜2 μm) is preferred. As a coating means, brush coating,
Appropriate means such as dipping, spraying, electrostatic coating, roll coater and the like can be used. Any known means can be used for drying, but it may be maintained at a temperature of 180 ° C. to 250 ° C. for 10 seconds to 90 seconds.

In this manner, the Al material having the coating composition of the present invention applied on its surface is subjected to predetermined processing (for example, drawless processing) to form fins. At the time of this processing, since the coating film of the coating composition according to the present invention is provided on the surface of the Al material, the durability of the mold is high. That is, since the coating film according to the present invention, which is provided on the surface of the Al material, has a lubricating function, the mold is less likely to be damaged. Moreover, since the coating film exhibiting the function of lubricity does not contain a component such as silica, the mold is less likely to be damaged.

Further, the coating film of the present invention formed on the surface of the obtained fin has hydrophilicity and is excellent in water wettability. Therefore, the coating film may be incorporated in the heat exchanger without being removed. It is more preferable to provide a film having corrosion resistance under the coating film of the present invention.

Hereinafter, the present invention will be specifically described with reference to examples.

[0048]

【Example】

[Nonionic polymer activator I-1 (polyoxyethylene (50) -2-ethylhexyl ether)] 2-ethylhexyl was added in a 1000 ml autoclave equipped with a stirrer, a thermometer, an ethylene oxide introducing tube, a safety valve and a pressure reducing tube. 52 g of alcohol and 4 g of potassium hydroxide are charged, and the inside of the autoclave is replaced with nitrogen gas while stirring.

Then, the internal temperature is raised to 120 ° C. and 60 g of ethylene oxide is blown into the autoclave. This causes the temperature to rise, so the reaction proceeds until the temperature drops. When the temperature drops to 130 ° C., 100 g of ethylene oxide are introduced again. This causes the temperature to rise, so the reaction proceeds until the temperature drops.
This is repeated to introduce a total of 900 g of ethylene oxide. After the introduction of 900 g of all ethylene oxide was completed, the temperature was raised to 180 ° C. to carry out an aging reaction, followed by cooling while blowing nitrogen gas to obtain white solid polyoxyethylene (50) -2-ethylhexyl ether. [CH ₃ CH ₂ CH ₂ CH ₂ CH (CH ₂ CH ₃ )
950 g of CH ₂ O (CH ₂ CH ₂ O) ₅₀ H] was obtained.

[Nonionic polymer activators I-2 to I-
9] In the same manner as [Nonionic polymer activator I-1],
With the composition shown in Table 1 above, nonionic polymer activator I-
2 to I-9 were obtained. Table-1 Nomaterial Catalyst Ethylene Oxygen Yield Compound Charge (g) Compound Charge (g) Side (g) (g) 2 Nonylphenol 44 NaOH 4 900 935 3 Stearamide 28.3 KOH 3.5 675 690 4 Hydrogenated Castor Oil 28. 2 NaOH 7 820 830 5 12-hydroxystearic acid 24 KOH 8 900 910 6 stearic acid 28.4 NaOH 4.5 900 920 7 glycerine monobehenate 29 KOH 5.6 820 840 8 A 26 KOH 4.8 900 810 9 B 28.1 KOH 5 785 995 * A = trimethylolpropane-di (2-ethylhexoate) * B = pentaerythritol monostearate The nonionic polymer activator I-2 is a pale yellow solid poly.
Oxyethylene (100) nonyl phenyl ether [C
H₃(CH₂)₇CH₂-Φ-O (CH₂CH ₂O)
₁₀₀H].

The nonionic polymer activator I-3 is a white solid polyoxyethylene (150) stearic acid amide ether [CH ₃ (CH ₂ ) ₁₅ CH ₂ CON {(CH ₂ C
H ₂ O) _m H} (CH ₂ CH ₂ O) _n H where m + n
= 150]. Nonionic polymeric activator I-4 is a white solid polyoxyethylene (200) hydrogenated castor oil ether.

The nonionic polymer activator I-5 is white solid polyoxyethylene (250) 12-hydroxystearate ester [CH ₃ (CH ₂ ) ₄ CH
{O (CH ₂ CH ₂ O) _m H} (CH ₂ ) ₁₀ CH ₂ CO
O (CH ₂ CH ₂ O) _n H, where m + n = 250]. The nonionic polymer activator I-6 is a white solid polyoxyethylene (200) stearic acid ester [CH
₃ (CH ₂ ) ₁₅ CH ₂ COO (CH ₂ CH ₂ O)
₂₀₀ H].

The nonionic polymer activator I-7 is white solid polyoxyethylene (250) glycerin monobehenate ether [CH ₃ (CH ₂ ) ₁₉ CH ₂ COOCH ₂
CH {O (CH ₂ CH ₂ O) _n H} CH ₂ O (CH ₂ C
H ₂ O) _m H However, m + n = 250]. Nonionic polymeric activator I-8 is a white solid polyoxyethylene (250) trimethylolpropane-di (2-ethylhexoate) ether.

The nonionic polymer activator I-9 is white solid polyoxyethylene (250) pentaerythritol monostearate ether. [Nonionic polymer activator (I) and dibasic oxygen acid (I
Ester acid with I) III-1] In a 1000 ml four-necked flask equipped with a stirrer, a thermometer, a reflux condenser and a nitrogen introducing tube, the nonionic polymer activator I-1 was added to 699
g and 30 g of succinic anhydride are charged, and the internal temperature is raised to 80 ° C. and stirred under a nitrogen stream.

The reaction is carried out at this temperature for 2 hours, and then 110 ° C.
The reaction is carried out for 3 hours at 125 ° C. for 1 hour. After that, when cooled, monooxyethylene succinate (50)
2-Ethylhexyl ether ester acid [CH ₃ (C
H ₂ ) ₄ CH (CH ₂ CH ₃ ) CH ₂ O (CH ₂ CH ₂
O) ₅₀ COCH ₂ CH ₂ COOH] (720 g) was obtained. [Ester acid III-2 to III-9] [Ester acid I
II-1] in the same manner as described in Table 2 below, the nonionic polymer activator (I) and the dibasic oxygen acid (II) are blended.
And ester acids III-2 to III-9 were obtained.

Table-2 No Nonionic Polymeric Activator Dibasic Oxygen Acid Ester Acid 2 I-2 924 g Maleic Anhydride 19.6 g Light Brown Solid 938 g 3 I-3 688 g Glutaric Anhydride 11.4 g Light Yellow Solid 693 g 4 I -4 775 g Adipic anhydride 10.2 g Light yellow solid 780 g 5 I-5 798 g Succinic anhydride 7 g Light yellow solid 800 g 6 I-6 798 g Maleic anhydride 7.8 g Light brown solid 794 g 7 I-7 799 g Glutaric acid 8.0 g Light Yellow solid 801g 8 I-8 796g Adipic anhydride 9.0g Light yellow solid 800g 9 I-9 798g Adipic anhydride 9.0g Light yellow solid 800g Ester acid III-2 is maleic acid polyoxyethylene (100) nonylphenyl ether ester acid Is.

Ester acid III-3 is polyoxyethylene glutaric acid (150) stearic acid amide ether ester acid. Ester acid III-4 is a polyoxyethylene (200) adipic acid hydrogenated castor oil ether ester acid. Ester acid III-5 is polyoxyethylene (250) 12-hydroxystearate ester ether ester acid succinate.

Ester acid III-6 is a maleic acid polyoxyethylene (200) stearic acid ester ester acid. Ester acid III-7 is a glutaric acid polyoxyethylene (250) glycerin monobehenate ether ester acid. Ester acid III-8 is polyoxyethylene (250) trimethylolpropane-di (2-ethylhexoate) ether ester adipic acid.

Ester acid III-9 is polyoxyethylene (250) pentaerythritol monostearate ether ester adipic acid. [Reactive Lubrication Agent V-1 Comprising Ester Acid (III) and Organic Basic Compound (IV)] In a 10 L four-necked flask equipped with a stirrer, thermometer, dropping funnel and reflux condenser, the ester was added. Charge 2430 g of acid III-1 and 5000 g of ion-exchanged water, and mix and stir at 40 to 45 ° C. for 1 hour to complete dissolution.

Next, 50.5 g of triethylamine was added dropwise, mixed and stirred thoroughly, and 25% aqueous ammonia was added to 1 part.
7.5 g was added, and the mixture was further stirred at 50 to 55 ° C. for 2 hours. After cooling the internal temperature to 40 ° C or less, p
H was adjusted to 7.5, after which the concentration was measured by the Kett method,
Ion-exchanged water was added to adjust the concentration to 40%. As a result, a pale yellow liquid reactive lubrication additive V-1 having a pH of 7.52 and a concentration of 40.1% was obtained.

[Reactive Lubrication Agents V-2 to V-9] In the same manner as [Reactive Lubrication Agent V-1], the composition shown in Table 3 below was used to prepare the reactive lubrication agents V-2 to V-9. V-9 was obtained. Table-3 No Ester acid ABCD Reactive lubricator type (g) (g) (g) (g) (g) pH concentration% Appearance 2 III-2 3774 14 40.4 − − 7.52 40.0 Brown liquid 3 III -3 3498 8.75 25.25 − − 7.51 40.1 Light yellow liquid 4 III-4 2960 5.25 15.15 − − 7.56 40.1 Light yellow liquid 5 III-5 2850 4.38 7.56 7.45 − 7.55 40.4 Light yellow liquid 6 III-6 2754 3.5 6.06 5.96 − 7.50 40.5 Brown liquid 7 III-7 2882 4.38 7.56 7.45 − 7.54 40.2 Light yellow liquid 8 III-8 2868 4.38 7.56 7.45 − 7.52 40.1 Light yellow liquid 9 III-9 2882 3.5 7.56 7.45 22.75 7.55 40.0 Light yellow liquid * A = Ammonia water B = triethylamine C = triethanolamine D = tetramethylammonium hydroxide 10% aqueous solution [copolymer α-1] Stirrer, reflux condenser, thermometer, dropping funnel and 1 L five-necked port equipped with nitrogen gas inlet tube In a flask, 405 g of ion-exchanged water, sodium hypophosphite 10
g, ammonium persulfate 20 g, acrylonitrile 10
0 g, 2-hydroxyethyl methacrylate 20 g,
2,3-Dihydroxypropyl acrylate 30 g, acrylic acid 120 g, crotonic acid 10 g, maleic anhydride 30 g, itaconic anhydride 50 g, methyl acrylate 5
g, n-butyl acrylate 3 g, n-amyl methacrylate 1 g, cyclohexyl methacrylate 1 g, sodium arylsulfonate 20 g, 2-hydroxy-3-acryloxypropane-1-sulfonate potassium 10 g,
And 5 g of potassium 2-acrylamido-2-methylpropane-1-sulfonate were charged, and a redox polymerization reaction was carried out at a polymerization temperature of 45 to 50 ° C. for 13 hours under a nitrogen gas stream to obtain a copolymer having a concentration of 51.1%. α-1 was obtained.

[Copolymer α-2] In the same manner as in [Copolymer α-1], 405 g of ion-exchanged water and sodium hypophosphite 1
4 g, potassium persulfate 28 g, acrylonitrile 80
g, 2-cyanoethyl acrylate 20 g, 2-hydroxyethyl acrylate 30 g, 2-hydroxyethyl vinyl ether 20 g, acrylic acid 100 g, crotonic acid 80 g, maleic anhydride 30 g, methyl acrylate 5 g, n-butyl acrylate 3 g, n-amyl methacrylate 1 g. , And cyclohexyl methacrylate 1g
Was charged and the redox polymerization reaction was carried out for 8 hours to obtain a copolymer α-2 having a concentration of 51.8%.

[Hydrophilic Resins VI-1 to VI-6] Ion exchanged water 4 was added to a 1 L five-necked flask equipped with a stirrer, reflux condenser, thermometer, dropping funnel and pH meter insertion tube.
00 g and copolymer α are charged as shown in Table 4, an organic basic compound and an alkali metal hydroxide are added from a dropping funnel while stirring, and the reaction is carried out at a temperature of 40 to 45 ° C. for 2 hours. Then, after adjusting the pH with 25% ammonia water, the concentration was measured and confirmed by the Kett method, and ion-exchanged water was added to adjust the concentration to about 20% to obtain a hydrophilic resin VI.

Table-4 No Copolymer Organic Basic Compound Hydroxide pH Concentration (%) Viscosity (cps) 1 α-1 400g Ammonia 21.5g NaOH 1.6g 6.5 20.1 55 Triethylamine 5.1g 2 α-1 400g Ammonia 20.5 g NaOH 1.0g 7.1 20.0 60 Diethanolamine 7.4g 3 α-1 400g Ammonia 18.5g KOH 0.5g 7.7 20.5 59 (CH ₃ ) ₄ NOH 0.3g N, N-diethylethanolamine 8.0g 4 α-2 400g Ammonia 20.0g NaOH 0.8g 6.4 20.4 34 Triethylamine 4.3g 5 α-2 400g Ammonia 18.7g NaOH 1.1g 7.2 20.2 38 Diethanolamine 6.3g 6 α-2 400g Ammonia 15.3g KOH 0.6g 7.5 20.0 38 (CH ₃ ) ₄ NOH 0.4g N, N -Diethylethanolamine 7.1 g [water-soluble epoxy compounds VII-1 to VII-9] Table-
A water-soluble epoxy compound VII shown in 5 was prepared.

Table-5 PEG content Viscosity (cps) Appearance Water solubility (%) Epoxy equivalent (WPE) VII-1 88 35 colorless liquid 100 170 VII-2 176 206 colorless liquid 100 163 VII-3 100 14 colorless liquid 100 121 VII-4 400 66 colorless liquid 100 195 VII-5 600 160 light yellow liquid 100 382 (boiling point 24 ° C) VII-6 750 340 light yellow liquid 100 453 (boiling point 38 ° C) VII-7 1000 light yellow solid 100 578 (melting point) 45 ° C) VII-8 2000 Light yellow solid 100 982 (melting point 52 ° C) VII-9 4000 Light yellow solid 100 1540 (melting point 58 ° C) Water-soluble epoxy compound VII-1

[0066]

[Chemical 6]

Water-soluble epoxy compound VII-2

[0068]

[Chemical 7]

Water-soluble epoxy compound VII-3

[0070]

Embedded image

Water-soluble epoxy compound VII-4

[0072]

[Chemical 9]

Water-soluble epoxy compound VII-5

[0074]

[Chemical 10]

Water-soluble epoxy compound VII-6

[0076]

[Chemical 11]

Water-soluble epoxy compound VII-7

[0078]

[Chemical 12]

Water-soluble epoxy compound VII-8

[0080]

[Chemical 13]

Water-soluble epoxy compound VII-9

[0082]

Embedded image

[Coating Composition] A coating composition (concentration 20%) having the composition shown in Table 6 below was prepared. Table-6 Lubricity imparting agent Hydrophilic resin Water-soluble epoxy compound Ion-exchanged water Example 1 V-1 20g VI-1 100g VII-1 80g 340g Example 2 V-2 20g VI-2 100g VII-1 80g 340g Example 3 V-3 20g VI-3 100g VII-1 80g 340g Example 4 V-4 20g VI-1 100g VII-2 80g 340g Example 5 V-5 20g VI-2 100g VII-2 80g 340g Example 6 V-6 20g VI-3 100g VII-2 80g 340g Example 7 V-7 20g VI-1 100g VII-3 80g 340g Example 8 V-8 20g VI-2 100g VII-3 80g 340g Example 9 V- 9 20g VI-3 100g VII-3 80g 340g Example 10 V-1 15g VI-1 100g VII-4 100g 415g Example 11 V-2 15g VI-2 100g VII-4 100g 415g Example 12 V-3 15g VI-3 100g VII-4 100g 415g Example 13 V-4 15g VI-1 100g VII-5 100g 415g Example 14 V-5 15g VI-2 100g VII-5 100g 415g Example 15 V-6 15g VI- 3 100g VII-5 100g 415g Example 16 V-7 15g VI-1 100g VII-5 100g 415g Example 17 V-8 15g VI-2 100g VII-6 100g 415g Example 18 V-9 15g VI-3 100g VII-6 100g 415g Example 19 V-1 10g VI-4 100g VII-7 180g 730g Example 20 V-2 10g VI-5 100g V II-7 180g 730g Example 21 V-3 10g VI-6 100g VII-7 180g 730g Example 22 V-4 10g VI-4 100g VII-8 100g 730g VII-5 80g Example 23 V-5 10g VI- 5 100g VII-8 100g 730g VII-5 80g Example 24 V-6 10g VI-6 100g VII-8 100g 730g VII-5 80g Example 25 V-7 10g VI-4 100g VII-9 50g 730g VII-5 100g Example 26 V-8 10g VI-5 100g VII-9 50g 730g VII-5 100g Example 27 V-9 10g VI-6 100g VII-9 50g 730g VII-5 100g Example 28 V-1 7g VI- 4 100g VII-6 160g 647g Example 29 V-2 7g VI-5 100g VII-6 160g 647g Example 30 V-3 7g VI-6 100g VII-6 160g 647g Example 31 V-4 7g VI-4 100g VII-6 160g 647g Example 32 V-5 7g VI-5 100g VII-6 160g 647g Example 33 V-6 7g VI-6 100g VII-6 160g 647g Example 34 V-7 7g VI-4 100g VII- 6 160g 647g Example 35 V-8 7g VI-5 100g VII-6 160g 647g Example 36 V-9 7g VI-6 100g VII-6 160g 647g Example 37 V-1 11g VI-1 100g VII-7 180g 736g V-4 5g Example 38 V-2 11g VI-2 100g VII-7 180g 736g V-4 5g Example 39 V-3 11g VI-3 100g VII-7 180g 736g V-4 5g Example 40 V- 4 16g VI-4 100g VII-7 180 g 736g Example 41 V-5 11g VI-5 100g VII-7 180g 736g V-4 5g Example 42 V-6 11g VI-6 100g VII-7 180g 736g V-4 5g Example 43 V-7 11g VI -7 100g VII-7 180g 736g V-4 5g Example 44 V-8 11g VI-8 100g VII-7 180g 736g V-4 5g Example 45 V-9 11g VI-9 100g VII-7 180g 736g V- 45g Example 46 V-1 11g VI-1 100g VII-5 130g 541g V-9 10g Example 47 V-2 11g VI-2 100g VII-5 130g 541g V-9 10g Example 48 V-3 11g VI -3 100g VII-5 130g 541g V-9 10g Example 49 V-4 11g VI-4 100g VII-5 130g 541g V-9 10g Example 50 V-5 11g VI-5 100g VII-5 130g 541g V- 9 10g Example 51 V-6 11g VI-6 100g VII-5 130g 541g V-9 10g Example 52 V-7 11g VI-7 100g VII-5 130g 541g V-9 10g Example 53 V-8 11g VI -8 100g VII-5 130g 541g V-9 10g Example 54 V-9 21g VI-9 100g VII-5 130g 541g Comparative Example 1 V-1 0g VI-1 100g VII-1 150g 600g Comparative Example 2 V-2 0g VI-2 100g VII-2 150g 600g Comparative Example 3 V-1 20g VI-1 0g VII-1 230g 600g Comparative Example 4 V-2 20g VI-2 0g VII-2 230g 600g Comparative Example 5 V-1 20g VI -1 230g VII-1 0g 600g Comparative Example 6 V-2 20g VI -2 230g VII-20 g 600g [Characteristics] The coating composition obtained in each of the above examples was applied to the surface of Al material 1
The coating was applied to a thickness of μm, dried, and then subjected to a drawless press process to produce fins, which were incorporated into a heat exchanger without cleaning.

The fin surface thus obtained was examined for water wettability (hydrophilic contact angle), coating adhesion, lubricity and press workability during fin preparation. The results are shown in Table 7. Show. Table-7 Hydrophilic contact angle Coating film adhesion Lubrication Press workability AB Example 1 ○ ○ ○ ○ ○ Example 2 ○ ○ ○ ○ ○ Example 3 ○ ○ ○ ○ ○ Example 4 ○ ○ ○ ○ ○ Example 5 ○ ○ ○ ○ ○ Example 6 ○ ○ ○ ○ ○ Example 7 ○ ○ ○ ○ ○ Example 8 ○ ○ ○ ○ ○ Example 9 ○ ○ ○ ○ ○ Example 10 ○ ○ ○ ○ ○ Example 11 ○ ○ ○ ○ ○ Example 12 ○ ○ ○ ○ ○ Example 13 ○ ○ ○ ○ ○ Example 14 ○ ○ ○ ○ ○ Example 15 ○ ○ ○ ○ ○ Example 16 ○ ○ ○ ○ ○ Example 17 ○ ○ ○ ○ ○ Example 18 ○ ○ ○ ○ ○ Example 19 ○ ○ ○ ○ ○ Example 20 ○ ○ ○ ○ ○ Example 21 ○ ○ ○ ○ ○ Example 22 ○ ○ ○ ○ ○ ○ Example 23 ○ ○ ○ ○ ○ Example 24 ○ ○ ○ ○ ○ Example 25 ○ ○ ○ ○ ○ Example 26 ○ ○ ○ ○ ○ Example 27 ○ ○ ○ ○ ○ Example 28 ○ ○ ○ ○ ○ Example 29 ○ ○ ○ ○ Example 30 ○ ○ ○ ○ ○ Example 31 ○ ○ ○ ○ ○ Example 32 ○ ○ ○ ○ ○ Example 33 ○ ○ ○ ○ ○ Example 34 ○ ○ ○ ○ ○ Example 35 ○ ○ ○ ○ ○ Example 36 ○ ○ ○ ○ ○ Example 37 ○ ○ ○ ○ ○ Example 38 ○ ○ ○ ○ ○ Example 39 ○ ○ ○ ○ ○ Example 40 ○ ○ ○ ○ ○ Example 41 ○ ○ ○ ○ ○ Example 42 ○ ○ ○ ○ ○ Example 43 ○ ○ ○ ○ ○ Example 44 ○ ○ ○ ○ ○ Example 45 ○ ○ ○ ○ ○ Example 46 ○ ○ ○ ○ ○ Example 47 ○ ○ ○ ○ ○ Example 48 ○ ○ ○ ○ ○ Example 49 ○ ○ ○ ○ ○ Example 50 ○ ○ ○ ○ ○ Example 51 ○ ○ ○ ○ ○ Example 52 ○ ○ ○ ○ ○ Example 53 ○ ○ ○ ○ ○ Example 54 ○ ○ ○ ○ ○ Comparative example 1 ○ ○ ○ × × Comparative example 2 ○ ○ ○ × × Comparative example 3 × × × ○ ○ Comparative example 4 × × × ○ ○ Comparative example 5 × ○ × ○ ○ Comparative example 6 × ○ × ○ Hydrophilic contact angle A: After immersing the sample in water for 240 hours, measure the contact angle of water droplets ○ mark; less than 30 ° △ mark; 30 ° or more × mark; peeling of coating film Hydrophilic contact angle B: sample After dipping in volatile press oil for 60 seconds, heat treatment at 150 ° C for 3 minutes, and then measuring the contact angle of water droplets ○ mark; less than 30 ° × mark; 30 ° or more Coating adhesion: volatile press oil on the sample After application, after degreasing with trichlene, judged by JIS H4001 cross-cut test ○ mark; no peeling at all × mark; peeling Lubricity: With a Bowden friction tester without applying volatile press oil to the sample Measure the dynamic friction coefficient of the surface ○ mark; less than 0.1 x mark; 0.1 or more Press workability: observe good or bad of molded product and seizure on mold ○ mark; molding defect 5% or less, to mold No seizure △ mark: 5 to 15% of defective molding, a little baking to the mold × mark: No molding More than 15%, the baking of the mold multi

[0085]

[Effect] The coating film according to the present invention has high wettability,
Therefore, when the fins are provided on the surface of the fins, the water drops spread even if they adhere, the increase in ventilation resistance is small, and the heat exchange rate is excellent. Also, since it has excellent lubricity, even if a coating film is formed in advance and then press working is performed, the mold is less likely to be damaged, and thus the manufacturing cost is reduced accordingly. .

Further, it is excellent in lubricity, which means that the amount of lubricating oil used in press working can be reduced by that much, and when the amount of lubricating oil used is reduced, the lubricating oil can be removed in the subsequent process. Not only it becomes simpler, but also deterioration of water wettability can be prevented. In addition, since the coating film has good adhesion and is hard to peel off, it is also highly water-durable and has excellent fin corrosion resistance.

Front page continuation (72) Inventor Chihiro Masago 5-1-1-48-203 Suzaku, Nara, Nara Prefecture (72) Inventor Rieko Kawahara 2045-1, Hagiwara, Haibara-cho, Uda-gun, Nara

Claims (6)

[Claims] 1. Karabin having a melting point of 50 ° C. or higher
Reactive lubrication agent composed of an ester acid composed of a nonionic polymer activator having a cloud number of 15.5 or more by an os method and a polybasic oxygen acid, and an organic basic compound And a hydrophilic resin and a water-soluble epoxy compound are contained in the fin coating composition. 2. The nonionic polymer activator is polyoxyethylene alkyl ether, polyoxyethylene alkyl phenyl ether, polyoxyethylene alkyl fatty acid amide, polyoxyethylene hydrogenated castor oil ether,
Of polyoxyethylene 12-hydroxystearate, polyoxyethylene alkyl fatty acid ester, polyoxyethylene glycerin alkyl fatty acid mono or diester, polyoxyethylene trimethylolpropane alkyl fatty acid mono or diester, polyoxyethylene pentaerythritol alkyl fatty acid mono or diester A nonionic polymer activator selected from the group which has a cloud number of 15.5 or more according to the Karabinos method by the addition of ethylene oxide and a melting point of 50 ° C. or more. Fin coating composition. 3. The hydrophilic resin is a conjugated monomer having a nitrile group, a conjugated monomer having a hydroxy group and / or a non-conjugated monomer, a conjugated monomer having a carboxyl group, carbon. Using a conjugated monomer having a saturated and / or alicyclic alkyl group of the formulas 1 to 6, a phosphate compound, and optionally a conjugated and / or non-conjugated monomer having a sulfonic acid group The fin coating composition according to claim 1, wherein the copolymer thus constituted is neutralized with an organic basic compound and an alkali metal hydroxide. 4. The ratio of the reactive lubrication agent, the hydrophilic resin and the water-soluble epoxy compound is such that hydrophilic resin: reactive lubrication agent: water-soluble epoxy compound = 100: 5 to 30:78.
To 200 (weight ratio in terms of solid content), the fin coating composition according to claim 1. 5. A fin, characterized in that the fin coating composition according to any one of claims 1 to 4 is applied to the surface of an Al material. 6. A method for producing a fin, which comprises applying the fin coating composition according to any one of claims 1 to 4 to the surface of an Al material and pressing the fin composition into a predetermined shape.