JP2649297B2 - Paint composition, painted fin material, and method for producing fin material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating composition, a painted fin material, and a method for producing a fin material.

[0002]

BACKGROUND OF THE INVENTION Recently, room air conditioners have rapidly spread with the improvement of life, and the demand for fin materials for heat exchangers has been remarkably high. As the fin material, aluminum or aluminum alloy (hereinafter simply referred to as aluminum alloy) which is lightweight and has excellent workability and thermal conductivity is widely used. For the purpose of improving heat exchange efficiency, In order to improve the water wettability of the aluminum alloy, a chemical conversion treatment such as a boehmite treatment or a coating treatment is performed on the surface of the aluminum alloy. In other words, in order to prevent not only corrosion prevention of the aluminum alloy as the fin material but also increase of ventilation resistance due to adhesion of condensed water generated during operation of the heat exchanger, and not to lower heat exchange efficiency, boehmite treatment or The hydrophilic treatment is applied by the coating treatment.

[0003] As described in Japanese Patent Publication No. 62-61078, aluminum alloy materials are generally processed after being processed into fin materials and then subjected to coating treatment. Due to problems such as uniformity of the coating film, there is an increasing expectation for a pre-coating method in which the surface of an aluminum alloy coil before the fin material processing is coated and then formed into a fin material.

As a method of coating an aluminum alloy coil by the precoating method, there is a method of coating water glass as disclosed in Japanese Patent Application Laid-Open No. Sho 58-126989 and Japanese Patent Publication No. 55-1347. However, in these proposed technologies, the water glass gradually dissolves in the condensed water, and there is a problem with the persistence of hydrophilicity. In addition, the water glass on the surface adsorbs the odor component in the environment, and the odor is reduced at the beginning of the cooling operation. There is also a problem that odors are generated by removing the components. Further, when a hard water glass film is continuously molded for a long time, there is a problem that a molding die is significantly worn.

Further, Japanese Patent Publication No. Sho 62-61078,
JP-A-59-229197, JP-A-61-225
Japanese Patent No. 044 and the like have proposed a method in which water glass, silica, aluminum hydroxide, calcium carbonate, titania, and the like are mixed with an organic resin, and in some cases, a coating is applied using a surfactant in combination. Also, JP-A-59-17
A method of applying a coating composed of an organic-inorganic (silica) composite and a surfactant as disclosed in Japanese Patent No. 0170 is also proposed. However, in these proposals, since the inorganic fine particles are present in the coating film or on the coating film surface, the die used for press molding is significantly worn, and the problem of poor fin material molding and coating film damage is caused. There is. There is also a problem with the stability of the coating film.

In recent years, the spacing between the fin materials has been reduced in order to further reduce the size and weight of the heat exchanger.
For this reason, further hydrophilicity is required, but the inorganic fine particles do not have the required hydrophilicity. In addition, the press working method has also been changed from the draw working method (extension, drawing) to the drawless working method (ironing work). Painting technology is not enough.

Further, as disclosed in JP-A-62-129366 and JP-A-63-372, there has been proposed a method of applying a coating material in which an organic resin, organic fine particles or water-absorbing organic fine particles, and a surfactant are mixed. ing. However, these techniques have few problems at the time of press molding, but have a problem that the persistence of hydrophilicity is insufficient.

Further, in the press working, it is common to apply a working oil after forming a coating film, to work into a predetermined shape by a press working or the like, and finally to perform a degreasing cleaning with trichloroethylene or the like to remove the working oil. It is. However, recently, the use of trichlorethylene and chlorofluorocarbon has been regulated from the viewpoint of destruction of the ozone layer and destruction of the global environment such as water pollution. For this reason, processing oils that do not require degreasing and cleaning (cleaning-less type processing oils) have been used in press working. This washing-less type processing oil is volatile and is degreased using a hot-air drying step instead of the conventional washing step. Since degreasing by hot air drying is inferior in degreasing ability to that of an organic solvent, particularly in a member requiring surface hydrophilicity, the hydrophilicity of the coating film is reduced in order to suppress the adverse effect of residual processing oil. Need to be more advanced. In addition, the washing-less type processing oil needs to be volatilized by hot-air drying, and it is necessary to make the molecular weight of the oil smaller than that of the conventional oil, and therefore, the viscosity is very low. For this reason, when draw-less processing is performed by applying a low-viscosity washing-less type processing oil on the coating film, there is a problem that the oil runs out and hinders press molding.

As described above, although many techniques relating to the fin material of the heat exchanger have been proposed, the fin material has a long lasting hydrophilic property.
The press workability, the odor at the beginning of the cooling operation, and the overall characteristics such as the stability of the coating film were insufficient.

[0010]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a fin material which is excellent in sustainability of hydrophilicity, press workability, odor at the beginning of cooling operation, and stability of a coating film. An object of the present invention is to provide 100 parts by weight of a water-soluble or water-dispersible organic resin other than the water-soluble amino resin, 5 to 50 parts by weight of the water-soluble amino resin, a silanol group, and a particle size of 50 m.
Water-dispersible colloidal silica of μ-2μm or water-dispersible
Silica fine particles composed of functional powdered fumed silica
150 parts by weight and a surfactant 20 having an HLB value of 8 to 18
Arumini characterized by containing 150 parts by weight
This is achieved by a fin material coating composition made of aluminum or an aluminum alloy .

Also, 100 parts by weight of a water-soluble or water-dispersible organic resin other than the water-soluble amino resin, 5 to 50 parts by weight of the water-soluble amino resin, a silanol group and a particle size of 50
Water-dispersed agglomerated colloidal silica or water-dispersed dispersion
Silica fine particles 5 made of powdered fumed silica
Surfactant 2 having an HLB value of 8 to 18 and 150 parts by weight
Coating composition containing 0 to 150 parts by weight,
This is achieved by a coated fin material which is applied to the surface of a fin material made of aluminum or an aluminum alloy so as to have a thickness of 5 μm.

Also, 100 parts by weight of a water-soluble or water-dispersible organic resin other than the water-soluble amino resin, 5 to 50 parts by weight of the water-soluble amino resin, a silanol group and a particle size of 50
Water-dispersed agglomerated colloidal silica or water-dispersed dispersion
Silica fine particles 5 made of powdered fumed silica
Surfactant 2 having an HLB value of 8 to 18 and 150 parts by weight
0 to 150 parts by weight of a coating composition containing 0.1 to 5 μm on the surface of aluminum or aluminum alloy material.
This is achieved by a method for producing a fin material, characterized in that a fin material is produced by applying a press process to the painted aluminum or aluminum alloy material after the application so that the fin material is applied.

In the present invention, examples of the water-soluble or water-dispersible organic resin include acrylic, epoxy, and the like.
Examples include alkyd-based, polyester-based, acrylic alkyd-based, and polyvinyl alcohol-based resins, and two or more types of resins may be used in combination. Examples of the water-soluble amino resin include a water-soluble melamine resin such as a derivative of a methylated melamine resin and a resin such as a benzoguanamine resin, and two or more kinds of resins may be used in combination. By using such a water-soluble amino resin in combination and performing a crosslinking reaction, the strength of the coating film is greatly improved, and damage such as peeling of the coating film during press working is improved. Furthermore, the bleeding of the surfactant in the coating film was controlled, and the sustainability of the hydrophilicity of the coating film was improved. Here, the amount of the water-soluble amino resin is 5 to 5 parts per 100 parts by weight of the water-soluble or water-dispersible organic resin other than the water-soluble amino resin.
If the amount is less than 5 parts by weight, the effect of improving alkali resistance and coating film strength tends to be small when the amount is less than 5 parts by weight. The amino resin will remain in the coating film, and the effect of improving alkali resistance and coating film strength tends to decrease, and the stability of the coating material decreases, leading to a decrease in productivity. This is because the.

Incidentally, specific examples of the water-soluble amino resin include:
Sumimar MC-1, Sumimar M-50W, Sumimar M-40W, Sumimar M-30W, Sumimar M-
504C, Sumimar M-66B (all manufactured by Sumitomo Chemical Co., Ltd.), Cymel 303, Cymel 325, Cymel 350, and Cymel 375 (Mitsui Sinamide).

It has a silanol group and has a particle size (the particle size is an average particle size measured by a Coulter Co., Ltd.) of 50 μm to 2 μm (preferably 100 μm).
The silica fine particles (μ-1.5 μm) are used to roughen the coating film by being mixed with the coating film, and since the silanol groups present on the silica surface form hydrogen bonds with water, the hydrophilicity of the coating film is high. Will be higher. Moreover, since the silica fine particles other than the silica fine particles exposed in the surface layer, that is, the silica fine particles in the inner layer are covered with the organic resin component, the odor adsorption amount is reduced.

Typical examples of such silica fine particles include water-dispersed aggregated colloidal silica and water-dispersible powdered fumed silica. Examples of the water-dispersed aggregated colloidal silica include PT-3020 (manufactured by Nissan Chemical Industries, Ltd.). As water-dispersible powdered fumed silica, for example, Aerosil 130, Aerosil 200, Aerosil 300, Aerosil 380,
Aerosil RX200, Aerosil R202, Aerosil R805, Aerosil R972, Aerosil R97
4. Aerosil R811, Aerosil R812, Aerosil OX50, Aerosil TT600, Aerosil MO
X80, Aerosil MOX170, Aerosil COK8
4 (all manufactured by Nippon Aerosil Co., Ltd.) and the like. These can be used as one kind or a mixture of two or more kinds.

In the coating composition of the present invention, silica fine particles having a silanol group and having a particle size of 50 μm to 2 μm are
5 to 150 parts by weight (in terms of solid content) with respect to 100 parts by weight of the water-soluble or water-dispersible organic resin,
If the amount is less than 5 parts by weight, the surface of the coating film is insufficiently roughened, and the contribution to hydrophilicity is small. This is because a problem has occurred in the film formability (adhesion) and odor of the film.

The reason why the particle size of the silica fine particles having a silanol group is 50 μm to 2 μm is that if the particle size is too small, less than 50 μm, the contribution to the hydrophilicity of the coating film is small. If it is too large, a problem occurs in the film forming property (adhesion) of the coating film. still,
Although the use of inorganic fine particles such as calcium carbonate and iron hydroxide instead of silica fine particles having silanol groups was considered,
With such inorganic fine particles, the surface roughening of the coating film is insufficient, and since there is no functional group having a high affinity for water on the surface, the effect of imparting hydrophilicity is small and insufficient. .

By incorporating a surfactant having an HLB value of 8 to 18 into the coating composition, the dispersibility of the silica fine particles having a silanol group can be improved,
Since a bleeding phenomenon that moves toward the surface in the coating film occurs, lubricity is improved and press moldability is improved. Furthermore, the bleeding phenomenon creates processing oil and micelles present on the surface of the coating film during press molding, and it can be easily poured in the subsequent water washing process. Does not lower the hydrophilicity of the polymer.

Surfactants having an HLB value of 8 to 18 include alkyl allyl ethers such as polyoxyethylene nonylphenyl ether and polyoxyethylene octyl phenyl ether; polyoxyethylene alkyl ether, polyoxyethylene lauryl ether, and polyoxyethylene. Alkyl ether type such as ethylene oleyl ether, polyoxyethylene tridecyl ether, polyoxyethylene cetyl ether, polyoxyethylene stearyl ether; alkyl ester type such as polyoxyethylene laurate, polyoxyethylene oleate, polyoxyethylene stearate Alkylamine types such as polyoxyethylene laurylamine; sorbitan laurate, sorbitan palmitate, sorbitan stearate, sorbitan oleate, Rubitan fatty acid esters, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan palmitate, polyoxyethylene sorbitan stearate, etc. sorbitan derivatives such as polyoxyethylene sorbitan oleate may be mentioned as representative. In the present invention, a nonionic surfactant of alkyl allyl ether type or alkyl ether type, which is particularly excellent in emulsification dispersibility, is preferable. Of course, in the present invention, it is also possible to use a surfactant other than the nonionic surfactant in combination.

A surfactant having an HLB value of 8 to 18 is used in an amount of 2 to 100 parts by weight of a water-soluble or water-dispersible organic resin.
It is necessary to add 0 to 150 parts by weight. Incidentally, it is preferably 30 to 100 parts by weight. If the amount is less than the above range, the surfactant layer formed on the surface of the coating film is thin, the lubricity is insufficient, and the initial hydrophilicity is not sufficient. Conversely, if the amount is excessively larger than the above range, the film forming property (adhesion) of the coating film decreases, and the coating film in the processed portion is undesirably peeled off during press working.

In the present invention, in addition to the above-mentioned components, conventionally-contained components may be appropriately added as necessary. Specifically, water, organic or inorganic pigments,
Examples include dispersants, antisettling agents, leveling agents, defoamers, additives such as fungicides and antibacterial agents, and various modified resins. The coating composition of the present invention may be directly applied to an aluminum alloy material, or may be applied after the aluminum alloy material has been subjected to a base treatment for improving corrosion resistance such as degreasing, chromate treatment, zirconate treatment or titanate treatment. As such, means such as spray, roll coat, shower coat and the like can be used. Of course, it is not limited to these.

The thickness of the coating film of the coating composition is from 0.1 to 5
μm. That is, when the thickness of the coating film is too thin, less than 0.1 μm, the corrosion resistance and hydrophilicity decrease, and conversely, 5 μm
If it exceeds m, there is a tendency for damage to occur during press working. Hereinafter, the present invention will be described with reference to specific examples, but the present invention is not limited thereto.

[0024]

【Example】

Example 1 100 parts by weight of a water-soluble organic resin (Allolon 471, manufactured by Nippon Shokubai Chemical Co., Ltd., solid content: 45%) and a water-soluble amino resin (Sumimar MC-1, manufactured by Sumitomo Chemical Co., Ltd., solid content) 80%) 7 parts by weight of silica fine particles (PT-302) having a silanol group and a particle size of 0.2 μm.
0, manufactured by Nissan Chemical Industries, water-dispersed agglomerated colloidal silica, solid content: 20%) 60 parts by weight, and an HLB value of 12.
Coating composition comprising 30 parts by weight of surfactant No. 3 (Newcol 564, manufactured by Nippon Emulsifier Co., 100% solids, nonionic (alkyl allyl ether type)) and water in an amount of 20% solids To aluminum alloy (JIS A
1100) Roll coating on the surface of the coil to a thickness of 2 μm and baking at 200 ° C. for 30 seconds, and then a washing-less type processing oil (Daphne punch oil A
F-2A, manufactured by Idemitsu Kosan Co., Ltd.), a fin for a heat exchanger was produced by a drawless processing method, and this fin was incorporated in the heat exchanger.

Example 2 Water-soluble organic resin (Allolon 471, manufactured by Nippon Shokubai Chemical Co., Ltd., solid content: 45%) 100
Parts by weight and a water-soluble amino resin (Sumimar MC-1,
20 parts by weight (manufactured by Sumitomo Chemical Co., Ltd., solid content: 80%) and silica fine particles having a silanol group and a particle size of 0.2 μm (P
T-3020, manufactured by Nissan Chemical Industries, water-dispersed colloidal silica, solid content 20%), 120 parts by weight, and HL
A surfactant having a B value of 13.1 (Newcol 1100,
A coating composition comprising 40 parts by weight of a solid content of 100%, nonionic (alkyl ether type) manufactured by Nippon Emulsifier Co., Ltd. and water having an amount of a solid content of 20% was prepared using an aluminum alloy (JI
S A1100) Roll-coated on the surface of the coil to a thickness of 2 μm, baked at 200 ° C. for 30 seconds, and then drawless using a washing-less type processing oil (Daphne punch oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.) A fin for a heat exchanger was produced by a processing method, and this was incorporated into the heat exchanger.

Example 3 Water-soluble organic resin (Allolon 471, manufactured by Nippon Shokubai Chemical Co., Ltd., solid content: 45%) 100
Parts by weight and a water-soluble amino resin (Sumimar MC-1,
10 parts by weight of Sumitomo Chemical Co., Ltd., solid content 80%), 10 parts by weight of silica fine particles having a silanol group and having a particle diameter of 0.3 μm (Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.)
A surfactant having an HLB value of 12.3 (Newcol 56
4. An aluminum alloy (JIS A1100) coil made of a coating composition comprising 100 parts by weight of a solid content, 100% by weight of nonionic (alkyl allyl ether type) manufactured by Japan Emulsifier Co., Ltd., and water having an amount of a solid content of 20%. Roll-coated to a thickness of 2 μm on the surface of
After baking for 2 seconds, fins for a heat exchanger are manufactured by a drawless processing method using a cleaning-less type processing oil (Daphne punch oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.)
This was incorporated into a heat exchanger.

Example 4 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Chemical Co., Ltd., solid content 55%) and a water-soluble amino resin (Sumimar MC-1, manufactured by Sumitomo Chemical Co., Ltd.) 45 parts by weight of solid content: 80 parts by weight of silica fine particles having a silanol group and having a particle diameter of 0.3 μm (Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.); and HLB
A surfactant having a value of 12.3 (Newcol 564, manufactured by Nippon Emulsifier Co., Ltd., solid content 100%, nonionic (alkyl acryl ether type)) 40 parts by weight and water having a solid content of 20% Roll coating on the surface of an aluminum alloy (JIS A1100) coil to a thickness of 2 μm and baking at 200 ° C. for 30 seconds, followed by a washing-less type processing oil (Dafney punch oil AF-2A, Idemitsu) A fin for a heat exchanger was manufactured by a drawless processing method using Kosan Co., Ltd.), and this fin was incorporated in the heat exchanger.

Example 5 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Chemical Co., Ltd., solid content 55%) and a water-soluble amino resin (Cymel 303, manufactured by Mitsui Sinamide Co., solid content 100) %), 20 parts by weight of silica fine particles having a silanol group and having a particle size of 0.3 μm (Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.), and a surfactant having an HLB value of 13.1 (Newcol 1100, A coating composition comprising 60 parts by weight of a solid content of 100%, nonionic (alkyl ether type) manufactured by Nippon Emulsifier Co., Ltd., and water having an amount of a solid content of 20% was prepared using an aluminum alloy (JIS).
A1100) The surface of the coil is roll-coated to a thickness of 2 μm and baked at 200 ° C. for 30 seconds.
Thereafter, fins for a heat exchanger were prepared by a drawless processing method using a cleaning-less type processing oil (Daphne Punch Oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.) and incorporated into the heat exchanger.

Example 6 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Kagaku Kogyo Co., Ltd., solid content 55%) and a water-soluble amino resin (Cymer 303, manufactured by Mitsui Sinamide Co., solid content 100) %) And silica fine particles (PT-3) having a silanol group and a particle size of 0.2 μm.
020, manufactured by Nissan Chemical Industries, water-dispersed agglomerated colloidal silica, solid content 20%), 40 parts by weight, and an HLB value of 1
A coating composition comprising 60 parts by weight of a 3.1 surfactant (Newcol 1100, manufactured by Nippon Emulsifier Co., Ltd., solid content 100%, nonionic (alkyl ether type)) and water having an amount of solid content of 20% Aluminum alloy (JIS A1)
100) The surface of the coil is roll-coated to a thickness of 2 μm and baked at 200 ° C. for 30 seconds, after which a washing-less type processing oil (Dafney punch oil AF)
-2A, manufactured by Idemitsu Kosan Co., Ltd.), a fin for a heat exchanger was produced by a drawless processing method, and this was incorporated into the heat exchanger.

Comparative Example 1 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Kagaku Kogyo KK, solid content 55%) and a water-soluble amino resin (Sumimar MC-1, manufactured by Sumitomo Chemical Co., Ltd.) 60 parts by weight of solid content 80%, 80 parts by weight of silica fine particles having a silanol group and having a particle diameter of 20 μm (Snowtex C, manufactured by Nissan Chemical Industries, Ltd., water-dispersed colloidal silica, solid content 20%), and HLB Value is 13.
A coating composition comprising 60 parts by weight of one surfactant (Newcol 1100, manufactured by Nippon Emulsifier Co., 100% solids, nonionic (alkyl ether type)) and water having an amount of solids of 20%. Aluminum alloy (JIS A11
00) The surface of the coil is roll-coated to a thickness of 2 μm and baked at 200 ° C. for 30 seconds, after which a washing-less type processing oil (Dafney punch oil AF-
2A, manufactured by Idemitsu Kosan Co., Ltd.), a fin for a heat exchanger was produced by a drawless processing method, and this was incorporated into the heat exchanger.

[Comparative Example 2] 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Chemical Co., Ltd., solid content 55%) and a water-soluble amino resin (Sumimar MC-1, manufactured by Sumitomo Chemical Co., Ltd.) 3 parts by weight of solid content, 80 parts by weight of silica fine particles having a silanol group and having a particle size of 4 μm,
A surfactant having an LB value of 13.1 (Newcol 110)
0, a coating composition consisting of 60 parts by weight of solid content 100%, nonionic (alkyl ether type) manufactured by Nippon Emulsifier Co., Ltd. and water having an amount of solid content of 20% was coated on the surface of an aluminum alloy (JISA1100) coil. Roll-coated to a thickness of 4 μm and baked at 200 ° C. for 30 seconds, and then for a heat exchanger by a drawless processing method using a cleaning-less type processing oil (Daphne punch oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.). Was prepared and incorporated into a heat exchanger.

Comparative Example 3 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Kagaku Kogyo KK, solid content 55%) and a water-soluble amino resin (Cymel 303, manufactured by Mitsui Sinamide Co., solid content 100) %) 20 parts by weight, 80 parts by weight of silica fine particles having a silanol group and having a particle size of 20 μm (Snowtex C, manufactured by Nissan Chemical Industries, Ltd., water-dispersed colloidal silica, solid content 20%), and a solid content of 20 % Of water and roll-coated on the surface of an aluminum alloy (JIS A1100) coil so as to have a thickness of 2 μm, and baked at 200 ° C. for 30 seconds. A fin for a heat exchanger was manufactured by a drawless processing method using Daphne Punch Oil AF-2A (manufactured by Idemitsu Kosan Co., Ltd.) and incorporated into the heat exchanger.

Comparative Example 4 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Kagaku Kogyo KK, solid content 55%) and a water-soluble amino resin (Cymel 303, manufactured by Mitsui Sinamide Co., solid content 100) %) 45 parts by weight, 80 parts by weight of silica fine particles having a silanol group and having a particle size of 20 μm (Snowtex C, manufactured by Nissan Chemical Industries, Ltd., water-dispersed colloidal silica, solid content 20%), and cationic surfactant Agent (Technol IL, manufactured by Nippon Emulsifier, solid content 100
%) Of a coating composition comprising 300 parts by weight of water and an amount of water having a solid content of 20%.
00) The surface of the coil is roll-coated to a thickness of 2 μm and baked at 200 ° C. for 30 seconds, after which a washing-less type processing oil (Dafney punch oil AF-
2A, manufactured by Idemitsu Kosan Co., Ltd.), a fin for a heat exchanger was produced by a drawless processing method, and this was incorporated into the heat exchanger.

[Comparative Example 5] 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Kagaku Kogyo Co., Ltd., solid content 55%), silica fine particles having a silanol group and having a particle size of 0.2 μm (PT- 3020, 80 parts by weight of water-dispersible agglomerated colloidal silica, manufactured by Nissan Chemical Industries, solid content 20%), 300 parts by weight of a cationic surfactant (Technol IL, manufactured by Nippon Emulsifier Co., solid content 100%), and 2 minutes
A coating composition comprising 0% water is roll-coated on the surface of an aluminum alloy (JIS A1100) coil so as to have a thickness of 2 μm, and baked at 200 ° C. for 30 seconds. A fin for a heat exchanger was prepared by a drawless processing method using (Daphne Punch Oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.), and this fin was incorporated into the heat exchanger.

Comparative Example 6 100 parts by weight of a water-soluble organic resin (Aquatoto, manufactured by Toto Chemical Co., Ltd., solid content 55%) and a water-soluble amino resin (Sumimar MC-1, manufactured by Sumitomo Chemical Co., Ltd.) A coating composition comprising 30 parts by weight of a solid surfactant (80% solids), 300 parts by weight of a cationic surfactant (Technol IL, manufactured by Nippon Emulsifier Co., 100% solids), and water having an amount of solids of 20%. To aluminum alloy (JIS
A1100) The surface of the coil is roll-coated to a thickness of 2 μm and baked at 200 ° C. for 30 seconds.
Thereafter, fins for a heat exchanger were prepared by a drawless processing method using a cleaning-less type processing oil (Daphne Punch Oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.) and incorporated into the heat exchanger.

Comparative Example 7 Water-soluble organic resin (Allolon 471, manufactured by Nippon Shokubai Chemical Co., Ltd., solid content: 45%) 100
Silica fine particles having a weight part, a silanol group, and a particle diameter of 0.3 μm (Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.)
300 parts by weight and a cationic surfactant (Technol I
L, manufactured by Nippon Emulsifier Co., Ltd., 100% by weight of a solid content, and a coating composition comprising 100% by weight of water having a solid content of 20% and rolled on the surface of an aluminum alloy (JIS A1100) coil to a thickness of 2 μm. Coat painted, and 2
Baking at 00 ° C. for 30 seconds, and then using a cleaning-less type processing oil (Daphne punch oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.) to produce a fin for a heat exchanger by a drawless processing method, and using the fin for a heat exchanger. Incorporated.

Comparative Example 8 Water-soluble organic resin (Allolon 471, manufactured by Nippon Shokubai Chemical Co., Ltd., solid content: 45%) 100
Parts by weight, 7 parts by weight of a water-soluble amino resin (Cymel 303, manufactured by Mitsui Sinamide Co., 100% solids), and silica fine particles having a silanol group and having a particle diameter of 0.3 μm (Aerosil 200, manufactured by Nippon Aerosil Co., Ltd.) ) 300 parts by weight,
A coating composition consisting of water having an amount of solid content of 20% is roll-coated on the surface of an aluminum alloy (JIS A1100) coil so as to have a thickness of 2 μm.
Baking at 30 ° C for 30 seconds, and then a washing-less type processing oil (Daphne Punch Oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.)
A fin for a heat exchanger was produced by a drawless processing method using, and this was incorporated into the heat exchanger.

Comparative Example 9 Water-soluble organic resin (Allolon 471, manufactured by Nippon Shokubai Chemical Co., Ltd., solid content: 45%) 100
Parts by weight and a water-soluble amino resin (Sumimar MC-1,
10 parts by weight of Sumitomo Chemical Co., Ltd., solid content 80%), 150 parts by weight of calcium carbonate powder having a particle size of 0.5 μm, and H
A surfactant having an LB value of 13.1 (Newcol 110)
0, a coating composition consisting of 60 parts by weight of solid content 100%, nonionic (alkyl ether type) manufactured by Nippon Emulsifier Co., Ltd. and water having an amount of solid content of 20% was coated on the surface of an aluminum alloy (JISA1100) coil. Roll coating to a thickness of 2 μm and baking at 200 ° C. for 30 seconds, and then using a cleaning-less type processing oil (Daphne punch oil AF-2A, manufactured by Idemitsu Kosan Co., Ltd.) for a drawless processing method for a heat exchanger. Was prepared and incorporated into a heat exchanger.

Comparative Example 10 100 parts by weight of a water-soluble organic resin (Allolon 471, manufactured by Nippon Shokubai Chemical Co., Ltd., solid content: 45%) and a particle size of 0.5 μm
m calcium carbonate powder and a solid content of 20 parts by weight.
% Of water and roll-coated on the surface of an aluminum alloy (JIS A1100) coil so as to have a thickness of 2 μm, and baked at 200 ° C. for 30 seconds. Using a daphne punch oil AF-2A (manufactured by Idemitsu Kosan Co., Ltd.), a fin for a heat exchanger was produced by a drawless processing method, and this fin was incorporated into the heat exchanger. [Comparative Example 11] In Example 1, the silica fine particles were replaced with synthetic silica (Fujide).
Except that it has been replaced by a thyroid manufactured by Wison Chemical Co., Ltd.)
Do the same to make the fins and assemble them into the heat exchanger.
I was crowded.

[0040]

〔Test method〕

[Hydrophilic contact angle] Measured with Elmagoniometer GI type [Water wettability] Visually determine the state of water wetness on the coating film surface when immersed in a beaker containing tap water, pulled up, and placed horizontally did. The mark indicates that no polka dots were generated and the entire surface was wet with water, and the cross indicates that polka dots were generated and portions that were not wet were recognized.

[Hydrophilic persistence] After degreasing with vapor of trichloroethane (chlorocene SM, manufactured by Dow Chemical Company) for 5 minutes, immersion in tap water for 350 hours, drying at 80 ° C for 5 minutes, It was determined by a wettability test. [Lubricity] Using a surface property measuring device HEIDON-14 type (manufactured by Shinto Kagaku), load 200 g, ball indenter φ10
mm and a moving speed of 50 mm / min.
The mark indicates a coefficient of kinetic friction of less than 0.35, and the mark X indicates a coefficient of kinetic friction of 0.35 or more.

[Adhesion] Eleven vertical and horizontal cuts at 2 mm intervals were made with a knife until they reached the material, and 100 squares each having a side length of 2 mm were formed in a grid pattern.
When a cellophane adhesive tape was stuck and immediately peeled off, the number of squares remaining without peeling was determined. The mark is 100/10
0, x mark is 99/100 or less. [Alkali resistance] After immersion in Kuridyne F mild (manufactured by Kurita Kogyo Co., Ltd.) for 20 minutes at 20 ° C., it was dried at room temperature and determined by the above adhesion test.

[Paint Stability] The composition was allowed to stand in a constant temperature bath at 50 ° C., and the state of the paint after 2 weeks was determined. The mark “殆 ど” shows almost no change from the initial state, and the mark “X” becomes thickened or gelled. [Odor] After being immersed in a water tank in which tap water flows for 72 hours, it was left standing in a room for 24 hours to evaluate. The mark 殆 ど indicates little odor, the mark △ indicates slight odor, and the mark × indicates strong odor.

[0044]

On the other hand, when the water-soluble amino resin was not used or when the added amount was small, as shown in Comparative Examples 2, 5, 7, and 10, the features of the present invention were not exhibited at all. Also, even if the added amount of the water-soluble amino resin is too large, as shown in Comparative Example 1, the features of the present invention are not exhibited at all. It has a silanol group and has a particle size of 5
When silica fine particles of 0 μm to 2 μm were not used, as shown in Comparative Examples 1, 3, 4, 6, 9, and 10,
The features of the present invention have not been achieved at all. In addition, even when silica fine particles having a silanol group and having a particle size of 50 μm to 2 μm are used, if the amount of addition is too large, the features of the present invention are not at all exhibited.

When no surfactant having an HLB value of 8 to 18 was used, Comparative Examples 3, 4, 5, 6, 7, 8, and
As shown in FIG. 10, the features of the present invention are not exhibited at all.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location C09D 161/20 PHK C09D 161/20 PHK F28F 1/32 F28F 1/32 H (72) Inventor Ogawa Susumu, Otawara City, Tochigi Pref. 61-185570 (JP, A) JP-A-61-163972 (JP, A)

Claims (3)

(57) [Claims] 1. A water-soluble or water-dispersible organic resin other than a water-soluble amino resin (100 parts by weight), a water-soluble amino resin (5 to 50 parts by weight), a silanol group, and a particle size of 50 m
Water-dispersible colloidal silica of μ-2μm or water-dispersible
Silica fine particles composed of functional powdered fumed silica
150 parts by weight and a surfactant 20 having an HLB value of 8 to 18
Arumini characterized by containing 150 parts by weight
Coating composition for fin material made of aluminum or aluminum alloy . 2. 100 parts by weight of a water-soluble or water-dispersible organic resin other than a water-soluble amino resin, 5 to 50 parts by weight of a water-soluble amino resin, a silanol group, and a particle size of 50 m
Water-dispersible colloidal silica of μ-2μm or water-dispersible
Silica fine particles composed of functional powdered fumed silica
150 parts by weight and a surfactant 20 having an HLB value of 8 to 18
From 0.1 to 5 parts by weight of the coating composition.
A painted fin material which is applied to a surface of a fin material made of aluminum or an aluminum alloy so as to have a thickness of μm. 3. A water-soluble or water-dispersible organic resin other than the water-soluble amino resin (100 parts by weight), a water-soluble amino resin (5 to 50 parts by weight), a silanol group and a particle size of 50 m
Water-dispersible colloidal silica of μ-2μm or water-dispersible
Silica fine particles composed of functional powdered fumed silica
150 parts by weight and a surfactant 20 having an HLB value of 8 to 18
To 150 parts by weight of a coating composition having a thickness of 0.1 to 5 μm on the surface of aluminum or an aluminum alloy material.
A method for producing a fin material, wherein the fin material is produced by applying a coating so as to form a coated aluminum or aluminum alloy material.