JP3430482B2 - Heat exchange material - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a heat exchange material such as fins.

[0002]

Room air conditioners have rapidly spread with the improvement of living standards, and the demand for fins for heat exchangers is extremely high. As the fin, 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 for the purpose of improving heat exchange efficiency, that is, for improving the water wettability of the fins,
Chemical conversion treatment such as boehmite or coating treatment is performed on the surface of Al material. In other words, not only to prevent corrosion of the Al material that is a fin material, but also to prevent an increase in ventilation resistance due to the attachment of condensed water that occurs during operation of the heat exchanger, and to prevent a decrease in heat exchange efficiency. Therefore, chemical conversion treatment such as boehmite treatment or coating treatment is performed.

By the way, after processing the Al material into the shape of the fin, it is common to carry out a surface treatment such as a coating treatment, but recently, in view of simplification of the process and uniformity of the coating film. Expectations are increasing for a precoating method in which a hydrophilic coating is applied to the surface of a coil made of an Al material before being processed into fins to provide a hydrophilic coating film, and then the fins are processed into a shape.

However, it has been found that if the coating is simply formed by applying a hydrophilic coating, the fins will be corroded in about several months if they are exposed to a strong corrosive environment. Came. Therefore, an attempt was made to provide a coating film having excellent corrosion resistance. That is, various paints were applied, a hydrophilic paint was applied on the undercoat film, and then the fins were processed.

However, the resin in the undercoat film is
For example, in the case of polyethylene resin, fluororesin, vinyl chloride resin, etc., the hydrophilic paint applied on top of the resin is repelled and the hydrophilic coating film is not formed well, so condensed water generated during operation of the heat exchanger Could not be effectively achieved. Further, when the resin in the undercoat coating film was, for example, a polyurethane resin, the corrosion resistance and water wettability were poor.

Further, when the resin in the undercoat coating film is, for example, a polyester resin, the wettability is poor. Further, when the resin in the undercoat coating film was, for example, a phenol resin or a melamine resin, the workability, corrosion resistance and water wettability were poor. Further, when the resin in the undercoat coating film was an acrylic resin, the corrosion resistance and water wettability were poor.

When the resin in the undercoat coating film is an epoxy resin, the weather resistance and water wettability are poor. Therefore, the problem to be solved by the present invention is to provide a heat exchanger having excellent corrosion resistance and weather resistance, and also having excellent water wettability (heat exchange efficiency). Furthermore, the house
Contained in various pollutants emitted from, for example, interior building materials
DOP (dioctyl phthalate) and stearic acid,
The higher fatty acids contained in the floor polish are photolyzed
Even if the low molecular weight substance volatilizes and adheres to the fin, this
Highly resistant heat that easily removes pollutants from
It is to provide an exchanger. Also, heat with excellent odor
It is to provide an exchanger.

[0008]

Means for Solving the Problems The above-mentioned problems are solved by the following: aluminum or aluminum alloy material, a first layer provided on the aluminum or aluminum alloy material and containing acrylic resin and epoxy resin, and And a hydrophilic second layer provided on the first layer.
Ri, acrylic resin in the first layer and the epoxy
The ratio with acrylic resin (acrylic resin / epoxy resin)
The second layer , which has a weight ratio of 50/50 to 5/95.
Is an acrylic resin whose particles derived from alumina sol are water-soluble.
Covered with oil and polyethylene glycol on the outside
And its modified products, ethylene oxide and propylene oxide
Selected from the group of copolymers with side and modified products thereof.
Has a structure in which at least one compound is present
It is solved by a heat exchange material characterized by being a thing.

Further, it contains aluminum or an aluminum alloy material, a phosphoric acid chromate film provided on the aluminum or aluminum alloy material, and an acrylic resin and an epoxy resin provided on the phosphoric acid chromate film. a first layer, it comprises a second layer having hydrophilic that provided on the first layer, the first
Ratio of acrylic resin and epoxy resin in the layer
The weight ratio of (acrylic resin / epoxy resin) is 50 /
50 to 5/95, and the second layer is alumina sol.
Particles derived from are covered with water-soluble acrylic resin
Polyethylene glycol and its modification on the outside
Of ethylene oxide and propylene oxide
At least one selected from the group of polymers and their modified products
Is also solved by a heat exchange material characterized by having a structure in which one kind of compound exists .

That is, when the first layer (coating film containing acrylic resin and epoxy resin) is provided under the second layer (hydrophilic coating film), the acrylic resin and epoxy resin are provided. The coating film containing not only exhibited excellent characteristics in corrosion resistance and weather resistance, but also did not repel the hydrophilic coating material applied thereon, so that the hydrophilic coating film was formed neatly. In particular, the ratio of acrylic resin and epoxy resin contained in the first layer (acrylic resin / epoxy resin)
In a weight ratio of 50/50 to 5/95 (particularly 30/70
In the case of 10/90), the corrosion resistance and weather resistance were further excellent, and the hydrophilic coating film was formed neatly.

The thickness of the first layer is 0.1 to 5 μm.
It is preferably m (particularly 0.5 to 3 μm). This is because if the thickness is too thin, less than 0.1 μm, the effect of improving corrosion resistance and weather resistance is weak. On the other hand, even if the thickness exceeds 5 μm, there is no problem in corrosion resistance and weather resistance, but if it becomes too thick, the workability at the time of press working on the fins tends to decrease, and it is economical. Is inferior.

Further, it is preferable that the first layer does not contain a surfactant and a silicon-based additive. That is, when the surfactant and the silicon-based additive were not included, the hydrophilic coating film was formed more neatly. The first layer can be formed by applying a coating material containing an acrylic resin and an epoxy resin.

In the present invention, the acrylic resin includes methacrylic resin. The second layer has a surface roughness (center line average roughness Ra) of 0.1 to 1 μm (preferably 0.1 to 0.7 μm, more preferably 0.2 to 0.5).
μm) is preferred. That is, by having such a surface roughness, water wettability is further improved.

The thickness of the second layer is 0.01-5.
It is preferable that the thickness is μm (particularly 0.2-2 μm). That is, when the thickness is too thin, less than 0.01 μm, it is difficult to maintain good water wettability for a long period of time. On the other hand, if the thickness exceeds 5 μm, there is no problem in water wettability, but if it becomes too thick, the workability at the time of press working on the fin tends to decrease, and the economical efficiency becomes poor. .

The second layer is composed of inorganic particles (in alumina sol).
Derived particles) and hydrophilic resin ( water-soluble acrylic resin )
It can be configured to include fat ). In particular, alumina sol
Particles derived from are covered with water-soluble acrylic resin
Polyethylene glycol and its modification on the outside
Of ethylene oxide and propylene oxide
At least one selected from the group of polymers and their modified products
Also has a structure in which one kind of compound exists.

The above-mentioned inorganic particles are, for example, feather-like, needle-like,
It has a non-spherical shape such as a rod shape or a dendritic shape, and its average particle size is 0.01 to 20 μm (the lower limit is 0.05 μm, further 0.1 μm, particularly 0.5 μm).
Is preferred. The upper limit is 5 μm, further 4 μm, especially 2
μm is preferred. The thing of () is preferable. The content of the inorganic particles is preferably 5 to 50 wt% (particularly 10 to 30 wt%). Those inorganic particles is derived from alumina sol
Is . That is, by including the inorganic particles having the above characteristics in the second layer, the water wettability is improved.

The content of the hydrophilic resin contained in the second layer is preferably 50 to 95 wt% (particularly 70 to 90 wt%).

[0018]

1 is a schematic view of a heat exchange material according to the present invention. The heat exchange material according to the present invention is an Al material 1,
A first layer 3 containing an acrylic resin and an epoxy resin provided on the Al material 1 and a hydrophilic second layer 4 provided on the first layer 3. Or A
1 material 1, a phosphoric acid chromate film 2 provided on the Al material 1, and a first layer 3 containing an acrylic resin and an epoxy resin provided on the phosphoric acid chromate film 2.
The hydrophilic second layer 4 provided on the first layer 3.
And.

The ratio of the acrylic resin to the epoxy resin contained in the first layer 3 (acrylic resin / epoxy resin) is 50/50 to 5/95 by weight ratio, particularly 30/7.
It is 0 to 10/90. The first layer 3 has a thickness of 0.
It is 1 to 5 μm, particularly 0.5 to 3 μm. The first layer 3 does not contain a surfactant and a silicon-based additive. First
This layer is formed by applying a coating material containing an acrylic resin and an epoxy resin. In the present invention,
Methacrylic resins are also included in the acrylic resins.

The second layer 4 has a surface roughness (center line average roughness Ra) of 0.1 to 1 μm, preferably 0.1 to 0.
7 μm, particularly 0.2 to 0.5 μm. Second layer 4
Has a thickness of 0.01 to 5 μm, especially 0.2 to 2 μm.
Is. The second layer 4 is configured to include inorganic particles and a hydrophilic resin. In particular, it is configured to include at least one compound selected from the group consisting of inorganic particles, water-soluble acrylic resin, and polyethylene glycol, and modified products thereof, copolymers of ethylene oxide and propylene oxide, and modified products thereof. To be done. In particular, it is constituted by applying a paint containing the above composition.

The inorganic particles contained in the second layer 4 have a non-spherical shape such as feather-like, needle-like, rod-like, or dendritic, and have an average particle diameter of 0.01-. Two
0 μm (lower limit value is 0.05 μm, moreover 0.1 μm,
Particularly, 0.5 μm is preferable. The upper limit value is 5 μm, more preferably 4 μm, and particularly preferably 2 μm. )belongs to. The content of the inorganic particles is 5 to 50 wt%, especially 10 to 30 wt
%. The inorganic particles are derived from alumina sol.

The content of the hydrophilic resin contained in the second layer 4 is 50 to 95 wt%, particularly 70 to 90 wt%. A lubricant is provided on the second layer 4. For example, a lubricant such as a nonionic polymer activator is provided. Less than,
Further description will be made.

The phosphoric acid chromate film 2 provided on the Al material 1 has a thickness of 10 to 30 mg / m ^{2 in} terms of Cr. The phosphoric acid chromate film 2 is formed by phosphoric acid chromate treatment. The phosphoric acid chromate film may not be formed, but by forming the phosphoric acid chromate film 2, corrosion resistance and weather resistance are improved.

The epoxy resin contained in the first layer 3 is
Its molecular weight is from 1,000 to 5,000. The first layer 3 is formed by applying a coating material containing the acrylic resin (and / or methacrylic resin) and the epoxy resin. The second layer 4 formed on the first layer 3 is formed by applying a coating material containing inorganic particles and a hydrophilic resin. For example, a coating containing at least one compound selected from the group consisting of alumina sol, water-soluble acrylic resin, polyethylene glycol, and modified products thereof, copolymers of ethylene oxide and propylene oxide, and modified products thereof is applied. Is formed by In particular, at least one compound selected from the group consisting of a mixture of alumina sol and a water-soluble acrylic resin, followed by polyethylene glycol, and modified products thereof, copolymers of ethylene oxide and propylene oxide, and modified products thereof. Is added and mixed to form an aqueous coating composition. That is, by first mixing the alumina sol and the water-soluble acrylic resin, the water-soluble acrylic resin is adsorbed on the surface of the particles derived from the alumina sol, or the water-soluble acrylic resin is inside the particles derived from the alumina sol. The penetration is promoted and the adhesion of the coating film is improved. or,
By doing so, the amount of the compound such as polyethylene glycol added in the subsequent step can be increased and a coating film excellent in stain resistance can be obtained.

The alumina sol used in the present invention is an aqueous dispersion in which particles (any shape) of alumina hydrate are dispersed in water. Water-dispersed particles of hydrated alumina are anions in water, such as OH ⁻ , SO ₄ ⁻ , Cl ⁻ , NO ₄ ⁻ , CH.
2-100 nm formed by dispersing ₃ COO ^- as a stabilizer
Particles having a colloidal size of a certain degree, and particles having a colloidal size according to various methods are aggregated to have an average particle diameter (average major axis) of about 0.5 to 20 μm. The latter agglomerated particles are preferred. In particular, the agglomerated particles are not substantially spherical and have a large surface area if they have the same volume, for example, have a feather-like, needle-like, rod-like, or dendritic form.

As the above-mentioned alumina sol, Cataloid AS-1 (average particle size 0.2 μm, manufactured by Catalyst Kasei Kogyo Co., Ltd.) is used.
m), Cataloid AS-2 (average particle size 0.2 μm), Nissan Chemical Industries alumina sol 100 (average particle size 0.2 μm)
m), alumina sol 200 (average particle size 0.2 μm), alumina sol 520 (average particle size 0.02 μm), Kawaria Fine Chemical Co.'s alumina clearsol (average particle size 0.02 μm), alumina sol-10 (average particle size). 0.0
2 μm) and the like. In addition, these particles have an average particle size of 2 to
Particles of about 200 nm are dispersed in water.

As the alumina sol, the above alumina sol may be used alone. However, if the average particle size is 0.5 to 20μ
Non-spherical shape (eg, feather, needle,
It is preferable to use an alumina sol which is a dispersion of aggregated particles in a rod-like or dendritic form. Of course, both may be used together. That is, when such an alumina sol of agglomerated particles is used, roughening of the cured coating film is effectively achieved, the contact area with water is increased, and the wettability is improved by the capillary phenomenon based on the morphology. Get even better.

As an alumina sol which is a dispersion of non-spherical aggregated particles aggregated to an average particle size of about 0.5 to 20 μm, Cataloid AS-3 (average particle size 0.8 μm) manufactured by Catalysts & Chemicals Industries Co., Ltd. is there. Further, it is also possible to use powder cataloid AP-3 obtained by spray drying cataloid AS-3, which is dispersed in water. In addition, Cataloid AP-3
Has an average particle diameter of 50 to 60 μm in a dry state, but is easily redispersed in water, and the average particle diameter of the dispersed particles at the time of this redispersion is about the same as that of Cataloid AS-3.

The alumina sol of the present invention is in a stage where the dispersed particles are transferred from the amorphous gel to the boehmite, and this state is in the agglomeration process or the usual baking conditions of the coating film (for example, 250 ° C. × 20 seconds). Does not change. Dispersed particles of alumina sol at the stage of transition from this amorphous gel to boehmite are softer than colloidal silica. Therefore, the workability at the time of pressing the material having the coating film containing the particles derived from the alumina sol is good, and the durability of the mold is also high.

The hydrophilic resin used in the present invention is a water-soluble acrylic resin. In particular, an acrylic resin having a sulfonic acid group, a monovalent salt such as a sodium salt, a potassium salt, a lithium salt of a sulfonic acid group, or a polar group such as a hydroxyl group or a carboxyl group, preferably an acrylic copolymer.
Incidentally, the partner monomer of the copolymer is arbitrary, but for example, acrylamide, N-methylol acrylamide, N-
A monomer having an amino group such as methoxymethylol acrylamide is preferred.

As the water-soluble acrylic resin, an α, β unsaturated monomer A having a sulfonic acid group or a salt thereof,
An α, β unsaturated monomer B having a carboxylic acid group and an α, β unsaturated monomer C having an alcoholic hydroxyl group (ratio: A; 1 to 80 wt% (preferably 30 to 50 wt
%), B; 1-50 wt% (preferably 20-50 wt)
%), C; 1 to 50 wt% (preferably 20 to 40 wt%
%) Is desirable. A + B + C = 100 wt%) copolymerized is preferable.

Α, β having a sulfonic acid group or a salt thereof
As the unsaturated monomer A, for example, vinyl sulfonic acid, aryl sulfonic acid, 2-acrylamido-2-methyl sulfonic acid, styrene sulfonic acid, methacryloyloxyethyl sulfonic acid, or the above-mentioned sodium salt, potassium salt, lithium salt, etc. Are preferred. This monomer A is
It exhibits anionic hydrophilicity and improves the wettability of the coating film.

As the α, β unsaturated monomer B having a carboxylic acid group, for example, acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, crotonic acid and the like are preferable. This monomer B improves the wettability and adhesion of the coating film. As the α, β unsaturated monomer C having an alcoholic hydroxyl group, for example, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, N-methylol (meth) acrylamide and the like are preferable. The monomer C plays a role of improving the wettability of the coating film and fixing particles derived from the alumina sol.

At least one compound selected from the group consisting of polyethylene glycol, a modified product thereof, a copolymer of ethylene oxide and propylene oxide, and a modified product thereof can be used as a sustained release agent from a coating film and as a contaminant. From the viewpoint of detergency, those having a weight average molecular weight of 2,000 to 500,000 are preferable. The modified product is a product having a functional group other than a hydroxyl group bonded to the terminal. Examples of the functional group include those having a glycidyl group, an oxime-blocked isocyanate group, or the like. That is, having such a functional group makes it difficult to react with a water-soluble acrylic resin or react with each other to be eliminated by dew condensation water. Therefore, those having two or more functional groups are more preferable. When it has no functional group, for example, in the case of polyethylene glycol or a copolymer of ethylene oxide and propylene oxide, the melting point is 50 ° C.
It is preferable to use the above (more easily obtainable at 70 ° C. or lower). That is, if the melting point is 50 ° C. or higher, it is difficult for the condensed water to remove it. Also, it is easy to remove contaminants.

As the polyethylene glycol, PEG6000 (weight average molecular weight 600, manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.) is used.
0, melting point 50 to 53 ° C.), Paogen EP-15 (weight average molecular weight 120000 to 130000, melting point 55 ° C.),
Sanyo Kasei PEG 20,000 (weight average molecular weight 20
000, melting point 56 to 62 ° C.) and the like are commercially available. As modified products of polyethylene glycol, "Deconal" series (having a glycidyl group as a functional group) manufactured by Nagase Kasei Co., Ltd., "Elastron" series (a blocked isocyanate group as a functional group) manufactured by Daiichi Kogyo Seiyaku Co., Ltd. Have) are commercially available. As a copolymer of ethylene oxide and propylene oxide, Paogen EP-15 manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd. is commercially available.

Alumina sol is mixed with a water-soluble acrylic resin, and then at least one selected from the group consisting of polyethylene glycol, modified products thereof, copolymers of ethylene oxide and propylene oxide, and modified products thereof. In the coating film formed by applying a water-based paint obtained by adding and mixing the compound, particles derived from alumina sol are covered with a water-soluble acrylic resin, polyethylene glycol on the outside, and modified products thereof, It has a structure in which a compound (cleaning component) such as a copolymer of ethylene oxide and propylene oxide and a modified product thereof exists. Therefore, various pollutants emitted from houses, such as D contained in interior building materials
Even if OP (dioctyl phthalate), stearic acid, and higher fatty acids contained in floor polish that are photolyzed and have a low molecular weight volatilize and adhere to the fins, these contaminants cause condensed water to flow on the fin surface. As a result, they are successively washed away with the aid of the above-mentioned washing components.

In addition to the above components, the second layer 4 contains polyvinyl alcohol, methyl cellulose, carboxydimethyl cellulose, hydroxyethyl cellulose, polyacrylic acid, polymethacrylic acid, acrylic acid (or methacrylic acid). -A vinyl alcohol copolymer, a sodium polyacrylate-based, a sodium polymethacrylate-based, a sodium polyacrylate (sodium polymethacrylate) -acrylic acid (or methacrylic acid) amide copolymer and the like may be contained. Further, various additives may be included.

Then, the nonionic polymer activator (lubricant) is dissolved in a predetermined amount of water, and this aqueous coating material is applied with a suitable coating means such as brush coating, dipping, spraying, electrostatic coating or roll coater. Is applied to the surface of layer 4. After coating, for example, by maintaining the temperature at 80 to 250 ° C. for about 2 to 180 seconds and drying, the thickness is 0.01 to 5 μm.
The lubricant layer is composed.

Then, the Al having the above-mentioned layers is formed.
Predetermined processing (for example, drawless processing) is performed on the material 1 to form fins. Since the second layer 4 is provided in the fin thus obtained, the surface is rich in water wettability and the heat exchange efficiency is excellent. Also, the first layer 3
Is provided, it has excellent corrosion resistance and weather resistance. Moreover, since the first layer 3 is a layer containing an acrylic resin and an epoxy resin, the hydrophilic second layer 4 is formed neatly and exhibits good water wettability.

[0040]

【Example】

[Water-soluble acrylic resin] 220 g of deionized water is kept at 60 ° C. in a 500 cc three-neck flask and stirred. 0.4 g of ammonium persulfate was charged, and 2-acrylamido-2
-Methylpropanesulfonic acid (2AA2MPSA) 5
A mixed solution of 160 g of a 0% aqueous solution, 10 g of 2-hydroxyethyl acrylate (HEA), 10 g of acrylic acid (AA), and 20 g of a 10% aqueous solution of sodium hypophosphite is added dropwise over 1 hour. 0.4 g of ammonium persulfate (10% aqueous solution) is added every 50 minutes four times, and the temperature of the reaction system is raised to 80 ° C. during the second addition. The nonvolatile matter was confirmed and the polymerization was completed to obtain a water-soluble acrylic resin.

A water-soluble acrylic resin was obtained in the same manner as above. The contents of the water-soluble acrylic resin obtained above are shown in Table 1 below. Table-1 No. 1 water-soluble acrylic resin 2AA2MPSA / AA / HEA = 8/1 1/1 No2 water-soluble acrylic resin 2AA2MPSA / AA / HEA = 4/5/1 No3 water-soluble acrylic resin 2AA2MPSA / AA / HEA = 4 / 1/5 No4 water-soluble acrylic resin VSA-Na / AA / HEA = 4/3/3 * VSA-Na = sodium vinyl sulfonate [fin] The surface of Al coil 1 having a thickness of 100 μm is treated with phosphoric acid chromate. The thickness is 20 mg /
An m ² phosphoric acid chromate film 2 was provided.

After that, an acrylic resin (Jurimer SEK-30 manufactured by Nippon Pure Chemical Co., Ltd.) was formed on the phosphoric acid chromate film 2.
1) and epoxy resin (Epokey 802 manufactured by Mitsui Toatsu Co., Ltd.)
-30CX) is applied and dried to a thickness of 1.
A 5 μm first layer 3 was provided. Then, the alumina sol and the water-soluble acrylic resin are mixed, and then polyethylene glycol, and a modified product thereof, a copolymer of ethylene oxide and propylene oxide, and at least one selected from the modified product group A water-based paint obtained by adding and mixing a compound is applied and dried to obtain a surface roughness R
The second layer 4 having a of 0.1 to 0.7 μm and a thickness of 1 μm.
Was set up.

Thereafter, a water-based paint containing a nonionic polymer activator was applied and dried to form a layer containing the nonionic polymer activator having a thickness of 1 μm on the second layer 4. Then, the coated Al coil material was pressed to produce fins, and then the fins were incorporated into the heat exchanger without cleaning. [Example 1] In this example, in the above [fin], the ratio of acrylic resin to epoxy resin in the first layer 3 (acrylic resin / epoxy resin) was 1 by weight.
0/90, and the alumina sol is Cataloid AS
-1 (average particle size 0.2 μm, manufactured by Catalysts & Chemicals Industries Co., Ltd.), the water-soluble acrylic resin is No. 1 water-soluble acrylic resin, and the cleaning component is polyethylene glycol (PEG 6000 manufactured by Dai-ichi Kogyo Seiyaku Co., weight average molecular weight). 6000), and the ratio of the inorganic particles derived from the alumina sol in the second layer 4 to the ratio of the water-soluble acrylic resin and polyethylene glycol (inorganic particles / water-soluble acrylic resin / polyethylene glycol) is a weight ratio. In 1
It is 5/70/15.

[Embodiment 2] This embodiment is based on the above [fin].
In, the ratio of acrylic resin and epoxy resin in the first layer 3 (acrylic resin / epoxy resin)
Is 15/85 in weight ratio, and the alumina sol is Cataloid AS-2 (average particle size 0.3 μm, manufactured by Catalysts & Chemicals Industry Co., Ltd.), and the water-soluble acrylic resin is No. 1 water-soluble acrylic resin, and the cleaning component is Is polyethylene glycol (PEG 6000 manufactured by Daiichi Kogyo Seiyaku Co., Ltd., weight average molecular weight 6000), and the proportion of inorganic particles derived from the alumina sol in the second layer 4 and the water-soluble acrylic resin and polyethylene glycol The ratio (inorganic particles / water-soluble acrylic resin / polyethylene glycol) is 20/65/15 by weight.

[Embodiment 3] This embodiment is based on the above [fin].
In, the ratio of acrylic resin and epoxy resin in the first layer 3 (acrylic resin / epoxy resin)
Is 20/80 by weight, the alumina sol is alumina sol 100 (average particle size 0.2 μm, manufactured by Nissan Chemical Industries, Ltd.), the water-soluble acrylic resin is No. 2 water-soluble acrylic resin, and the cleaning component is polyethylene glycol. (Daiichi Kogyo Seiyaku Co., Ltd., Paogen EP-15, weight average molecular weight 120000 to 130000) is used, and the proportion of inorganic particles derived from alumina sol in the second layer 4, water-soluble acrylic resin and polyethylene glycol. The ratio (inorganic particles / water-soluble acrylic resin / polyethylene glycol) is 25/60/15 by weight.

[Embodiment 4] This embodiment is based on the above [fin].
In, the ratio of acrylic resin and epoxy resin in the first layer 3 (acrylic resin / epoxy resin)
Is 30/70 by weight, the alumina sol is alumina sol 200 (average particle size 0.3 μm, manufactured by Nissan Chemical Industries, Ltd.), the water-soluble acrylic resin is No. 2 water-soluble acrylic resin, and the cleaning component is polyethylene glycol. (Daiichi Kogyo Seiyaku Co., Ltd., Paogen EP-15, weight average molecular weight 120000 to 130000) is used, and the proportion of inorganic particles derived from alumina sol in the second layer 4, water-soluble acrylic resin and polyethylene glycol. The ratio (inorganic particles / water-soluble acrylic resin / polyethylene glycol) is 30/55/15 by weight.

[Embodiment 5] This embodiment is based on the above [fin].
In, the ratio of acrylic resin and epoxy resin in the first layer 3 (acrylic resin / epoxy resin)
Is 10/90 by weight, the alumina sol is alumina sol 520 (average particle size 0.02 μm, manufactured by Nissan Chemical Industries, Ltd.), the water-soluble acrylic resin is No. 3 water-soluble acrylic resin, and the cleaning component is polyethylene glycol. (PEG 20000 manufactured by Sanyo Kasei Co., weight average molecular weight 200
00), and the ratio of the inorganic particles derived from the alumina sol in the second layer 4 to the ratio of the water-soluble acrylic resin and polyethylene glycol (inorganic particles / water-soluble acrylic resin / polyethylene glycol) is a weight ratio. It is 15/75/10.

[Sixth Embodiment] This embodiment is based on the above [fin].
In, the ratio of acrylic resin and epoxy resin in the first layer 3 (acrylic resin / epoxy resin)
Is 15/85 in weight ratio, the alumina sol is alumina clearsol (average particle size 0.02 μm, manufactured by Kawaken Fine Chemicals Co., Ltd.), and the water-soluble acrylic resin is No. 3 described above.
Water-soluble acrylic resin, polyethylene glycol (PEG 20000 manufactured by Sanyo Kasei Co., Ltd., weight average molecular weight 20000) is used as the cleaning component, and
In the layer 4, the ratio of the inorganic particles derived from the alumina sol and the ratio of the water-soluble acrylic resin and polyethylene glycol (inorganic particles / water-soluble acrylic resin / polyethylene glycol) are 20/70/10 by weight.

[Embodiment 7] This embodiment is based on the above [fin].
In, the ratio of acrylic resin and epoxy resin in the first layer 3 (acrylic resin / epoxy resin)
Is 20/80 by weight, and the alumina sol is Aluminasol-10 (average particle size 0.02 μm, manufactured by Kawaken Fine Chemicals Co., Ltd.), and the water-soluble acrylic resin is No. 4 described above.
Of water-soluble acrylic resin, polyethylene glycol (PEG 6000 manufactured by Daiichi Kogyo Seiyaku Co., Ltd., weight average molecular weight 6000) was used as the cleaning component, and
The ratio of the inorganic particles derived from the alumina sol in Layer 4 and the ratio of the water-soluble acrylic resin and polyethylene glycol (inorganic particles / water-soluble acrylic resin / polyethylene glycol) are 25/65/10 by weight.

[Embodiment 8] This embodiment is based on the above [fin].
In, the ratio of acrylic resin and epoxy resin in the first layer 3 (acrylic resin / epoxy resin)
Is 30/70 in weight ratio, and the alumina sol is Cataloid AS-1 (average particle size 0.2 μm, manufactured by Catalysts & Chemicals Industries Co., Ltd.), and the water-soluble acrylic resin is No. 4 water-soluble acrylic resin. Is polyethylene glycol (Paiogen EP-15 manufactured by Dai-ichi Kogyo Seiyaku Co., weight average molecular weight 120000-130000), and the proportion of inorganic particles derived from the alumina sol in the second layer 4 and the water-soluble acrylic resin. And polyethylene glycol ratio (inorganic particles / water-soluble acrylic resin / polyethylene glycol) is 30/60/1 in weight ratio
It is 0.

Comparative Example 1 The same procedure as in Example 1 was carried out except that the first layer 3 was not provided. [Comparative Example 2] In Example 1, the first layer 3 was made of a polyurethane resin (Daiichi Kogyo Seiyaku Co., Ltd., Superflex E-
2000) except that it was configured in the same manner.

[Comparative Example 3] The same procedure as in Example 1 was carried out except that the first layer 3 was made of polyethylene resin (Rexlon W1010 manufactured by Nippon Petrochemical Co., Ltd.). [Comparative Example 4] The same procedure as in Example 1 was carried out except that the first layer 3 was made of a fluororesin (Lumiflon LF100 manufactured by Asahi Glass Co., Ltd.).

[Comparative Example 5] In Example 1, the first layer 3 was made of melamine resin (Cymel 7 manufactured by Mitsui Siamid).
The same procedure was carried out except that it was constructed in 03). [Comparative Example 6] The same procedure as in Example 1 was carried out except that the first layer 3 was composed of a polyester resin (Espel 1612 manufactured by Hitachi Chemical Co., Ltd.).

[Comparative Example 7] The same procedure as in Example 1 was carried out except that the first layer 3 was composed of a phenol resin (Tamanor manufactured by Arakawa Chemical Industry Co., Ltd.). [Comparative Example 8] The same procedure as in Example 1 was carried out except that the first layer 3 was composed of a vinyl chloride resin (Sekisui PVC-VE manufactured by Sekisui Chemical Co., Ltd.).

Comparative Example 9 In Example 1, the first layer 3 was made of an acrylic resin (Jurimer SEK-produced by Nippon Pure Chemical Co., Ltd.).
The same procedure was carried out except that it was constituted by 301). [Comparative Example 10] The same procedure as in Example 1 was carried out except that the first layer 3 was composed of an epoxy resin (Epokey 802-30CX manufactured by Mitsui Toatsu).

[Characteristics] Regarding the fins obtained in each of the above examples,
The press workability, the die wear resistance, the fin corrosion resistance, the weather resistance, the water wettability, the odor resistance, and the stain resistance when manufacturing the fins were examined, and the results are shown in Table 2. Table-2 Machinability Mold wear resistance Corrosion resistance Weather resistance Water wettability Odor resistance Contamination resistance Example 1 ○ ○ ○ ○ ○ ○ ○ Example 2 ○ ○ ○ ○ ○ ○ ○ Example 3 ○ ○ ○ ○ ○ ○ ○ Example 4 ○ ○ ○ ○ ○ ○ ○ Example 5 ○ ○ ○ ○ ○ ○ ○ Example 6 ○ ○ ○ ○ ○ ○ ○ Example 7 ○ ○ ○ ○ ○ ○ ○ Example 8 ○ ○ ○ ○ ○ ○ ○ ○ Comparative Example 1 ○ ○ × △ ○ ○ ○ Comparative Example 2 ○ ○ △ ○ △ ○ △ Comparative Example 3 A good coated surface was not obtained (a hydrophilic coating as a topcoat cannot be applied) Comparative Example 4 A good coated surface Not obtained (the top hydrophilic film cannot be applied) Comparative Example 5 △ ○ △ ○ △ ○ △ Comparative Example 6 ○ ○ ○ ○ × ○ × Comparative Example 7 △ ○ △ △ × ○ × Comparative Example 8 Good coated surface Was not obtained (the top hydrophilic film cannot be applied) Comparative Example 9 ○ ○ △ ○ △ ○ △ Comparative Example 10 ○ ○ ○ △ △ ○ △

[0057]

The heat exchange material of the present invention has corrosion resistance, weather resistance,
It has excellent wettability and water wettability, and an excellent heat exchange material can be obtained at low cost.

[Brief description of drawings]

FIG. 1 is a schematic view of a heat exchange material.

[Explanation of symbols]

1 Al material 2 Phosphoric acid chromate film 3 First layer 4 second layer

Front page continuation (72) Inventor Ken Katsumata, 85 Hiramatsu, Susono City, Shizuoka Prefecture, within the Technical Development Center, Mitsubishi Aluminum Co., Ltd. (72) Inventor Ichiro Saruwatari 2-33 Kyobashi, Chuo-ku, Tokyo Toyo Ink Mfg. Co., Ltd. (56) Reference JP-A-64-38228 (JP, A) JP-A-7-47329 (JP, A) JP-A-8-104828 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F28F 1/32 F28F 13/18 C09D 133/00 C09D 163/00 F28F 1/12

Claims (9)

(57) [Claims] 1. An aluminum or aluminum alloy material
When, Provided on the aluminum or aluminum alloy material
First layer containing acrylic resin and epoxy resin
When, A hydrophilic second layer provided on the first layer
Equipped withDone, Acrylic resin and epoxy resin in the first layer
Ratio with fat (acrylic resin / epoxy resin) is weight
The ratio is 50/50 to 5/95, In the second layer, particles derived from alumina sol are water-soluble.
It is covered with acrylic resin and the outside is covered with polyethylene.
Glycol and its modified products, ethylene oxide
Copolymer with propylene oxide and its modified products
There is at least one compound selected from the group
Has a structure A heat exchange material characterized by that. 2. Aluminum or aluminum alloy material
When, Provided on the aluminum or aluminum alloy material
Phosphoric acid chromate film, Acrylic based on the phosphoric acid chromate film
A first layer containing a resin and an epoxy resin; A hydrophilic second layer provided on the first layer
Equipped withDone, Acrylic resin and epoxy resin in the first layer
Ratio with fat (acrylic resin / epoxy resin) is weight
The ratio is 50/50 to 5/95, In the second layer, particles derived from alumina sol are water-soluble.
It is covered with acrylic resin and the outside is covered with polyethylene.
Glycol and its modified products, ethylene oxide
Copolymer with propylene oxide and its modified products
There is at least one compound selected from the group
Has a structure A heat exchange material characterized by that. 3. The first layer has a thickness of 0.1 to 5 μm.
Heat exchange material according to claim 1 or claim 2, characterized in that. 4. The first layer comprises a surfactant and a silicon-based material.
Claim 1-Claim 3 characterized by not containing an additive.
Either heat exchange material. 5. The second layer has a surface roughness (center line average).
Roughness Ra) is 0.1-1 micrometer, The heat exchange material in any one of Claims 1-4 characterized by the above-mentioned. 6. The second layer has a thickness of 0.01 to 5 μm.
It is m, The heat exchange material in any one of Claims 1-5 characterized by the above-mentioned. 7. Alumina sol-derived material contained in the second layer
The particles have a non-spherical morphology, and their average
The heat exchange material according to any one of claims 1 to 6, which has a particle size of 0.01 to 20 µm . 8. Content of inorganic particles contained in the second layer
Is 5 to 50 wt%, The heat exchange material according to any one of claims 1 to 7. 9. The content of the hydrophilic resin contained in the second layer
Is 50 to 95 wt% .
The heat exchange material according to claim 8.