JPH0545083A - Self-deodorizing heat exchanger al fin materials - Google Patents

Abstract

PURPOSE:To provide a self-deodorizing heat exchanger Al fin material which prevents the generation of odor during press work. CONSTITUTION:There are formed moisture-dispersion silica mixed with a micro- capsule which includes a deodorant and a hydrophilic film made of hydrophilic organic resin on the surface of an Al fin material. The hydrophilic film is adapted to further contain an antimold by 1 to 30%. It is also arranged to contain an interfacial active agent by 1 to 20%. A chrome acid chromate film or a coat type chromate film is applied for the prime coat treatment of a hydrophilic film.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a self-deodorizing heat exchanger A.
The present invention relates to a l-fin material, and is intended to prevent an offensive odor generated during the fin pressing process.

[0002]

2. Description of the Related Art Al fin materials for heat exchangers have a resin component in a hydrophilic film which is coated on the surface during press working, which causes heat generation or partial powdering due to ironing. When peeled off, there was a problem that an offensive odor was generated and the working environment was deteriorated.

[0003]

As a result of various studies in view of the above, the present invention needs to prevent the offensive odor generated during press working, and at the same time, apply a hydrophilic coating and bake after assembling the heat exchanger. This is an aluminum fin material for self-deodorizing heat exchangers.

That is, one of the Al fin materials of the present invention is that a hydrophilic film made of a hydrophilic organic resin and water-dispersible silica mixed with microcapsules containing a deodorant is formed on the surface of the Al fin material. It is characterized by. Another one of the Al fin materials of the present invention is a hydrophilic topcoat layer formed by forming a hydrophilic film composed of water-dispersible silica and a hydrophilic organic resin on which microcapsules containing a deodorant are mixed. It is characterized by being provided. And in any fin material, 1 to 30% of antifungal agent is contained in the hydrophilic film, 1 to 20% of surfactant is contained in the hydrophilic film, and chromic acid is used as the surface treatment of the hydrophilic film. It is effective to apply a chromate film or a coating type chromate film containing an organic resin. ..

[0005]

According to the present invention, as described above, a hydrophilic coating made of water-dispersible silica mixed with microcapsules containing a deodorant and a hydrophilic organic resin is coated on both sides of an Al strip for fins in advance. During processing, the microcapsules in the film of the processed part break and the deodorant inside oozes out to deodorize. The microcapsules do not break in the unprocessed area, and the surface of the fins is not contaminated with excess deodorant.

As the deodorant to be included, polyphenols (flavan-3-ol, 2'-oxy-2,4,
4,7,4'-pentamethylflavan, etc.), a cyclodextrin, a long-chain betaine compound, or other synthetic product, or a plant deodorant composed of a tea extract component.

As the water-dispersible silica, it is preferable to use colloidal silica, water glass or the like as a base material with various additives added, and the hydrophilic organic resin is preferably an acrylic resin.

Mixing 1 to 30% of antifungal agent in the hydrophilic film can effectively suppress the generation of mold on the fin surface. However, if it is less than 1%, there is no effect, and if it exceeds 30%, the hydrophilicity is deteriorated or the film is apt to be eluted in water.

By incorporating a surfactant in an amount of 1 to 20% into the film, the coatability is improved, and the fungicide is assisted to move in the film to improve the antifungal durability. However, if it is less than 1%, there is no effect, and if it exceeds 20%, the film is liable to dissolve in water and deterioration over time becomes large, which is not preferable.

Corrosion resistance can be improved by providing a chromate chromate film in an amount of 5 to 40 mg / m ² as a base treatment for the hydrophilic film. However, if it is less than 5 mg / m ² , there is no effect, and if it exceeds 40 mg / m ² , the fin material is easily cracked during press working, which is not preferable.

[0011]

EXAMPLES The present invention will be described below with reference to examples.

(Example 1) Industrial pure Al having a plate thickness of 0.105 mm
The degreasing and chemical conversion treatments are continuously applied to the strip, and the Cr content is 20 mg / m.
Form a chromate chromate film of ² . In addition, microbeads containing TBE, a benzimidazole fungicide, anionic surfactant, water-dispersible silica, hydrophilic acrylic resin, and cyclodextrin with an outer diameter of about 0.1 μm in a solid content of 10% by weight. %, 10%, 24%, 55%,
A coating material mixed at a ratio of 1% was applied, and baked and dried at 120 ° C. for 15 seconds to form a film having a Si content of 60 mg / m ² to prepare an Al fin material of the present invention. For comparison, a comparative Al fin material was prepared by forming the same film as in the above-mentioned example except for the microcapsules.

With respect to the Al fin material of the present invention and the comparative Al fin material thus produced, a Hidaka drawless fin forming die (2.5 / 8 × 4 rows × 2 pitch feed) was used as a die and the forming speed was 0.48 m / Press molding was performed by using Idemitsu Kosan Daphne Punch Oil AF-8 as the press oil at sec, and the odor during molding was examined.

As a result, a strong offensive odor was generated with the comparative Al fin material, but no offensive odor was observed with the Al fin material of the present invention.

(Example 2) Industrial pure Al having a plate thickness of 0.105 mm
Continuously degreasing and chemical conversion treatment, Cr content is 20mg
Chromate chromate film of / m ² is formed, and TBZ of benzimidazole fungicide, anionic surfactant, water-dispersible silica, hydrophilic acrylic resin is added to the solid content of 10% by weight, Paint mixed with 10%, 24%, and 55% was applied, and baked and dried at 200 ° C for 15 seconds to form a film with a Si content of 120 mg / m ² . After that, a coating material containing 10% of microcapsules with an outer diameter of about 0.1 μm containing cyclodextrin and mixing water-dispersible silica and anionic surfactant in a weight ratio of 1: 1 was applied, and the temperature was 120 ° C. After baking and drying for 10 seconds, an overcoat layer having an amount of Si in the film of 10 mg / m ² was formed to form an Al film
A fin material was produced. For comparison, an Al fin material for comparison was prepared by forming a film without the above-mentioned overcoat layer.

With respect to the Al fin material of the present invention and the Al fin material for comparison thus produced, a Hidaka drawless fin forming die (2.5 / 8 inch × 4 rows × 2 pitch feed) was used as a die, and the forming speed was 0.48. Press molding was performed using Idemitsu Kosan Daphne Punch Oil AF-8 as the press oil at m / sec, and the odor during molding was examined.

As a result, a strong offensive odor was generated in the comparative Al fin material, but no offensive odor was observed in the Al fin material of the present invention.

[0018]

As described above, according to the present invention, by using the microcapsules containing the deodorant, the offensive odor generated during the press working of the Al fin material can be prevented.
Further, since it has a hydrophilic and corrosion-resistant film on the surface, it is not necessary to apply or bake a hydrophilic paint after assembling the heat exchanger, which is a significant industrial effect.

Claims (8)

[Claims] 1. A self-deodorizing property, characterized in that a hydrophilic film made of a hydrophilic organic resin and water-dispersible silica mixed with microcapsules containing a deodorant are formed on the surface of an Al fin material. Al fin material for heat exchangers. 2. The self-deodorizing Al fin material for a heat exchanger according to claim 1, wherein the hydrophilic film contains 1 to 30% of an antifungal agent. 3. The Al fin material for a self-deodorizing heat exchanger according to claim 1 or 2, wherein the hydrophilic film contains 1 to 20% of a surfactant. 4. The Al fin material for a self-deodorizing heat exchanger according to claim 1, wherein a chromate chromate film or a coating type chromate film containing an organic resin is provided as a surface treatment of the hydrophilic film. 5. A hydrophilic coating layer comprising a water-dispersible silica and a hydrophilic organic resin formed on the surface of an Al fin material, and a hydrophilic topcoat layer containing microcapsules containing a deodorant mixed thereon is provided. An aluminum fin material for a self-deodorizing heat exchanger, characterized in that 6. The Al fin material for a self-deodorant heat exchanger according to claim 5, wherein the hydrophilic film contains 1 to 30% of an antifungal agent. 7. The Al fin material for a self-deodorant heat exchanger according to claim 5, wherein the hydrophilic film contains 1 to 20% of a surfactant. 8. The Al fin material for a self-deodorizing heat exchanger according to claim 5, 6 or 7, wherein a chromate chromate film or a coating type chromate film containing an organic resin is provided as a surface treatment of the hydrophilic film.