JP2567358B2 - Fin material for heat exchanger - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

TECHNICAL FIELD The present invention relates to a fin material for a heat exchanger in which condensed water is prevented from accumulating on the surface thereof, and more particularly to a fin material for a heat exchanger excellent in antifungal property and insect proof property.

[Prior art]

Some heat exchangers are provided with fins made of aluminum, which has excellent heat conductivity, in order to improve heat exchange efficiency. When cooling is performed using this heat exchanger, warm air is cooled between the fins. At this time, condensed water may adhere to the surfaces of the fins. The condensed water that has adhered and stayed may narrow the air passage between the fins, reducing the amount of air flow or generating noise. Further, the condensed water may be scattered in the ventilation direction and may contaminate various parts of the cooling device and various parts of the house. The invention according to Japanese Patent Application No. 60-221645 made for the purpose of preventing these drawbacks is to fix the superabsorbent resin powder on the surface of the fin body to absorb condensed water into the surface layer of the fin. It is something to try.

[Problems to be Solved by the Invention]

However, in this method, since the surface layer of the fin that has absorbed the condensed water is in a wet state for a long period of time, mold may be generated on the surface of the fin, or pests such as mites may be generated. The generation of mold may cause an unpleasant odor in the house, or the occurrence of ticks may cause the residents to feel itchy or even suffer from infectious diseases. Therefore, the present invention, by adopting a certain configuration as the surface layer of the fin, quickly absorbs condensed water generated on the surface of the fin, and even if the surface layer is in a wet state, mold, mites, etc. It is intended to effectively suppress the occurrence of.

[Means for Solving the Problems]

That is, the present invention relates to a fin material for a heat exchanger, characterized in that a mixed layer of an adhesive, a highly water-absorbent resin powder, and a ceramic powder having excellent far-infrared radiation characteristics is formed on the surface of the fin material main body. Is. As the fin material main body, any material can be used as long as it has good heat conductivity, but in particular, it is excellent in heat conductivity, easy to perform various molding processes, and light in weight. Aluminum sheet is most preferred. As the adhesive, a conventionally known adhesive can be used, for example, thermosetting resin adhesive such as phenol resin, resorcin resin, polyurethane resin, epoxy resin, polyvinyl acetate, polyvinyl alcohol, polyvinyl butyral, polyacrylic acid. A thermoplastic resin adhesive such as ester can be used. Among these, especially acrylic acid
A copolymer of acrylic acid ester or the like is preferable because it has a carboxylic acid group in its side chain and is highly hydrophilic. Also,
Those having a hydroxyl group in the side chain, such as polyvinyl alcohol and polyvinyl butyral, are preferable because they are highly hydrophilic. The super absorbent polymer is a polymer that absorbs and retains 100 times or more of its own weight of water, such as starch-acrylonitrile graft polymer, starch-acrylate graft polymer, and polyacrylate self-polymer. Examples thereof include crosslinked products, acrylic acid-acrylonitrile copolymers, and polyacrylic acid crosslinked products. In particular, a cross-linked product of a polymer mainly composed of polyacrylic acid salt is preferable because it has excellent water absorption. Ceramic powder with excellent far-infrared radiation properties was obtained by blending oxides such as titanium, cobalt, chromium, nickel, manganese, iron and magnesium with alumina, silica and zircon as the main components and firing. Ceramic powder is used. The size of the powder is preferably such that it is easy to be uniformly dispersed in the solution.
About 05μ is preferable. The following method is used to form a mixed layer of an adhesive, a highly water-absorbent resin powder, and a ceramic powder having excellent far-infrared radiation characteristics on the surface of the fin body. First, an organic solvent that dissolves the adhesive (typically, toluene or β-oxyethyl ether (hereinafter, simply referred to as “cellosolve”) is prepared.) Is prepared, and a highly water-absorbent resin powder is added to this. An adhesive (which may be solid or liquid) and ceramic powder having excellent far-infrared radiation characteristics are added. The blending ratio of these may be any as desired, but with respect to 100 parts by weight of the highly water-absorbent resin powder, about 50 to 1000 parts by weight of the adhesive and the ceramic powder 5 having excellent far infrared radiation characteristics are used. ~ 100 parts by weight is recommended. The super absorbent polymer powder absorbs a large amount of water, but does not absorb the organic solvent and disperses in its original form. Further, ceramic powder having excellent far-infrared radiation characteristics is also dispersed as it is. Then, the adhesive becomes a solution. In this way, a dispersion liquid in which the highly water-absorbent resin powder, the ceramic powder having excellent far-infrared radiation characteristics, and the adhesive are uniformly mixed can be obtained. It is preferable to use a surfactant to disperse the highly water-absorbent resin powder because the dispersibility is improved. Then, the dispersion liquid is applied to the surface of the fin material main body and dried to form a mixed layer of the adhesive, the highly water-absorbent resin powder, and the ceramic powder having excellent far-infrared radiation characteristics.

[Action]

In the present invention, the highly water-absorbent resin powder in the mixed layer absorbs and retains condensed water generated on the surface of the fin. Further, the ceramic powder having excellent far-infrared radiation characteristics selectively emits far-infrared rays, and emits far-infrared rays to the highly water-absorbent resin powder or the adhesive to exert a bactericidal action. The adhesive is for fixing the highly water-absorbent resin powder or the ceramic powder having excellent far-infrared radiation characteristics to the surface of the fin material body.

【Example】

Example Acrylic acid-acrylic acid ester copolymer (manufactured by NOF CORPORATION, trade name MODEL PEARL) 100 g in 500 g of Cellosolve
Water-absorbent resin powder (Sumitomo Chemical Co., Ltd., trade name Sumikagel) 50 g consisting of a cross-linked product of poly (acrylic acid) and poly (acrylic acid), and a ceramic powder (65 parts by weight zircon, 15 parts by weight titanium dioxide) having excellent far-infrared radiation characteristics. Ceramics obtained by mixing 13 parts by weight of manganese, 5 parts by weight of ferric oxide, and 2 parts by weight of chromium oxide and firing, with a particle size of 0.1 μ) of 15 g, and stirring to obtain a dispersion liquid. It was This dispersion has a thickness of 0.13
mm, the size was 200 mm x 300 mm, and applied to a fin material body made of an aluminum thin plate and dried to form a mixed layer of an adhesive, a highly water-absorbent resin powder, and a ceramic powder having excellent far-infrared radiation characteristics. The thickness of the mixed layer was 0.05 mm. This fin material was perforated in a predetermined manner and attached as a fin of a heat exchanger. As a result, no water appeared on the surface of the fin, and the condensed water was absorbed and retained in the superabsorbent resin powder of the mixed layer. Further, even after 6 months, no mold was generated on the surface of the fin, and no insects such as mites were observed. Comparative Example Fins were obtained in exactly the same manner as in Example except that ceramic powder having excellent far-infrared radiation characteristics was not used. No water appeared on the surface of this fin, and the condensed water was absorbed and retained in the superabsorbent resin powder of the mixed layer, but after the lapse of 6 months, generation of black mold was observed on the surface of the fin. .

As described above, the fin material for a heat exchanger according to the present invention absorbs and retains the condensed water in the surface layer (mixing layer) without retaining the condensed water on the surface thereof. Therefore, it is possible to prevent the air passage between the fins from being narrowed due to the influence of the condensed water to reduce the amount of ventilation and to generate noise. Furthermore, since the condensed water can be prevented from scattering in the ventilation direction, it is possible to prevent the cooling device and the house from being soiled. Since the ceramic powder emits far infrared rays to the super absorbent polymer powder and the adhesive, the sterilizing action of the far infrared rays can prevent the super absorbent polymer powder from generating molds and mites. it can. Therefore, by using the fin material for a heat exchanger according to the present invention, it is possible to eliminate the adverse effect of condensed water generated on the surface of the fin and to keep the cooling device and the house clean.

Claims (1)

(57) [Claims] 1. A fin material for a heat exchanger, characterized in that a mixed layer of an adhesive, a highly water-absorbent resin powder, and a ceramic powder having excellent far-infrared radiation characteristics is formed on the surface of the fin material main body.