JP2639956B2 - Method of manufacturing fin material for heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a method of manufacturing a fin material for a heat exchanger in which condensed water does not accumulate on its surface, and more particularly to a method of manufacturing a fin material for a heat exchanger having excellent mold and insect repellency.

[Prior art]

Some heat exchangers are provided with aluminum fins having 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. 60-246916 made for the purpose of preventing these drawbacks is to fix a superabsorbent resin powder on the surface of a fin material main body with titanium alkoxide and to condense water in the surface layer of the fin. Is to be absorbed.

[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. Accordingly, the present invention provides a heat exchanger fin material manufactured by a specific method to quickly absorb condensed water generated on the surface of the fin, and to mold and mite even when the surface layer is in a wet state. Etc. are to be effectively suppressed.

[Means for Solving the Problems]

That is, in the present invention, the organic solvent is represented by the general formula (RO) _n TiQ _4-n (wherein, R represents an alkyl group having 3 to 18 carbon atoms, n represents 2 or 4, and Q represents acetylacetonato or triacetyl). Dissolving a titanium alkoxide represented by ethanol aminato) and dispersing a superabsorbent resin powder and a ceramic powder having excellent far-infrared radiation characteristics to prepare a mixed solution. The present invention relates to a method for producing a fin material for a heat exchanger, wherein the organic solvent is evaporated to form a coating film on the surface of the aluminum thin plate by heating after coating on the aluminum sheet. In the present invention, a raw material of a substance serving as an adhesive for fixing the superabsorbent resin powder or the ceramic powder to the fin material main body is a kind of titanium alkoxide, and has a general formula (RO) _n TiQ _4-n (wherein In the formula, R represents an alkyl group having 3 to 18 carbon atoms, n represents 2 or 4, and Q represents acetylacetonate or triethanolaminate (hereinafter simply referred to as [titanium alkoxide]). Say.) Specifically, titanium tetraisopropoxide (Ti
(O-isoC ₃ H ₇ ) ₄ ], titanium tetrabutoxide [Ti (O
C ₄ H _{9) 4],} titanium tetra-2-ethylhexyl-oxide _{[Ti (OCH 2 CH (C 2} H 5) C 4 H 9) 4 ], titanium tetra-heptadecyl oxide [Ti (OC ₁₇ H _{35) 4]} , titanium diacetylacetonatobis di isopropoxide [Ti (OC (CH ₃₎ CHCOC
H ₃ ) ₂ (O-isoC ₃ H ₇ ) ₂ ], titanium ditriethanol aminato dibutoxide [Ti (OC ₂ H ₄ N (C ₂ H ₄ OH) ₂ )
₂ (OC ₄ H ₉ ) ₂ ]. Titanium alkoxide is a colorless or pale yellow viscous liquid or fixed at room temperature,
The film is formed by evaporating the organic solvent by heating after dissolving in an organic solvent. In the present invention, as the organic solvent for dissolving the titanium alkoxide, for example, isopropanol, butanol,
Cellosolve, carbon tetrachloride, hexane, benzene, toluene, methyl chloroform and the like are used. The amount of titanium alkoxide dissolved is 1 to 50 with respect to 100 parts by weight of the organic solvent.
It is preferably about parts by weight. If the dissolution amount is less than 1 part by weight, it tends to be difficult to form a continuous coating film on the surface of the aluminum thin plate. On the other hand, if it exceeds 50 parts by weight, the coating film tends to be thick, and the adhesive strength to the aluminum sheet surface tends to decrease. A mixed solution is prepared by dispersing a highly water-absorbent resin powder and a ceramic powder having excellent far-infrared radiation characteristics (hereinafter simply referred to as “ceramic powder”) in an organic solvent in which titanium alkoxide is dissolved. The superabsorbent resin is a high molecular polymer that absorbs and retains water at least 100 times its own weight, such as a starch-acrylonitrile graft polymer and a starch-acrylate graft polymer. Self-crosslinked polyacrylates, acrylic acid-acrylonitrile ten-polymer, crosslinked polyacrylates, and the like. In particular, a crosslinked product of a polymer mainly composed of a polyacrylate is preferred because it is selected for 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 amount of the superabsorbent resin powder dispersed in the organic solvent is preferably about 10 to 200 parts by weight per 100 parts by weight of titanium alkoxide. If the amount of dispersion of the superabsorbent resin powder is less than 10 parts by weight, the amount of condensed water absorbed tends to decrease relatively. If the amount exceeds 200 parts by weight, the amount of titanium alkoxide becomes relatively small, and the ability of the titanium alkoxide to bond the superabsorbent resin powder to the aluminum thin plate tends to decrease. The amount of the ceramic powder dispersed in the organic solvent is preferably about 1 to 150 parts by weight based on 100 parts by weight of the titanium alkoxide. If the acid content of the ceramic powder is less than 1 part by weight, the amount of far-infrared radiation is small, and the bactericidal action on the highly water-absorbent resin powder and the like tends to decrease. If the amount exceeds 150 parts by weight, the amount of the titanium alkoxide or the superabsorbent resin powder becomes relatively small, and the adhesive strength to the aluminum thin plate and the water absorbing power of the condensed water tend to decrease. The mixed solution prepared as described above is applied to the surface of the aluminum sheet. A coating film obtained from titanium alkoxide and a thin aluminum plate show good adhesion. It is considered that the reason for this is that an intermolecular force such as A1-O-Ti or Al-Ti acts. When the aluminum sheet coated with the mixed solution is heated, the organic solvent evaporates, and the titanium alkoxide forms a coating film. Then, the superabsorbent resin powder and the ceramic powder are bonded to the aluminum thin plate by this coating film. The superabsorbent resin powder and ceramic powder are abundant on the outermost surface of the coating film due to the so-called migration effect due to evaporation of the organic solvent, and gradually decrease toward the inside of the coating film (the surface bonded to the aluminum thin plate). Exist.

[Action]

In the fin material for a heat exchanger obtained by the method of the present invention, the superabsorbent resin powder fixed by the coating film absorbs and retains condensation generated on the surface of the fin. In addition, the ceramic powder selectively emits far-infrared rays, and emits far-infrared rays to the highly water-absorbent resin powder and the titanium alkoxide as an adhesive to exert a bactericidal action. Titanium alkoxide is for fixing a superabsorbent resin powder or ceramic powder to the surface of an aluminum thin plate.

【Example】

Example A superabsorbent resin powder (manufactured by Sumitomo Chemical Co., Ltd.) composed of 100 g of titanium tetraisopropoxide (manufactured by Nippon Soda Co., Ltd., product number A-1 (TPT)) and crosslinked product of polyecrylate in 500 g of cellosolve, Ceramic powder (Zircon 65g parts by weight, excellent in far-infrared radiation characteristics)
Titanium oxide 15 parts by weight, manganese dioxide 13 parts by weight, manganese dioxide 13 parts by weight, ferric oxide 5 parts by weight, chromium oxide 2
A mixed solution was prepared by adding 10 g of a ceramic obtained by mixing and weighing parts by weight and sintering. After applying this mixed solution to a fin material body made of an aluminum thin plate having a thickness of 0.13 mm and dimensions of 200 mm × 300 mm,
Cellosolp was evaporated by heating to 120 ° C. As a result,
Titanium tetraisopropoxide formed a coating film having a thickness of about 0.05 mm and fixed the superabsorbent resin powder and ceramic powder to an aluminum thin plate. The thickness of the coating is about 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 condensed water was absorbed and retained in the superabsorbent resin powder in the mixed layer. After 6 months, no mold was formed on the surface of the fin, and no insects such as mites were found. 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 the fin, and the condensed water was absorbed and retained in the superabsorbent resin powder in the mixed layer, but black mold was observed on the surface of the fin after 6 months. Was.

【The invention's effect】

As described above, the fin material for a heat exchanger obtained by the method of the present invention is capable of dispersing condensed water on a surface layer (a coating film obtained from titanium alkoxide and a superabsorbent resin) without causing condensed water to stay on its surface. Powder and ceramic powder). Therefore, it is possible to prevent the air passage between the fins from being pinched by the influence of the condensed water, thereby reducing the amount of air flow and generating 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 highly water-absorbent resin powder and the titanium alkoxide as an adhesive, it is possible to prevent mold and mites from being generated in the highly water-absorbent resin powder and the like by the sterilizing action of far-infrared rays. Can be prevented. Therefore, by using the fin agent for heat exchanger obtained by the method of the present invention, it is possible to eliminate the adverse effect of the condensed water generated on the surface of the fin and to keep the cooling device and the house clean.

Claims (1)

(57) [Claims] (1) An organic solvent represented by the general formula (RO) _n TiQ _4-n (wherein, R represents an alkyl group having 3 to 18 carbon atoms, n represents 2 or 4, and Q represents acetylacetonato or triacetyl). The titanium alkoxide represented by ethanol aminato) is dissolved, and at the same time, a mixed solution is prepared by dispersing a highly water-supplying resin powder and a ceramic powder excellent in far-infrared radiation characteristics.
Then, the mixed solution is applied to the surface of the aluminum sheet and heated to evaporate the organic solvent to form a coating film on the surface of the aluminum sheet, thereby producing a fin material for a heat exchanger.