JP2011237145A - Aluminum fin material for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum fin material for a heat exchanger which is less susceptible to become frosted.SOLUTION: A frost formation inhibitor containing one or more antifreezers or one or more antifreeze proteins or a mixture thereof is combined into at least one surface treatment coating film on a substrate consisting of an aluminum or an aluminum alloy, which gives the aluminum fin material a frosting suppression characteristic which makes frost formation or ice accretion harder by decreasing a temperature at which water vapor adheres to the fin surface of an outdoor heat exchanger becoming not water but frost or ice, that is, a freezing point, when the outside air temperature fall.

Description

  The present invention relates to an aluminum fin material for a heat exchanger such as an air conditioner made of aluminum (in this specification, including an aluminum alloy) having a coating film formed on the surface thereof.

  Aluminum is usually used for heat exchanger fins such as air conditioners because of its excellent thermal conductivity and workability. Conventionally, an anticorrosion film has been formed on the surface of this type of heat exchanger fin material as a base treatment layer for the purpose of suppressing the occurrence of corrosion. And as the surface treatment film on it, the condensed water generated on the surface of the fins of the indoor heat exchanger during cooling operation or the outdoor heat exchanger during heating operation in which the heat exchanger of the air conditioner is used as an evaporator A hydrophilic film is formed for the purpose of smoothly flowing down and discharging.

  In recent years, this hydrophilic film has been developed and used for the purpose of maintaining its excellent hydrophilicity even if the fin surface is contaminated (for example, Patent Document 1, Patent Document 2 and Non-patent document 1). Further, as a surface treatment film thereon, a water-soluble resin film may be formed for the purpose of improving lubricity when a fin is pressed (see, for example, Patent Document 2).

For example, the aluminum fin material of Patent Document 1 has a polymer compound having a solubility parameter of 7 to 9 [cal / cm 3] ^0.5 on aluminum and an aluminum alloy, and a solubility parameter of 12 to 16 [cal / cm]. cm3] includes as an essential component a high molecular compound is ^0.5, and the surface morphology is excellent resin aluminum fin material to hydrophilicity characterized by having a resin film is finely roughened . Moreover, the aluminum fin material of Patent Document 2 forms a corrosion-resistant film made of either one of an inorganic oxide or an organic-inorganic composite compound as a first layer, and further, a polyacrylic film as a second layer. A hydrophilic film having a thickness of 0.1 to 10 μm having a water-soluble resin content having a hydroxyl group in the molecule and any one of acid or polyacrylate is formed, and further, a third film As a layer, a water-soluble resin film having a thickness of 0.1 to 10 μm having a hydroxyl group in the molecule is formed. In Non-Patent Document 1, the relationship between the film properties, hydrophilicity, and contamination properties of the hydrophilizing agent is studied. As the properties of the treatment agent composition, the solubility parameter is greatly different from that of the contaminant, and the water absorption rate is high. In addition, it has become clear that a small amount of elution into water is required.

Japanese Patent No. 2967855 Japanese Patent No. 3383914

Research on paints by Masahiro Murata et al. 138 July 2002, p. 60-65

However, in the conventional configuration, as in the case of the aluminum fin material without surface treatment, the heat exchanger has a low air temperature as used in the heat exchanger of the outdoor unit of the air conditioner and when the air conditioner is heated. When the fin surface temperature is below freezing when used as an evaporator in this environment, frost and ice begin to adhere to the fin surface, gradually increase, and the air flow resistance continues to increase. Since the exchange capacity also decreases, the predetermined heating capacity cannot be achieved over time. In that case, the defrosting operation must be performed and the heating operation must be stopped, but from the viewpoint of comfort, it is desirable to make the heating operation as long as possible and reduce the frequency of entering the defrosting operation. The development of means to solve the problem was an issue.

  The present invention solves the above-described conventional problems, and provides an aluminum fin material having a characteristic of suppressing frost formation or freezing that suppresses frost or ice immediately even when the temperature of the fin surface falls below freezing point. The purpose is to do.

  In order to solve the above-described conventional problems, the aluminum fin material for a heat exchanger according to the present invention includes at least one surface treatment film containing one or more antifreeze agents or antifreeze protein frost formation inhibitors. It is.

  As a result, even when the heat exchanger is used as an evaporator and the surface temperature of the fins is below freezing point, the condensed water generated on the fin surface is an aqueous solution in which the antifreezing agent or antifreezing protein frosting inhibitor is dissolved. Until the freezing point or lower, the surface of the fin does not become frost or ice but exists as water, so that the heating operation time until the defrosting operation is started during the heating operation of the air conditioner can be extended.

  The aluminum fin material for a heat exchanger of the present invention is used to deposit an antifreeze or antifreeze protein blended in at least one surface treatment film even when the heat exchanger is used as an evaporator and the fin surface temperature is below freezing. Until the freezing point of the frost inhibitor falls below the freezing point, it is possible to prevent the condensed water generated on the fin surface from becoming frost or ice, so the heating operation time until the frosting operation starts during the heating operation of the air conditioner is extended. can do.

Sectional drawing of the aluminum fin material for heat exchangers in Embodiment 1 of this invention

  The invention of the first aluminum fin material for a heat exchanger includes at least one surface treatment film on a substrate made of aluminum or an aluminum alloy, one or more antifreeze agents, one or more antifreeze proteins, or Condensed water produced on the fin surface by adding a frost inhibitor composed of a mixture of the above is kept on the surface of the fin until it becomes below the freezing point of the aqueous solution from which the anti-freezing agent or antifreeze protein frost inhibitor is eluted. It has the effect of suppressing frost formation that does not become frost or ice.

  The invention of the aluminum fin material for the second heat exchanger is based on the aluminum fin material of the first invention. As one of the antifreezing agents as the frosting inhibitor, sodium chloride and chloride that are generally sprayed on the road as a snow melting agent By using any one of calcium, magnesium chloride, potassium chloride, calcium acetate, magnesium acetate, potassium acetate, and calcium acetate / magnesium acetate, the condensed water produced on the fin surface is an aqueous solution in which the antifreeze is eluted. Until the freezing point is below the freezing point, the surface of the fin does not become frost or ice but has the effect of suppressing frost formation that flows down and is discharged as water.

The invention of the aluminum fin material for the third heat exchanger is an ethylene fin material used in the aluminum fin material of the first invention, which is generally used as an antifreeze for a car radiator or the like as one of the antifreezing agents as a frosting inhibitor Condensed water generated on the fin surface is prevented from freezing by using one of alkylene glycols such as glycol and propylene glycol, polyalkylene glycols such as polyethylene glycol and polypropylene glycol, and polyhydric alcohols such as glycerin, tetrit, pentet and hexit. Until the freezing point of the aqueous solution from which the agent is eluted is not reduced to frost or ice on the surface of the fin, it has the effect of suppressing frost formation that flows down and is discharged as water.

  The invention of the aluminum fin material for the fourth heat exchanger is collected from either fish, plants, insects or fungi as one of the antifreeze proteins as the frosting inhibitor in the aluminum fin material of the first invention. By using any one of the antifreeze proteins, the condensed water generated on the fin surface flows down as water without becoming frost or ice on the fin surface until the freezing point of the aqueous solution containing the antifreeze protein is below the freezing point. , Has the effect of suppressing frost formation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the present embodiment.

(Embodiment 1)
FIG. 1 shows one side of a cross-sectional view of an aluminum fin material for a heat exchanger according to a first embodiment of the present invention. The configuration of the aluminum fin material 100 will be described below with reference to FIG.

  On the substrate 101 made of aluminum or an aluminum alloy, a corrosion resistant film 102 made of any one of an inorganic oxide, an organic / inorganic composite compound, or an organic polymer compound is formed as a base surface treatment film. Next, as the surface treatment film of the upper layer of the corrosion-resistant film 102, one or more antifreeze agents, one or more antifreeze proteins, or a frosting inhibitor made of a mixture thereof, and an organic polymer substance and an inorganic compound are used. A hydrophilic coating 103 containing a frost inhibitor having a property of suppressing frost formation is formed using a mixed compound of hydrophilic compound or hydrophilic resin as a raw material. Further, a lubricating film 104 made of a water-soluble resin is formed as the upper surface treatment film of the hydrophilic film 103 containing a frosting inhibitor.

  As one of the frost inhibitors to be added to the hydrophilic film 103 containing the frost inhibitor, sodium chloride, calcium chloride, magnesium chloride, potassium chloride, calcium acetate, magnesium acetate, which is generally sprayed on the road as a snow melting agent, is used. , Any of potassium acetate, calcium acetate / magnesium acetate chemicals, or alkylene glycols such as ethylene glycol and propylene glycol, and polyalkylene glycols such as polyethylene glycol and polypropylene glycol, which are generally used as antifreeze for car radiators, etc. One of the polyhydric alcohols of glycerin, tetrit, pentet, hexit, or any antifreeze protein collected from either fish, plants, insects or fungi is used.

  The hydrophilic film 103 containing a frost formation inhibitor is formed with a thickness of 0.1 to 10 μm.

  The hydrophilic film 103 containing a frosting inhibitor has hygroscopicity.

The hydrophilic film 103 containing a frosting inhibitor has a polymer compound having a solubility parameter of 7 to 9 [cal / cm ³ ] ^0.5 and a solubility parameter of 12 to 16 [cal / cm ³ ] ^{. 5} is included as an essential component.

  The hydrophilic film 103 containing a frosting inhibitor contains at least one of polyvinyl alcohol, nylon, and acrylic resin.

  The hydrophilic film 103 containing a frost formation inhibitor contains a water-soluble resin having a hydroxyl group in the molecule.

  Various commercially available products can be used as the frost inhibitor to be added to the hydrophilic film 103 containing the frost inhibitor, and it is desirable to use glycerin.

  The lubricating film 104 formed on the upper layer of the hydrophilic film 103 containing the frosting inhibitor has a hydroxyl group in the molecule. The lubricating film 104 has a thickness of 0.1 μm or more and 10 μm or less.

  About the aluminum fin material 100 comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  By forming a corrosion-resistant film 102 made of any one of an inorganic oxide, an organic / inorganic composite compound, or an organic polymer compound as a base surface treatment film on a substrate 101 made of aluminum or an aluminum alloy, Corrosion resistance can be improved.

  As an upper surface treatment film of the corrosion-resistant film 102, one or more antifreeze agents, one or more antifreeze proteins, or a frosting inhibitor made of a mixture thereof, and hydrophilicity of organic polymer substances and inorganic compounds When a heat exchanger is used as an evaporator, it is formed on the fin surface by forming a hydrophilic film 103 having a property of suppressing frost formation, using a mixed compound of a composite compound or a hydrophilic resin as a raw material. Condensed water generated on the fin surface is also frozen or antifreeze when the heat exchanger is used as an evaporator and the surface temperature of the fin is below freezing. Due to the freezing point depressing action of the protein frost inhibitor, the surface of the fin does not become frost or ice until it becomes below the freezing point of the aqueous solution in which the frost inhibitor is dissolved. The presence Te has an effect of suppressing frost formation that can. Thereby, the heating operation time until it enters into a defrost operation at the time of heating operation of an air conditioner can be extended, and comfort can be improved.

  Furthermore, the aluminum fin material covered with the lubricating film 104 is formed in a coil shape by forming the lubricating film 104 made of a water-soluble resin as the upper surface treatment film of the hydrophilic film 103 containing the frost inhibitor. It is possible to prevent a problem that the plates adhere to each other, and a problem that the plates adhere to the mold when processed into fins. In addition, since the water-soluble resin film 104 reacts with the underlying hydrophilic film 103, it almost flows out due to the condensed water generated when used as an evaporator, but remains slightly. There are effects and actions to improve. The lubricating film 104 does not have the above-described effect unless the thickness is 0.1 μm or more, and is desirably 10 μm or less from the viewpoint of workability and economy during coating.

  By forming the hydrophilic film 103 containing a frosting inhibitor with a thickness of 0.1 to 10 μm, excellent hydrophilicity and antibacterial and antifungal properties can be obtained economically. The upper limit of the film thickness is not particularly limited from the viewpoint of its function, but is preferably 10 μm or less in view of workability during coating.

  Since the hydrophilic film 103 containing a frosting inhibitor has hygroscopicity, a thin water film is formed on the fin surface by adsorbing moisture in the air even when it is not used as an evaporator. Since the film makes it difficult for contaminants to adhere, it can have an effect of maintaining excellent hydrophilicity.

The hydrophilic film 103 containing an anti-frosting agent has a polymer compound having a solubility parameter of 7 to 9 [cal / cm ³ ] ^0.5 and a solubility parameter of 12 to 16 [cal / cm ³ ] ^0. By including the polymer compound ⁵ as an essential component, two or more kinds of components having greatly different solubility parameters in the film cause a layer separation phenomenon in the baking process at the time of film formation. The surface can be finely roughened, and the hydrophilicity is further improved by the form effect. Further, by selecting a material having a solubility parameter greatly different from that of the contaminant attached to the fin surface of the heat exchanger, it is possible to prevent the attachment of the contaminant and maintain excellent hydrophilicity.

  A substance obtained by easily mixing a resin having excellent hydrophilicity and a frost inhibitor by the hydrophilic film 103 containing a frost inhibitor containing at least one of polyvinyl alcohol, nylon, and acrylic resin. It can be used as a raw material and can have excellent hydrophilicity and frosting-inhibiting properties.

  When the hydrophilic film 103 containing the frosting inhibitor contains a water-soluble resin having a hydroxyl group in the molecule, a hydrophilic film layer having strong adhesion is formed, and the hydrophilic film has high adhesion. Therefore, the outflow of the water-soluble resin containing a hydroxyl group can be suppressed and hydrophilic sustainability can be imparted, and in addition, contaminants are difficult to adhere and the hydrophilic sustainability is unlikely to deteriorate.

  Since the lubricating film 104 formed on the upper layer of the hydrophilic film 103 containing the frosting inhibitor has a hydroxyl group in the molecule, the hydroxyl group of the lubricating film 104 is the lower layer film of the hydrophilic film 103. Since it reacts with the polymer resin, it almost flows out due to the condensed water generated during the cooling operation, but remains slightly, so that it has the effect of further enhancing the effect of improving the hydrophilic sustainability when the contaminant is attached.

  One of the frost inhibitors to be blended in the hydrophilic film 103 containing the frost inhibitor is not particularly limited as long as it has a freezing point lowering action. Specifically, it is generally sprayed on the road as a snow melting agent. Ethylene glycol, used as an antifreeze for sodium chloride, calcium chloride, magnesium chloride, potassium chloride, calcium acetate, magnesium acetate, potassium acetate, calcium acetate / magnesium acetate or commonly used in car radiators Or alkylene glycol such as propylene glycol, polyalkylene glycol such as polyethylene glycol or polypropylene glycol, glycerin, tetrit, pentet, hexit polyhydric alcohol, or collected from either fish, plants, insects or fungi Any antifreeze protein can be used, but in particular, glycerin is available at a relatively low cost, is easy to be blended into the resin of the hydrophilic film 103, and is also safe for use as it is used for food. Are better.

  In the first embodiment, the frost inhibitor is blended in the hydrophilic film 103. However, even if the frost inhibitor is blended in the corrosion-resistant film 102 or the lubricating film 104, the same frost-inhibiting property can be obtained.

  Further, although the corrosion-resistant film 102, the hydrophilic film 103 containing the frosting inhibitor, and the lubricating film 104 have been described as being one layer each, a plurality of them are added to add other functions such as coloring and adhesion. It does not matter.

As described above, the aluminum fin material for a heat exchanger according to the present invention has the effect of suppressing frost formation that the condensed water generated on the fin surface hardly forms frost or ice on the fin surface even when the air temperature decreases. Therefore, it can be applied not only to heat exchangers for air conditioners but also to aluminum materials for construction and vehicle bodies, and the substrate can be applied to surface treatment of other metals and plastics instead of aluminum.

DESCRIPTION OF SYMBOLS 100 Aluminum fin material 101 Aluminum substrate 102 Corrosion resistant film 103 Hydrophilic film containing frost formation inhibitor 104 Lubricant film

Claims (4)

One or more antifreeze agents or one or more antifreeze proteins or at least one surface treatment film on a substrate made of aluminum or an aluminum alloy used as a fin material of a heat exchanger used in an air conditioner An aluminum fin material for a heat exchanger, characterized in that a frosting inhibitor made of a mixture thereof is blended. One of the anti-freezing agents, sodium chloride, calcium chloride, magnesium chloride, potassium chloride, calcium acetate, magnesium acetate, potassium acetate, calcium acetate / magnesium acetate, which is commonly sprayed on the road as a snow melting agent The aluminum fin material for a heat exchanger according to claim 1, wherein: As one of the antifreeze agents, it is generally used as an antifreeze solution for car radiators, etc., such as ethylene glycol and propylene glycol, etc. The aluminum fin material for a heat exchanger according to claim 1, wherein any one of monohydric alcohols is used. The aluminum fin material for a heat exchanger according to claim 1, wherein one of the antifreeze proteins is one of antifreeze proteins collected from either fish, plants, insects, or fungi.

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