JP2009297995A - Deodorized and aluminum-made fin material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aluminum-made fin material which not only keeps a sufficient deodorizing effect even when it is used for a long term under the state where a nasty smell, a bad smell or the like arises, but can be manufactured without a forming problem. <P>SOLUTION: The deodorized and aluminum-made fin material has an anti-corrosive resin coat layer formed on a chromate treatment layer formed on an aluminum or aluminum alloy plate and an acidic group-containing water-soluble resin coat layer formed on the anti-corrosive resin coat layer, wherein either one or both of the anti-corrosive resin coat layer and the water-soluble resin coat layer contain a deodorant removing the acidic smell component. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is an aluminum fin material that is applied to heat exchange fins such as air conditioners, and is deodorized on the surface so that the deodorizing effect can be maintained even when used for a long time in a strange odor environment unique to air conditioners. The present invention relates to a fin material made of aluminum or aluminum alloy (hereinafter abbreviated as “aluminum”) having a high formability that has been treated.

  Conventionally, a deodorizing functional element such as activated carbon is generally used as a deodorizing measure for a device incorporating a heat exchanger using an aluminum fin material such as an air conditioner that cannot avoid the occurrence of bad odor during use. It is. In a typical method, fins are formed by using an aluminum plate on which a coating film of a resin in which a porous material having a large number of micropores is mixed, such as activated carbon formed into a granular shape, is formed on the surface in advance. If this treatment is performed, the odor component in the air that comes into contact with the resin coating film during use of the device is adsorbed in the micropores of the porous material, and the air passing through the heat exchanger is deodorized.

  However, the following problems remain in activated carbon, zeolite, silica gel, activated alumina, and the like that are currently in practical use as deodorizing elements. In other words, all of these deodorizing elements have a low adsorption capacity for odorous substances, and as the amount of adsorption increases, the equilibrium adsorption concentration, which is an indicator of the deodorizing capacity, increases. Reduce. On the other hand, the resin coating film containing the deodorizing element also has a problem that unevenness derived from coating or the like remains, the press formability to the fin is extremely poor, and the processing is difficult.

  In order to overcome such limitations and deterioration of deodorizing performance, a method of using a photocatalyst such as titanium oxide and oxidatively decomposing odorous substances adsorbed on the surface by irradiation with light such as ultraviolet rays has been put into practical use. This method is considered to have almost no deterioration in deodorization performance, but if the equipment is used under conditions where light irradiation is not sufficient, oxidative decomposition of odorous substances does not proceed reliably, so that sufficient deodorization performance is achieved. There is a possibility that it cannot be expected.

  In order to solve this problem, the following Patent Document 1 is disclosed as an invention in which an adsorbent and a photocatalyst are mixed and a deodorizing function based on the interaction between them is expected. The present invention lacks the ability to adsorb high-concentration malodorous gas even when activated carbon is used, and the deodorization efficiency cannot be satisfied by ultraviolet irradiation toward photocatalysts such as titanium oxide and decomposition of malodorous components by ozone. We propose deodorizing means to improve

  The disclosed invention is characterized in that an adsorbent and a photocatalyst are used in combination, activated carbon, alumina or silica is used as the adsorbent, an oxide semiconductor such as titanium or tin is used as the photocatalyst, and a mixture thereof. Is then sintered into a porous pellet or honeycomb to form a deodorant.

Although this deodorizer has a high decomposition rate of malodorous components and can be maintained for a long time and can improve deodorization efficiency, it can be applied as a deodorizer for aluminum fins that require fine mechanical forming processing. However, the problem of moldability still remains from the structural aspect of this deodorizer, and it does not lead to a fundamental solution.
Japanese Unexamined Patent Publication No. 01-218635

  The present invention is not only capable of sustaining a sufficient deodorizing effect even when used for a long period of time in a situation where an odor environment such as a strange odor or bad odor is generated, but it is made of aluminum which does not cause a problem in formability in terms of production. The object is to put to practical use a deodorizing means capable of providing a fin material.

The present invention is characterized by the following means in order to solve the above problems.
(1) A corrosion-resistant resin coating layer is formed on a chromate-treated layer formed on the surface of aluminum or an aluminum alloy plate (hereinafter abbreviated as “aluminum plate”), and further on the corrosion-resistant resin coating layer. In addition, a water-soluble resin coating layer having an acidic group was formed, and one or both of the corrosion-resistant resin coating layer and the water-soluble resin coating layer was subjected to deodorization treatment containing a deodorizing agent for removing acidic odor components. Aluminum fin material.
(2) Cellulose water-soluble resin, acrylic water-soluble resin, polyvinyl alcohol-based water-soluble resin, or polyvinyl pyrrolidone-based water-soluble resin in which the water-soluble resin coating layer contains one or more of carboxyl group, hydroxyl group or sulfone group 2. The deodorized aluminum fin material according to 1 above, which is a seed or two or more water-soluble resins.
(3) Deodorizers that remove acidic odor components are iodine charcoal, alkali-impregnated activated carbon, untreated charcoal, metal oxides such as potassium permanganate, activated alumina, metal phthalocyanine complex or synthetic hydrotalcite, double hydroxide 3. The deodorized aluminum fin material according to the above 1 or 2, which is one or more deodorizers of a hybrid compound of a metal oxide and a metal oxide.
(4) The thickness of the corrosion-resistant resin coating layer is 0.3 μm or more and 2.0 μm or less, and the thickness of the hydrophilic resin coating layer is 0.3 μm or more and 2.0 μm or less. The deodorized aluminum fin material described.

  The deodorized aluminum fin material of the present invention has a high moldability at the time of molding into fins, and is used in an air conditioner that is used for a long time in a humid atmosphere where the presence of condensed water is inevitable. Even if it is mounted as a fin, the coating film can be prevented from deteriorating, and the deodorizing function imparted at the time of production can be reliably maintained.

  The deodorized aluminum fin material of the present invention is based on pure aluminum or an aluminum alloy plate of the required composition, and a chromate treatment layer is formed in advance on both the front and back surfaces, and two resin coating layers are applied thereon. Is done. This chromate treatment is a corrosion-resistant ground treatment usually performed in the production of this kind of aluminum fin material. For example, a phosphate chromate treatment layer is preferably formed.

  On this chromate treatment layer, a corrosion-resistant resin coating layer is formed as a lower layer, and a water-soluble resin coating layer is formed thereon. This is because when aluminum fins are applied to an air conditioner or the like, the fins themselves are exposed to a corrosive environment in a humid atmosphere where condensed water exists. In fact, when aluminum fins with only a water-soluble resin coating layer lacking a corrosion-resistant resin coating layer are exposed to such an environment, corrosion proceeds to the aluminum base material under the water-soluble resin coating layer, which is caused by this. The deterioration of the coating film increases with time.

  Therefore, by forming a corrosion-resistant resin coating layer between the water-soluble resin coating layer and the aluminum base material to improve the corrosion resistance, it is possible to prevent deterioration of the coating film even after using the air conditioner for a long time, deodorizing effect Can last.

  The corrosion-resistant resin coating layer need not employ a special resin, and for example, an epoxy resin, an acrylic resin, a polyurethane resin, or the like can be used.

  In the present invention, two types of resin coating layers, namely, a corrosion-resistant resin coating layer and a water-soluble resin coating layer are formed, and a deodorizing agent that removes acidic odor components is included in one or both of the layers. It is a feature.

  The type of the acidic odor component depends on the use environment of the heat exchange device in which the aluminum fin material is incorporated, but hydrogen sulfide, acetic acid, or acetaldehyde is common, including ammonia. As a deodorant for removing these acidic odor components, although no special chemical is required, iodine charcoal, alkali-impregnated activated carbon, untreated charcoal, potassium permanganate, activated alumina, metal phthalocyanine complex, Furthermore, it is desirable to use a synthetic hydrotalcite, a hybrid compound of double hydroxide and metal oxide, which is a selective feature of the present invention.

  One of these is blended alone or in combination of two or more. In particular, if a metal oxide or metal phthalocyanine complex that dissolves in a harmless solvent such as water or alcohol is employed, the unevenness on the surface of the aluminum plate is eliminated, and the moldability to the fin is remarkably improved.

  In addition, the above-mentioned deodorizing agent exerts the above effect even if it is blended in only one of the corrosion-resistant resin coating layer or the water-soluble resin coating layer. Deodorizing action also works when the water penetrates, and a higher effect can be expected. If blended into only one of the layers, it is more advantageous in terms of immediate effect to include it in the water-soluble resin coating layer than the corrosion-resistant resin coating layer.

  Next, the water-soluble resin coating layer coated on the outermost surface via the corrosion-resistant resin coating layer on the surface of the aluminum substrate is a feature of the present invention that it is a water-soluble resin having an acidic group. Alternatively, hydrophilicity is imparted to the resin by containing polyacrylic acid, polyacrylic acid salt, polyvinyl alcohol, carboxymethyl cellulose, polyvinyl pyrrolidone or a copolymer or mixture thereof containing one or more sulfone groups.

  That is, the odorous substance contained in the air forms a weak bond with the carboxyl group, hydroxyl group or sulfone group of the acidic group of the water-soluble resin coating layer, and exhibits a deodorizing effect. In addition, when used as a heat exchanger, the condensed water adhering to the surface of the fin flows smoothly through the hydrophilic surface of the water-soluble resin coating layer, and at the same time, the odor substance that forms a weak bond with the surface is also present. It will be washed away to show an additional deodorizing effect. The water-soluble resin coating layer of the present invention also has such high hydrophilicity.

  The film thickness of the corrosion-resistant resin coating layer is 0.3 μm or more and 2.0 μm or less (0.3 μm to 2.0 μm), preferably 0.5 μm or more and 1.5 μm or less (0.5 μm to 1.5 μm). And When the film thickness is lower than the lower limit, the corrosion resistance is lowered, and when it is higher than the upper limit, the heat exchange efficiency is lowered.

The film thickness of the hydrophilic resin coating layer is 0.3 μm or more and 2.0 μm or less (0.3 μm to 2.0 μm), preferably 0.5 μm or more and 1.5 μm or less (0.5 μm to 1.5 μm). ). When the film thickness is less than or equal to the lower limit value, deodorization and hydrophilicity are reduced, and when the film thickness is greater than or equal to the upper limit value, the heat exchange efficiency is lowered.

In order to form the two types of resin coating layers, for example, a paint in which a resin component is dissolved or dispersed in a solvent is prepared, applied onto an aluminum plate by an appropriate method, and heated. In addition, these paints may be used in combination with various paint additives for the purpose of improving the paintability and workability as long as the performance of the present invention is not impaired. For example, a surfactant, a surface conditioner, a defoaming agent, a leveling agent, a rheology control agent, an antibacterial agent or an antifungal agent may be applied as necessary.
(Example) A pure aluminum-based A1200 (JIS H4000) aluminum plate having a thickness of 0.10 mm was degreased with an alkaline agent (Surf Cleaner 360 manufactured by Nippon Paint Co., Ltd.) and then subjected to a phosphoric acid chromate treatment. The adhesion amount (target value) for this phosphoric acid chromate treatment was 30 mg / m ^{2 in} terms of Cr.
Two layers of the following corrosion-resistant resin coating layer and hydrophilic resin coating layer are formed on both surfaces of the aluminum plate.

  First, the corrosion-resistant resin coating layer is formed by preparing only a water-based paint that does not contain the deodorizer listed in Table 1, and applying and heating on the aluminum plate under the adhesion amount and heating conditions described in Table 3. did. In addition, application | coating of the coating material used the bar coater, heating used the hot air drying furnace, and the heating temperature was confirmed with the heat seal tape.

  Next, as described in Table 2, the hydrophilic resin coating layer is prepared by mixing a water-based paint divided into a configuration not including a deodorant and a configuration including the same, and this is formed on the corrosion-resistant resin coating layer. It was formed by coating and heating under the adhesion amount and heating conditions described in 1. In addition, application | coating of a coating material and heating were performed by the method similar to the time of the said corrosion-resistant resin coating layer formation.

  As the deodorizer, phthalocyanine cobalt (II) manufactured by Tokyo Chemical Industry Co., Ltd. was used. Moreover, the resin adhesion amount of Table 3 (film thickness of each resin coating layer) was measured using Fischer's ISOSCOPE MP0.

  After processing these resin-coated aluminum plates into fins by a conventional method, the deodorizing performance was evaluated for each by the following method.

  1) Each fin material was cut into 20 × 30 cm to obtain test samples.

  2) The sample was folded in a 5 L Tedlar bag and air 1 L was injected.

  3) The initial density was set as follows to obtain four types.

Ammonia: about 100 ppm (Test 1)
-Hydrogen sulfide: about 10ppm (Test 2)
Acetic acid: about 40 ppm (Test 3)
Acetaldehyde: about 20 ppm (Test 4).

  4) After injection of the test gas, the residual gas concentration was measured with a detector tube in two stages, 24 hours later (Tests 1 and 2) and 60 minutes later (Tests 3 and 4). The detector tube used is JEM 1467-1995.

  5) For comparison, an untreated aluminum plate corresponding to the base material was also evaluated in the same manner.

  6) The results of Test 1, Test 2, Test 3 and Test 4 are shown in Table 4, Table 5, Table 6 and Table 7, respectively.

Claims (4)

  A corrosion-resistant resin coating layer is formed on the chromate treatment layer formed on the surface of the aluminum or aluminum alloy plate, and a water-soluble resin coating layer having an acidic group is formed on the corrosion-resistant resin coating layer. A deodorized aluminum fin material characterized in that one or both of the coating layer and the water-soluble resin coating layer contains a deodorizing agent that removes acidic odor components.   The water-soluble resin coating layer is one or two of a cellulose-based water-soluble resin, an acrylic-based water-soluble resin, a polyvinyl alcohol-based water-soluble resin, or a polyvinyl pyrrolidone-based water-soluble resin containing one or more of a carboxyl group, a hydroxyl group, or a sulfone group. The deodorized aluminum fin material according to claim 1, wherein the fin material is a water-soluble resin of at least one species.   Deodorizers that remove acidic odor components are iodine charcoal, alkali-impregnated activated carbon, untreated charcoal, potassium permanganate, activated alumina, metal phthalocyanine complex or synthetic hydrotalcite, hybrid compound of double hydroxide and metal oxide The deodorized aluminum fin material according to claim 1 or 2, wherein the deodorizing agent is one or more deodorizers.   The thickness of the corrosion-resistant resin coating layer is 0.3 μm or more and 2.0 μm or less, and the thickness of the hydrophilic resin coating layer is 0.3 μm or more and 2.0 μm or less. Or 3 deodorized aluminum fin material.