JPH04328155A - Hydrophilization treating composition and method for hydrophilization treatment - Google Patents

Abstract

PURPOSE:To obtain a hydrophilization treating composition, capable of forming a film excellent in hydrophilicity and its persistence when used as a hydrophilization treating agent for fins, etc., made of aluminum by blending a specific hydroxyl group- and nitrogen-containing polyester resin with a curing agent. CONSTITUTION:A hydrophilization treating composition is obtained by blending (A) 97-60wt.%, preferably 95-70wt.% hydroxyl groupand nitrogen-containing polyester resin prepared by subjecting a polyhydric alcohol component composed of an alkanolamine (e.g.methyldiethanolamine) having >=2 hydroxyl groups in one molecule and a mono- or polyether diol (e.g. ethylene-propylene glycol) and a polybasic acid component composed of a 1-7C aliphatic dibasic acid (e.g. malonic acid or phthalic acid) to esterifying reaction with (B) 3-40wt.%, preferably 5-30wt.% curing agent and further, as desired, (C) an antimicrobial agent. The aforementioned composition is applied to fins made of aluminum by dip coating, shower coating, etc.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydrophilic treatment composition and a hydrophilic treatment method.

0002

[Prior art and its problems] In the heat exchanger of an air conditioner, condensed water generated during cooling becomes water droplets and forms water bridges between the fins, narrowing the air ventilation path and increasing ventilation resistance, resulting in power dissipation. Problems such as loss of energy, generation of noise, and scattering of water droplets may occur. As a precautionary measure to prevent this phenomenon, the surface of aluminum fins (hereinafter referred to as fins) is made hydrophilic to prevent the formation of water droplets and bridges caused by water droplets.

[0003] As a method for making the surface of a heat exchanger hydrophilic, 1) forming fins from an aluminum plate, assembling the fins, and then immersing them in a surface treatment agent (hydrophilic, anti-rust); , the so-called after-coat method, in which the coating is applied by means such as spraying or showering; and the so-called pre-coat method, in which a surface treatment film is formed on an aluminum plate in advance by means such as a roll coater, and then the plate is press-molded to create fins. There are two methods of law.

[0004] Regarding the former (2), methods for making the surface of the fins hydrophilic have been put to practical use: (1) a method of coating water glass represented by the general formula mSiO2/nNa2O (for example, Japanese Patent Application Laid-Open No. 1983-1993); Publication No. 13078, etc.)
(2) A method of forming a resin film by applying a solution mainly composed of an organic polymer resin such as a water-soluble polyamide resin (
For example, Japanese Patent Application Laid-Open No. 61-250495), (3)
Examples include a method of applying an aqueous resin solution made by neutralizing polycarboxylic acid resin with a basic neutralizing agent, but even though these techniques have been put into practical use, they are not fully satisfactory, and treatment There are still problems that need to be improved in terms of sustainability of hydrophilicity of the plate (water droplet contact angle, overall water leakage), corrosion resistance, odor, press workability, and stability of the treatment liquid. For example, when looking at water glass (1) above, which exhibits good hydrophilicity with a water droplet contact angle of 30 degrees or less, the treated film surface of fins treated with this material becomes powdery over time, and ventilation Occasionally, it scatters and produces a cement or chemical odor. In addition, water glass is hydrolyzed by condensed water generated during operation of the heat exchanger, making the fin surface alkaline, which makes pitting corrosion more likely to occur, and aluminum hydroxide powder (white powder), which is a corrosion product, scatters. It is known that there are environmental conservation issues. On the other hand, in the method (2) using a treatment agent, the water resistance of the film is not sufficient and the film is easily dissolved by condensed water, resulting in problems such as the sustainability of hydrophilicity on the fin surface and the effect on corrosion resistance. Yes, and the cost is high. Furthermore, in the method (3) above, there is a problem that the neutralizing agent in the resin is washed out by water over time in the resin neutralized film formed on the fin, and the hydrophilicity of the film gradually decreases, resulting in poor hydrophilicity sustainability. There is.

[0005] In addition, air conditioners have become smaller and lighter in recent years, and heat exchangers are also compactly designed, so the fin spacing has become smaller, and higher hydrophilicity is required, with a contact angle of 30° with water.
The following has become essential.

Furthermore, as the aim is to provide a comfortable living space, the generation of odor has recently become a problem. The use of coating agents mixed with antibacterial agents and preservatives has also been proposed as a countermeasure against initial paint film odors and unpleasant odors caused by microorganisms generated in air conditioners (at the start of operation). 58-10
051, JP-A-61-168675, etc.) are still insufficient.

As described above, the hydrophilic treatment agents currently in practical use in the above-mentioned (1) fin aftercoat method do not fully meet many of these demands, and are not particularly suitable for this method. There is a desire to develop a hydrophilic treatment composition that is more hydrophilic and has better odor.

[0008] The latter (2) also has problems such as deterioration of corrosion resistance due to destruction of the hydrophilic coating during fin molding.

[0009]

[Means for Solving the Problems] As a result of extensive research in order to solve the above problems, the present inventors have found that using alkanolamine and mono- or polyether diol as the polyhydric alcohol component, C1 as the acid component. ~7 We have discovered that all of the above-mentioned drawbacks can be solved by using a composition in which a curing agent is blended with a hydroxyl group-containing nitrogen-containing polyester resin made using an aliphatic dibasic acid, and we have completed the present invention.

That is, the present invention uses an alkanolamine having at least two hydroxyl groups in one molecule and a mono- or polyether diol as a polyhydric alcohol component,
The curable resin composition contains a hydroxyl group-containing nitrogen-containing polyester resin using a C1-7 aliphatic dibasic acid as a polybasic acid component and a curing agent, and preferably further contains an antibacterial agent. The present invention provides a characteristic hydrophilic treatment composition and a hydrophilic treatment method characterized by applying the composition to aluminum heat exchanger fins.

First, the hydrophilic treatment composition of the present invention will be described.

The alkanolamine, which is the polyhydric alcohol component of the hydroxyl group-containing nitrogen-containing polyester resin used in the composition of the present invention, has at least two hydroxyl groups in one molecule that can react with the carboxyl group or anhydrous carboxyl group of the dibasic acid component. A functional group containing a nitrogen atom with and a lone pair of electrons:

[
A compound having at least one of the following, for example,
Diethanolamine, triethanolamine, diisopropanolamine, triisopropanolamine, cyclohexyldiisopropanolamine, methyldiethanolamine, methylmonoethanolamine, methyldiisopropanolamine, etc. These can be used alone or in combination of two or more, and these Among these, methyldiethanolamine, methylmonoethanolamine, diethanolamine, triethanolamine and the like are particularly preferred.

[0013] Furthermore, the mono- or polyether diol used as the polyhydric alcohol component has one or more ether bonds in the molecule, preferably 1 to 200), more preferably 1 to 100, and the main chain of the molecule It is a chain compound having primary and/or secondary hydroxyl groups at both ends.

[0014] As the mono- or polyether diol,
Preferably, the following general formula (I):

Polyethylene glycol represented by [Chemical formula 2], general formula (II)
:

Polypropylene glycol represented by [Chemical formula 3], as a structural unit formula

[C4] and both ends are HOCH2CH2O- or

[Image Omitted] The above unit formulas (III) and (IV) may be singly or mutually repeated, and the unit formula (III)
) and (IV) are ethylene-propylene glycol in which the total is n.

In the above general formulas (I) and (II), n
and n, which is the total number of unit formulas (III) and (IV), is an integer of 2 to 200, preferably 2 to 100. The n
If the number is less than 2, a film with excellent hydrophilicity cannot be formed, while if it exceeds 200, water resistance, corrosion resistance, etc. will deteriorate, which is not preferable.

The polybasic acid component has two carboxyl groups in one molecule and one anhydride carboxyl group in one molecule, and the residues bonded to the carboxyl group or the anhydride carboxyl group are C1 to C2. saturated or unsaturated aliphatic hydrocarbon groups. The aliphatic hydrocarbon group may be either linear or branched. As the polybasic acid component, in particular, the following general formula (V): HOOCCm H2mCOOH

(V) (m is an integer of 1 to 7), such as saturated aliphatic dibasic acids such as malonic acid, succinic acid, glutaric acid, adipic acid, and suberic acid, and their anhydrides (such as anhydrous succinic acid, etc.), the following general formula (V
I): HOOCCp H2p-2COOH

(VI) (p represents an integer from 1 to 7.)
Unsaturated aliphatic dibasic acids such as fumaric acid, itaconic acid, etc. and their anhydrides (e.g. maleic anhydride, etc.), and e.g. tetrahydrophthalic acid, hexahydrophthalic acid, 3-methylhexahydrophthalic acid,
Included are aliphatic dibasic acids such as 3-methyltetrahydrophthalic acid and their anhydrides.

The aliphatic carbon number of the polybasic acid is an integer of 1 to 7, preferably 1 to 4. If the number of carbon atoms exceeds 7, a coating with excellent hydrophilicity cannot be formed.

The hydroxyl group-containing nitrogen-containing polyester resin used in the present invention can be produced by subjecting the polyhydric alcohol component described above to an ester value reaction with a C1-7 aliphatic dibasic acid.

[0019] When the polyhydric alcohol component and the dibasic acid component are subjected to an esterification reaction, the blending ratio of both components is approximately 15 to 8 in the total amount of both components.
5% by weight, preferably about 20-75% by weight, dibasic acid component about 15-85% by weight, preferably about 25-80% by weight
range is suitable. The proportion of the polyhydric alcohol component is greater than about 85% by weight, and the proportion of the dibasic acid component is about 1% by weight.
If it is less than 5% by weight, water resistance, corrosion resistance, etc. will decrease, and on the other hand, if the proportion of polyhydric alcohol component is less than about 15% by weight,
If the proportion of the dibasic acid component exceeds about 85% by weight, hydrophilicity etc. will decrease, which is not preferable. The blending ratio of alcohol amine and mono- or polyether diol in the polyhydric alcohol component is about 2 to 40% by weight, preferably about 3 to 30% by weight of alkanolamine, and about 3 to 30% by weight of mono- or polyether diol, based on the total amount of both components. A range of 60-98% by weight, preferably about 70-97% by weight is suitable. If the proportion of alkanolamine is less than about 2% by weight and the proportion of mono- or polyether diol exceeds about 98% by weight, the hydrophilicity after immersion in running water will decrease, while on the other hand, if the proportion of alkanolamine is less than about 40% by weight, and the proportion of mono- or polyether diol is about 60% by weight.
If it is less than this, initial hydrophilicity etc. will decrease, which is not preferable.

In the hydroxyl group-containing nitrogen-containing polyester resin used in the composition of the present invention, as a polyhydric alcohol component,
Polyhydric alcohols other than the above-mentioned mono- or polyether diols can be blended as necessary. Examples of the other polyhydric alcohol components include ethylene glycol, propylene glycol, butanediol, neopentyl glycol, butylene glycol, pentanediol, dimethylpropanediol, hexanediol, hydrogenated bisphenol A, cyclohexanedimethanol, and trimethylene glycol. , tetramethylene glycol, hexamethylene glycol, trimethylolethane, trimethylolpropane, glycerin, diglycerin, dipentaerythritol, sorbitol, and the like.

[0021] When the other polyhydric alcohol component is used, the total proportion of the polyhydric alcohol component and the aliphatic dibasic acid is about 80% by weight or less, preferably about 70% by weight or less. . If the blending ratio exceeds about 80% by weight, the hydrophilicity of the coating will decrease, which is not preferable.

Further, in the hydroxyl group-containing nitrogen-containing polyester resin used in the composition of the present invention, as a polybasic acid component,
Other polybasic acids other than the C1-7 aliphatic dibasic acids may be blended as necessary. Examples of the other polybasic acid components include aliphatic saturated dibasic acids such as azelaic acid, sepacic acid, dodecynylsuccinic acid and anhydrides thereof, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, pyromellitic acid and Included are aromatic polybasic acids such as these anhydrides, methylcyclohexenetricarboxylic acid, het acid, tetrachlorophthalic acid, hexahydrotrimellitic acid, and alicyclic polybasic acids such as these anhydrides.

[0023] When the other polybasic acid component is used, the total proportion of the polyhydric alcohol component and the aliphatic dibasic acid is about 80% by weight or less, preferably about 70% by weight or less. . If the blending ratio exceeds about 80% by weight, the hydrophilicity of the coating will decrease, which is not preferable.

[0024] In the hydroxyl group-containing nitrogen-containing polyester resin used in the composition of the present invention, depending on the molecular weight adjustment and the required film performance, aromatic acids such as fatty oils and monobasic acids other than fatty acids, such as benzoic acid and P-tert benzoic acid, may be added. Group 1 basic acids can be blended. The aromatic monobasic acid is usually
The total proportion of the polyhydric alcohol component and the aliphatic dibasic acid is about 40% by weight or less. Also, 1
It is not preferable to use higher fatty oils or fatty acids of C8 or higher as the basic acid because the hydrophilicity of the coating film decreases.

The hydroxyl group-containing nitrogen-containing polyester resin is treated under the same conditions as ordinary polyester resins, for example, 150 to 2
It can be produced by reacting at 50°C for 1 to 15 hours.

The hydroxyl group-containing nitrogen-containing polyester resin used in the composition of the present invention suitably has a hydroxyl value in the range of about 30 to 250, preferably about 30 to 200. When the hydroxyl value is less than about 30, the crosslinking density of the coating decreases, making it difficult to obtain a hydrophilic coating with excellent durability;
If it is larger than 50, water resistance etc. will deteriorate, which is not preferable.

In addition, the hydroxyl group-containing nitrogen-containing polyester resin has a molecular weight of about 500 to 20
000, preferably in the range of about 1000 to 15000. Furthermore, the polyester resin may contain a carboxyl group if necessary, and the content thereof is preferably in the range of, for example, an acid value of about 300 or less.

The curing agent used in the composition of the present invention is for crosslinking and curing the hydroxyl group-containing nitrogen-containing polyester resin by heating, and is a functional group that crosslinks with the hydroxyl group in the polyester resin (for example, a hydroxyl group, It is a compound having an alkyl ether group, a blocked isocyanate group, etc.). Specifically, there are methylolated or alkyl etherified melamine resins modified with one or more selected from monohydric alcohols (having 1 to 5 carbon atoms), urea resins, pensoguanamine resins, and the like. The compound having a blocked isocyanate group is obtained by blocking the isocyanate group of an isocyanate compound with a blocking agent. Isocyanate compounds include tolylene diisocyanate, an adduct of tolylene diisocyanate and trimethylolpropane, diphenylmethane diisocyanate, methylene diisocyanate, hexamethylene diisocyanate, an adduct of hexamethylene diisocyanate and trimethylolpropane,
There are xylylene diisocyanate, lysine diisocyanate, etc. Blocking agents include phenol, thiourea, methanol, propanol, n-butanol, t-butanol, ethyl acetoacetate, dimethyl malonate, ε-
Examples include caprolactam.

The composition of the present invention has the above-mentioned hydroxyl group-containing nitrogen-containing polyester resin and a curing agent as main components, and the composition ratio of these two components is determined based on the total amount of both components. Polyester resin 97-60% by weight, especially 95-70% by weight, curing agent 3-40% by weight, especially 5-3%
0% by weight is preferred.

The composition of the present invention is a liquid composition using an organic solvent and/or water as a solvent or dispersion medium.

[0031] Furthermore, the hydroxyl group-containing nitrogen-containing polyester resin used in the composition of the present invention has excellent solubility in water even if it does not contain carboxyl groups, so it can be used as an aqueous composition using water as the main solvent. Can be used. Furthermore, the resin can be easily dissolved or dispersed in water even if it does not contain a carboxyl group.

[0032] In the composition of the present invention, it is preferable to use an aqueous composition in which a hydroxyl group-containing nitrogen-containing polyester resin and a curing agent dissolved in an organic solvent are dispersed in water, particularly from the viewpoint of production, environmental protection, and safety. is preferred.

The above-mentioned organic solvent may be one that dissolves the hydroxyl group-containing nitrogen-containing polyester resin and the curing agent and is substantially inert to these components, such as toluene, xylene, naphtha, mineral spirit, octane, and cyclohexane. Hydrocarbons, alcohols such as methanol, ethanol, butanol, cyclohexanol, and heptanol, dioxane, methyl cellosolve, butyl cellosolve, and methyl carbitol can be used.

The composition of the present invention may contain an antibacterial agent if necessary, and the antibacterial agent must satisfy the following conditions. (1) Low toxicity and high safety; (2)
) Stable against heat, light, acids, alkalis, etc., poorly soluble in water, and highly durable;
(3) It has bactericidal properties or the ability to inhibit the growth of bacteria at low concentrations; (4) It does not reduce its efficacy even when incorporated into a composition, and it does not impair the safety of the composition. (5) The hydrophilicity of the coating formed on the fin surface and the corrosion resistance of the fin should not be impaired.

Antibacterial agents that meet these conditions are known aliphatic and aromatic organic and inorganic compounds. For example, 2-(4-thiazolyl)-benzimidazole, n-(fluorodichloromethylthio)phthalimide, N-dimethyl-N'-phenol-N'-(fluorodichloromethylthio)-sulfamide, o-phenylphenol, 10,10' -oxybisphenoxyarsine, zinc pyrithione, 2,3,5,6-tetrachloro-4-(methylsulfonyl)pyridine, 2,4,5,
6-tetrachloroisophthalonitrile, diiodomethyl-p-tolylsulfone, methyl 2-benzimidazolecarbamate, bis(dimethylthiocarbamoyl)disulfide, N-(trichloromethylthio)-4-cyclohexene 1,2-dicarboximide and Barium metaborate, copper borate, zinc borate, zinc-copper-silver-
A typical example is zeolite. These antibacterial agents can be used alone or in combination.

The blending ratio of the antibacterial agent is preferably in the range of 1 to 30% by weight, more preferably 5 to 20% by weight, based on the total weight of the hydroxyl group-containing nitrogen-containing polyester resin. When the blending amount exceeds 30% by weight, the safety and film-forming properties of the composition tend to be impaired, and the hydrophilicity of the resulting film and the corrosion resistance of the material tend to be impaired.

The composition of the present invention may further contain known surfactants, antifoaming agents, etc., if necessary.

In the hydrophilic treatment method of the present invention, the composition thus obtained is used as a hydrophilic treatment agent for aluminum fins, and the concentration is appropriately adjusted. This is done by applying paint or the like to the fins or molded heat exchanger fins and letting it dry.

In the method of the present invention, a practical hydrophilic film can be formed even if the composition of the present invention is applied to untreated fin materials that have only been degreased and washed; From the viewpoint of corrosion resistance, etc., it is preferable to apply the composition of the present invention to the fin after subjecting the fin to a conventionally known surface treatment for aluminum, such as phosphoric acid chromate treatment or chromate chromate treatment, to form a hydrophilic coating. .

The thickness of the hydrophilic film obtained by the method of the present invention is preferably in the range of 0.2 to 5 μm, more preferably 0.5 to 3 μm. If the film thickness is less than 0.2 μm, the sustainability of hydrophilicity may not be sufficient, and if it exceeds 5 μm, the heat dissipation efficiency of the fins may decrease.

The composition of the present invention is particularly suitable for dip coating, and in such dip coating, a bath in which the solid content concentration of the processing agent is usually adjusted to a range of 2 to 10% by weight is used. Then dip-paint the fins. Dip-coated fins are typically preformed and assembled heat exchanger aluminum fins that are dipped into a bath, pulled out, and then painted.
Appropriate baking conditions, such as 120-200℃ and 10-30℃
A hydrophilic coating having the above-mentioned coating thickness can be obtained by baking for a minute.

The composition of the present invention can also be used as a coating agent for preventing dew condensation and snow and ice build-up on plastic films, molded products, ceramic molded products, and other molded objects such as buildings and vessels.

[0043]

[Operation and Effects of the Invention] The hydroxyl group-containing nitrogen-containing polyester resin used in the present invention is a compound in which alkanolamine, which is a polyhydric alcohol component, has at least two hydroxyl groups in one molecule, and the hydroxyl groups are dibasic acid It is esterified with other components, and the nitrogen atoms contained therein are present in the main chain of the polyester resin, which is thought to impart hydrophilicity to the coating. In addition, a nitrogen-containing element is present in the side chain of the resin. For example, some products are obtained by post-adding a hydroxylamine compound to a polyester resin, but although this improves the initial hydrophilicity of the coating, the sustainability of the hydrophilicity decreases due to a large amount of water elution. The crosslinkability with melamine resin also decreases. As described above, since the polyester resin used in the present invention contains nitrogen atoms in the main chain, a film can be formed with excellent sustainability of hydrophilicity and excellent crosslinkability with the melamine resin.

[0044] Mono- or polyether diol, which is the other polyhydric alcohol component, is a compound having an ether bond in the molecule and a hydroxyl group at both ends, and the hydroxyl group is esterified with a dibasic acid component. The ether bonds contained therein form the main chain of the polyester resin. Therefore, the hydrophilicity of the entire coating is improved, and since the ether bonds are chemically stable and are not hydrolyzed at all, the hydrophilicity of the coating can be maintained for a long period of time.

The aluminum fin material formed by the treatment method using the composition of the present invention has improved hydrophilicity (full surface water wettability and contact angle with water of 30° or less) and continuous molding, which have been problems in the past. Excellent workability (mold wear resistance). Furthermore, by blending an anti-mold agent, it is possible to improve the anti-mold property and suppress odor generation while maintaining the above-mentioned performance.

[0046]

[Examples] Below are production examples, working examples, and comparative examples.
The present invention will be specifically explained.

Production Example 1 A mixture consisting of 41.5 parts by weight of triethylene glycol, 12.4 parts by weight of diethanolamine, 46.1 parts by weight of adipic acid and 3 parts by weight of xylene was heated in a nitrogen gas atmosphere with stirring to 160 - The reaction was carried out at 230° C. for about 8 hours to obtain a nitrogen-containing polyester resin used in the present invention. Regarding the resin, the hydroxyl value was 190, the acid value was 15, the polybasic acid/polyhydric alcohol (molar ratio) was 0.8, and the alkanolamine content was 12.4% by weight.

Production Example 2 Polyethylene glycol 400 (weight average molecular weight 400
), 6.1 parts by weight of triethanolamine, 28.1 parts by weight of tetrahydrophthalic anhydride, and 3 parts by weight of xylene were reacted in the same manner as in Production Example 1 above to obtain the compound used in the present invention. A nitrogen polyester resin was created. Regarding the resin, the hydroxyl value is 82.3, the acid value is 35, polybasic acid component/polyhydric alcohol component (molar ratio)
was 0.9, and the alkanolamine content was 2.2% by weight.

Production Example 3 10.8 parts by weight of ethylene glycol, 52.7 parts by weight of polyethylene glycol 600 (weight average molecular weight 600), 6.6 parts by weight of methylmonoethanolamine, 29.9 parts by weight of succinic anhydride, and 3 parts by weight of xylene. A mixture consisting of parts by weight was reacted in the same manner as in Production Example 1 to prepare a nitrogen-containing polyester resin used in the present invention. Regarding the resin, the hydroxyl value was 144.5, the acid value was 30, the polybasic acid component/polyhydric alcohol component (molar ratio) was 0.85, and the alkanolamine content was 6.6% by weight.

Production Example 4 33.5 parts by weight of neopentyl glycol, 11.9 parts by weight of triethanolamine, 5 parts by weight of tetrahydrophthalic anhydride
A mixture consisting of 4.6 parts by weight and 3 parts by weight of xylene was reacted in the same manner as in Production Example 1 to prepare a polyester resin for comparative example.

Production Example 5 Neopentyl glycol 35.1 parts by weight, glycerin 7
．． A mixture consisting of 7 parts by weight, 57.2 parts by weight of tetrahydrophthalic anhydride, and 3 parts by weight of xylene was reacted under the same conditions as in Production Example 1 to prepare a polyester resin for comparative example.

Example 1 70 parts by weight (solid content) of the polyester resin obtained in Production Example 1
A mixture of 30 parts by weight (solid content) of "Beccamin N" (manufactured by Dainippon Ink & Chemicals, Ltd., water-soluble urea resin liquid) was diluted with water to obtain a hydrophilic treatment composition with a solid content of 7%.

Next, an aluminum plate (A1050, plate thickness 0.1 mm) was degreased with an alkaline degreaser (manufactured by Nippon CB Chemical Co., Ltd., trade name "Chem Cleaner 561B"), and then a chromate treatment agent (Nippon Parkerizing Co., Ltd.) was used.
Co., Ltd., trade name "Alchrom 713") was used for chromate treatment (chromium equivalent coating amount: 50 mg/m2), and using this as the object to be coated, the above-mentioned hydrophilic treatment composition was applied to a dry film of 1 μm. Then, it was baked at 160° C. for 30 minutes to form a hydrophilic treated film.

The resulting hydrophilized plate was tested for hydrophilicity, corrosion resistance, antibacterial properties, etc. The test results are shown in Table-2.

Examples 2 to 4 and Comparative Examples 1 to 2 A hydrophilic treatment composition with a solid content of 7% was obtained in the same manner as in Example 1 except that the formulations shown in Table 1 were used. A hydrophilic treatment film was formed in the same manner. In addition, the compounding amounts in Table 1 are as follows:
It is a solid content display.

The obtained hydrophilic treated plate was subjected to the same test as in Example 1, and the test results are shown in Table 2.

[0057]

[Table-1]

[0058] The test method shown in Table 2 was carried out using the following method. (*1) Water wettability: After applying press oil to the treated plate, apply the treated plate to Triclean (manufactured by Toagosei Kagaku Co., Ltd., product name:
The water on the surface of the treated board when the board was degreased for 5 minutes with steam from TriClen-S) was immersed in running tap water (water flow rate: 15 kg/hour per 1 square meter of treated board) for 500 hours, and then pulled out. Visually determine the wetness of the A state in which the entire surface was wet with water was evaluated as good (○). The water-repellent condition was rated as poor (x). (*2) Contact angle: The contact angle between the treated plate and water is measured using a contact angle meter DCAA model manufactured by Kyowa Kagaku Co., Ltd. after drying the treated plate at 80° C. for 5 minutes. (*3) Corrosion resistance: Based on JIS-Z-2371 salt spray test method. The test time was 500 hours. A case where no white rust or blistering occurred was rated as good (○). (*4) Antibacterial property: According to JIS-Z-2911. A mixed spore suspension of the following test bacteria was sprayed onto each treated plate, and the plate was allowed to stand at a temperature of 27°C for 28 days, after which the degree of mold growth on the treated membrane surface was visually observed. A film in which no mold was generated or attached on the surface of the treated film was rated as good (○). Those with mold growth or adhesion on the painted surface were rated as defective (×).

[Table 1]

[Table 2]

Claims (3)

[Claims] [Claim 1] An alkanolamine having at least two hydroxyl groups in one molecule and a mono- or polyether diol are used as the polyhydric alcohol component, and a C1-7 aliphatic dibasic acid is used as the polybasic acid component. A hydrophilic treatment composition comprising a hydroxyl group-containing nitrogen-containing polyester resin and a curing agent as a curable resin composition. 2. A hydrophilic treatment composition, characterized in that the composition according to claim 1 is blended with an antibacterial agent. 3. A hydrophilic treatment method comprising applying the composition according to claim 1 or 2 to aluminum heat exchanger fins.