JPH08291269A - Treating composition for making substance hydrophilic and parts for heat exchanger made hydrophilic - Google Patents

Abstract

PURPOSE: To obtain a treating composition for making substances hydrophilic which comprises a specific copolymer, a polyethylene glycol diglycidyl ether and an amine, and can form a coating layer having both hydrophilic and corrosion-resistant properties and showing no odor and good lubricity and is suitably useful in the surface treatment of fin materials in heat exchangers. CONSTITUTION: This composition comprises (A) a copolymer of a vinyl pyrrolidone with an acrylic acid and (B) a polyethylene glycol diglycidyl ether at a weight A/B ratio of 20/80-70/30 in the solid basis, and added with (C) an amine such as triethylamine, tripropylamine, triethanolamine, trimethanolamine or 1,4-diazabicyclo[2.2.2]octane in an amount of 0.05-1.0 pt.wt. per 100 pts.wt. of the components A and B in the solid basis.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for surface treatment of a metal material, particularly for hydrophilic treatment of the surface of a heat exchanger member made of aluminum or aluminum alloy (hereinafter, both are made of aluminum). And a heat exchanger member having the composition coated on the surface thereof. More specifically, the present invention, when used for the surface treatment of aluminum heat exchanger fins, hydrophilicity and corrosion resistance are good, and a hydrophilic treatment composition capable of forming a coating film without odor generation, and The present invention relates to a heat exchanger member having a surface coated with it.

Further, the present invention is capable of forming a coating film having a lubricating property such that it can be processed without using a lubricant when processing a metal material, particularly aluminum or an aluminum alloy, and uses a volatile press oil. The present invention also relates to a hydrophilic treatment composition capable of forming a film capable of obtaining sufficient lubricity and a heat exchanger member having the surface coated with the hydrophilic treatment composition.

[0003]

2. Description of the Related Art Aluminum and its alloys are widely used in heat exchangers because they are lightweight and have excellent workability and thermal conductivity. With the spread of air conditioning systems in recent years,
The number of air conditioners having both functions of dehumidifying and heating has increased, and aluminum alloy fins are generally used in the heat exchange section of these air conditioners.

During cooling operation of the air conditioner, water in the air adheres to the fin surface as condensed water. When the surface of the fins has low hydrophilicity, the condensed water becomes water droplets on the surface and adheres. However, the larger the volume of the water droplets attached to the fins, the greater the resistance of the air flowing between the fins. .
It increases the load on the fan motor for air circulation,
As a result, a large amount of electric energy is used. This leads to useless use of electric energy and leads to a reduction in heat exchange efficiency at the fins.

On the other hand, the aluminum or aluminum alloy used for the fin is originally excellent in corrosion resistance, but if condensed water is present on the surface of the fin for a long time, an oxygen concentration cell is formed or contaminants in the atmosphere are attached and concentrated. Will accelerate the corrosion reaction. This corrosion product is deposited on the surface of the fin and causes the heat exchange efficiency of the fin to decrease.

In order to improve the problems described above, various attempts have been made to form a coating film having both the two properties on the surface of the fin for the purpose of improving both hydrophilicity and corrosion resistance of the fin.

For example, in JP-A-54-57264, in order to impart hydrophilicity to the surface of the produced heat exchanger, the surface is treated with an aqueous solution containing a silicic acid compound,
A method of further treatment with an alkaline earth metal compound is described. The method of forming a silicic acid compound (water glass or the like) on the fin surface by this method is the most general,
This method is still used today. However, since water glass is used, contaminants are likely to adhere to the fin surface, and the contaminants are discharged during air conditioning operation, which may cause an offensive odor. In addition, after performing this treatment on the aluminum plate, when performing processing such as cutting and drilling in order to form the shape of the heat exchanger member such as fins, the surface treatment layer may be removed and the machining tool may not be worn. Many secondary problems such as increase have occurred.

Further, Japanese Patent Application Laid-Open No. 53-125437 proposes to coat a fin surface with a resin such as acrylic resin capable of forming a film and a metal oxide insoluble in water. According to this method, since the substance to be applied is mainly an organic polymer, problems such as tool wear during processing can be solved, but in general, an organic polymer is not always good in terms of hydrophilicity. Therefore, further improvement of hydrophilicity has become a new issue.

Japanese Unexamined Patent Publication No. 1-270977 discloses a method for hydrophilizing aluminum such as acrylamide and 2
Disclosed is a method of coating a mixture of sodium acrylamido-2-methylsulfonate, a chromic acid type post-treatment agent, and chromium fluoride trihydrate. However, it is not preferable to use a toxic chromic acid compound from the viewpoint of environmental protection.

Further, as a method of manufacturing a radiator fin using aluminum or an aluminum alloy, at present,
Precoating is progressing in which a coating material having a function such as hydrophilicity is applied in the state of aluminum strips before processing and then processed into a desired shape. It is expected that this pre-coated aluminum plate will not require painting, cleaning, etc. after being processed into a radiator and will lead to a reduction in processing steps. However, in order to press or punch a coated aluminum plate, steps such as press oil application, cleaning, and heat treatment are required.These steps require the use of a functional coating that has hydrophilic properties. Even a precoated aluminum plate has the adverse effect of degrading its properties. This causes the result that the hydrophilicity of the precoat, for example, is deteriorated by the application of the press oil and the dry heat treatment.

Further, it is necessary to wash the press oil used in the press working at the time of assembling the radiator, and Freon is often used for the washing. However, due to the recent regulation of CFCs, the use of CFCs in these processes needs to be reviewed.

With respect to the above problems, for example, Japanese Patent Laid-Open No. 3-252461 proposes to use a higher fatty acid lubricant as a lubricant. But,
Even if this higher fatty acid lubricant is used, the higher fatty acid is melted by the heating in the step of coating and baking on the aluminum plate, and a fatty acid film is uniformly formed on the surface of the coating film, An extreme decrease in hydrophilicity will occur.

[0013]

In the surface treatment method using each of the above coatings or treatment agents, the effects of hydrophilicity, odor control, corrosion resistance and lubricity cannot be sufficiently satisfied. As described above, in the conventional surface treatment technology, a film having sufficient hydrophilicity and corrosion resistance, good film strength, no odor, and good lubricity is formed on the aluminum heat exchanger material. Can not do it.

An object of the present invention is to form a hydrophilic coating on the surface of a fin material or the like of a heat exchanger, which has both hydrophilicity and corrosion resistance, does not generate odor, and has good lubricity during processing. It is to provide a surface treatment agent. Another object of the present invention is to provide a heat exchanger member having the surface treatment agent applied on its surface.

[0015]

Means for Solving the Problems As a result of intensive studies to achieve the above-mentioned object, the present inventors have found that (a) a copolymer of vinylpyrrolidone and acrylic acid, and (b) polyethylene glycol diester. By using a treating agent containing a composition containing glycidyl ether and further containing (c) an amine in water or a solvent containing water as a main component, hydrophilicity and corrosion resistance are good, and It has been found that a hydrophilic coating that does not generate odor can be formed on the surface of a heat exchanger member, for example, a metal such as an aluminum fin. The present invention has been completed based on this finding.

That is, according to the present invention, (1) (a) a copolymer of vinylpyrrolidone and acrylic acid and (b) polyethylene glycol diglycidyl ether are mixed in a mixing ratio of (a) to (b) in terms of solid content. The weight ratio of (a) /
(B) = 20/80 to 70/30,
0.05 to 1.0 of the amine (c) in terms of solid content based on 100 parts by weight of the total amount of the resin composed of (a) and (b)
A hydrophilic treatment composition, characterized by containing parts by weight,
(2) Further, (e) polystyrene sulfonic acid or a salt thereof is added to the resin (a) and (b) in a total amount of 100.
5 to 80 parts by weight in terms of solid content relative to parts by weight, the composition for hydrophilic treatment according to item (1),
(3) The amines (c) are at least one amine selected from triethylamine, trimethylamine, tripropylamine, triethanolamine, trimethanolamine, and 1,4-diazabicyclo [2,2,2] octane. (1) or the composition for hydrophilic treatment according to item (2), characterized in that (4) further comprises (f) polyethylene glycol (1),
The composition for hydrophilic treatment according to the item (2) or (3), (5)
Further, (d) a lubricant fine particle is contained, and the hydrophilic treatment composition according to (1), (2), (3) or (4), and (6) (1), (2) ), (3), (4)
Alternatively, the present invention provides a member for a heat exchanger, characterized in that the surface is coated with the composition for hydrophilic treatment according to the item (5).

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION In the composition for hydrophilic treatment of the present invention, the molecular weight of (a) a copolymer of vinylpyrrolidone and acrylic acid is preferably in the range of 5,000 to 300,000, and (b) polyethylene. The molecular weight of glycol diglycidyl ether is preferably in the range of 200 to 2000. First, each component used in the hydrophilic treatment composition of the present invention will be described.

(A) Copolymer of Vinylpyrrolidone and Acrylic Acid The copolymer of vinylpyrrolidone and acrylic acid used in the present invention is represented by the following general formula (I).

[0019]

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(In the formula, n represents an integer of 1 or more, and m represents an integer of 1 or more.) The vinylpyrrolidone-acrylic acid constituting the vinylpyrrolidone-acrylic acid copolymer represented by the general formula (I) The polymerization ratio does not necessarily have to be 1: 1; the molar ratio of vinylpyrrolidone to acrylic acid is 75/2.
The range is preferably 5 to 25/75, more preferably 40/60 to 30/70. When the amount of vinylpyrrolidone is higher than this composition ratio, the hydrophilicity is sufficiently exhibited, but the coating film is dissolved in water, so that the water resistance is significantly reduced. Further, when the amount of acrylic acid is larger than this composition ratio, the hydrophilicity is not sufficiently expressed when applied. Further, the copolymer of vinylpyrrolidone and acrylic acid may be a random copolymer of vinylpyrrolidone and acrylic acid, or a copolymer other than the random copolymer such as a block copolymer.

The vinylpyrrolidone-acrylic acid copolymer preferably has an average molecular weight of 5,000 to 300,000. When the molecular weight is less than this range, when a hydrophilic coating film is formed on the aluminum surface, sufficient water resistance may not be exhibited, and when the molecular weight exceeds this range, the hydrophilicity is sufficient. May not be expressed in.

When the vinylpyrrolidone-acrylic acid copolymer is dissolved in water, it does not dissolve in a neutral state, so it must be dissolved in a basic state. At this time, as those used to make water basic,
Ammonia is common, but other basic components can be used.

(B) Polyethylene glycol diglycidyl ether The polyethylene glycol diglycidyl ether used in the present invention is represented by the following general formula (II).

[0024]

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(In the formula, p represents an integer of 1 or more.) The polyethylene glycol diglycidyl ether represented by the general formula (II) has a molecular weight of 200 to 200.
It is preferably in the range of 0. When the molecular weight is less than this range, hydrophilicity is sufficiently expressed, but water resistance may be deteriorated. When the molecular weight exceeds this range, hydrophilicity may not be sufficiently expressed. It is believed that polyethylene glycol diglycidyl ether forms crosslinks in the coating film.

The amounts of the two resin components (a) and (b) described above are such that the blending ratio of these resin components is (a) a copolymer of vinylpyrrolidone and acrylic acid /
(B) Polyethylene glycol diglycidyl ether =
20/80 to 70/30 (solid content weight ratio), and preferably in the range of 40/60 to 60/40. If it is out of this range, it is not possible to expect sufficient expression of characteristics. More specifically, if the amount of copolymerization of vinylpyrrolidone and acrylic acid is too large, the hydrophilicity will deteriorate. On the other hand, if the amount of polyethylene glycol diglycidyl ether is too large, hydrophilicity will be sufficiently exhibited but water resistance will be a problem.

(C) Amines Next, the amine components used in the present invention include triethylamine, trimethylamine, tripropylamine, triethanolamine, trimethanolamine and 1,4-diazabicyclo [2,2,2]. ] Octane (DA
It is preferably at least one amine selected from BCO). DABCO can be used in either free form or quaternary ammonium salt form. This amine component acts as a reaction aid for reacting the above-mentioned (a) vinylpyrrolidone-acrylic acid copolymer and (b) polyethylene glycol diglycidyl ether. This amine component is the total amount of resin ((a)
The total amount of (b) and (b) is used in the range of 0.05 to 1.0 parts by weight, preferably 0.1 to 0.5 parts by weight, based on 100 parts by weight of the solid content. If the amount used is less than this range, the above-mentioned reaction does not proceed sufficiently and the water resistance becomes insufficient, and if it is added in excess of this amount, the reaction suddenly proceeds and a uniform surface is obtained. It becomes difficult to form a treatment film.

(E) Polystyrenesulfonic acid or its salt The polystyrenesulfonic acid or its salt used in the present invention is represented by the following general formula (III).

[0029]

Embedded image

(In the formula, q represents an integer of 1 or more, and R represents a hydrogen atom or an alkali metal.) The polystyrenesulfonic acid represented by the general formula (III) or a salt thereof has a molecular weight of 100,000 to 10,000.
It is preferably in the range of 00. When the molecular weight is less than this range, the hydrophilicity may not be sufficiently expressed, and when the molecular weight exceeds this range, the compatibility of (a) vinylpyrrolidone and a copolymer of acrylic acid is significantly deteriorated. Paintability may deteriorate. It may be a free acid or an alkali metal salt such as sodium or potassium, preferably a sodium salt. The addition amount of polystyrene sulfonic acid or a salt thereof is preferably 5 to 80 parts by weight, and more preferably 10 to 40 parts by weight, based on 100 parts by weight of the total amount of the resins (a) and (b). Is. If the amount added exceeds this range, the water resistance will deteriorate.
Further, if the addition amount is less than this, sufficient lubricity cannot be expected.

(D) Lubricant Fine Particles The lubricant fine particles used in the present invention are used as a lubricant when the treatment agent of the present invention is coated on an aluminum plate and the aluminum plate is further processed by press punching or the like. work. Due to the action of the lubricant fine particles, when the treatment agent of the present invention is used, sufficient lubricity can be obtained even if a volatile press oil is used, and in some cases, no press oil is required. Is also possible. In the present invention, the average particle size of the lubricant fine particles is preferably in the range of 0.1 to 5 μm, more preferably 0.5 to 3 μm. The lubricant fine particles have a melting point of 1 selected from polyolefin wax, aromatic bisamide, bisfatty acid amide, monofatty acid amide, and modified amide wax.
It is preferable that a lubricant having a temperature of 00 ° C. or higher is dispersed in water or a solvent mainly composed of water in the above particle size range. The amount of the lubricant fine particles added is preferably 1 to 60 parts by weight, and more preferably 3 to 30 parts by weight, based on 100 parts by weight of the total amount of the resins (a) and (b). If the amount added exceeds this range, the hydrophilicity, which is the first object of the present invention, will be reduced due to the hydrophobicity of the wax. Further, if the addition amount is less than this, sufficient lubricity cannot be expected.

The polyolefin wax referred to here is
For example, polyethylene wax, low molecular weight polypropylene wax, oxidized polyethylene wax and the like. Specific examples of the aromatic bisamide include N, N'-distearyl terephthalic acid amide and the like. Examples of the bis fatty acid amide include N, N′-distearyl adipic acid amide and RCONHCH ₂ CH
₂ A compound represented by NHCOR (R represents an alkyl group) and the like can be mentioned. As mono fatty acid amide,
For example, monostearic acid amide can be mentioned.
Further, specific examples of the modified amide wax include N-phenyl-N′-stearyl urea and the like.

These lubricant fine particles are used in a state of being dispersed in water or a solvent composed mainly of water. However, when the wax is dispersed in water, the melting point of these waxes is 100 ° C. or higher, and therefore the dispersion is not easy. However, dispersion can be easily performed by using a pressure cooker and a surfactant. The surfactant used in combination is preferably nonionic or anionic. This is because basic ammonia or the like is used when the (a) copolymer of vinylpyrrolidone and acrylic acid used as the main material is dissolved. The use of the cationic surfactant causes a problem that the properties of the dispersion liquid are largely changed and the life of the treating agent is shortened.

(F) Polyethylene glycol The polyethylene glycol used in the present invention functions as a lubricant when the treating agent of the present invention is applied on an aluminum plate and the aluminum plate is press-punched. The polyethylene glycol used in the present invention is represented by the following formula (IV).

[0035]

[Chemical 4]

(In the formula, r represents an integer of 1 or more.) The polyethylene glycol represented by the general formula (IV) preferably has a molecular weight in the range of 1,000 to 10,000. When the molecular weight is less than this range, sufficient lubricity may not be expected, and when the molecular weight exceeds this range, hydrophilicity may deteriorate. The amount of polyethylene glycol added is preferably 5 to 80 parts by weight, and more preferably 10 to 50 parts by weight, based on 100 parts by weight of the total amount of the resins (a) and (b). If the amount added exceeds this range, the water resistance may deteriorate. In addition, if the addition amount is less than this range, sufficient lubricity may not be expected.

In the hydrophilic treatment composition of the present invention,
In addition to the components (a) to (f), silica fine particles (g) and an amino or acrylic silane coupling agent (h) can be added. (G) Silica Fine Particles The silica fine particles preferably have an average particle diameter within the range of 0.1 to 5 μm, more preferably 0.5 to 3
μm. The silica fine particles, when added to the above-described two types of hydrophilic resin components (a) and (b), have the effect of further increasing the hydrophilicity. When the particle size of the silica fine particles exceeds the above range, the dispersed state of silica is deteriorated, and the treatment agent cannot be applied satisfactorily at the time of application, which is not preferable. On the other hand, when the amount is less than the above range, the hydrophilicity of the coating film is not well expressed. Although silica is defined by the expression of average particle size, many silica fine particles have a primary particle size of 100 μm or less, and a secondary particle size exists as a value within the specified range. These silicas can also be used when the secondary particle diameter falls within the above range. The amount of the silica fine particles added is preferably 3 to 40 parts by weight, more preferably 10 to 20 parts by weight, based on 100 parts by weight of the total amount of the resins used (the total amount of (a) and (b)). Is. Outside this range, hydrophilicity does not develop well.

(H) Amino or acrylic silane coupling agent When the silica fine particles (g) are used, an amino or acrylic silane coupling agent is used to anchor the silica fine particles in the coating film. it can. The amount of the amino or acrylic silane coupling agent added is
3-40 with respect to 100 parts by weight of silica fine particles added
It is preferably 10 parts by weight, more preferably 10 parts by weight.
30 parts by weight. This range, as reflected in the amount of silica to be added, considers the anchor effect of silica, and if the amount is too small, the silica anchor is not sufficient and only silica particles peel off from the coating surface. Will end up. In particular, when the amount of addition is too large, the hydrophobicity of the organic silane coupling agent compound is exhibited and the hydrophilicity after coating is severely deteriorated. Specific examples of these organic silane coupling agents include N- (β-aminoethyl) -γ-aminopropyltrimethoxysilane as an amino silane coupling agent, and acrylic silane coupling agents. , Γ-methacryloxypropyltrimethoxysilane and the like can be mentioned respectively.

In the hydrophilic treatment composition of the present invention,
In addition to the above components (a) to (h), an antibacterial agent can be added if necessary. Representative antibacterial agents include bis (2-pyridylthio) -zinc-1,1-dioxide and TBZ (thiabendazole). The amount of the antibacterial agent added is preferably 1 part by weight or more based on 100 parts by weight of the total solid content of the treating agent.

The hydrophilic treatment composition of the present invention is used as a treatment agent which is dissolved or dispersed in water or a water-based solvent. Here, the water-based solvent includes (a) water containing a basic component such as ammonia for dissolving the vinylpyrrolidone-acrylic acid copolymer in water, and (d) lubricant fine particles. In this case, it means water containing a surfactant for dispersing the lubricant fine particles in addition to the base component. Further, the concentration when the composition of the present invention is dissolved or dispersed in water or a solvent mainly composed of water is preferably 1 to 30% by weight in terms of the solid content concentration in the resulting treating agent, and 3 to It is more preferably 10% by weight.

The member for hydrophilization heat exchanger of the present invention is obtained by applying the above-mentioned treatment agent directly or through another treatment layer on aluminum or aluminum alloy formed into a thin plate shape or the like. To be Here, the other treated layer is a layer formed on aluminum or an aluminum alloy by a treatment with phosphoric acid chromate, chromate chromate, zircon, or the like, or an organic substance treatment for further improving the corrosion resistance as compared with the present invention. .

Commercial products of the above chromate treating agent include
For example, Alsurf 407/47 (trade name, manufactured by Nippon Paint Co., Ltd.) can be mentioned. In this chromate treatment,
The aluminum plate is first degreased and the amount of chromium is 5-30m
It is suitable to treat so as to obtain g / m ² .

When the surface of aluminum or aluminum alloy is coated with the treating agent, the following conditions are preferable. First, it is necessary to use a roll coater or the like to coat the treatment agent, and to coat the plate uniformly. Heat treatment after coating is performed at about 180 to 300 ° C for 15 to 90 ° C.
It is about a second. The coating film thickness at this time is 0.5 to 1.0 μ.
It is preferably m.

After a coating film containing the hydrophilic treatment composition of the present invention is formed on the surface by applying the treatment agent,
The aluminum or aluminum alloy plate is subjected to processing such as punching or bending into a shape such as fins, and is attached to, for example, a copper pipe to be molded as a heat exchanger.

[0045]

EXAMPLES Next, the present invention will be described in more detail based on examples, but the present invention is by no means limited to these.

The hydrophilicity, water resistance and odor of the aluminum plate on which the hydrophilic coating was formed were tested by the following methods. 1) Hydrophilicity The contact angle with pure water was determined and the hydrophilicity was evaluated. Each sample was immersed in tap water of 2 liters / minute for 8 hours and then dried at 80 ° C. for 16 hours. This cycle was defined as one cycle, and after repeating this cycle 5 times, the contact angle (°) with water was measured. The test No. Two
For samples 3 to 36, samples were volatile pressed oil (RF1
After dipping in 90), it was heated and degreased for 5 minutes in a drying oven at 180 ° C., and the above evaluation was performed. 2) Water resistance Each sample was immersed in tap water at 2 liter / min for 24 hours under running water, and the reduction rate (%) of the coating film at this time was measured. The evaluation is ◎: less than 10%, ◯: 10% or more and less than 30%, ×:
30% or more. 3) Odor Sensory test was conducted. The evaluation was ◯: no odor, ×: odor was present. 4) Lubricity 6mm for each sample of aluminum plate with hydrophilic coating
A φ high-speed draw forming test (processing speed 500 mm / min) was performed and evaluated according to the following criteria. The evaluation was made as follows: ◯: The sample was removed without mold galling, and X: Mold galling or cracking was generated in the sample by 10% or more of the total number of samples.

Synthetic Example Vinylpyrrolidone-acrylic acid copolymer (PVP-A
Preparation of C) In a 2 liter separable flask equipped with a stirrer, a condenser, a nitrogen introducing device, and a heating and cooling device, 111 g (1 mol) of vinylpyrrolidone monomer, 72 g (1 mol) of acrylic acid monomer, and benzene 18 as a solvent.
00 g was added, and stirring was started at room temperature in a nitrogen stream. After stirring for a few minutes, 2,2 'as a polymerization initiator
-0.2 grams of azobisisobutyronitrile diluted 100 times in benzene was added and stirring was continued. After stirring at room temperature for 1 hour, the temperature of the system was raised to 40 ° C. and reacted for 24 hours. After the reaction, the solvent was evaporated from the contents with a thin film evaporator to obtain 183 as a solid content of a copolymer of vinylpyrrolidone / acrylic acid = 50/50.
Got gram. The average molecular weight of this solid content was measured by gel permeation chromatography (GPC) and used in the following examples. The molecular weight of each copolymer used in the examples can be adjusted depending on the length of the reaction time. The vinylpyrrolidone / acrylic acid copolymer ratio can be adjusted by changing the monomer charging ratio. Further, this vinylpyrrolidone-acrylic acid copolymer is commercially available. In some of the test examples of the Examples, commercially available products were used in place of those synthesized above.

Example 1 Vinylpyrrolidone / acrylic acid copolymer (PVA-A
C), polyethylene glycol diglycidyl ether (PEG-DG), and an amine component were used to prepare a hydrophilic treatment composition (hydrophilic coating composition) with the composition shown in Table 1 below. This composition was dispersed in water so that the solid content concentration was 4 to 6% by weight to prepare a hydrophilic treatment agent. After degreasing the aluminum plate with alkali, it was treated with phosphoric acid chromate to form a corrosion resistant coating having a chromium content of about 10 to 20 mg / m ² . The above-prepared treating agent was applied onto this aluminum plate using a bar coater, and then 2
Baking was carried out at 40 ° C. for 30 seconds to obtain a hydrophilic coating film having a thickness of 1 μm on an aluminum plate. Each of the aluminum plates having the hydrophilic coating film obtained above was tested for hydrophilicity, water resistance and odor by the methods described above.

[0049]

[Table 1]

Example 2 Vinylpyrrolidone / acrylic acid copolymer (PVA-A
C), polyethylene glycol diglycidyl ether (PEG-DG), amine, silica particles, and an amino or acrylic silane coupling agent were used to prepare a composition having the composition shown in Table 2 below. In the composition shown in Table 2, the addition amount of the amino or acrylic silane coupling agent is parts by weight with respect to 100 parts by weight of the addition amount of the silica fine particles. This composition was dispersed in water, and the treating agent was adjusted so that the solid content concentration was 4 to 6% by weight. Using the obtained treating agent, treatment and evaluation were carried out in the same manner as in Example 1 above.

[0051]

[Table 2]

Example 3 Vinylpyrrolidone / acrylic acid copolymer (PVA-A
C), polyethylene glycol diglycidyl ether (PEG-DG), amine, and lubricant fine particles were used to prepare a composition having the composition shown in Table 3 below. As the lubricant fine particles, commercially available products were used by dispersing them in water. This composition was dispersed in water so that the solid content concentration was 4 to 6% by weight to prepare a treating agent. Using the obtained treating agent, treatment and evaluation were carried out in the same manner as in Example 1 above. The lubricity of the coating film was also evaluated.

[0053]

[Table 3]

Example 4 Vinylpyrrolidone / acrylic acid copolymer (PVA-A
C), polyethylene glycol diglycidyl ether (PEG-DG), amine, and sodium polystyrene sulfonate (PSSS) with the composition shown in Table 4 below, the composition for hydrophilic treatment (hydrophilic coating composition) )created. This composition was dispersed in water so that the solid content concentration was 4 to 6% by weight to prepare a treating agent. Using the obtained treating agent, treatment and evaluation were carried out in the same manner as in Example 1 above.
The lubricity of the coating film was also evaluated.

[0055]

[Table 4]

Example 5 Vinylpyrrolidone / acrylic acid copolymer (PVA-A
C), polyethylene glycol diglycidyl ether (PEG-DG), amine, sodium polystyrene sulfonate (PSSS), polyethylene glycol (PEG)
Using the lubricant fine particles, a composition was prepared with the composition shown in Table 5 below. As the lubricant fine particles, commercially available products were used by dispersing them in water. This composition was dispersed in water, and the treating agent was adjusted so that the solid content concentration was 4 to 6% by weight. Using the obtained treating agent, treatment and evaluation were carried out in the same manner as in Example 1 above. The lubricity of the coating film was also evaluated.

[0057]

[Table 5]

[0058]

The hydrophilic coating film obtained by treatment with the hydrophilic treatment agent of the present invention has good hydrophilicity and water resistance. Further, the odor is improved as compared with the commonly used inorganic hydrophilic treatment agents.
Also, by adding lubricant fine particles or polyethylene glycol, the coating film obtained by applying the treatment agent has good lubricity, and even if volatile press oil that does not need to be washed is used, it is sufficient for processing. Lubricity is obtained, and in some cases, processing can be performed without using a lubricant. Therefore, the hydrophilic treatment composition of the present invention is suitably used for treating a metal surface, particularly for treating an aluminum fin material for a heat exchanger. Further, the member for hydrophilic treatment heat exchanger of the present invention formed by applying the composition to the surface thereof, has a coating film having good hydrophilicity and water resistance on the surface, odor is also improved, These properties are not impaired during processing after the coating film is formed, and are suitable as a heat exchanger member.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location C09D 171/00 PLQ C09D 171/00 PLQ (72) Inventor Shunichi Fujimura 2-6 Marunouchi, Chiyoda-ku, Tokyo No. 1 inside Furukawa Electric Co., Ltd.

Claims (6)

[Claims] 1. A blending ratio of (a) a vinylpyrrolidone-acrylic acid copolymer and (b) polyethylene glycol diglycidyl ether (a) to (b) in terms of solid content of (a). / (B) = 20/80 to 70/3
0 to 100 parts by weight of the total amount of the resin (a) and (b), and the amine (c) is contained in an amount of 0.05 to 1.0 parts by weight in terms of solid content. A characteristic hydrophilizing composition. 2. Further, (e) polystyrene sulfonic acid or a salt thereof is contained in an amount of 5 to 80 parts by weight in terms of solid content based on 100 parts by weight of the total amount of the resin comprising (a) and (b). The composition for hydrophilic treatment according to claim 1, which is characterized in that. 3. The (c) amine is triethylamine,
The at least one amine selected from trimethylamine, tripropylamine, triethanolamine, trimethanolamine and 1,4-diazabicyclo [2,2,2] octane, according to claim 1 or 2. Hydrophilic treatment composition. 4. The hydrophilic treatment composition according to claim 1, further comprising (f) polyethylene glycol. 5. The hydrophilic treatment composition according to claim 1, further comprising (d) fine particles of a lubricant. 6. A heat exchanger member, characterized in that the surface is coated with the composition for hydrophilic treatment according to claim 1, 2, 3, 4 or 5.