JPH0977999A - Hydrophilic-film-forming coating agent and heat exchanger member coated therewith - Google Patents

Hydrophilic-film-forming coating agent and heat exchanger member coated therewith

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Publication number
JPH0977999A
JPH0977999A JP23574695A JP23574695A JPH0977999A JP H0977999 A JPH0977999 A JP H0977999A JP 23574695 A JP23574695 A JP 23574695A JP 23574695 A JP23574695 A JP 23574695A JP H0977999 A JPH0977999 A JP H0977999A
Authority
JP
Japan
Prior art keywords
coating
molecule
water
coating agent
polymer compound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP23574695A
Other languages
Japanese (ja)
Other versions
JP3158989B2 (en
Inventor
Naoya Fujiwara
直也 藤原
Tomoji Takahashi
知二 高橋
Kenichi Kamiya
憲一 神谷
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Priority to JP23574695A priority Critical patent/JP3158989B2/en
Publication of JPH0977999A publication Critical patent/JPH0977999A/en
Application granted granted Critical
Publication of JP3158989B2 publication Critical patent/JP3158989B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To obtain a hydrophilic-film-forming coating agent improved in hydrophilicity, water-film-forming properties, and prevention of water drop formation by using as the essential components a polymer compd. having an amide group is the molecule, a polymer compd. having an ether bond in the molecule, and a polymer compd. having at least two aldehyde groups in the molecule. SOLUTION: This agent comprises 0.5-5wt.% polymer compd. having an amide group, 1-10wt.% polymer having an ether bond in the molecule, 0.2-2wt.% polymer compd. having at least two aldehyde groups, if necessary 0.8-3.0wt.% water-sol. polymer compd. other than foregoing compds., 0.1-1.0wt.% surfactant, and the rest being water. The surface of a heat exchanger member is coated with the agent and baked.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、親水性の高い皮膜
を形成するための被覆剤、および該被覆剤で被覆するこ
とにより表面の親水性を高めた熱交換用部材に関するも
のであり、この発明は、例えば空調機等の熱交換器の放
熱板として用いられる熱交換器用AlまたはAl合金製
フィン材への水滴の付着を防止して水の流下を容易に
し、熱交換器の通風抵抗を低減するための皮膜形成剤と
して有効に活用することができるので、本明細書では熱
交換器用のフィン材表面に親水性皮膜を形成する場合を
主体にして説明するが、本発明はもとよりそれらの用途
に限定されるものではない。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating agent for forming a highly hydrophilic film, and a heat exchange member having a hydrophilic surface enhanced by coating with the coating agent. The invention, for example, prevents water droplets from adhering to a fin material made of Al or Al alloy for a heat exchanger used as a heat radiating plate of a heat exchanger such as an air conditioner, thereby facilitating the flow of water, thereby reducing ventilation resistance of the heat exchanger. Since it can be effectively utilized as a film-forming agent for reducing the amount, in the present specification, description will be made mainly on the case of forming a hydrophilic film on the surface of the fin material for the heat exchanger. The use is not limited.

【0002】[0002]

【従来の技術】空調機等に用いられる熱交換部材は、通
常0.1mm程度のAl合金製薄板をプレス成形したフ
ィン材に銅管などを差し込み、これを拡管して製造され
ものが多いが、このタイプの熱交換部材では、空調機の
運転時にフィンの表面温度が大気の露点以下となると、
空気中の水分の凝縮により生成する結露水が表面に付着
し、フィン間が該水滴によって封鎖され通風抵抗が増大
するいわゆる「ブリッジ現象」を引き起こし、熱交換効
率が低下したり或は付着水の飛散や騒音の発生とい問題
を招くことがしばしば経験されている。こうした問題
は、近年ますます進行する傾向の強い熱交換器の小型化
に伴うフィンピッチの狭隘化によって一段と顕著になる
傾向が見られる。こうした問題を解決するため、Al合
金製フィン材の表面に親水性を付与して水滴の付着を抑
え、フィン間のブリッジ現象を防ぐ方法が種々提案され
ている。
2. Description of the Related Art Most heat exchange members used in air conditioners and the like are manufactured by inserting a copper pipe or the like into a fin material obtained by press-molding an Al alloy thin plate of about 0.1 mm and expanding the same. , In this type of heat exchange member, when the surface temperature of the fin becomes below the dew point of the atmosphere during operation of the air conditioner,
Condensation water generated by condensation of water in the air adheres to the surface, causes a so-called "bridge phenomenon" in which fins are blocked by the water droplets and ventilation resistance increases, heat exchange efficiency decreases, or the adhered water It is often experienced that it causes problems such as scattering and noise generation. These problems tend to become more prominent due to the narrower fin pitch that accompanies the miniaturization of heat exchangers, which has become more and more intense in recent years. In order to solve such a problem, various methods have been proposed to impart hydrophilicity to the surface of an Al alloy fin material to suppress the adhesion of water droplets and prevent the bridge phenomenon between fins.

【0003】例えばAl合金製フィン材の表面に親水性
を付与する方法としては アルカリ珪酸塩(水ガラス)などの無機系化合物を用
いて親水化処理する方法(特開昭58−126989号
等)、 ポリビニルアルコールやセルロース系ポリマー、ポリ
アクリル酸系ポリマー等の親水性高分子化合物や界面活
性剤などを含有する被覆剤を塗布することにより、フィ
ン材表面に親水性を与えて水濡れ性を高める方法(特開
昭64−38481号等) が知られている。これらの表面処理により、水の接触角
で定量評価することのできるフィン材表面の親水性が高
められ、それに伴って、通風抵抗で定量評価することの
できる熱交換器の熱交換効率向上に寄与できることが確
認されており、こうした傾向は銅合金製の熱交換器用フ
ィン材にも共通する。
For example, as a method for imparting hydrophilicity to the surface of an Al alloy fin material, a method of making hydrophilic by using an inorganic compound such as alkali silicate (water glass) (Japanese Patent Laid-Open No. 58-126989) By applying a coating agent containing a hydrophilic polymer compound such as polyvinyl alcohol, cellulose-based polymer, polyacrylic acid-based polymer, or a surfactant, hydrophilicity is given to the fin material surface to improve water wettability Methods (Japanese Patent Laid-Open No. 64-38481, etc.) are known. By these surface treatments, the hydrophilicity of the fin material surface, which can be quantitatively evaluated by the contact angle of water, is enhanced, and accordingly, the heat exchange efficiency of the heat exchanger, which can be quantitatively evaluated by ventilation resistance, is improved. It has been confirmed that this is possible, and this tendency is common to fin materials for heat exchangers made of copper alloy.

【0004】[0004]

【発明が解決しようとする課題】ところが、上記の方
法により表面処理されたフィン材表面の親水性は改善さ
れるものの表面硬度が高くなり、熱交換器用フィン材を
製造する際のプレス加工性が低下するばかりでなく金型
摩耗も著しくなるという難点が生じてくる。しかも、該
親水性皮膜にはシリカ独特の臭気があるため、屋内に設
置される空調機に適用すると不快臭を生じるという難点
も指摘される。一方、上記の高分子樹脂皮膜で表面被
覆されたフィン材では、上記の様な加工性の低下や金型
摩耗、更には臭気発生といった問題を生じることはない
が、親水性樹脂や界面活性剤の流出により皮膜の親水性
が短時間のうちに低下するという問題がある。
However, although the hydrophilicity of the surface of the fin material surface-treated by the above method is improved, the surface hardness is increased and the press workability in manufacturing the fin material for the heat exchanger is improved. Not only does it decrease, but also die wear becomes significant, which is a problem. Moreover, since the hydrophilic film has an odor peculiar to silica, it is pointed out that when applied to an air conditioner installed indoors, an unpleasant odor is generated. On the other hand, the fin material surface-coated with the above polymer resin film does not cause the problems such as the above-mentioned deterioration of workability, die wear, and odor generation, but the hydrophilic resin and the surfactant. There is a problem that the hydrophilicity of the film is reduced in a short time due to the outflow of water.

【0005】そこで、被覆の表面積を増大させて見掛け
の親水性を高める方法が検討されている。被覆の表面積
を増大させる方法としては、無機質もしくは有機質の微
粒子を被覆剤中に含有させて被覆表面を粗面化する方
法、フィン材の表面にクレーターを形成したりショット
ブラスト処理によって表面を粗面化する方法なども試み
られている。しかしながら無機質微粒子を含有させる方
法では、一般に無機質微粒子が硬質であるため、プレス
成形型の摩耗が激しくなるという問題が再び問題とな
り、しかも、フィン材としての実用化時に該微粒子の剥
離・脱落が起こって被覆が破損したり、更にはフィン材
の腐食が進行するといった新たな問題が生じてくる。ま
た該微粒子は2次凝集を起こし易いため、表面積の増大
に有効な凹凸を被覆表面に効果的に形成することができ
ず、配合量に応じた表面粗面化効果も得られにくい。更
に、ショットブラスト法等によって被覆表面を粗面化す
る方法では、表面の耐食性皮膜までも傷つけるため、フ
ィン材としての耐食性を大幅に劣化させる。
Therefore, a method of increasing the surface area of the coating to increase the apparent hydrophilicity has been investigated. As a method for increasing the surface area of the coating, a method of roughening the coating surface by incorporating fine particles of inorganic or organic in the coating agent, forming a crater on the surface of the fin material or roughening the surface by shot blasting treatment The method of making it into something is also tried. However, in the method of containing the inorganic fine particles, since the inorganic fine particles are generally hard, the problem that the wear of the press mold becomes severe becomes a problem again, and further, the peeling and dropping of the fine particles occur at the time of practical application as a fin material. As a result, new problems such as damage to the coating and further progress of corrosion of the fin material occur. Further, since the fine particles easily cause secondary aggregation, it is not possible to effectively form irregularities effective for increasing the surface area on the coated surface, and it is difficult to obtain the surface roughening effect according to the blending amount. Further, in the method of roughening the coated surface by the shot blast method or the like, even the corrosion resistant film on the surface is damaged, so that the corrosion resistance as a fin material is significantly deteriorated.

【0006】本発明はこの様な従来技術の問題点に着目
してなされたものであって、その目的は、優れた親水性
を有し水膜形成を助長して水滴の付着を長期間にわたっ
て確実に阻止し、かつ被覆形成素材としての成形加工性
が良好で金型摩耗も少なく、更には耐食性等に悪影響を
及ぼすことのない、優れた性能の親水性皮膜を形成し得
る様な皮膜形成用被覆剤を提供しようとするものであ
り、ひいては、空調機等の熱交換器用フィン材として利
用することにより、水滴の付着を効果的に阻止して水の
流下を容易にし、通風抵抗の低減等に優れた特長を発揮
する、親水性の高められた熱交換器用部材を提供しよう
とするものである。
The present invention has been made by paying attention to the problems of the prior art as described above, and its purpose is to have an excellent hydrophilic property, to promote the formation of a water film, and to prevent the attachment of water drops for a long period of time. Forming a hydrophilic film that reliably blocks, has good moldability as a coating forming material, has little die wear, and does not adversely affect corrosion resistance, etc., and can form a hydrophilic film with excellent performance. By using it as a fin material for heat exchangers of air conditioners, etc., it effectively blocks the attachment of water droplets and facilitates the flow of water, reducing ventilation resistance. The present invention intends to provide a member for a heat exchanger which has excellent hydrophilicity and which has excellent hydrophilicity.

【0007】[0007]

【課題を解決するための手段】上記課題を解決すること
のできた本発明の親水性皮膜形成用被覆剤は、分子内に
アミド基を有する高分子化合物(a)と、分子内にエー
テル結合を有する高分子化合物(b)と、分子内に少な
くとも2個のアルデヒド基を有する化合物(c)とを必
須成分として含有する水性液からなるところにその特徴
を有している。
The hydrophilic film-forming coating material of the present invention, which has been able to solve the above-mentioned problems, has a polymer compound (a) having an amide group in the molecule and an ether bond in the molecule. The feature is that the polymer compound (b) has and the compound (c) having at least two aldehyde groups in the molecule as an essential component.

【0008】上記被覆剤の必須構成成分となる化合物
(a)〜(c)の中でも、分子内にアミド基を有する高
分子化合物(a)としてはポリ(メタ)アクリルアミド
が、分子内にエーテル結合を有する高分子化合物(b)
としてはポリアルキレングリコールが、また分子内に少
なくとも2個のアルデヒド基を有する化合物(c)とし
てはグリオキザールが、夫々特に好ましいものとして挙
げられる。また、本発明被覆剤における上記各化合物
(a)〜(c)の好ましい含有率は、 分子内にアミド基を有する高分子化合物(a): 0.5〜
5%、 分子内にエーテル結合を有する高分子化合物(b):1
〜10%、 分子内に少なくとも2個のアルデヒド基を有する化合物
(c): 0.2〜2% より好ましくは 分子内にアミド基を有する高分子化合物(a): 1.5〜
3.5%、 分子内にエーテル結合を有する高分子化合物(b):3
〜 6.0%、 分子内に少なくとも2個のアルデヒド基を有する化合物
(c): 0.4〜1.0 % の範囲である。
Among the compounds (a) to (c) which are essential constituents of the coating agent, poly (meth) acrylamide is a polymer compound (a) having an amide group in the molecule and ether bond in the molecule. Polymer compound (b) having
Particularly preferable examples thereof include polyalkylene glycols, and glioxal as the compound (c) having at least two aldehyde groups in the molecule is particularly preferable. The preferred content of each of the compounds (a) to (c) in the coating agent of the present invention is as follows: Polymer compound (a) having an amide group in the molecule: 0.5 to
5%, a polymer compound having an ether bond in the molecule (b): 1
-10%, compound (c) having at least two aldehyde groups in the molecule: 0.2-2%, more preferably polymer compound (a) having amide group in the molecule: 1.5-
3.5%, polymer compound having ether bond in the molecule (b): 3
˜6.0%, compound (c) having at least two aldehyde groups in the molecule: 0.4 to 1.0%.

【0009】本発明の被覆剤は、必要により他の成分と
して、上記成分(a)〜(c)以外の水溶性高分子化合
物、たとえばカルボキシメチルセルロースやポリビニル
アルコール等を適量含有させ、あるいは適量の界面活性
剤を含有させることによって、塗装・焼付けによって形
成される被覆の粗面度および親水性を一段と高めること
ができるので好ましい。ここで、必要により含有させる
ことのできる水溶性高分子化合物の好ましい配合量は
0.8〜3.0重量%、より好ましくは1.2〜2.0
重量%、界面活性剤の好ましい配合量は0.1〜1.0
重量%の範囲である。
The coating composition of the present invention may contain, if necessary, a water-soluble polymer compound other than the above-mentioned components (a) to (c), such as carboxymethyl cellulose or polyvinyl alcohol, as an optional component, or an appropriate amount of interface. The inclusion of an activator is preferable because the surface roughness and hydrophilicity of the coating formed by painting and baking can be further enhanced. Here, the preferable blending amount of the water-soluble polymer compound which can be contained if necessary is 0.8 to 3.0% by weight, and more preferably 1.2 to 2.0.
% By weight, preferably 0.1 to 1.0
It is in the range of% by weight.

【0010】また、本発明に係る熱交換用部材とは、上
記の親水性皮膜形成用被覆剤を熱交換部材の表面に塗布
し焼付け被覆することによって表面の親水性を高め、表
面の水膜形成能を高めて水滴としての付着を防止し、熱
交換効率などを高めたところに特徴を有するものであ
り、たとえば被覆基材となる熱交換部材としてAlもし
くはAl合金製の熱交換器用フィン材に適用することに
より、優れた性能のフィン材を得ることができる。
Further, the heat exchange member according to the present invention means that the hydrophilic film forming coating agent is applied to the surface of the heat exchange member and baked to increase the hydrophilicity of the surface, thereby forming a water film on the surface. It is characterized in that the forming ability is enhanced to prevent adhesion as water droplets and the heat exchange efficiency is enhanced. For example, a fin material for a heat exchanger made of Al or an Al alloy as a heat exchange member serving as a coating base material. When applied to, a fin material having excellent performance can be obtained.

【0011】尚、上記被覆剤を熱交換部材の表面に塗布
し焼付け被覆することによって形成される被覆は、追っ
て詳述する如く表面に微細凹凸を無数に有する粗面度の
高い被覆となるが、該被覆の好ましい表面性状として
は、直径0.1〜3.0μmの粒状突起物が、表面に、
独立して、或は互いに接触もしくは連結して多数存在す
るものであり、前記被覆剤を使用すると、この様な表面
性状の被覆を容易に形成することが可能となる。
The coating formed by coating the surface of the heat exchanging member with the above coating and baking it is a coating having a large number of fine irregularities on the surface, which will be described later in detail. As a preferable surface texture of the coating, granular projections having a diameter of 0.1 to 3.0 μm are formed on the surface,
A large number of them exist independently or in contact with each other or connected to each other. By using the above-mentioned coating agent, it becomes possible to easily form a coating having such a surface texture.

【0012】[0012]

【発明の実施の形態】前述の如く本発明に係る親水性皮
膜形成用被覆剤は、分子内にアミド基を有する高分子化
合物[以下、アミド基含有高分子ということがある]
(a)と、分子内にエーテル結合を有する高分子化合物
[以下、エーテル含有高分子ということがある](b)
と、分子内に少なくとも2個のアルデヒド基を有する化
合物[以下、アルデヒド基含有化合物ということがあ
る](c)とを必須成分として含有する水性液からなる
ものであり、これらを好ましい比率で含有する水性液を
熱交換用部材の表面に塗布し焼付け処理すると、表面に
微細凹凸を無数に有する粗面度の高い親水性被覆が形成
されるが、この被覆は、その高い粗面度によってもたら
される表面積拡大と当該被覆自体の高い親水性が有効に
作用し、該被覆表面に凝集付着した結露水などは速やか
に水膜を形成して下方に流下することになり、水滴状態
での滞留が阻止される結果、従来の熱交換器用フィン材
等に見られる結露水の付着滞留による熱交換器の性能低
下、結露水の飛散、騒音の発生といった問題を悉く解消
することが可能となる。
BEST MODE FOR CARRYING OUT THE INVENTION As described above, the coating material for forming a hydrophilic film according to the present invention is a polymer compound having an amide group in the molecule [hereinafter, may be referred to as an amide group-containing polymer].
(A) and a polymer compound having an ether bond in the molecule [hereinafter, sometimes referred to as ether-containing polymer] (b)
And a compound having at least two aldehyde groups in the molecule [hereinafter, sometimes referred to as an aldehyde group-containing compound] (c) as an essential liquid, and containing them in a preferable ratio. When an aqueous liquid that applies to the surface of the heat exchange member is applied and baked, a hydrophilic coating with a high degree of roughness having numerous fine irregularities on the surface is formed, and this coating is brought about by the high degree of roughness. The surface area expansion and the high hydrophilicity of the coating itself effectively act, and the condensed water and the like coagulating and adhering to the coating surface immediately form a water film and flow down, so that the retention in the water droplet state is prevented. As a result of the prevention, it is possible to eliminate problems such as performance deterioration of the heat exchanger due to adhesion and retention of dew condensation water, scattering of dew condensation water, and generation of noise that are found in conventional fin materials for heat exchangers. .

【0013】以下、本発明に係る親水性皮膜形成用被覆
剤の構成を詳細に説明すると共に、該被覆剤を塗布・焼
付けすることによって形成される被覆の表面性状などを
主体にして説明を進める。
The constitution of the coating agent for forming a hydrophilic film according to the present invention will be described in detail below, and the description will proceed mainly with respect to the surface properties of the coating formed by applying and baking the coating agent. .

【0014】被覆剤の必須成分として規定されるアミド
基含有高分子(a)とは、例えばポリ(メタ)アクリル
アミドやアミノポリ(メタ)アクリルアミドの如く、分
子中にアミド基を有する水溶性の高分子化合物であり、
この高分子(a)は、塗布・焼付け処理によって後述す
るアルデヒド基含有化合物(c)と架橋反応し、親水性
でしかも水には溶出しない被覆成分を構成する。しかも
この架橋反応物は、エーテル含有高分子(b)等との共
存系では非常に高い凝結力を示し、焼付け被覆の表面に
該架橋反応物が、独立して、或は互いに接触もしくは連
結して多数の粒状突起物を形成し、被覆の表面積拡大に
寄与する。また、一般に市販されているアミド基含有高
分子の中には、分子内にカルボキシル基を有するものが
あり、該カルボキシル基は、エーテル含有高分子(b)
中のエーテル結合と会合し、被覆層中で上記架橋反応物
の言わばマトリックス(分散層)として存在するエーテ
ル含有高分子(b)とも物理的に結合し、該高分子
(b)の水への溶出を抑えると共に、被覆全体としての
耐久性を高める作用も発揮するものと考えられる。
The amide group-containing polymer (a) defined as an essential component of the coating agent is a water-soluble polymer having an amide group in the molecule, such as poly (meth) acrylamide or aminopoly (meth) acrylamide. Is a compound,
The polymer (a) cross-links with the aldehyde group-containing compound (c) described below by coating and baking treatment, and constitutes a coating component which is hydrophilic and does not dissolve in water. Moreover, this cross-linking reaction product exhibits a very high cohesive force in the coexistence system with the ether-containing polymer (b) and the like, and the cross-linking reaction product is independently or in contact with or connected to the surface of the baking coating. Form a large number of granular projections, which contributes to increase the surface area of the coating. Further, among commercially available amide group-containing polymers, there are those having a carboxyl group in the molecule, and the carboxyl group is an ether-containing polymer (b).
And the ether-containing polymer (b) existing as a matrix (dispersion layer) of the above-mentioned cross-linking reaction product in the coating layer. It is considered that the action of suppressing elution and enhancing the durability of the entire coating is exerted.

【0015】こうした作用が最も有効に発揮されるの
は、分子中に1級アミド基を有するポリ(メタ)アクリ
ルアミドであるが、要は分子中にアルデヒド基との反応
性を有するアミド基を有し且つ水溶性であるものであれ
ばこれに限定されず、(メタ)アクリルアミドを重合成
分として含有する様々の水溶性共重合体やそれらの各種
変性物(たとえば、アニオン変性やカチオン変性などを
含む)等を使用することも可能である。更には、分子中
に2級アミド基からなるポリアミド結合を有する水溶性
ポリアミド化合物も有効に活用することができる。
It is the poly (meth) acrylamide having a primary amide group in the molecule that most effectively exhibits such an action, but the point is that the amide group having reactivity with an aldehyde group is present in the molecule. And is water-soluble, the present invention is not limited thereto, and various water-soluble copolymers containing (meth) acrylamide as a polymerization component and various modified products thereof (for example, anion-modified and cation-modified are included) ) Etc. can also be used. Furthermore, a water-soluble polyamide compound having a polyamide bond composed of a secondary amide group in the molecule can be effectively used.

【0016】ポリ(メタ)アクリルアミドを選択すると
きの好ましい分子量は、被覆形成能と塗工作業性等を加
味して数平均分子量で1万〜200万、より好ましくは
5万〜100万の範囲のものである。尚ポリ(メタ)ア
クリルアミドとしては、一般に市販されている未変性物
の他、アニオン系、カチオン系、ノニオン系のポリ(メ
タ)アクリルアミドが包含される。
The preferred molecular weight when poly (meth) acrylamide is selected is in the range of 10,000 to 2,000,000, more preferably 50,000 to 1,000,000 in terms of number average molecular weight in consideration of coating forming ability and coating workability. belongs to. Examples of the poly (meth) acrylamide include unmodified products that are generally commercially available, as well as anionic, cationic, and nonionic poly (meth) acrylamides.

【0017】該アミド基含有高分子(a)の被覆剤中に
占める好ましい含有量は0.5〜5.0重量%、より好
ましくは1.5〜3.5重量%の範囲であり、含有量が
不足する場合は、焼付け被覆の粗面度と親水性が十分に
上がりにくくなり、被覆の水膜形成能が不足気味とな
り、一方含有量が多過ぎると、架橋反応によって生成す
る微粒子が多くなりすぎて被覆の全面に多量の微粒子が
生成し、却って被覆表面の粗面度が低下してくる。
The content of the amide group-containing polymer (a) in the coating agent is preferably 0.5 to 5.0% by weight, more preferably 1.5 to 3.5% by weight. If the amount is insufficient, the surface roughness and hydrophilicity of the baked coating will not be sufficiently increased, and the water film forming ability of the coating will be insufficient, while if the content is too large, many fine particles will be generated by the crosslinking reaction. If it becomes too much, a large amount of fine particles will be generated on the entire surface of the coating, and on the contrary, the roughness of the coating surface will decrease.

【0018】次にエーテル含有高分子(b)は、上記の
様に焼付け被覆中に生成する架橋反応物のマトリックス
成分となる成分であり、市販されているポリ(メタ)ア
クリルアミド等に若干量含まれているカルボキシル基と
水素結合による会合体を形成し、水に非溶出性の親水耐
久性に優れた被覆を形成するうえで欠くことのできない
ものである。好ましいものとしては、親水性に加えて塗
膜潤滑性を高めフィン材等としての成形性を高める作用
も備えたポリアルキレングリコール(例えばポリエチレ
ングリコール、ポリジオキソラン、ポリエチレングリコ
ールとポリプロピレングリコールのブロック或はランダ
ム共重合体など)が挙げられるが、要は分子中にエーテ
ル結合を有する水溶性の高分子化合物であれば、他の様
々のエーテル含有高分子化合物を使用することができ
る。
Next, the ether-containing polymer (b) is a component serving as a matrix component of the cross-linking reaction product produced during baking as described above, and is contained in a small amount in commercially available poly (meth) acrylamide or the like. It is indispensable for forming an associated body by hydrogen bond with the existing carboxyl group to form a non-eluting coating having excellent hydrophilic durability in water. Preferred are polyalkylene glycols (eg, polyethylene glycol, polydioxolane, polyethylene glycol and polypropylene glycol block or random) which have hydrophilicity and also have the effect of enhancing the lubricity of the coating film and the moldability of fin materials. Other examples include various other ether-containing polymer compounds as long as they are water-soluble polymer compounds having an ether bond in the molecule.

【0019】エーテル含有高分子(b)としてポリアル
キレングリコールを使用するときの該グリコールの好ま
しい分子量は2,000〜200,000、より好まし
くは6,000〜100,000の範囲であるが、被覆
剤としての塗工作業性等を高めるため、より低分子量の
ポリアルキレングリコールを少量併用することも有効で
ある。また、該エーテル含有高分子(b)の好ましい含
有量は1.0〜10.0重量%、より好ましくは3.0
〜6.0重量%の範囲であり、含有量が不足する場合は
被覆形成能が不足気味となり、逆に多過ぎる場合は被覆
剤の粘度が高くなりすぎて塗工性が悪くなる傾向が現わ
れてくる。
When a polyalkylene glycol is used as the ether-containing polymer (b), the preferred molecular weight of the glycol is in the range of 2,000 to 200,000, more preferably 6,000 to 100,000. In order to improve coating workability as an agent, it is also effective to use a small amount of a lower molecular weight polyalkylene glycol in combination. The content of the ether-containing polymer (b) is preferably 1.0 to 10.0% by weight, more preferably 3.0.
When the content is insufficient, the coating-forming ability tends to be insufficient. On the contrary, when the content is too large, the viscosity of the coating agent tends to be too high and the coating property tends to be poor. Come on.

【0020】アルデヒド基含有化合物(c)は、前述の
如くアミド基含有高分子(a)中のアミド基と架橋反応
を起こし、微細凹凸源となる親水性の粒状微粒子を形成
するうえで必須の成分であり、架橋剤としての作用が最
も有効に発揮されるのはグリオキザールであるが、この
他こはく酸ジアルデヒド、ジアルデヒド澱粉等を使用す
ることも可能でありる。
The aldehyde group-containing compound (c) is essential for forming a hydrophilic granular fine particle which becomes a source of fine unevenness by causing a crosslinking reaction with the amide group in the amide group-containing polymer (a) as described above. Glyoxal is the component that most effectively exhibits the action as a cross-linking agent, but it is also possible to use succinic acid dialdehyde, dialdehyde starch and the like.

【0021】該アルデヒド基含有化合物(c)の好まし
い含有量は0.2〜2.0重量%、より好ましくは0.
4〜1.0重量%の範囲であり、この範囲を外れると、
いずれの場合も被覆の親水性が低下したり粗面度が不十
分になる傾向が生じてくる。
The content of the aldehyde group-containing compound (c) is preferably 0.2 to 2.0% by weight, more preferably 0.
It is in the range of 4 to 1.0% by weight, and if out of this range,
In either case, the hydrophilicity of the coating tends to decrease or the roughness tends to become insufficient.

【0022】本発明被覆剤における必須の成分は上記3
成分であり、これらを水に混合・溶解することによって
被覆剤とされるが、このとき、更に他の成分として、前
記成分(a)〜(c)以外の水溶性高分子化合物や界面
活性剤を適量配合し、被覆性能を一段と高めることも有
効である。ここで用いられる水溶性高分子化合物として
は、カルボキシメチルセルローズ、メチルセルローズ、
ヒドロキシエチルセルローズ、ヒドロキシプロピルセル
ロース、ヒドロキシプロピルメチルセルロース、ポリビ
ニルアルコール、ポリ酢酸ビニルの部分けん化物、水溶
性ナイロン、ポリビニルピロリドン、ポリアクリルアミ
ドメチルプロパンスルホン酸等が例示されるが、これら
の中でも特に好ましいのはカルボキシメチルセルロース
である。そしてこれを0.8〜3.0重量%程度添加す
ると、造膜性が一段と向上すると共に焼付け被覆表面の
粗面度と親水性も一層高められる。但しその含有量が多
くなりすぎると、被覆剤としての粘度が高くなって塗工
性が低下したり、あるいは被覆剤の状態で固形物が生成
することがあるので注意しなければならない。
The essential components in the coating agent of the present invention are 3 above.
It is a component and is made into a coating agent by mixing and dissolving these in water. At this time, as other components, a water-soluble polymer compound other than the components (a) to (c) or a surfactant is used. It is also effective to further improve the coating performance by blending a suitable amount of. As the water-soluble polymer compound used here, carboxymethyl cellulose, methyl cellulose,
Hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxypropylmethyl cellulose, polyvinyl alcohol, partially saponified polyvinyl acetate, water-soluble nylon, polyvinylpyrrolidone, polyacrylamide methyl propane sulfonic acid and the like are exemplified, but among these, particularly preferred are Carboxymethyl cellulose. When this is added in an amount of about 0.8 to 3.0% by weight, the film-forming property is further improved and the surface roughness and hydrophilicity of the baked coating surface are further enhanced. However, it should be noted that if the content is too large, the viscosity as a coating material becomes high and the coatability may be lowered, or solid matter may be formed in the state of the coating material.

【0023】また、必要に応じて用いられる界面活性剤
は、焼付き被覆の親水性を更に高める作用を有するばか
りでなく、塗工時の被覆剤の基材に対する濡れ性を高め
るうえで有効に作用する。また、たとえばAlフィン材
などの表面被覆に適用する場合、焼付け被覆中に存在す
る界面活性剤や前記非架橋の水溶性高分子化合物は、焼
付け被覆表面に凝縮した水と共に溶出するが、その際に
被覆表面に付着しているごみや油などの撥水化因子を伴
って流下するため、被覆の親水性持続にも有効に作用す
る。
Further, the surfactant used as necessary not only has the effect of further increasing the hydrophilicity of the burn-in coating, but is also effective in increasing the wettability of the coating agent to the substrate during coating. To work. When applied to a surface coating such as an Al fin material, the surfactant and the non-crosslinked water-soluble polymer compound present in the baking coating elute together with water condensed on the baking coating surface. Since it flows down along with water-repellent factors such as dust and oil adhering to the coating surface, it also effectively acts on the hydrophilicity of the coating.

【0024】こうした作用を有効に発揮させる上で好ま
しい界面活性剤の含有量は、被覆剤中に占める量で0.
1〜1.0重量%の範囲である。界面活性剤の種類は特
に制限されず、アニオン系、カチオン系、ノニオン系、
両性の全ての界面活性剤を使用することができ、たとえ
ばアニオン系としてはアルキルスホン酸エステルやポリ
オキシエチレンアルキルフェニルエーテル硫酸塩等;ノ
ニオン系としてはポリオキシエチレンアルキルフェニル
エーテルやポリオキシエチレン/ポリオキシプロピレン
共重合体脂肪酸エステル等;カチオン系としてはアルキ
ルアミン塩やアルキルメチルトリメチルアンモニウムク
ロリド等;両性としてはアルキルアミノプロピオン酸塩
やアルキルジメチルベタイン等が好ましいものとして例
示される。
The content of the surfactant which is preferable for effectively exhibiting such an action is 0.
It is in the range of 1 to 1.0% by weight. The type of surfactant is not particularly limited, and may be anionic, cationic, nonionic,
All amphoteric surfactants can be used, for example, alkyl sulfonic acid esters and polyoxyethylene alkyl phenyl ether sulfates as anionic type; polyoxyethylene alkyl phenyl ethers and polyoxyethylene / poly type as nonionic type. Preferred examples include oxypropylene copolymer fatty acid ester and the like; cationic amines such as alkylamine salt and alkylmethyltrimethylammonium chloride; and amphoteric properties such as alkylaminopropionate and alkyldimethylbetaine.

【0025】本発明の被覆剤中には、更に他の添加剤と
して必要に応じて防かび剤、抗菌剤、消臭剤、着色剤、
分散剤等を添加し、被覆剤としての塗工性や基材への密
着性を高めたり、被覆の耐久性等を一層高めることも有
効であり、それらも勿論本発明の技術的範囲に包含され
る。
The coating composition of the present invention may further contain other additives such as an antifungal agent, an antibacterial agent, a deodorant, a coloring agent, if necessary.
It is also effective to add a dispersant or the like to improve the coatability as a coating agent and the adhesion to a substrate, or to further enhance the durability of the coating, etc., and of course, they are also included in the technical scope of the present invention. To be done.

【0026】本発明の親水性皮膜形成用被覆剤は、前述
の必須成分(a)〜(c)および必要により併用される
水溶性高分子化合物や界面活性剤その他の副添加成分を
水に均一に溶解(もしくは乳化状態で均一に分散)して
なる水性液であり、適度の粘度を有するものであって、
例えばAlやAl合金等からなる熱交換器用フィン材の
表面に、乾燥状態での付着量で好ましくは1〜50mg
/dm2 、好ましくは3〜30mg/dm2 程度となる
様に塗布し、通常は130〜260℃程度、好ましくは
160〜240℃程度で10秒〜5分程度加熱焼付け処
理すると、水膜形成能の非常に高い被覆が形成される。
こうした塗布・焼付け工程は、生産性を高める意味か
ら、帯状の被覆基材に対してオンラインで連続的に実施
することが望ましい。そしてこの様な条件で焼付け処理
を行なうと、先に説明した様に、アミノ基含有高分子
(a)がアルデヒド基含有化合物(c)と架橋反応を起
こして表面粗面度を高める粒状物が生成し、またエーテ
ル含有高分子(b)は該粒状物のマトリックス層を形成
すると共にアミノ基含有高分子(a)と会合体を形成
し、水に非溶出性の親水性被覆が形成される。
The hydrophilic film-forming coating material of the present invention comprises the above-mentioned essential components (a) to (c) and, if necessary, a water-soluble polymer compound, a surfactant, and other sub-additive components which are uniformly added to water. Which is an aqueous liquid dissolved in (or uniformly dispersed in an emulsified state) and has an appropriate viscosity,
For example, on the surface of the fin material for a heat exchanger made of Al or Al alloy, etc., the amount of adhesion in a dry state is preferably 1 to 50 mg.
/ Dm 2, preferably coated so as to be 3 to 30 mg / dm 2 about, typically about one hundred thirty to two hundred and sixty ° C., and preferably to about 10 seconds to 5 minutes heat baking treatment at about 160 to 240 ° C., water film formation A very functional coating is formed.
From the standpoint of increasing productivity, it is desirable that such a coating / baking step be continuously carried out on-line with respect to the strip-shaped coated substrate. When the baking treatment is performed under such conditions, as described above, the amino group-containing polymer (a) causes a cross-linking reaction with the aldehyde group-containing compound (c) to form particles that increase the surface roughness. In addition, the ether-containing polymer (b) forms a matrix layer of the granules and forms an aggregate with the amino group-containing polymer (a) to form a non-eluting hydrophilic coating for water. .

【0027】この被覆は、前述の如くその表面に架橋反
応物からなる直径0.1〜3.0μm程度の粒状突起物
が、独立して、或は互いに接触もしくは連結して多数存
在する表面性状を有しており、該被覆表面は全面に渡っ
て高い親水性を示すと共に、粒状突起物によって表面に
微細な凹凸が無数に形成されて大きな表面積を有してい
る。従って、該被覆の表面に結露水が水滴状で付着した
としても、その水滴は直ちに被覆表面に沿って流延し水
膜を形成して流下する。従って、先に従来技術で指摘し
た様な水滴の付着・滞留が起こって通風抵抗が増大す
る、いわゆる「ブリッジ現象」が確実に阻止され、熱交
換効率の低下や付着水の飛散や騒音の発生とい問題を悉
く解消することが可能となる。しかも、該焼付け被覆は
水に対する耐溶出性にも非常に優れたものであるから、
上記の様なブリッジ現象阻止効果を長期間持続すると共
に、該被覆は潤滑性においても優れているので加工性も
良好であり、被覆形成後に2次加工を行なうことも容易
であるなど、従来の親水化処理法に比べて多くの利点を
享受できる。
As described above, this coating has a surface property in which a large number of granular protrusions having a diameter of about 0.1 to 3.0 μm, which are made of a cross-linking reaction product, are present on the surface independently or in contact with or connected to each other. The coated surface has high hydrophilicity over the entire surface, and a large number of fine projections and depressions are formed on the surface by the granular projections to have a large surface area. Therefore, even if the condensed water adheres to the surface of the coating in the form of water droplets, the water droplets immediately flow along the surface of the coating to form a water film and flow down. Therefore, the so-called "bridge phenomenon", which increases the ventilation resistance due to the adhesion and retention of water droplets as previously pointed out in the prior art, is reliably prevented, and the heat exchange efficiency is reduced and the adhered water is scattered and noise is generated. It will be possible to solve the problem. Moreover, since the baked coating is also very excellent in elution resistance to water,
In addition to maintaining the above-mentioned bridging phenomenon preventing effect for a long period of time, the coating is excellent in lubricity and thus has good workability, and it is easy to carry out secondary processing after forming the coating. Many advantages can be enjoyed as compared with the hydrophilic treatment method.

【0028】尚、上記本発明の被覆剤は、表面の親水性
を高めて水膜形成能向上が求めらる様々の用途に適用で
きるが、中でも現在最も広く実用化されているAlやA
l合金製熱交換器用フィン材の表面被覆に利用すれば、
その性能が遺憾なく発揮される。AlやAl合金フィン
材の表面にこの被覆を形成するに当たっては、該被覆の
形成に先だって基材表面にクロメート処理やりん酸塩処
理、あるいはクロム化合物や燐酸塩化合物等を含む有機
樹脂被覆処理等を施し、フィン材としての耐食性などを
高めることも有効である。
The coating agent of the present invention can be applied to various uses in which the hydrophilicity of the surface is enhanced and the water film forming ability is required to be improved.
If it is used for the surface coating of fin material for heat exchanger made of l alloy,
Its performance is fully demonstrated. In forming this coating on the surface of Al or Al alloy fin material, chromate treatment or phosphate treatment on the surface of the base material, or organic resin coating treatment containing a chromium compound, a phosphate compound or the like prior to the formation of the coating. It is also effective to increase corrosion resistance as a fin material by applying

【0029】[0029]

【実施例】次に実施例および比較例を挙げて本発明のを
より具体的に説明するが、本発明はもとより下記実施例
によって制限を受けるものではなく、前・後記の趣旨に
適合し得る範囲で適当に変更を加えて実施することも勿
論可能であり、それらはいずれも本発明の技術的範囲に
含まれる。
EXAMPLES Next, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited by the following examples and may be adapted to the gist of the preceding and the following. It is of course possible to make appropriate modifications within the scope, and all of them are included in the technical scope of the present invention.

【0030】実施例 脱脂処理と水洗により清浄化したAl板(材質:113
0,H26、厚さ:0.1mm)よりなる熱交換器用フ
ィン材を基材とし、その表面に耐食性改善のため塗布型
クロメート処理またはりん酸クロメート処理を施し、親
水性被覆形成基材として使用した。
Example An Al plate (material: 113) cleaned by degreasing and washing with water
(0, H26, thickness: 0.1 mm) is used as the base material of the heat exchanger fin material, and the surface is subjected to coating type chromate treatment or phosphoric acid chromate treatment to improve the corrosion resistance and used as a hydrophilic coating forming base material. did.

【0031】表1に示す成分組成の親水性皮膜形成用被
覆剤を調製し、各被覆剤を上記フィン基材の表面に乾燥
後の付着量が約10mg/dm2 となる様に塗布した
後、表2に示す条件で焼付け処理を行なって親水性被覆
を形成した。得られた各表面被覆Alフィン材につい
て、下記の方法で水濡れ性と対水接触角を測定すると共
に被覆の表面構造を観察し、更に加工性を調べることに
よりフィン材としての有用性を評価した。尚、水濡れ性
と対水接触角の測定は、親水持続性を確認するため下記
の耐久処理を行なった後に実施した。
After preparing a coating for forming a hydrophilic film having the component composition shown in Table 1, each coating was applied to the surface of the fin base material so that the adhesion amount after drying was about 10 mg / dm 2. A baking treatment was performed under the conditions shown in Table 2 to form a hydrophilic coating. For each surface-coated Al fin material obtained, the usefulness as a fin material was evaluated by measuring the water wettability and the contact angle with water by the following methods, observing the surface structure of the coating, and further examining the workability. did. The water wettability and the contact angle with water were measured after carrying out the following durability treatment in order to confirm the hydrophilic sustainability.

【0032】まず初期耐久処理として、各試料片を純水
に24時間浸漬し、その後80℃で30分間乾燥処理し
た後の各試料表面の接触角と水濡れ性を測定した。また
長期耐久処理として、純水浸漬8時間→80℃乾燥16
時間を1サイクルとする乾・湿サイクル試験を5サイク
ル実施した後の接触角を測定した。
First, as an initial durability treatment, each sample piece was dipped in pure water for 24 hours and then dried at 80 ° C. for 30 minutes, and then the contact angle and water wettability of each sample surface were measured. As a long-term durability treatment, soak in pure water for 8 hours → dry at 80 ° C 16
The contact angle was measured after 5 cycles of the dry / wet cycle test with a time of 1 cycle.

【0033】尚、対水接触角は協和界面科学株式会社製
の接触角計「CA−A」によって測定し、また水濡れ性
は、純水の霧吹き噴霧による水の付着状況から、下記の
基準で評価した。 ◎:全面濡れ ○:表面積の10%以内で水はじきあり △:表面積の50%以内で水はじきあり ×:表面積の50%超で水はじきあり
The contact angle to water was measured by a contact angle meter "CA-A" manufactured by Kyowa Interface Science Co., Ltd., and the water wettability was determined according to the following criteria from the adhesion state of water by spraying pure water. It was evaluated by. ◎: Wet all over ○: Water repellent within 10% of surface area △: Water repellent within 50% of surface area ×: Water repellent over 50% of surface area

【0034】また加工性は、耐久性処理を施していない
試料片を使用し、被覆物表面の動摩擦係数の数値(新東
科学社製の表面性測定器を使用、荷重50g、掃引速度
100mm/分)により下記の基準で評価した。 ◎:動摩擦係数0.10以下 ○: 同 0.11〜0.19 △: 同 0.20〜0.29 ×: 同 0.30以上
As for workability, a sample piece not subjected to a durability treatment was used, and the numerical value of the dynamic friction coefficient of the coating surface (using a surface property measuring instrument manufactured by Shinto Kagaku Co., load 50 g, sweep speed 100 mm / Min) was evaluated according to the following criteria. ◎: dynamic friction coefficient 0.10 or less ○: same 0.11 to 0.19 △: same 0.20 to 0.29 ×: same 0.30 or more

【0035】更に、被覆の表面構造の観察は、前述の方
法で初期耐久処理を施した試験片に金蒸着を施した後、
電子顕微鏡により表面性状を観察し、下記の基準で評価
した。 ◎:被覆表面に0.1〜3.0μm程度の微細突起が多
数形成されて表面が高度に粗面化されているもの ○:被覆表面に凹凸が認められ、表面がかなり粗面化さ
れているもの ×:被覆表面が平滑で殆んど粗面化されていないもの、
あるいは被覆が剥離し基材表面が露出しているもの 結果を表2に一括して示す。
Further, the observation of the surface structure of the coating is carried out by subjecting the test piece subjected to the initial durability treatment by the above-mentioned method to the vapor deposition of gold,
The surface properties were observed with an electron microscope and evaluated according to the following criteria. ⊚: A large number of fine protrusions of about 0.1 to 3.0 μm are formed on the coated surface and the surface is highly roughened. ◯: Unevenness is recognized on the coated surface, and the surface is considerably roughened. X: The coating surface is smooth and almost not roughened,
Alternatively, the coating is peeled off and the surface of the substrate is exposed. The results are collectively shown in Table 2.

【0036】尚、表1に記号で示した被覆構成成分は下
記の通りである。アミド基含有高分子(a) C:アニオン性ポリアクリルアミド(数平均分子量30
万〜50万)(ハリマ化成社製、商品名「ハーマイドC
−10」) D:カチオン性ポリアクリルアミド(数平均分子量10
万〜20万)(ハリマ化成社製、商品名「ハリフィック
スUF−570」) E:ノニオン性ポリアクリルアミド(数平均分子量、約
30万)(ハリマ化成社製、商品名「ハリコート105
7」)エーテル含有高分子(b) F:ポリエチレングリコール(数平均分子量約100
0) G:ポリエチレングリコール(数平均分子量約600
0) H:ポリエチレングリコール(数平均分子量約2000
0) I:PEO−1(住友精化社製、数平均分子量約15万
〜40万) J:PEO−3(住友精化社製、数平均分子量約60万
〜110万) K:ポリエチレングリコール−ポリプロピレングリコー
ル共重合体(PEG:PPG=8:2、数平均分子量約
20000)
The coating components shown by symbols in Table 1 are as follows. Amide group-containing polymer (a) C: anionic polyacrylamide (number average molecular weight 30
10,000 to 500,000) (made by Harima Chemicals Co., Ltd., product name "Harmide C"
-10 ") D: Cationic polyacrylamide (number average molecular weight 10
10,000 to 200,000) (manufactured by Harima Kasei, trade name "Harifix UF-570") E: nonionic polyacrylamide (number average molecular weight, about 300,000) (manufactured by Harima Kasei, trade name "Haricoat 105"
7 ") ether-containing polymer (b) F: polyethylene glycol (number average molecular weight of about 100)
0) G: polyethylene glycol (number average molecular weight of about 600)
0) H: polyethylene glycol (number average molecular weight of about 2000)
0) I: PEO-1 (Sumitomo Seika Co., Ltd., number average molecular weight about 150,000 to 400,000) J: PEO-3 (Sumitomo Seika Co., number average molecular weight of about 600,000 to 1.1 million) K: Polyethylene glycol -Polypropylene glycol copolymer (PEG: PPG = 8: 2, number average molecular weight about 20,000)

【0037】アルデヒド基含有化合物(c) L:グリオキザール(試薬) M:こはく酸ジアルデヒドその他の水溶性高分子化合物 N:カルボキシメチルセルロース(第一工業製薬社製、
商品名「セロゲンWS−C」 O:ヒドロキシプロピルメチルセルロース(信越化学社
製、商品名「メトローズ 60SH−4000」 P:ポリビニルアルコール(信越化学社製、商品名「信
越ポバール C−05」) Q:ポリビニルピロリドン(BASF社製「K−3
0」)界面活性剤 R:ポリオキシエチレンオクチルフェニルエーテル(花
王社製、商品名「エマルゲン840S」) S:ドデシルベンゼンスルホン酸ナトリウム(花王社
製、商品名「ネオペレックスF−65」) T:エチレンオキサイド付加型アンモニウムクロライド
(ライオン社製、商品名「エソカードC/25」) また、表2における下地皮膜の構成は、A:塗布型クロ
メート処理、B:りん酸クロメート処理を表わしてい
る。
Aldehyde group-containing compound (c) L: glyoxal (reagent) M: succinic dialdehyde or other water-soluble polymer compound N: carboxymethyl cellulose (manufactured by Daiichi Kogyo Seiyaku Co., Ltd.,
Trade name "Serogen WS-C" O: Hydroxypropyl methylcellulose (Shin-Etsu Chemical Co., Ltd., trade name "Metroses 60SH-4000" P: Polyvinyl alcohol (Shin-Etsu Chemical Co., trade name "Shin-Etsu Poval C-05") Q: Polyvinyl Pyrrolidone ("K-3" manufactured by BASF)
0 ") Surfactant R: polyoxyethylene octyl phenyl ether (manufactured by Kao, trade name" Emulgen 840S ") S: sodium dodecylbenzenesulfonate (manufactured by Kao, trade name" NeoPerex F-65 ") T: Ethylene oxide addition type ammonium chloride (manufactured by Lion Corporation, trade name "Esocard C / 25") Further, the constitution of the base film in Table 2 represents A: coating type chromate treatment and B: phosphoric acid chromate treatment.

【0038】[0038]

【表1】 [Table 1]

【0039】[0039]

【表2】 [Table 2]

【0040】表1,2より次の様に考察できる。実施例
1〜39は、本発明の規定要件を全て満足する被覆剤を
用いて得た親水性被覆であり、水濡れ性、対水接触角、
加工性、表面構造のいずれにおいても非常に良好な結果
が得られている。尚実施例33〜39は、被覆剤を構成
する各成分が好ましい範囲を若干外れるものであるが、
比較例に比べると優れた性能を有していることが分か
る。
The following can be considered from Tables 1 and 2. Examples 1 to 39 are hydrophilic coatings obtained by using coating agents that satisfy all the requirements of the present invention, water wettability, contact angle to water,
Very good results have been obtained in both workability and surface structure. In Examples 33 to 39, the components constituting the coating material are slightly out of the preferable ranges,
It can be seen that it has excellent performance as compared with the comparative example.

【0041】これらに対し比較例1〜7は、被覆剤の成
分組成が本発明の規定要件を外れる例であり、いずれも
被覆の表面構造が悪く(粗面化が殆んどなされておら
ず)、そのため水濡れ性と対水接触角がいずれも実施例
に比べて劣悪であることが分かる。
On the other hand, Comparative Examples 1 to 7 are examples in which the component composition of the coating material deviates from the requirements specified in the present invention, and the surface structure of the coating is poor (rough surface roughening is hardly achieved). ), Therefore, both the water wettability and the contact angle with water are inferior as compared with the examples.

【0042】尚図1〜4は、上記表1,2に示した実施
例、比較例で得た被覆のうち代表的な表面構造を示す図
面代用顕微鏡写真であり、図1は実施例1,図2は実施
例4,図3は実施例24の各表面構造であって、いずれ
も表面に微細な微粒子が独立しあるいは相互に接触もし
くは連結して多数存在して多数の凹凸が形成されている
ことが分かる。これに対し図4は、比較例3で得た被覆
の表面性状を示すものであり、被覆表面には極く微細な
凹凸が認められるものの全体としては殆んど平滑であ
り、粗面化による表面積拡大効果を期待し得ないもので
あることが分かる。
1 to 4 are micrographs as substitutes for drawings showing typical surface structures of the coatings obtained in the examples and comparative examples shown in Tables 1 and 2, and FIG. FIG. 2 shows the surface structure of Example 4 and FIG. 3 shows the surface structure of Example 24. In each case, a large number of fine particles are present independently or in contact with or connected to each other to form a large number of irregularities. I know that On the other hand, FIG. 4 shows the surface properties of the coating obtained in Comparative Example 3, and although the coating surface has very fine irregularities, it is almost smooth as a whole and is roughened by roughening. It can be seen that the effect of increasing the surface area cannot be expected.

【0043】[0043]

【発明の効果】本発明は以上の様に構成されており、被
覆剤の成分組成を特定することによって、優れた親水性
を有し水膜形成を著しく助長して水滴の付着を長期間に
わたって確実に阻止し、かつ被覆形成素材としての成形
加工性が良好で金型摩耗も少なく、更には耐食性等に悪
影響を及ぼすこともない、優れた性能の親水性皮膜を形
成し得る様な皮膜形成用被覆剤を提供することができ、
これを空調機等の熱交換器用フィン材として利用するこ
とにより、水滴の付着を効果的に阻止して水の流下を容
易にし、通風抵抗の低減等に優れた特長を発揮する高性
能の表面処理熱交換器用部材を提供し得ることになっ
た。
EFFECTS OF THE INVENTION The present invention is constituted as described above, and by specifying the component composition of the coating agent, it has excellent hydrophilicity and remarkably promotes the formation of a water film to adhere water droplets for a long period of time. Film formation that can form a hydrophilic film with excellent performance that reliably blocks, has good moldability as a coating forming material, has little die wear, and does not adversely affect corrosion resistance etc. Can provide a coating for
By using this as a fin material for heat exchangers of air conditioners, etc., a high-performance surface that effectively prevents water droplets from adhering to facilitate the flow of water and exhibits excellent features such as reduced ventilation resistance. It has become possible to provide a member for a processing heat exchanger.

【図面の簡単な説明】[Brief description of drawings]

【図1】実施例で得た被覆の表面性状を示す図面代用顕
微鏡写真である。
FIG. 1 is a drawing-substitute micrograph showing the surface properties of coatings obtained in Examples.

【図2】他の実施例で得た被覆の表面性状を示す図面代
用顕微鏡写真である。
FIG. 2 is a drawing-substituting photomicrograph showing the surface properties of coatings obtained in other examples.

【図3】更に他の実施例で得た被覆の表面性状を示す図
面代用顕微鏡写真である。
FIG. 3 is a drawing-substituting micrograph showing the surface properties of coatings obtained in still another example.

【図4】比較例で得た被覆の表面性状を示す図面代用顕
微鏡写真である。
FIG. 4 is a drawing-substituting micrograph showing the surface properties of a coating obtained in a comparative example.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 F28F 13/18 F28F 13/18 B ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display area F28F 13/18 F28F 13/18 B

Claims (11)

【特許請求の範囲】[Claims] 【請求項1】 分子内にアミド基を有する高分子化合物
(a)と、分子内にエーテル結合を有する高分子化合物
(b)と、分子内に少なくとも2個のアルデヒド基を有
する化合物(c)とを必須成分として含有する水性液か
らなることを特徴とする親水性皮膜形成用被覆剤。
1. A polymer compound (a) having an amide group in the molecule, a polymer compound (b) having an ether bond in the molecule, and a compound (c) having at least two aldehyde groups in the molecule. A coating agent for forming a hydrophilic film, comprising an aqueous liquid containing and as an essential component.
【請求項2】 分子内にアミド基を有する高分子化合物
(a)が、ポリ(メタ)アクリルアミドである請求項1
に記載の親水性皮膜形成用被覆剤。
2. The polymer compound (a) having an amide group in the molecule is poly (meth) acrylamide.
The coating agent for forming a hydrophilic film as described in 1.
【請求項3】 分子内にエーテル結合を有する高分子化
合物(b)が、ポリアルキレングリコールである請求項
1または2に記載の親水性皮膜形成用被覆剤。
3. The hydrophilic film-forming coating agent according to claim 1, wherein the polymer compound (b) having an ether bond in the molecule is polyalkylene glycol.
【請求項4】 分子内に少なくとも2個のアルデヒド基
を有する化合物(c)が、グリオキザールである請求項
1〜3のいずれかに記載の親水性皮膜形成用被覆剤。
4. The hydrophilic film-forming coating agent according to claim 1, wherein the compound (c) having at least two aldehyde groups in the molecule is glyoxal.
【請求項5】 重量%で 分子内にアミド基を有する高分子化合物(a):0.5
〜5%、 分子内にエーテル結合を有する高分子化合物(b):1
〜10%、 分子内に少なくとも2個のアルデヒド基を有する化合物
(c):0.2〜2%を含有するものである請求項1〜
4のいずれかに記載の親水性皮膜形成用被覆剤。
5. A polymer compound (a) having an amide group in the molecule at 0.5% by weight: 0.5
~ 5%, polymer compound having an ether bond in the molecule (b): 1
A compound (c) having at least two aldehyde groups in the molecule: 0.2 to 2%.
4. The hydrophilic film-forming coating agent according to any one of 4 above.
【請求項6】 他の成分として、上記成分(a)〜
(c)以外の水溶性高分子化合物を含有するものである
請求項1〜5のいずれかに記載の親水性皮膜形成用被覆
剤。
6. The above-mentioned components (a) to (6) as other components.
The coating agent for forming a hydrophilic film according to any one of claims 1 to 5, which contains a water-soluble polymer compound other than (c).
【請求項7】 水溶性高分子化合物がカルボキシメチル
セルロースである請求項6に記載の親水性皮膜形成用被
覆剤。
7. The hydrophilic film-forming coating agent according to claim 6, wherein the water-soluble polymer compound is carboxymethyl cellulose.
【請求項8】 他の成分として界面活性剤を含有するも
のである請求項1〜7のいずれかに記載の親水性皮膜形
成用被覆剤。
8. The hydrophilic film-forming coating material according to claim 1, which contains a surfactant as another component.
【請求項9】 請求項1〜8のいずれかに記載された被
覆剤を、熱交換部材の表面に塗布し焼付け被覆したもの
であることを特徴とする熱交換器用部材。
9. A member for a heat exchanger, characterized in that the coating material according to any one of claims 1 to 8 is applied to the surface of a heat exchange member and baked and coated.
【請求項10】 熱交換部材が、AlもしくはAl合金
製の熱交換器用フィン材である請求項8に記載の熱交換
器用部材。
10. The member for a heat exchanger according to claim 8, wherein the heat exchange member is a fin material for a heat exchanger made of Al or an Al alloy.
【請求項11】 直径0.1〜3.0μmの粒状突起物
が、表面に、独立して、或は互いに接触もしくは連結し
て多数存在する被覆が形成されたものである請求項9ま
たは10に記載の熱交換器用部材。
11. The granular projections having a diameter of 0.1 to 3.0 μm are formed on the surface independently, or in contact with or connected to each other, to form a large number of coatings. The member for heat exchangers according to.
JP23574695A 1995-09-13 1995-09-13 Heat exchanger components Expired - Lifetime JP3158989B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003085349A1 (en) * 2002-04-10 2003-10-16 Daikin Industries, Ltd. Surface treatment method for plate material, and radiating fin for heat exchanger
JP2009057512A (en) * 2007-09-03 2009-03-19 Sumitomo Light Metal Ind Ltd Hydrophilic lubricating coating for aluminum, and coated object using the same
JP2013199573A (en) * 2012-03-26 2013-10-03 Mitsubishi Plastics Inc Adhesive film
JP2017043744A (en) * 2015-08-28 2017-03-02 日本パーカライジング株式会社 Surface treatment agent, manufacturing method of coated film and metal material with coated film

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003085349A1 (en) * 2002-04-10 2003-10-16 Daikin Industries, Ltd. Surface treatment method for plate material, and radiating fin for heat exchanger
US7493941B2 (en) 2002-04-10 2009-02-24 Daikin Industries, Ltd. Surface treatment method for plate material, and radiating fin for heat exchanger
US7541066B2 (en) 2002-04-10 2009-06-02 Daikin Industries, Ltd. Surface treatment method for pure aluminum plate material
JP2009057512A (en) * 2007-09-03 2009-03-19 Sumitomo Light Metal Ind Ltd Hydrophilic lubricating coating for aluminum, and coated object using the same
JP2013199573A (en) * 2012-03-26 2013-10-03 Mitsubishi Plastics Inc Adhesive film
JP2017043744A (en) * 2015-08-28 2017-03-02 日本パーカライジング株式会社 Surface treatment agent, manufacturing method of coated film and metal material with coated film
WO2017038251A1 (en) * 2015-08-28 2017-03-09 日本パーカライジング株式会社 Surface treatment agent, film production method, and film-equipped metal material
CN107922779A (en) * 2015-08-28 2018-04-17 日本帕卡濑精株式会社 Surface conditioning agent, the manufacture method of overlay film and the metal material with overlay film

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