JPH07216259A - Surface coated material having formed hydrophilic coating and surface coating composition for providing hydrophilic nature - Google Patents
Surface coated material having formed hydrophilic coating and surface coating composition for providing hydrophilic natureInfo
- Publication number
- JPH07216259A JPH07216259A JP6007853A JP785394A JPH07216259A JP H07216259 A JPH07216259 A JP H07216259A JP 6007853 A JP6007853 A JP 6007853A JP 785394 A JP785394 A JP 785394A JP H07216259 A JPH07216259 A JP H07216259A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- weight
- parts
- pts
- polymer
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2245/00—Coatings; Surface treatments
- F28F2245/02—Coatings; Surface treatments hydrophilic
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、親水性被覆の形成され
た表面被覆物および表面被覆用組成物に関し、より詳細
には、基材表面に、親水性樹脂を主体とする特異な表面
構造の被覆を形成することによって水滴の付着を無くし
た表面被覆物、及びこの様な被覆を形成するための表面
被覆用組成物に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface coating and a surface coating composition having a hydrophilic coating formed thereon, and more specifically, to a surface of a substrate having a unique surface structure mainly composed of a hydrophilic resin. The present invention relates to a surface coating in which the adhesion of water droplets is eliminated by forming the above coating, and a surface coating composition for forming such a coating.
【０００２】尚、本発明は、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
金部材への水滴の付着を防止して水の流下を容易にし、
圧力損失を低減するための手段として有効に活用するこ
とができるので、本明細書においては熱交換器用放熱板
の表面に親水性被覆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。The present invention facilitates the flow of water by preventing water droplets from adhering to Al or Al alloy members for heat exchangers used as heat sinks of heat exchangers such as air conditioners,
Since it can be effectively utilized as a means for reducing the pressure loss, in the present specification, the case of forming a hydrophilic coating on the surface of the heat dissipation plate for the heat exchanger will be mainly described, but the present invention is not limited to this. It is not limited to those uses.
【０００３】[0003]
【従来の技術】通常、空調機などに使用される熱交換器
は、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
れたものが多い。このタイプの熱交換器では、空調機運
転時にフィンの表面温度が大気の露点以下となるため、
空気中の水分の凝縮によって水滴が付着し、フィン間が
該付着水により封鎖されて通風抵抗が増大する、いわゆ
る「ブリッジ現象」が生じ、熱交換器の性能が低下した
り、騒音が発生するといった問題がしばしば経験され
る。これらの問題は、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、益々顕著になってきている。2. Description of the Related Art Generally, a heat exchanger used for an air conditioner is 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 fin pipe. There are many. In this type of heat exchanger, the surface temperature of the fins is below the dew point of the atmosphere when operating the air conditioner,
Water droplets are attached due to the condensation of water in the air, the fins are blocked by the attached water and ventilation resistance increases, so-called "bridge phenomenon" occurs, the performance of the heat exchanger deteriorates, and noise is generated. Such problems are often experienced. These problems are becoming more and more prominent due to the narrowing of the fin pitch accompanying the miniaturization of the heat exchanger.
【０００４】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防止
し、フィン間のブリッジ現象を防ぐ方法が知られてい
る。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）などの無機系親水化処理
を施す方法（特開昭５８−１２６９８９号など）、 ポリビニルアルコールやセルロース系ポリマー、ポリ
（メタ）アクリル酸系ポリマーなどの親水性樹脂や界面
活性剤などを含有する塗料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向上させる方法
（特開昭６４−３８４８１号など） があり、こうした表面親水化処理によって、水の接触角
で定量評価できるフィン材表面の親水性が向上し、それ
に伴って通風抵抗で定量評価できる熱交換器の熱交換効
率を向上し得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の場合も同様である。In order to solve such a problem, there is known a method of imparting hydrophilicity to the surface of an Al alloy fin material to prevent water droplets from adhering to prevent a bridge phenomenon between fins. As a method of imparting hydrophilicity to the surface of the Al alloy fin material, a method of applying an inorganic hydrophilization treatment such as alkali silicate (water glass) (JP-A-58-126989), polyvinyl alcohol or cellulose-based A method for imparting hydrophilicity to the fin material surface to improve water wettability by applying a coating material containing a hydrophilic resin such as a polymer or a poly (meth) acrylic acid-based polymer and a surfactant. 64-38481), and such surface hydrophilization treatment improves the hydrophilicity of the fin material surface that can be quantitatively evaluated by the contact angle of water, and the heat exchange efficiency of the heat exchanger that can be quantitatively evaluated by ventilation resistance. It has been confirmed that the above can be improved, and this tendency is the same also in the case of the fin material for heat exchangers made of copper alloy.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記
の方法によって表面処理の施されたフィン材は、親水性
は良好であるが、表面硬度が硬くなるため熱交換器製造
の際の必須プロセスであるプレス加工時の金型の摩耗が
著しくなるという欠点がある。また、シリカ独特の臭気
があり、空調機の様に室内に設置した場合、異臭による
不快感を催すことも指摘されている。一方、上記の方
法によって表面処理を施したフィン材では、金型摩耗や
臭気の問題は生じないものの、親水性樹脂や界面活性剤
の流出・劣化等によって親水性が経時的に劣化すること
があり、一層の親水性向上が求められている。However, the fin material surface-treated by the above-mentioned method has good hydrophilicity, but the surface hardness becomes high, and therefore it is an essential process for manufacturing a heat exchanger. There is a drawback that the die wear during press working becomes significant. It is also pointed out that it has an odor peculiar to silica, and when it is installed indoors like an air conditioner, it causes an unpleasant sensation due to an offensive odor. On the other hand, the fin material surface-treated by the above method does not cause problems such as mold wear and odor, but the hydrophilicity may deteriorate with time due to the outflow / deterioration of the hydrophilic resin and the surfactant. Therefore, further improvement in hydrophilicity is required.
【０００６】そこで、被覆の表面積を増大させ見掛けの
親水性を向上させる方法が検討されている。被覆表面積
を増加させるための方法としては、従来より無機または
有機質の微粒子を添加することによる表面の粗面化、フ
ィン材表面へのクレーター形成、ショットブラスト処理
による粗面化などが検討されている。しかし、無機微粒
子を添加する方法では、一般に無機微粒子が硬質である
ためプレス成形時の金型摩耗が激しくなるという問題が
あるほか、フィン材としての使用時に微粒子の剥離・飛
散によって塗膜が破壊し、それに伴ってフィン材が腐食
したり不快臭が発生するといった問題を引き起こす。し
かも微粒子は二次凝集を起こし易いため、表面積の増大
に有効な凹凸を皮膜表面に効果的に形成しにくく、添加
量に応じた改質効果が得られない。さらに、クレーター
形成やショットブラスト等により皮膜またはフィン材表
面を傷つけて粗面化する方法では、表面の耐食皮膜まで
傷つけるため、耐食性が大幅に悪化するという欠点があ
る。Therefore, a method for increasing the surface area of the coating and improving the apparent hydrophilicity has been investigated. As a method for increasing the coating surface area, surface roughening by adding inorganic or organic fine particles, crater formation on the fin material surface, roughening by shot blasting, etc. have been conventionally considered. . However, the method of adding inorganic fine particles generally has a problem that the die wear during press molding becomes severe because the inorganic fine particles are hard, and the coating film is destroyed by peeling and scattering of fine particles when used as a fin material. However, this causes a problem that the fin material is corroded or an unpleasant odor is generated. Moreover, since the fine particles are likely to cause secondary aggregation, it is difficult to effectively form irregularities effective for increasing the surface area on the surface of the film, and the modifying effect depending on the added amount cannot be obtained. Furthermore, the method of scratching the surface of the coating or the fin material by crater formation or shot blasting to roughen the surface also damages the corrosion-resistant coating on the surface, which has a drawback that the corrosion resistance is significantly deteriorated.
【０００７】本発明はこれらの問題を解決するためにな
されたものであって、その目的は、優れた親水性を有し
水滴の付着を確実且つ長期的に防止し得ると共に、成形
加工性にも優れた表面被覆物、およびその様な優れた表
面被覆を形成することのできる表面被覆用組成物を提供
しようとするものである。The present invention has been made in order to solve these problems, and its purpose is to have excellent hydrophilicity, to prevent water droplets from adhering reliably and for a long time, and to improve moldability. Another object of the present invention is to provide an excellent surface coating, and a surface coating composition capable of forming such an excellent surface coating.
【０００８】[0008]
【課題を解決するための手段】上記課題を解決すること
のできた本発明に係る表面被覆物の構成は、基材表面に
親水性樹脂を含む被覆層が形成されると共に、該被覆表
面には、一辺１０μｍの正方形視野内に、直径０．１〜
１μｍの微粒子が１００個以上相互に非接触状態または
その全部もしくは一部が接合もしくは接触して存在し、
表面に微細な凹凸を有する親水性被覆が形成されたもの
であるところに要旨を有するものであり、ここで使用さ
れる基材としては、Ａｌ、Ｃｕ、Ｆｅ等の金属よりなる
板材や管材等が挙げられ、特に熱交換器用の熱交換部材
に適用すると、結露水による圧損の非常に少ない熱交換
器用のフィン材を得ることができる。Means for Solving the Problems The constitution of the surface coating according to the present invention which has been able to solve the above-mentioned problems is such that a coating layer containing a hydrophilic resin is formed on the surface of a base material and , Within a square field of view of 10 μm on a side, with a diameter of 0.1
100 or more fine particles of 1 μm exist in a non-contact state with each other or all or part of them are joined or contacted,
The main point is that a hydrophilic coating having fine irregularities is formed on the surface, and the base material used here is a plate material or a pipe material made of a metal such as Al, Cu, or Fe. In particular, when applied to a heat exchange member for a heat exchanger, it is possible to obtain a fin material for a heat exchanger with very little pressure loss due to dew condensation water.
【０００９】上記において表面に微粒子が存在する被覆
層は、ポリ（メタ）アクリル酸系ポリマー、セルロース
系ポリマー、ポリりん酸系化合物および架橋剤を構成要
素として含むものが好ましく、その好ましい具体的な成
分組成は、重量比率で ポリ（メタ）アクリル酸系ポリマー：０．３〜５部 セルロース系ポリマー ：０．３〜３部 ポリりん酸系化合物 ： １〜７部 架橋剤 ：０．３〜３部 上記以外の水溶性有機高分子 ：５部以下（０部を
含む） 界面活性剤 ：３部以下（０部を
含む） を構成要素として含有するものである。In the above, the coating layer having fine particles on the surface preferably contains a poly (meth) acrylic acid-based polymer, a cellulose-based polymer, a polyphosphoric acid-based compound and a cross-linking agent as constituent elements. The component composition is a weight ratio: poly (meth) acrylic acid-based polymer: 0.3 to 5 parts Cellulose-based polymer: 0.3 to 3 parts Polyphosphoric acid-based compound: 1 to 7 parts Crosslinking agent: 0.3 to 3 Parts Water-soluble organic polymer other than the above: 5 parts or less (including 0 part) Surfactant: 3 parts or less (including 0 part) as a constituent element.
【００１０】また、本発明の他の構成は、上記の様な被
覆を形成する表面被覆用組成物を提供するものであっ
て、その構成は、水性媒体中へポリ（メタ）アクリル酸
系ポリマー、セルロース系ポリマー、ポリりん酸系化合
物および架橋剤を必須構成成分として分散乃至溶解せし
め、好ましくは、水性溶媒中へ ポリ（メタ）アクリル酸系ポリマー：０．３〜５重量％ セルロース系ポリマー ：０．３〜３重量％ ポリりん酸系化合物 ： １〜７重量％ 架橋剤 ：０．３〜３重量％ 上記以外の水溶性有機高分子 ：５重量％以下（０
重量％を含む） 界面活性剤 ：３重量％以下（０
重量％を含む） を上記成分組成の要件を満たす様に分散乃至溶解せしめ
てなるところに要旨が存在する。Another structure of the present invention is to provide a composition for surface coating which forms the above-mentioned coating, which composition comprises a poly (meth) acrylic acid-based polymer in an aqueous medium. , A cellulose-based polymer, a polyphosphoric acid-based compound and a cross-linking agent are dispersed or dissolved as essential components, and preferably in an aqueous solvent poly (meth) acrylic acid-based polymer: 0.3 to 5% by weight Cellulose-based polymer: 0.3 to 3% by weight Polyphosphoric acid compound: 1 to 7% by weight Crosslinking agent: 0.3 to 3% by weight Water-soluble organic polymer other than the above: 5% by weight or less (0
Surfactant: 3 wt% or less (0% included)
(Including weight%) is dispersed or dissolved so as to satisfy the requirements of the above component composition.
【００１１】上記本発明を実施する際に当たっては、基
材と表面被覆との間に耐食性下地皮膜を形成することに
よって、表面被覆物の耐食性を高めることができるので
好ましい。In carrying out the present invention described above, it is preferable to form a corrosion-resistant undercoat between the substrate and the surface coating because the corrosion resistance of the surface coating can be enhanced.
【００１２】[0012]
【作用】上記の様に本発明の表面被覆物は、金属基材表
面に親水性樹脂を含む被覆層を形成してなり、該被覆表
面の性状として一辺１０μｍの正方形視野内に直径０．
１〜１μｍの微粒子が１００個以上相互に非接触状態ま
たはその全部もしくは一部が接合もしくは接触して存在
し、表面に微細な凹凸が形成されたものであり、こうし
た特異な表面構造の親水性樹脂被覆を設けることによ
り、表面積の大幅拡大とも相まって水膜形成性を著しく
高め、結露水の付着に基づく前述の様な問題を一気に解
消し得るばかりでなく、この被覆はそれ自身親水性を有
するものであるから、長期使用によって結露防止効果が
減退するといった欠点もなく、また表面に形成される微
細な凹凸によってプレス加工時に塗布されるプレス油の
保持性も高められて金型加工面との滑りもよくなり、成
形加工性においても非常に優れたものとなる。As described above, the surface coating of the present invention has a coating layer containing a hydrophilic resin formed on the surface of a metal substrate, and the surface of the coating has a diameter of 0.
100 or more fine particles of 1 to 1 μm exist in a non-contact state with each other or all or part of them are joined or in contact with each other, and fine irregularities are formed on the surface. By providing a resin coating, the water film forming property is significantly enhanced in combination with the large increase in the surface area, and not only the above-mentioned problems due to the attachment of dew condensation water can be solved at once, but the coating itself has hydrophilicity. Therefore, there is no drawback that the dew condensation prevention effect decreases with long-term use, and the fine irregularities formed on the surface also enhance the retention of the press oil applied during press working, and The slipperiness is improved, and the moldability is extremely excellent.
【００１３】従って、本発明の表面被覆物は、表面の親
水性向上が求められたり、水滴付着が問題となる様々の
金属基材の表面改質に幅広く活用することができ、特に
ＡｌまたはＡｌ合金製の熱交換器用フィン材として極め
て有用である。Therefore, the surface coating of the present invention can be widely used for surface modification of various metal substrates which require improvement of hydrophilicity of the surface or water droplet adhesion is a problem, and particularly Al or Al. It is extremely useful as a fin material for heat exchangers made of alloy.
【００１４】上記の様な特異な表面構造の表面被覆は、
前述の如く、ポリ（メタ）アクリル酸系ポリマー、セル
ロース系ポリマー、ポリりん酸系化合物および架橋剤を
必須の構成要素として含み、或はこれらに加えて上記以
外の水溶性有機高分子や界面活性剤を含有する表面被覆
用組成物を基材表面に塗布し乾燥・硬化させることによ
って得ることができる。The surface coating having a unique surface structure as described above is
As described above, it contains a poly (meth) acrylic acid-based polymer, a cellulose-based polymer, a polyphosphoric acid-based compound, and a cross-linking agent as essential constituent elements, or in addition to these, a water-soluble organic polymer other than the above or a surfactant. It can be obtained by applying a surface coating composition containing an agent onto the surface of a substrate, drying and curing.
【００１５】即ち、上記成分を含む表面被覆用組成物
は、親水性高分子の１種であるポリ（メタ）アクリル酸
系ポリマーおよびセルロース系ポリマーの有する親水性
と成膜性により、良好な親水性被覆を形成すると共に、
架橋剤の作用によって耐久持続性が高められ、また架橋
剤は被覆と基材との密着性も高める。更に、ポリりん酸
系化合物、特に無水トリポリりん酸ナトリウムを含有さ
せることによって、上記３成分系では得ることのできな
い特異な表面形態（微細な凹凸形状）を有する表面被覆
を得ることができ、被覆自体の優れた親水性と微細凹凸
による表面積拡大効果によって、優れた結露防止性とそ
の長期持続性、並びに優れた成形加工性を有する表面被
覆物を得ることができる。That is, the surface coating composition containing the above components has a good hydrophilic property due to the hydrophilicity and film-forming property of the poly (meth) acrylic acid type polymer and the cellulosic type polymer which are one kind of hydrophilic polymer. Forming a protective coating,
The action of the cross-linking agent enhances durability and durability, and the cross-linking agent also enhances adhesion between the coating and the substrate. Furthermore, by containing a polyphosphoric acid compound, particularly anhydrous sodium tripolyphosphate, it is possible to obtain a surface coating having a unique surface morphology (fine concavo-convex shape) that cannot be obtained by the above three-component system. By virtue of its excellent hydrophilicity and the effect of enlarging the surface area due to fine irregularities, it is possible to obtain a surface coating having excellent dew condensation prevention property, its long-term sustainability, and excellent moldability.
【００１６】該表面被覆物における被覆層の構成は、重
量比率で ポリ（メタ）アクリル酸系ポリマー：０．３〜５部、よ
り好ましくは０．５〜３部、更に好ましくは０．７〜
２．０部、 セルロース系ポリマー：０．３〜３部、より好ましくは
０．５〜１．５部、更に好ましくは０．７〜１．３部、 ポリりん酸系化合物：１〜７部、より好ましくは１．３
〜４部、更に好ましくは１．５〜３．０部、および 架橋剤：０．３〜３部、より好ましくは０．５〜２部、
更に好ましくは０．７〜１．５部、 上記以外の水溶性有機高分子：５部以下（０部を含
む）、より好ましくは０．３〜３．０部、 界面活性剤：３部以下（０部を含む）、より好ましくは
０．１〜３部 を構成要素として含有するものであり、ポリ（メタ）ア
クリル酸系ポリマーおよびセルロース系ポリマーの含有
率が不足する場合は、被覆の親水性が悪化したり、均質
な被覆を形成しにくくなる傾向が見られ、逆に多過ぎる
場合は、表面被覆用組成物としての粘度が著しく増大
し、基材への均一な塗工が困難になる傾向が表われてく
る。また、ポリりん酸系化合物の含有量が不足する場合
は、微粒子の生成が不十分であるため表面積が増大せ
ず、親水性が悪くなる傾向が表われ、逆に多過ぎる場合
は生成した微粒子が相互に融着して表面積の増大効果が
不十分になる傾向が表われてくる。更に架橋剤の含有量
が不足する場合は被覆の耐久性が低下して、親水性が経
時的に悪くなる傾向が見られ、逆に多過ぎる場合は親水
性を有する水酸基等が架橋反応によって消滅し、親水性
が不十分になる傾向が表われてくる。しかし、上記４成
分を好適比率で含有する被覆は、優れた親水性と被覆強
度および微細な表面凹凸を有する被覆となり、結露防止
性とその持続性並びに成形加工性の非常に良好な表面被
覆物となる。The composition of the coating layer in the surface coating is a poly (meth) acrylic acid polymer: 0.3 to 5 parts by weight, more preferably 0.5 to 3 parts, and still more preferably 0.7 to.
2.0 parts, Cellulosic polymer: 0.3 to 3 parts, more preferably 0.5 to 1.5 parts, still more preferably 0.7 to 1.3 parts, Polyphosphoric acid compound: 1 to 7 parts , And more preferably 1.3
To 4 parts, more preferably 1.5 to 3.0 parts, and crosslinking agent: 0.3 to 3 parts, more preferably 0.5 to 2 parts,
More preferably 0.7 to 1.5 parts, water-soluble organic polymer other than the above: 5 parts or less (including 0 part), more preferably 0.3 to 3.0 parts, surfactant: 3 parts or less (Including 0 part), more preferably 0.1 to 3 parts as a constituent, and when the content of the poly (meth) acrylic acid-based polymer and the cellulose-based polymer is insufficient, the hydrophilicity of the coating Property tends to deteriorate, or it tends to be difficult to form a uniform coating. On the other hand, if the amount is too large, the viscosity of the surface coating composition increases significantly, making uniform coating on the substrate difficult. The tendency to become. Further, when the content of the polyphosphoric acid compound is insufficient, the surface area does not increase due to insufficient formation of fine particles, and the hydrophilicity tends to deteriorate. On the contrary, when the content is too large, the generated fine particles are generated. Tend to be fused to each other and the effect of increasing the surface area becomes insufficient. Further, when the content of the crosslinking agent is insufficient, the durability of the coating is reduced, and the hydrophilicity tends to be deteriorated with time. On the contrary, when the content is too large, hydroxyl groups having hydrophilicity are eliminated by the crosslinking reaction. However, the hydrophilicity tends to be insufficient. However, a coating containing the above-mentioned four components in a suitable ratio is a coating having excellent hydrophilicity, coating strength and fine surface irregularities, and a surface coating excellent in dew condensation prevention property, its durability and molding processability. Becomes
【００１７】この様な構成の表面被覆層は、水性溶媒中
へポリ（メタ）アクリル酸系ポリマー、セルロース系ポ
リマー、ポリりん酸系化合物および架橋剤を必須成分と
して分散乃至溶解せしめた表面被覆用組成物、より具体
的には水性溶媒中へ ポリ（メタ）アクリル酸系ポリマー：０．３〜５重量
％、 セルロース系ポリマー ：０．３〜３重量
％、 ポリりん酸系化合物 ：１〜７重量％、 架橋剤 ：０．３〜３重量
％、 上記以外の水溶性有機高分子 ：５重量％以下（０
重量％を含む）、 界面活性剤 ：３重量％以下（０
重量％を含む）、 が分散乃至溶解された表面被覆用組成物を基材表面に塗
布し、乾燥・硬化させ、あるいはその後必要により水洗
処理することによって容易に得ることができる。The surface coating layer having such a constitution is used for surface coating in which a poly (meth) acrylic acid type polymer, a cellulose type polymer, a polyphosphoric acid type compound and a crosslinking agent are dispersed or dissolved as an essential component in an aqueous solvent. Composition, more specifically in aqueous solvent Poly (meth) acrylic acid-based polymer: 0.3 to 5% by weight, Cellulose-based polymer: 0.3 to 3% by weight, Polyphosphoric acid-based compound: 1 to 7 % By weight, crosslinking agent: 0.3 to 3% by weight, water-soluble organic polymer other than the above: 5% by weight or less (0
Wt%), surfactant: 3 wt% or less (0
It can be easily obtained by coating the surface of the substrate with a composition for surface coating in which the content of the compound is contained or dispersed therein, and drying / curing the composition, or washing with water if necessary.
【００１８】上記において、表面被覆層および被覆用組
成物を構成するポリ（メタ）アクリル酸系ポリマーとし
ては、ポリ（メタ）アクリル酸およびそのアルカリ金属
塩、ポリ（メタ）アクリル酸とポリ酢酸ビニルまたはポ
リビニルアルコールとの共重合体などを挙げることがで
き、これらは単独で使用してもよく或は２種以上を併用
することができる。これらの中でも特にポリアクリル酸
を使用すると、形成される被覆表面の凹凸がより微細な
ものとなって、表面粗面化による表面積増大効果がより
有効に発揮され、親水化効果および成形性向上効果をよ
り確実に発揮することができるので好ましい。表面被覆
用組成物における該ポリ（メタ）アクリル酸系ポリマー
の好ましい含有量の下限値は０．３重量％、より好まし
くは０．５重量％、更に好ましくは０．７重量％、また
好ましい上限値は５重量％、より好ましくは３重量％、
更に好ましくは２重量％であり、その含有量が不足する
場合は、形成される被覆の親水性が不足気味となって満
足のいく結露防止効果が得られにくくなり、逆に多過ぎ
る場合は、被覆用組成物中に固形物が残ったり粘度が高
くなり過ぎ、塗装が困難になって被覆形成が困難になっ
たり均質な被覆が形成されにくくなる。In the above, as the poly (meth) acrylic acid type polymer constituting the surface coating layer and the coating composition, poly (meth) acrylic acid and its alkali metal salts, poly (meth) acrylic acid and polyvinyl acetate are used. Further, a copolymer with polyvinyl alcohol and the like can be mentioned, and these may be used alone or in combination of two or more kinds. Especially when polyacrylic acid is used among these, the unevenness of the formed coating surface becomes finer, and the surface area increasing effect due to surface roughening is more effectively exhibited, and the hydrophilizing effect and moldability improving effect. Is more preferable, so that it is preferable. The lower limit of the preferable content of the poly (meth) acrylic acid-based polymer in the surface coating composition is 0.3% by weight, more preferably 0.5% by weight, further preferably 0.7% by weight, and the preferable upper limit. The value is 5% by weight, more preferably 3% by weight,
More preferably, it is 2% by weight, and if the content is insufficient, the hydrophilicity of the coating formed tends to be insufficient, and it becomes difficult to obtain a satisfactory effect of preventing dew condensation. A solid substance remains in the coating composition or the viscosity becomes too high, which makes coating difficult and makes it difficult to form a coating or makes it difficult to form a uniform coating.
【００１９】またセルロース系ポリマーとしては、ヒド
ロキシプロピルメチルセルロース、ヒドロキシエチルメ
チルセルロース、ヒドロキシプロピルセルロース、カル
ボキシメチルセルロース、メチルセルロース等を挙げる
ことができ、これらは単独で使用してもよく或は必要に
より２種以上を併用することができる。これらの中でも
被覆の親水性や耐久性などを高める上で特に好ましいの
はヒドロキシプロピルメチルセルロースである。該セル
ロース系ポリマーの好ましい含有量の下限値は０．３重
量％、より好ましくは０．５重量％、更に好ましくは
０．７重量％、また好ましい上限値は３重量％、より好
ましくは１．５重量％、更に好ましくは１．３重量％で
あり、その含有量が不足する場合は、形成される被覆の
親水性が不足気味となって満足のいく結露防止効果が得
られにくくなり、逆に多過ぎる場合は、被覆用組成物中
に固形物が残ったり粘度が高くなり過ぎ、塗装が困難に
なって被覆形成が困難になったり均質な被覆が形成され
にくくなる。Examples of the cellulosic polymer include hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, hydroxypropylcellulose, carboxymethylcellulose and methylcellulose, which may be used alone or, if necessary, in combination of two or more. Can be used together. Of these, hydroxypropylmethyl cellulose is particularly preferable in order to improve the hydrophilicity and durability of the coating. The lower limit of the content of the cellulose-based polymer is preferably 0.3% by weight, more preferably 0.5% by weight, still more preferably 0.7% by weight, and the preferable upper limit is 3% by weight, more preferably 1. It is 5% by weight, more preferably 1.3% by weight. If the content is insufficient, the hydrophilicity of the formed coating tends to be insufficient, and it becomes difficult to obtain a satisfactory dew condensation preventing effect. If the amount is too large, solid matter remains in the coating composition or the viscosity becomes too high, which makes coating difficult and makes it difficult to form a coating or makes it difficult to form a uniform coating.
【００２０】また、ポリりん酸系化合物としてはポリり
ん酸ナトリウム、ポリりん酸カリウム、トリポリりん酸
ナトリウムなどが挙げられ、これらも必要により２種以
上を併用することができるが、これらの中でも被覆の表
面積を増大させてその親水性などを高める上で特に好ま
しいのはトリポリりん酸ナトリウムである。該ポリりん
酸系化合物の好ましい含有量の下限値は１重量％、より
好ましくは１．３重量％、更に好ましくは１．５重量
％、また好ましい上限値は７重量％、より好ましくは４
重量％、更に好ましくは３重量％であり、その含有量が
不足する場合は、形成される被覆の粗面化効果（表面積
拡大効果）が不十分となって親水性付与が不足気味にな
り、逆に多過ぎる場合は、生成した粒子が相互に融着し
て表面積の増大効果が不十分になったり均質な被覆が形
成されにくくなる。Examples of the polyphosphoric acid compound include sodium polyphosphate, potassium polyphosphate, sodium tripolyphosphate, and the like. If necessary, two or more kinds can be used in combination, and among them, the coating Sodium tripolyphosphate is particularly preferable in order to increase the surface area of and improve its hydrophilicity. The lower limit of the preferable content of the polyphosphoric acid compound is 1% by weight, more preferably 1.3% by weight, further preferably 1.5% by weight, and the preferable upper limit is 7% by weight, more preferably 4% by weight.
%, And more preferably 3% by weight, and when the content is insufficient, the effect of roughening the surface of the coating formed (surface area expansion effect) becomes insufficient and the hydrophilicity tends to be insufficient, On the other hand, if the amount is too large, the generated particles are fused to each other, and the effect of increasing the surface area becomes insufficient, or it becomes difficult to form a uniform coating.
【００２１】架橋剤として好ましく用いられるのは、下
記およびで示される架橋剤であり、これらも単独で
使用し得るほか、必要に応じて２種以上を併用すること
ができる。The cross-linking agents preferably used are the cross-linking agents shown by the following and, which may be used alone or in combination of two or more as required.
【００２２】メラミン系樹脂、ベンゾグアナミン系樹
脂、尿素系樹脂、イソシアネート系樹脂よりなる群から
選択される少なくとも１種、 Ｔｉ，Ｚｒ，Ｚｎ，Ａｌよりなる群から選択される少
なくとも１種を配位元素として含む金属キレート架橋
剤。At least one selected from the group consisting of melamine-based resins, benzoguanamine-based resins, urea-based resins and isocyanate-based resins, and at least one selected from the group consisting of Ti, Zr, Zn and Al are coordination elements. As a metal chelate cross-linking agent.
【００２３】上記架橋剤の中でも、被覆の耐久性や表面
被覆用組成物の安定性などを一層良好なものとする上で
より好ましいのは炭酸ジルコニアアンモニウムである。
これら架橋剤の好ましい含有量の下限値は０．３重量
％、より好ましくは０．５重量％、また好ましい上限値
は３重量％、より好ましくは２重量％、更に好ましくは
１．５重量％であり、その含有量が不足する場合は、形
成される被覆の経時的な親水性の低下が著しくなる傾向
があり、逆に多過ぎる場合は、被覆用組成物中に固形物
が生じたり被覆の親水性が低下する。Among the above-mentioned crosslinking agents, ammonium zirconia carbonate is more preferable for improving the durability of the coating and the stability of the surface coating composition.
The lower limit of the preferable content of these crosslinking agents is 0.3% by weight, more preferably 0.5% by weight, and the preferable upper limit is 3% by weight, more preferably 2% by weight, further preferably 1.5% by weight. If the content is insufficient, the hydrophilicity of the formed coating tends to be significantly decreased with time. On the contrary, if the content is too large, solid matter is generated in the coating composition or the coating composition is coated. Hydrophilicity is reduced.
【００２４】本発明における必須の構成成分は以上の４
成分であるが、更に他の成分として、上記以外の水溶性
有機高分子化合物や界面活性剤を含有させることができ
る。The essential constituents in the present invention are 4 above.
Although it is a component, a water-soluble organic polymer compound or a surfactant other than the above may be contained as another component.
【００２５】上記以外の水溶性有機高分子としては、ポ
リエチレンオキサイド、ポリビニルアルコール、ポリ酢
酸ビニルの部分ケン化物、水溶性ウレタン、水分散性ウ
レタン樹脂、ポリアクリルアミド、ポリアクリルアミド
メチルプロパンスルフォン酸等が挙げられ、これらも必
要により２種以上を併用することができる。該水溶性有
機高分子は、塗工後の被覆形成能力を一層高める作用を
発揮するが、含有量が過多になり過ぎると表面被覆用組
成物の粘度が増大して塗工が困難になる傾向が生じてく
るので、添加する場合でもその量は５重量％以下に抑え
なければならない。水溶性有機高分子のより好ましい含
有量は０．３〜３重量％の範囲である。Examples of water-soluble organic polymers other than those mentioned above include polyethylene oxide, polyvinyl alcohol, partially saponified polyvinyl acetate, water-soluble urethane, water-dispersible urethane resin, polyacrylamide, and polyacrylamide methyl propane sulfonic acid. However, these can also be used in combination of two or more if necessary. The water-soluble organic polymer exerts an effect of further increasing the coating forming ability after coating, but if the content is too much, the viscosity of the surface coating composition increases and coating tends to be difficult. Therefore, even if added, its amount must be suppressed to 5% by weight or less. The more preferable content of the water-soluble organic polymer is in the range of 0.3 to 3% by weight.
【００２６】また界面活性剤は、表面被覆層の親水性を
一段と高めると共に、塗工時の表面被覆用組成物の基材
に対する濡れ性を一段と高める作用を有している。しか
し含有量が多くなり過ぎると、熱交換器等としての使用
開始直後の被覆の結露水による溶出量が著しくなり、耐
久性が悪くなる傾向が表われてくるので、添加する場合
でもその量は３重量％以下に抑えなければならない。界
面活性剤のこうした特徴を有効に発揮させる上でより好
ましい含有量は０．１〜３重量％である。尚、界面活性
剤としては、アニオン系、ノニオン系、カチオン系、両
性のいずれの界面活性剤を使用することも可能であり、
アニオン系としてはアルキルスルフォン酸エステル塩や
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 surfactant has a function of further enhancing the hydrophilicity of the surface coating layer and further enhancing the wettability of the surface coating composition at the time of coating to the substrate. However, if the content becomes too large, the amount of elution due to the dew condensation water of the coating immediately after the start of use as a heat exchanger will be remarkable, and the durability will tend to deteriorate. Must be kept below 3% by weight. A more preferable content is 0.1 to 3% by weight for effectively exhibiting such characteristics of the surfactant. As the surfactant, any of anionic, nonionic, cationic and amphoteric surfactants can be used.
Anionic alkyl sulfonates, polyoxyethylene alkylphenyl ether sulfates, etc .; nonionic polyoxyethylene alkylphenyl ethers, polyoxyethylene / polyoxypropylene copolymer fatty acid esters, etc .; cationic as alkyl Amine salts, alkylmethyltrimethylammonium chloride and the like; as amphoteric properties, alkylaminopropionate and alkyldimethylbetaine are preferred.
【００２７】本発明に係る上記表面被覆層および表面被
覆用組成物には、必要により更に他の成分として防黴
剤、抗菌剤、消臭剤、着色剤等を含有せしめ、付加的効
果を持たせることも可能である。更に、基材上への塗布
を容易にするため、必要に応じて任意の化合物を使用し
て粘度調整を行なうことも勿論可能である。The surface coating layer and the composition for surface coating according to the present invention may further contain a fungicide, an antibacterial agent, a deodorant, a colorant and the like as other components, if necessary, to have an additional effect. It is also possible to make it. Furthermore, in order to facilitate coating on the substrate, it is of course possible to use any compound to adjust the viscosity, if necessary.
【００２８】上記の表面被覆用組成物を、前述の様な基
材上に塗布し、好ましくは１３０〜２３０℃、より好ま
しくは１６０〜２００℃程度で１０秒乃至１分間程度加
熱処理すると、前述の様な特異な表面構造を有する表面
被覆を形成することができる。この場合、塗工作業性を
高める上では、帯状の基材に連続的に塗布しオンライン
で連続的に乾燥を行なうのが有利である。また、基材と
して金属材を使用するときは、上記親水性被覆の形成に
先立って、基材表面に予め耐食性向上のためのクロメー
ト処理やクロム化合物含有有機皮膜あるいは耐食性有機
樹脂皮膜を形成しておくことも、好ましい方法として推
奨される。When the above-mentioned surface coating composition is applied onto the above-mentioned substrate and heat-treated at preferably 130 to 230 ° C., more preferably 160 to 200 ° C. for 10 seconds to 1 minute, It is possible to form a surface coating having a unique surface structure such as In this case, in order to improve the coating workability, it is advantageous to continuously coat the strip-shaped substrate and continuously dry it online. When a metal material is used as the base material, prior to the formation of the hydrophilic coating, a chromate treatment or a chromium compound-containing organic film or a corrosion-resistant organic resin film for improving corrosion resistance is formed on the surface of the base material in advance. Setting is also recommended as a preferred method.
【００２９】[0029]
【実施例】以下、実施例を挙げて本発明の構成および作
用効果を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して実施することも可
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 The constitutions and effects of the present invention will be specifically described below with reference to examples, but the present invention is not limited by the following examples and can be adapted to the gist of the preceding and the following. It is also possible to appropriately change and implement the range, and all of them are included in the technical scope of the present invention.
【００３０】実施例 予め脱脂および水洗処理したＡｌ合金板（材質：１１３
０、厚さ：０．１ｍｍ、質別：Ｈ２６）の表面上に、塗
布型クロメート処理またはりん酸クロメート処理によっ
て無機質耐食皮膜を形成し、あるいは水溶性アクリルメ
ラミン樹脂（「コスマー９４０１」：関西ペイント製）
を塗工してから２００℃で２０秒間乾燥処理することに
よって皮膜量が１０ｍｇ／ｄｍ2 の有機耐食皮膜を形成
し、下記実験の試験片とした。Example An Al alloy plate (material: 113) that has been previously degreased and washed with water.
0, thickness: 0.1 mm, temper: H26), an inorganic corrosion resistant film is formed by coating type chromate treatment or phosphoric acid chromate treatment, or a water-soluble acrylic melamine resin (“Cosmer 9401”: Kansai Paint) Made)
Was coated and then dried at 200 ° C. for 20 seconds to form an organic corrosion-resistant coating having a coating amount of 10 mg / dm 2 , which was used as a test piece for the following experiment.
【００３１】耐食皮膜を設けた上記試験片の表面に、表
１，２に示した構成の表面被覆剤を乾燥後の被覆量が１
０ｍｇ／ｄｍ2 となる様に塗工した後、２００℃で２０
秒間乾燥処理して親水性被覆を形成した。得られた各表
面被覆試験片について、水濡れ性と対水接触角の測定お
よび被覆の表面構造観察を行ない、表面処理されたＡｌ
板の親水性を評価した。結果を表１，２に示す。On the surface of the above-mentioned test piece provided with the corrosion resistant coating, the coating amount after drying the surface coating agent having the constitution shown in Tables 1 and 2 was 1
After coating so that it becomes 0 mg / dm 2 , it is 20 at 200 ° C.
It was dried for 2 seconds to form a hydrophilic coating. With respect to each of the obtained surface-coated test pieces, water wettability and contact angle with water were measured, and the surface structure of the coating was observed.
The hydrophilicity of the plate was evaluated. The results are shown in Tables 1 and 2.
【００３２】尚、水濡れ性と対水接触角の測定は、試験
片を純水中に２４時間浸積し、その後６０℃で３０分間
乾燥処理した後に行なった。水濡れ性の判断基準は霧吹
き噴霧による水の付着状況により判断した。表中の評価
欄において、◎は全面水濡れ、○は表面積の１０％以内
の水のはじき、△は５０％以内の水のはじき、×は５０
％以上の水はじき状態を示す。The water wettability and the contact angle with water were measured by immersing the test piece in pure water for 24 hours and then drying it at 60 ° C. for 30 minutes. The criteria for water wettability was determined by the state of water adhered by spraying. In the evaluation column of the table, ⊚ indicates that the entire surface is wet, ∘ indicates repelling of water within 10% of the surface area, Δ indicates repelling of water within 50%, and × indicates 50.
% Or more indicates a water repellent state.
【００３３】また皮膜の表面構造の観察は、得られた各
表面被覆試験片に金蒸着を施した後、電子顕微鏡により
行なった。◎は被覆表面に１μｍ以下の微粒子が生成し
て表面が粗面化されているもの、○は１μｍ程度の微粒
子が生成して表面が粗面化されているもの、×は表面が
平滑で粗面化されていないものを示す。表１，２中の符
号は下記の意味を表わしている。The surface structure of the film was observed with an electron microscope after gold vapor deposition was applied to each of the obtained surface-coated test pieces. ⊚ indicates that the coated surface has fine particles of 1 μm or less and the surface is roughened, ◯ indicates that the fine particles of approximately 1 μm are generated and the surface is roughened, and × indicates that the surface is smooth and rough. The one that is not surfaced is shown. The symbols in Tables 1 and 2 have the following meanings.
【００３４】耐食皮膜 Ａ：無機耐食皮膜（塗布型クロメート処理） Ｂ：無機耐食皮膜（りん酸クロメート処理） Ｃ：有機耐食皮膜（関西ペイント製「コスマー９４０
１」） 表面被覆用組成物構成 ポリ（メタ）アクリル酸系ポリマー Ｄ：ポリアクリル酸（日本純薬社製「ジュリマーＡＣ−
１０Ｈ」、有効成分２０重量％ Ｅ：ポリアクリル酸−ポリビニルアルコール共重合体
（住友化学社製「スミカゲルＬ−５ＨＰ」、有効成分５
重量％） Ｆ：ポリアクリル酸アルカリ金属（住友化学社製「スミ
カゲルＮ−１００」） セルロース系ポリマー Ｇ：ヒドロキシプロピルセルロース（信越化学社製「メ
トローズ９０−ＳＨ−４０００」） Ｈ：ヒドロキシエチルセルロース（「信越化学社製「メ
トローズＳＥＢ−４０００」） Ｉ：カルボキシメチルセルロースナトリウム（「ダイセ
ル社製「ＣＭＣダイセル１１５０」） Ｊ：メチルセルロース（信越化学社製「メトローズＳＭ
−４０００」） Ｋ：ヒドロキシプロピルセルロース（信越化学社製「信
越ＨＰＣ ＥＦ−Ｇ」）Corrosion Resistant Film A: Inorganic Corrosion Resistant Film (Coating Chromate Treatment) B: Inorganic Corrosion Resistant Film (Phosphoric Acid Chromate Treatment) C: Organic Corrosion Resistant Film (Kansai Paint Cosmer 940
1 ") Composition of composition for surface coating Poly (meth) acrylic acid-based polymer D: Polyacrylic acid (" Jurimer AC- "manufactured by Nippon Pure Chemical Co., Ltd.)
10H ", 20% by weight of active ingredient E: Polyacrylic acid-polyvinyl alcohol copolymer (" Sumikagel L-5HP "manufactured by Sumitomo Chemical Co., Ltd., active ingredient 5
% By weight F: Alkali metal polyacrylate (“Sumikagel N-100” manufactured by Sumitomo Chemical Co., Ltd.) Cellulose-based polymer G: Hydroxypropyl cellulose (“Metroze 90-SH-4000” manufactured by Shin-Etsu Chemical Co., Ltd.) H: Hydroxyethyl cellulose (“ Shin-Etsu Chemical Co., Ltd. "Metroses SEB-4000") I: Sodium carboxymethylcellulose ("Daicel Co., Ltd." CMC Daicel 1150 ") J: Methylcellulose (Shin-Etsu Chemical Co., Ltd." Metroses SM "
-4000 ") K: Hydroxypropyl cellulose (" Shin-Etsu HPC EF-G "manufactured by Shin-Etsu Chemical Co., Ltd.)
【００３５】ポリりん酸系化合物 Ｌ：無水トリポリりん酸ナトリウム 架橋剤 Ｍ：炭酸ジルコニアアンモニウム水溶液（新日本金属社
製、有効成分１３重量％） Ｎ：メチル化メラミン樹脂（三井サイアナミッド社製
「サイメル３５０」、有効成９７重量％） 水溶性有機高分子 Ｏ：ポリ酢酸ビニル部分けん化物（信越化学社製「信越
ポバールＰＡ−２４ＧＰ」） 界面活性剤 Ｐ：アルキルフェノキシポリエチレングリコールアクリ
レート（第一工業製薬社製「ニューフロンティアＮ−１
７７Ｅ」）Polyphosphoric acid compound L: Sodium tripolyphosphate anhydrous Crosslinking agent M: Ammonium zirconia carbonate aqueous solution (Nippon Metals Co., Ltd., 13% by weight of active ingredient) N: Methylated melamine resin (Cymel 350 manufactured by Mitsui Cyanamid Co., Ltd.) Water-soluble organic polymer O: Partially saponified polyvinyl acetate (Shin-Etsu Chemical Co., Ltd. "Shin-Etsu Poval PA-24GP") Surfactant P: Alkylphenoxy polyethylene glycol acrylate (Daiichi Kogyo Seiyaku Co., Ltd.) "New Frontier N-1"
77E ")
【００３６】[0036]
【表１】 [Table 1]
【００３７】[0037]
【表２】 [Table 2]
【００３８】表１，２より次の様に考察することができ
る。実施例１〜１９は本発明の規定要件を全て満足する
ものであり、いずれも水濡れ性が良好で接触角は比較例
に比べて小さく、またそれらの被覆の表面構造は、後述
する如く一辺１０μｍの正方形視野内に、直径０．１〜
１μｍの微粒子が１００個以上相互に非接触状態または
その全部もしくは一部が接合もしくは接触して存在し、
表面に微細な凹凸を有する親水性被覆が形成されてい
る。ちなみに図１〜３は、上記実施例で得た表面被覆の
表面構造の代表例を示すものであり、図１は実施例１、
図２は実施例６、図３は実施例１８で得た各被覆の表面
外観を示す顕微鏡写真（複写）を示している。From Tables 1 and 2, the following can be considered. Examples 1 to 19 satisfy all the specified requirements of the present invention, all have good water wettability and have a smaller contact angle than the comparative example, and the surface structure of these coatings has one side as described later. Within a 10 μm square field of view, a diameter of 0.1 to 0.1
100 or more fine particles of 1 μm exist in a non-contact state with each other or all or part of them are joined or contacted,
A hydrophilic coating having fine irregularities is formed on the surface. Incidentally, FIGS. 1 to 3 show a representative example of the surface structure of the surface coating obtained in the above-mentioned Examples, and FIG.
FIG. 2 shows a photomicrograph (copy) showing the surface appearance of each coating obtained in Example 6 and FIG.
【００３９】これらに対して比較例１〜７は、表面被覆
用組成物が本発明で定める必須構成成分の１つを欠くも
のであり、水濡れ性が悪く且つ接触角も実施例に比べて
非常に大きい値を示しており、また表面構造は、図４
（比較例７）に示す如く表面には微粒子の存在が全く認
められず凹凸のないほぼ平坦なものであった。On the other hand, in Comparative Examples 1 to 7, the surface coating composition lacks one of the essential constituents defined in the present invention, has poor water wettability and has a contact angle as compared with the Examples. It shows a very large value, and the surface structure is shown in FIG.
As shown in (Comparative Example 7), the presence of fine particles was not recognized at all on the surface, and the surface was substantially flat with no irregularities.
【００４０】[0040]
【発明の効果】以上述べた如く本発明によれば、基材表
面に微粒子に由来する微細な凹凸を無数に有する被覆を
形成することによって、表面の水濡れ性を高めて水膜形
成を容易にし、水滴としての付着をなくしたので、熱交
換器用フィン材等として使用した時の凝縮水の流下が著
しく促進されて圧損を可及的に少なくすることができ、
また本発明の表面被覆用組成物によれば、この様な親水
性で水濡れ性の非常に高い特殊な表面構造の表面被覆
を、様々の基材表面に簡単に形成することができる。As described above, according to the present invention, by forming a coating having innumerable fine irregularities derived from fine particles on the surface of a base material, water wettability of the surface is enhanced and a water film is easily formed. Since the adhesion as water droplets has been eliminated, the flow of condensed water when used as a fin material for heat exchangers is significantly promoted and pressure loss can be reduced as much as possible.
Further, according to the surface coating composition of the present invention, such a surface coating having a special surface structure which is hydrophilic and has a very high water wettability can be easily formed on various substrate surfaces.
【図１】実施例で得た表面被覆の表面構造を示す図面代
用顕微鏡写真である。FIG. 1 is a drawing-substituting micrograph showing the surface structure of a surface coating obtained in Examples.
【図２】実施例で得た表面被覆の表面構造を示す図面代
用顕微鏡写真である。FIG. 2 is a drawing-substitute micrograph showing a surface structure of a surface coating obtained in an example.
【図３】実施例で得た表面被覆の表面構造を示す図面代
用顕微鏡写真である。FIG. 3 is a drawing-substituting micrograph showing the surface structure of the surface coatings obtained in Examples.
【図４】比較例で得た表面被覆の表面構造を示す図面代
用顕微鏡写真である。FIG. 4 is a drawing-substitute micrograph showing the surface structure of a surface coating obtained in a comparative example.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 神谷 憲一 栃木県真岡市鬼怒ケ丘15番地 株式会社神 戸製鋼所真岡製造所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kenichi Kamiya 15 Kinugaoka, Moka City, Tochigi Prefecture Kamido Steel Works Moka Works
Claims (6)
成されると共に、該被覆表面には、一辺１０μｍの正方
形視野内に、直径０．１〜１μｍの微粒子が１００個以
上相互に非接触状態またはその全部もしくは一部が接合
もしくは接触して存在し、表面に微細な凹凸を有する親
水性被覆が形成されたものであることを特徴とする表面
被覆物。1. A coating layer containing a hydrophilic resin is formed on the surface of a base material, and 100 or more fine particles each having a diameter of 0.1 to 1 μm are mutually formed in a square field of view of 10 μm on a side. A surface-coated article, which is in a non-contact state or in which all or part thereof is joined or in contact with each other, and a hydrophilic coating having fine irregularities is formed on the surface thereof.
使用される金属材である請求項１に記載の表面被覆物。2. The surface coating according to claim 1, wherein the base material is a metal material used as a heat exchange member for a heat exchanger.
（メタ）アクリル酸系ポリマー、セルロース系ポリマ
ー、ポリりん酸系化合物および架橋剤を構成要素として
含むものである請求項１または２に記載の表面被覆物。3. The coating layer having fine particles on its surface contains a poly (meth) acrylic acid-based polymer, a cellulose-based polymer, a polyphosphoric acid-based compound and a crosslinking agent as constituent elements. Surface coating.
含む） 界面活性剤 ：３部以下（０部を
含む） を構成要素として含有するものである請求項３に記載の
表面被覆物。4. The coating layer comprises, by weight ratio, poly (meth) acrylic acid-based polymer: 0.3 to 5 parts, cellulose-based polymer: 0.3 to 3 parts, polyphosphoric acid-based compound: 1 to 7 parts, crosslinking agent: 0.3 to 3 parts Water-soluble organic polymer other than the above: 5 parts or less (including 0 part) Surfactant: 3 parts or less (including 0 part) as a constituent element The surface coating described.
ルロース系ポリマー、ポリりん酸系化合物および架橋剤
を必須成分として含有することを特徴とする親水性付与
のための表面被覆用組成物。5. A surface-coating composition for imparting hydrophilicity, which contains a poly (meth) acrylic acid-based polymer, a cellulose-based polymer, a polyphosphoric acid-based compound, and a crosslinking agent as essential components.
重量％を含む） 界面活性剤 ：３重量％以下（０
重量％を含む） が分散乃至溶解されたものである請求項５に記載の表面
被覆用組成物。6. In an aqueous solvent poly (meth) acrylic acid type polymer: 0.3 to 5% by weight cellulose type polymer: 0.3 to 3% by weight polyphosphoric acid type compound: 1 to 7% by weight crosslinking agent: 0.3 to 3 wt% Water-soluble organic polymer other than the above: 5 wt% or less (0
Surfactant: 3 wt% or less (0% included)
The surface coating composition according to claim 5, wherein the composition is dispersed or dissolved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00785394A JP3379190B2 (en) | 1994-01-27 | 1994-01-27 | Surface coating having hydrophilic coating formed thereon and composition for surface coating for imparting hydrophilicity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP00785394A JP3379190B2 (en) | 1994-01-27 | 1994-01-27 | Surface coating having hydrophilic coating formed thereon and composition for surface coating for imparting hydrophilicity |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07216259A true JPH07216259A (en) | 1995-08-15 |
| JP3379190B2 JP3379190B2 (en) | 2003-02-17 |
Family
ID=11677193
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP00785394A Expired - Lifetime JP3379190B2 (en) | 1994-01-27 | 1994-01-27 | Surface coating having hydrophilic coating formed thereon and composition for surface coating for imparting hydrophilicity |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3379190B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100763741B1 (en) * | 2005-06-28 | 2007-10-05 | 주식회사 엘지화학 | Manufacturing methods of ultra hydrophilic surface |
| JP2009249426A (en) * | 2008-04-02 | 2009-10-29 | Mitsubishi Alum Co Ltd | Coating material composition, fin and heat exchanger |
| JP2009256399A (en) * | 2008-04-11 | 2009-11-05 | Mitsubishi Alum Co Ltd | Coating composition, fin and heat exchanger |
| WO2011025035A1 (en) * | 2009-08-31 | 2011-03-03 | 日新化成株式会社 | Coating composition |
-
1994
- 1994-01-27 JP JP00785394A patent/JP3379190B2/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100763741B1 (en) * | 2005-06-28 | 2007-10-05 | 주식회사 엘지화학 | Manufacturing methods of ultra hydrophilic surface |
| JP2009249426A (en) * | 2008-04-02 | 2009-10-29 | Mitsubishi Alum Co Ltd | Coating material composition, fin and heat exchanger |
| JP2009256399A (en) * | 2008-04-11 | 2009-11-05 | Mitsubishi Alum Co Ltd | Coating composition, fin and heat exchanger |
| WO2011025035A1 (en) * | 2009-08-31 | 2011-03-03 | 日新化成株式会社 | Coating composition |
| JP5730205B2 (en) * | 2009-08-31 | 2015-06-03 | 日新化成株式会社 | Coating composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3379190B2 (en) | 2003-02-17 |
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