JP5006758B2 - Metal surface treatment agent - Google Patents

Metal surface treatment agent Download PDF

Info

Publication number
JP5006758B2
JP5006758B2 JP2007278684A JP2007278684A JP5006758B2 JP 5006758 B2 JP5006758 B2 JP 5006758B2 JP 2007278684 A JP2007278684 A JP 2007278684A JP 2007278684 A JP2007278684 A JP 2007278684A JP 5006758 B2 JP5006758 B2 JP 5006758B2
Authority
JP
Japan
Prior art keywords
surface treatment
treatment agent
metal surface
polymer
polymerization
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.)
Active
Application number
JP2007278684A
Other languages
Japanese (ja)
Other versions
JP2009108111A (en
Inventor
裕治 吉田
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.)
DKS CO. LTD.
Original Assignee
DKS CO. 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 DKS CO. LTD. filed Critical DKS CO. LTD.
Priority to JP2007278684A priority Critical patent/JP5006758B2/en
Publication of JP2009108111A publication Critical patent/JP2009108111A/en
Application granted granted Critical
Publication of JP5006758B2 publication Critical patent/JP5006758B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Paints Or Removers (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Graft Or Block Polymers (AREA)

Description

本発明は、アルミニウムなどの金属表面に、耐食性及び親水性を有する皮膜を形成させる親水性の金属表面処理剤に関する。   The present invention relates to a hydrophilic metal surface treatment agent that forms a film having corrosion resistance and hydrophilicity on a metal surface such as aluminum.

近年、冷房、除湿、さらには冷暖房兼用空調機が普及し、これらの空調機の熱交換部には、軽量で優れた加工性および熱伝導性を有することから、一般にアルミニウムもしくはアルミニウム合金製のフィンが使用されている。   In recent years, air conditioning combined with air conditioning, dehumidification, and air conditioning has become widespread, and heat exchange parts of these air conditioners are generally lightweight and have excellent workability and thermal conductivity. Is used.

空調機の冷房運転時、フィン表面には空気中の水分が凝縮水として付着する。アルミニウムやその合金は本来耐食性に優れているが、凝縮水がフィン表面に長時間滞留すると、酸素濃淡電池が形成され、また大気中の汚染成分が次第に濃縮される結果、腐食反応が促進される。これにより生じる腐食生成物はフィン表面に堆積し、熱交換特性を害するのみならず、冬期の暖房運転時に、白い微粉となって送風機より温風と共に排出されて室内の空気を汚染する。   During the cooling operation of the air conditioner, moisture in the air adheres to the fin surface as condensed water. Aluminum and its alloys are inherently excellent in corrosion resistance, but if condensed water stays on the fin surface for a long time, an oxygen concentration cell is formed, and as a result of gradually concentrating pollutants in the atmosphere, the corrosion reaction is accelerated. . Corrosion products generated thereby accumulate not only on the surface of the fins, but also impair heat exchange characteristics, and in the winter heating operation, they become white fine powder and are discharged together with warm air from the blower to contaminate indoor air.

このような問題を防止するために、フィン表面に耐食性及び親水性を有する皮膜を形成させる金属表面処理剤が提案されている。例えば、下記特許文献1には、アニオン性および/またはノニオン性基を有する変性ポリビニルアルコールにビニル化合物をマイケル付加した親水性の金属表面処理剤が開示されている。また、特許文献2では、ポリオキシエチレン鎖を有する水溶性有機化合物、スルホン酸基などを有する親水性ポリマーに、ポリビニルアルコール、ポリビニルアルコールの水溶性誘導体、および特定の水溶性ポリマーを含有する金属材料の親水性化用水性処理剤が記載されている。
特開平10−36757号公報 特開平9−316434号公報
In order to prevent such a problem, a metal surface treatment agent that forms a film having corrosion resistance and hydrophilicity on the fin surface has been proposed. For example, Patent Document 1 below discloses a hydrophilic metal surface treatment agent in which a vinyl compound is Michael-added to a modified polyvinyl alcohol having an anionic and / or nonionic group. In Patent Document 2, a water-soluble organic compound having a polyoxyethylene chain, a hydrophilic polymer having a sulfonic acid group and the like, polyvinyl alcohol, a water-soluble derivative of polyvinyl alcohol, and a metal material containing a specific water-soluble polymer An aqueous treatment agent for hydrophilization is described.
JP 10-36757 A JP-A-9-316434

しかしながら、上記従来の金属表面処理技術では、十分な親水性及び耐食性を有し、さらには臭気の発生しない皮膜は得られていない。   However, the conventional metal surface treatment technique described above has not obtained a film having sufficient hydrophilicity and corrosion resistance and further generating no odor.

本発明は、かかる問題に鑑みてなされたもので、親水性、耐食性、耐水性が良好で、かつ不快臭を発生しない熱交換器フィン用に好適に用いることができる、親水性皮膜を形成するための金属表面処理剤を提供することを目的とする。   The present invention has been made in view of such problems, and forms a hydrophilic film that can be suitably used for heat exchanger fins that have good hydrophilicity, corrosion resistance, and water resistance and do not generate unpleasant odors. An object of the present invention is to provide a metal surface treatment agent.

本発明者は、上記の課題を解決するべく鋭意検討した結果、ポリビニルアルコールにビニルピロリドンがグラフトした重合体が目的とする表面処理剤を製造する上で極めて有用であることを見出し、本発明を完成するに至った。   As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that a polymer obtained by grafting vinylpyrrolidone to polyvinyl alcohol is extremely useful in producing the intended surface treatment agent. It came to be completed.

すなわち、本発明は、ポリビニルアルコールにビニルピロリドンがグラフト重合した重合体を含有してなることを特徴とする金属表面処理剤である。   That is, the present invention is a metal surface treatment agent characterized by containing a polymer obtained by graft polymerization of polyvinyl pyrrolidone to polyvinyl alcohol.

本発明においては、上記金属表面処理剤に、架橋剤を含有することが好ましい。   In the present invention, the metal surface treatment agent preferably contains a crosslinking agent.

また、上記金属表面処理剤は、重合度が100〜4000であり、けん化度が70〜100mol%であるポリビニルアルコールにビニルピロリドンがグラフト重合した、K値が12〜150である重合体を含有することが好ましい。   Further, the metal surface treatment agent contains a polymer having a K value of 12 to 150 obtained by graft polymerization of vinyl pyrrolidone to polyvinyl alcohol having a polymerization degree of 100 to 4000 and a saponification degree of 70 to 100 mol%. It is preferable.

本発明に係る金属表面処理剤は、前記ポリビニルアルコールにビニルピロリドンがグラフト重合した重合体が、ポリビニルアルコール溶液にビニルピロリドンを配合し、開始剤として過酸化水素、有機過酸化物又はアゾ化合物を用いて重合して得ることができる。   In the metal surface treatment agent according to the present invention, the polymer obtained by graft polymerization of polyvinyl pyrrolidone on the polyvinyl alcohol is blended with vinyl pyrrolidone in the polyvinyl alcohol solution, and hydrogen peroxide, an organic peroxide or an azo compound is used as an initiator. Can be obtained by polymerization.

本発明の表面処理剤によれば、金属材料、特にアルミニウム含有金属材料の表面に適用することにより、良好な親水性、耐水性を有するのみならず、臭気が著しく抑制され、また耐食性も良好な親水性皮膜を金属表面に形成することができる。   According to the surface treatment agent of the present invention, when applied to the surface of a metal material, particularly an aluminum-containing metal material, not only has good hydrophilicity and water resistance, but also the odor is remarkably suppressed and the corrosion resistance is also good. A hydrophilic film can be formed on the metal surface.

本発明の金属表面処理剤に含有される重合体は、ポリビニルアルコール(以下、PVAと表記する場合もある)にビニルピロリドン(N−ビニル−2−ピロリドン)(以下、VPと表記する場合もある)をグラフト重合したものである。   The polymer contained in the metal surface treatment agent of the present invention may be expressed as polyvinyl pyrrolidone (N-vinyl-2-pyrrolidone) (hereinafter referred to as VP) to polyvinyl alcohol (hereinafter also referred to as PVA). ).

本発明で用いるグラフト重合体の原料となるPVAは、重合度が100〜4000であることが好ましく、100〜3000であることがより好ましい。重合度が100未満であると十分な皮膜強度が得られなくなり、4000を超えると高粘度となり作業性が低下する。   PVA used as a raw material for the graft polymer used in the present invention preferably has a degree of polymerization of 100 to 4000, and more preferably 100 to 3000. When the degree of polymerization is less than 100, sufficient film strength cannot be obtained, and when it exceeds 4000, the viscosity becomes high and workability decreases.

PVAのけん化度は70〜100mol%であることが好ましい。けん化度が70mol%未満では皮膜の強度が弱くなる場合がある。   The degree of saponification of PVA is preferably 70 to 100 mol%. If the degree of saponification is less than 70 mol%, the strength of the film may be weakened.

グラフト重合体のK値は12〜150であることが好ましい。K値とは、ドイツの化学者フィケンチャーにより提案された重合度を表わす定数であり、K値が12未満では皮膜の強度が弱くなり、150を超えると高粘度となり作業性が低下する。   The K value of the graft polymer is preferably 12 to 150. The K value is a constant representing the degree of polymerization proposed by the German chemist Fikencher. When the K value is less than 12, the strength of the film becomes weak, and when it exceeds 150, the viscosity becomes high and the workability decreases.

グラフト重合体におけるVPの量は、PVAに対して5〜900重量%であることが好ましい。5重量%未満であると充分な親水性が得られず、900重量%を超えると、皮膜の強度が低下する傾向がある。   The amount of VP in the graft polymer is preferably 5 to 900% by weight with respect to PVA. If it is less than 5% by weight, sufficient hydrophilicity cannot be obtained, and if it exceeds 900% by weight, the strength of the film tends to be lowered.

本発明の表面処理剤は皮膜とした場合に、上記グラフト重合体を5重量%以上含有することが好ましい。5重量%未満であると本発明の目的とする効果が得られ難くなる。   The surface treatment agent of the present invention preferably contains 5% by weight or more of the graft polymer when formed into a film. If it is less than 5% by weight, it is difficult to obtain the intended effect of the present invention.

前記グラフト重合体は、重合反応器中で、PVA溶液にVPを配合し、適当なラジカル重合開始剤を用いてPVA鎖にVPをグラフト重合する製造方法により得ることができる。   The graft polymer can be obtained by a production method in which VP is blended into a PVA solution in a polymerization reactor and VP is graft-polymerized to a PVA chain using an appropriate radical polymerization initiator.

重合開始剤としてはラジカル重合に通常用いられる過酸化水素、有機過酸化物又はアゾ系開始剤などを用いることができる。有機過酸化物の例としては、tert−ブチルハイドロパーオキシド、ジ−tert−ブチルパーオキシド、ベンゾイルパーオキシド等が挙げられる。アゾ化合物としては、2,2’−アゾビスイソブチロニトリル、2,2’−アゾビス(2−メチルブチロニトリル)、2,2’−アゾビス(2,4−ジメチルバレロニトリル)、2,2’−アゾビス(4−メトキシ−2,4−ジメチルバレロニトリル)等が挙げられる。反応方法及び反応条件は一般的なラジカル重合の例に従って選択すればよい。   As the polymerization initiator, hydrogen peroxide, an organic peroxide, an azo initiator, or the like that is usually used for radical polymerization can be used. Examples of the organic peroxide include tert-butyl hydroperoxide, di-tert-butyl peroxide, benzoyl peroxide and the like. As the azo compound, 2,2′-azobisisobutyronitrile, 2,2′-azobis (2-methylbutyronitrile), 2,2′-azobis (2,4-dimethylvaleronitrile), 2, And 2'-azobis (4-methoxy-2,4-dimethylvaleronitrile). What is necessary is just to select the reaction method and reaction conditions according to the example of general radical polymerization.

本発明の金属表面処理剤には、耐水性を向上させる目的で架橋剤を用いることが好ましい。架橋剤としては、エピクロロヒドリン、グリオキザール類、尿素系化合物、メラミン系化合物、グリシジル化合物、イソシアネート化合物、ホルマリン、アルデヒド類、硼酸、硼砂などの硼酸系化合物、塩化アルミニウム、硫酸アルミニウム、酢酸アルミニウム、硫酸亜鉛などの無機金属塩などが挙げられる。このうち、反応性、皮膜強度、耐水性付与の点でイソシアネート化合物が好ましい。中でも、加熱によって解離するブロック化剤でブロックされたブロック化イソシアネートが好ましい。   In the metal surface treatment agent of the present invention, a crosslinking agent is preferably used for the purpose of improving water resistance. As the crosslinking agent, epichlorohydrin, glyoxal, urea compound, melamine compound, glycidyl compound, isocyanate compound, formalin, aldehydes, boric acid compounds such as boric acid and borax, aluminum chloride, aluminum sulfate, aluminum acetate, Examples thereof include inorganic metal salts such as zinc sulfate. Among these, an isocyanate compound is preferable in terms of reactivity, film strength, and water resistance. Among these, a blocked isocyanate blocked with a blocking agent that dissociates by heating is preferable.

これらは通常、水に溶解もしくは分散した状態で安定に存在し、熱交換器フィンの表面に塗布したのち、熱をかけると、ブロック化剤が解離し、そこで上記グラフト重合体と架橋反応して、親水性、耐水性のある皮膜が形成される。   These usually exist stably in a state of being dissolved or dispersed in water, and when applied to the surface of the heat exchanger fins, when heated, the blocking agent is dissociated and there is a crosslinking reaction with the graft polymer. A film having hydrophilicity and water resistance is formed.

架橋剤の添加量は、グラフト重合体の固形分に対し0.1〜50重量%であり、好ましくは1.0〜30重量%である。0.1%以下では十分な耐水性が得られない場合があり、一方、50%を超えると親水性が低下する場合がある。   The addition amount of the crosslinking agent is 0.1 to 50% by weight, preferably 1.0 to 30% by weight, based on the solid content of the graft polymer. If the content is less than 0.1%, sufficient water resistance may not be obtained. On the other hand, if it exceeds 50%, the hydrophilicity may decrease.

本発明の金属表面処理剤は、上記成分以外に、界面活性剤、防カビ剤、防腐剤等を含有してもよい。   The metal surface treating agent of the present invention may contain a surfactant, an antifungal agent, an antiseptic, and the like in addition to the above components.

界面活性剤としては、ノニオン系、カチオン系及びアニオン系があるが、親水性の持続性及び塗布作業性の観点からアニオン系が好ましい。アニオン系界面活性剤としては、アルキルベンゼンスルホン酸ナトリウム、アルキルジフェニルエーテルジスルホン酸ナトリウム、アルキルナフタレンスルホン酸ナトリウム、ナフタレンスルホン酸−ホルマリン縮合物のナトリウム塩等を使用することができる。アニオン系界面活性剤の添加量は1〜10重量部であり、1重量部未満であると添加効果が十分に得られず、10重量部を超えると耐水性が低下する。   As the surfactant, there are a nonionic type, a cationic type and an anionic type, and an anionic type is preferable from the viewpoint of hydrophilic durability and coating workability. As an anionic surfactant, sodium alkylbenzenesulfonate, sodium alkyldiphenyl ether disulfonate, sodium alkylnaphthalenesulfonate, sodium salt of naphthalenesulfonic acid-formalin condensate and the like can be used. The addition amount of the anionic surfactant is 1 to 10 parts by weight, and if it is less than 1 part by weight, the effect of addition cannot be sufficiently obtained, and if it exceeds 10 parts by weight, the water resistance is lowered.

防カビ剤及び防腐剤としては、第4級アンモニウム塩、含窒素硫黄化合物、含ハロゲン窒素硫黄化合物、1,2−ベンズイソチアゾリン−3−オン(BIT)、有機ヨウ素系化合物、ベンズイミダゾール系化合物等を使用することができる。添加量は0.15〜1.5重量部が好ましい。   Antifungal agents and antiseptics include quaternary ammonium salts, nitrogen-containing sulfur compounds, halogen-containing nitrogen sulfur compounds, 1,2-benzisothiazolin-3-one (BIT), organic iodine compounds, benzimidazole compounds, etc. Can be used. The addition amount is preferably 0.15 to 1.5 parts by weight.

本発明の金属表面処理剤が適用される金属材料の材種、寸法、形状などに制限はないが、一般に熱交換器、およびアルミニウム含有金属材料(板材、棒材、管材など)、特にアルミニウム含有金属材料に適用することが好ましい。アルミニウム含有金属材料は、アルミニウム、アルミニウム合金(Al−Mn、Al−Mg、Al−Si合金など)材料から選ぶことができる。   There are no restrictions on the type, size, shape, etc. of the metal material to which the metal surface treatment agent of the present invention is applied, but generally heat exchangers and aluminum-containing metal materials (plate materials, rods, pipes, etc.), especially aluminum-containing materials It is preferable to apply to a metal material. The aluminum-containing metal material can be selected from aluminum and aluminum alloy (Al-Mn, Al-Mg, Al-Si alloy, etc.) materials.

本発明の金属表面処理剤による表面処理方法は、特に限定されないが、例えば下記方法が例示できる。   Although the surface treatment method by the metal surface treating agent of this invention is not specifically limited, For example, the following method can be illustrated.

まず表面処理剤塗布に先だって、下地処理を行う。下地処理としては、溶剤もしくはアルカリ溶液等を用いて脱脂処理を行う。溶剤としては、トリクロルエチレン、パークロルエチレン、ガソリン、ノルマルヘキサン等、アルカリ溶液としては、水酸化ナトリウム、炭酸ナトリウム、ケイ酸ナトリウム、リン酸ナトリウム等の溶液が挙げられる。   First, before the surface treatment agent is applied, a ground treatment is performed. As the ground treatment, a degreasing treatment is performed using a solvent or an alkaline solution. Examples of the solvent include trichloroethylene, perchlorethylene, gasoline, and normal hexane. Examples of the alkaline solution include solutions of sodium hydroxide, sodium carbonate, sodium silicate, sodium phosphate, and the like.

上記脱脂処理後、化成処理により耐食性皮膜を形成する。耐食性皮膜は、クロメート処理により得ることができる。クロメート処理には、無水クロム酸と硫酸、硝酸、フッ酸、リン酸等に添加剤を加えて調整された処理液を用いる。   After the degreasing treatment, a corrosion resistant film is formed by chemical conversion treatment. The corrosion resistant film can be obtained by chromate treatment. In the chromate treatment, a treatment solution prepared by adding an additive to chromic anhydride and sulfuric acid, nitric acid, hydrofluoric acid, phosphoric acid or the like is used.

あるいはジルコニウム系処理剤による処理を行ってもよい。ジルコニウム系処理剤の例としては、ポリアクリル酸とジルコンフッ化物との混合物が挙げられる。   Or you may perform the process by a zirconium type processing agent. Examples of the zirconium-based treatment agent include a mixture of polyacrylic acid and zircon fluoride.

さらに脱脂処理後フェノール系プライマー塗装を施すことにより一層良好な耐食性を付与することができる。フェノール系プライマーとしては、レゾール型水溶性フェノール樹脂(フェノールとホルマリンとのアルカリ触媒下での初期重合物)が好ましい。   Furthermore, better corrosion resistance can be imparted by applying a phenol-based primer coating after the degreasing treatment. As the phenol-based primer, a resol-type water-soluble phenol resin (initial polymerized product of phenol and formalin under an alkali catalyst) is preferable.

以上の下地処理を施したアルミニウム材上に表面処理剤を塗布する。塗布には、ロールコート法、浸漬法、スプレー法、刷毛塗り法等が適宜使用できる。例えばロールコート法による場合、塗布後150〜240℃で10秒〜1分間乾燥することにより親水性皮膜が得られる。親水性皮膜の膜厚は0.05〜0.5g/mが好ましい。0.05g/m未満であると十分な親水性が得られず、一方0.5g/mを超えるとコスト高になり、しかもそれに見合う効果の向上が得られないために好ましくない。 A surface treatment agent is applied on the aluminum material that has been subjected to the above-described base treatment. For coating, a roll coating method, a dipping method, a spray method, a brush coating method, or the like can be used as appropriate. For example, in the case of a roll coating method, a hydrophilic film can be obtained by drying at 150 to 240 ° C. for 10 seconds to 1 minute after coating. The thickness of the hydrophilic film is preferably 0.05 to 0.5 g / m 2 . 0.05 g / m is a no sufficient hydrophilicity is obtained less than 2, whereas when it exceeds 0.5 g / m 2 becomes costly, yet not preferable for improvement of the effect corresponding thereto is not obtained.

以下、本発明を実施例により具体的に説明するが、本発明の範囲はこれに限定されるものではない。   Hereinafter, the present invention will be specifically described by way of examples, but the scope of the present invention is not limited thereto.

本発明の実施例1〜4に係るグラフト重合物1〜4を下記の方法により調製した。得られた重合物1〜4と比較例1、2に係る重合物5、6を用い、アルミニウム板に表面処理皮膜を形成し、下記性能評価を行った。   Graft polymers 1 to 4 according to Examples 1 to 4 of the present invention were prepared by the following method. Using the obtained polymers 1 to 4 and the polymers 5 and 6 according to Comparative Examples 1 and 2, a surface treatment film was formed on an aluminum plate, and the following performance evaluation was performed.

重合物1:純水800gにPVA(重合度200、けん化度98−99mol%)190gを溶解させ、次いでVP10g(対PVA 5.26wt%)を添加、混合し、窒素パージにより脱酸素を行った。続いて、反応系を70℃に温度調節した。これに1重量%硫酸銅10mg、28重量%アンモニア水1.0g及び30重量%過酸化水素水1.5gを添加し、重合を開始させた。重合中は温度を70〜80℃、アンモニアによりpH5.5〜6.5に維持し、30重量%過酸化水素水1.5gを15分おきに6回添加することで重合率は90%以上となった。続いて残存VP処理工程として30重量%過酸化水素水4gを添加し、アンモニア水によりpH5以上に保持しながら合計210分間反応させ、K値23の重合物1の20%水溶液を得た。   Polymer 1: Dissolved 190 g of PVA (polymerization degree 200, saponification degree 98-99 mol%) in 800 g of pure water, then added and mixed VP 10 g (vs. PVA 5.26 wt%), and deoxygenated by nitrogen purge. . Subsequently, the temperature of the reaction system was adjusted to 70 ° C. To this, 10 mg of 1 wt% copper sulfate, 1.0 g of 28 wt% aqueous ammonia and 1.5 g of 30 wt% aqueous hydrogen peroxide were added to initiate polymerization. During polymerization, the temperature is maintained at 70 to 80 ° C. and pH 5.5 to 6.5 with ammonia, and 1.5 g of 30% by weight hydrogen peroxide solution is added 6 times every 15 minutes so that the polymerization rate is 90% or more. It became. Subsequently, 4 g of 30 wt% aqueous hydrogen peroxide was added as a residual VP treatment step and reacted for a total of 210 minutes while maintaining the pH at 5 or higher with aqueous ammonia to obtain a 20% aqueous solution of polymer 1 having a K value of 23.

重合物2:PVA(重合度2400、けん化度98−99mol%)と、VP(対PVA 42.9wt%)を使用した以外は重合物1の調製方法と同様にして、K値31の重合物2の20%水溶液を得た。
重合物3:PVA(重合度500、けん化度72.5−74.5mol%)と、VP(対PVA 150wt%)を使用した以外は重合物1の調製方法と同様にして、K値40の重合物3の20%水溶液を得た。
Polymer 2: Polymer having a K value of 31 in the same manner as the preparation of Polymer 1 except that PVA (polymerization degree 2400, saponification degree 98-99 mol%) and VP (vs. PVA 42.9 wt%) were used. A 20% aqueous solution of 2 was obtained.
Polymer 3: PVA (polymerization degree 500, saponification degree 72.5-74.5 mol%) and VP (vs. PVA 150 wt%) were used in the same manner as the preparation method for polymer 1, and a K value of 40 A 20% aqueous solution of polymer 3 was obtained.

重合物4:PVA(重合度3500、けん化度87−89mol%)と、VP(対PVA 900wt%)を使用した以外は重合物1の調製方法と同様にして、K値94の重合物4の20%水溶液を得た。   Polymer 4: A PVA (polymerization degree 3500, saponification degree 87-89 mol%) and VP (vs. PVA 900 wt%) were used in the same manner as the preparation of polymer 1 except that polymer 4 having a K value of 94 A 20% aqueous solution was obtained.

重合物5:PVA(重合度3500、けん化度87−89mol%)の粉末。   Polymer 5: PVA (polymerization degree 3500, saponification degree 87-89 mol%) powder.

重合物6:ポリビニルピロリドン(K−30、K値30)の粉末。   Polymer 6: Polyvinylpyrrolidone (K-30, K value 30) powder.

[親水性表面処理皮膜の形成]
アルミニウム板を脱脂後、ジルコニウム系表面処理剤(「アロヂン1690/1691」、日本ペイント(株)製)をバーコート法により塗布し、150℃で15秒間乾燥し、ジルコニウムが5mg/mの耐食性皮膜を形成した。次に上記重合物を固形分で10重量%、架橋剤(エラストロンH−38:第一工業製薬(株)製)1重量%を含有する表面処理剤をバーコート法で塗布し、240℃で30秒間乾燥することにより親水性皮膜を形成した。親水性皮膜の膜厚は0.2g/mであった。なお、上記表面処理剤には、界面活性剤としてアルキルジフェニルエーテルジスルホン酸ナトリウムを上記成分の合計100部に対して5部、防カビ剤としてベンズイミダゾール系化合物及び含窒素硫黄系化合物を0.25部の割合でそれぞれ予め含有させた。
[Formation of hydrophilic surface treatment film]
After degreasing the aluminum plate, a zirconium-based surface treatment agent (“Allodyne 1690/1691”, manufactured by Nippon Paint Co., Ltd.) is applied by the bar coating method, dried at 150 ° C. for 15 seconds, and the corrosion resistance of zirconium is 5 mg / m 2 . A film was formed. Next, a surface treatment agent containing 10% by weight of the above polymer and 1% by weight of a cross-linking agent (Elastoron H-38: manufactured by Daiichi Kogyo Seiyaku Co., Ltd.) was applied by a bar coating method at 240 ° C. A hydrophilic film was formed by drying for 30 seconds. The film thickness of the hydrophilic film was 0.2 g / m 2 . In the surface treatment agent, sodium alkyldiphenyl ether disulfonate as a surfactant is 5 parts with respect to a total of 100 parts of the above components, and benzimidazole compound and nitrogen-containing sulfur compound are 0.25 parts as a fungicide. Each of them was previously contained at a ratio of

[性能評価]
得られた各親水性皮膜に対して、下記の通り、臭気試験、耐水性試験、親水性試験及び耐食性試験を行った。結果を表1に示す。
[Performance evaluation]
Each of the obtained hydrophilic films was subjected to an odor test, a water resistance test, a hydrophilicity test, and a corrosion resistance test as follows. The results are shown in Table 1.

(1)臭気試験
各親水性皮膜形成アルミニウム板(以下、単にサンプルという)を直接嗅ぐことにより臭気試験を行った。評価基準は以下の通りである。
◎:全く臭気を感じない
○:ほとんど臭気を感じない
△:明らかに臭気を感じる
×:強い臭気を感じる。
(1) Odor test An odor test was performed by directly sniffing each hydrophilic film-formed aluminum plate (hereinafter simply referred to as a sample). The evaluation criteria are as follows.
A: No odor is felt at all. B: Almost no odor is felt. Δ: An odor is clearly felt. X: A strong odor is felt.

(2)耐水性試験
各サンプルを水道水に24時間浸漬し、浸漬前後の皮膜量(重量)から次式により水溶解率を求めた。
水溶解率(%)=[(初期皮膜量−24時間浸漬後の皮膜量)÷初期皮膜量]×100
耐水性の評価基準は以下の通りである。
◎:水溶解率10%未満
○:水溶解率10%以上30%未満
△:水溶解率30%以上50%未満
×:水溶解率50%以上。
(2) Water resistance test Each sample was immersed in tap water for 24 hours, and the water dissolution rate was determined by the following equation from the coating amount (weight) before and after immersion.
Water dissolution rate (%) = [(initial film amount−film amount after immersion for 24 hours) ÷ initial film amount] × 100
The evaluation criteria for water resistance are as follows.
A: Water solubility of less than 10% B: Water solubility of 10% or more but less than 30% Δ: Water solubility of 30% or more but less than 50% x: Water solubility of 50% or more.

(3)親水性試験
各サンプルを流水(流水量5リットル/時間、水道水)に17時間さらし、次に80℃で7時間乾燥するサイクルを5回繰り返した後で、乾燥した親水性皮膜について、水滴の接触角測定を行った。水滴の接触角は、固液界面解析装置(Drop Master500:協和界面化学(株)製)により測定した。親水性の評価基準は以下の通りである。
◎:接触角20°未満
○:接触角20°以上30°未満
△:接触角30°以上40°未満
×:接触角40°以上。
(3) Hydrophilic test Each sample was exposed to running water (flowing amount 5 liters / hour, tap water) for 17 hours, and then dried at 80 ° C. for 7 hours. The contact angle of water droplets was measured. The contact angle of the water droplet was measured by a solid-liquid interface analyzer (Drop Master 500: manufactured by Kyowa Interface Chemical Co., Ltd.). The evaluation criteria for hydrophilicity are as follows.
A: Contact angle of less than 20 ° B: Contact angle of 20 ° or more and less than 30 ° Δ: Contact angle of 30 ° or more and less than 40 ° ×: Contact angle of 40 ° or more.

(4)耐食性試験
各サンプルに対してJIS−Z−2371に基く塩水噴霧試験を500時間行い、平面部における白錆発生の面積率で耐食性を評価した。評価基準は以下の通りである。
◎:白錆発生せず
○:白錆発生の面積率0%を越え10%未満
△:白錆発生の面積率10%以上50%未満
×:白錆発生の面積率50%以上。
(4) Corrosion resistance test Each sample was subjected to a salt spray test based on JIS-Z-2371 for 500 hours, and the corrosion resistance was evaluated by the area ratio of occurrence of white rust in the flat portion. The evaluation criteria are as follows.
A: White rust does not occur. B: White rust generation area ratio of over 0% and less than 10%. Δ: White rust generation area ratio of 10% or more and less than 50%. X: White rust generation area ratio of 50% or more.

Figure 0005006758
Figure 0005006758

本発明は、フィン表面の凝縮水付着による熱交換効率低下の問題解決に大きく寄与することができ、冷暖房兼用空調機等の熱交換部のアルミニウム、アルミニウム合金等の金属製ファンの表面処理に好適である。   The present invention can greatly contribute to solving the problem of a decrease in heat exchange efficiency due to the condensed water adhering to the fin surface, and is suitable for the surface treatment of a metal fan such as aluminum or aluminum alloy in a heat exchange part of an air conditioner combined with an air conditioner. It is.

Claims (4)

ポリビニルアルコールにビニルピロリドンがグラフト重合した重合体を含有してなることを特徴とする金属表面処理剤。   A metal surface treatment agent comprising a polymer obtained by graft polymerization of vinyl pyrrolidone to polyvinyl alcohol. さらに、架橋剤を含有することを特徴とする請求項1に記載の金属表面処理剤。   The metal surface treatment agent according to claim 1, further comprising a crosslinking agent. 重合度が100〜4000であり、けん化度が70〜100mol%であるポリビニルアルコールにビニルピロリドンがグラフト重合した、K値が12〜150である重合体を含有することを特徴とする請求項1又は2に記載の金属表面処理剤。   2. A polymer having a K value of 12 to 150, which is obtained by graft polymerization of vinylpyrrolidone to polyvinyl alcohol having a polymerization degree of 100 to 4000 and a saponification degree of 70 to 100 mol%. 2. The metal surface treatment agent according to 2. 前記ポリビニルアルコールにビニルピロリドンがグラフト重合した重合体が、ポリビニルアルコール溶液にビニルピロリドンを配合し、開始剤として過酸化水素、有機過酸化物又はアゾ化合物を用いて重合して得られたものであることを特徴とする請求項1〜3のいずれかに記載の金属表面処理剤。   A polymer obtained by graft-polymerizing vinyl pyrrolidone with polyvinyl alcohol is obtained by blending vinyl pyrrolidone with a polyvinyl alcohol solution and polymerizing using hydrogen peroxide, an organic peroxide or an azo compound as an initiator. The metal surface treating agent according to any one of claims 1 to 3.
JP2007278684A 2007-10-26 2007-10-26 Metal surface treatment agent Active JP5006758B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007278684A JP5006758B2 (en) 2007-10-26 2007-10-26 Metal surface treatment agent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007278684A JP5006758B2 (en) 2007-10-26 2007-10-26 Metal surface treatment agent

Publications (2)

Publication Number Publication Date
JP2009108111A JP2009108111A (en) 2009-05-21
JP5006758B2 true JP5006758B2 (en) 2012-08-22

Family

ID=40776963

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007278684A Active JP5006758B2 (en) 2007-10-26 2007-10-26 Metal surface treatment agent

Country Status (1)

Country Link
JP (1) JP5006758B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776750A (en) * 2014-01-09 2015-07-15 株式会社神户制钢所 Metal plate coated by resin and heat exchanger fin material comprising same

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010084896A1 (en) * 2009-01-21 2010-07-29 日本パーカライジング株式会社 Hydrophilizing agent for aluminum-containing metal material, hydrophilizing method, and hydrophilized aluminum-containing metal material
JP5663174B2 (en) * 2010-02-15 2015-02-04 日本パーカライジング株式会社 Aluminum or aluminum alloy material having surface treatment film and surface treatment method thereof

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2731988B2 (en) * 1991-06-12 1998-03-25 日本ペイント株式会社 Hydrophilic surface treatment agent, hydrophilic surface treatment bath, and hydrophilic surface treatment method
JPH1036757A (en) * 1996-07-23 1998-02-10 Dai Ichi Kogyo Seiyaku Co Ltd Hydrophilic surface treatment agent for heat exchanger fin
JP2006213840A (en) * 2005-02-04 2006-08-17 Dai Ichi Kogyo Seiyaku Co Ltd Polyvinyl alcohol-modified graft polymer, method for producing the same and inkjet recording medium containing the same
JP2007078857A (en) * 2005-09-12 2007-03-29 Dai Ichi Kogyo Seiyaku Co Ltd Photoresist composition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104776750A (en) * 2014-01-09 2015-07-15 株式会社神户制钢所 Metal plate coated by resin and heat exchanger fin material comprising same
CN104776750B (en) * 2014-01-09 2017-04-12 株式会社神户制钢所 Metal plate coated by resin and heat exchanger fin material comprising same

Also Published As

Publication number Publication date
JP2009108111A (en) 2009-05-21

Similar Documents

Publication Publication Date Title
KR100706972B1 (en) Heat exchanger made of aluminum alloy
JP5794512B2 (en) Corrosion-resistant treatment method for aluminum heat exchanger
JPH11131254A (en) Surface treatment of aluminum-containing metallic material
JP4102028B2 (en) Metal material hydrophilization treatment agent, hydrophilization treatment liquid, hydrophilization treatment method, metal material, and heat exchanger
JP3877264B2 (en) Method for manufacturing aluminum fin material and aluminum fin material manufactured by this method
EP3187271B1 (en) Method for coating aluminum fin material with hydrophilic film, aluminum fin material, and aluminum heat exchanger
JP5537233B2 (en) Corrosion-resistant treatment method for aluminum heat exchanger
JP4464076B2 (en) Crosslinkable fine particles, hydrophilic treatment agent, hydrophilic film coating method and hydrophilic film
JP2004270031A (en) Rust prevention coating agent and method of rust prevention processing
JP5006758B2 (en) Metal surface treatment agent
JP2574197B2 (en) Hydrophilizing surface treatment agent for aluminum heat exchanger and hydrophilizing surface treatment method
TW510832B (en) Method of producing an aluminum fin material and the aluminum fin material produced by the method
JP5616669B2 (en) Corrosion-resistant treatment agent for aluminum substrate, and corrosion-resistant treatment method for aluminum substrate using the same
KR20190090382A (en) A heat exchanger, and a method for processing a hydrophilic treatment of a heat exchanger
EP1254941A1 (en) Hydrophilizing agent, hydrophilizing fluid, and method of hydrophilizing
TW576867B (en) Highly anti-corrosive hydrophilic treating agent, treating solution and hydrophilic treatments composed thereof
JPH09316434A (en) Aqueous treating agent for converting metal material into hydrophilic metal material and treatment therefor
JP5180145B2 (en) Crosslinkable fine particles, hydrophilic treatment agent, hydrophilic film coating method and hydrophilic film
JPH1036757A (en) Hydrophilic surface treatment agent for heat exchanger fin
JPH086063B2 (en) Hydrophilic surface treatment agent and treatment method
JP2009179811A5 (en)
JPH101783A (en) Aluminum surface treating agent, treatment therefor and treated aluminum material
JP2731988B2 (en) Hydrophilic surface treatment agent, hydrophilic surface treatment bath, and hydrophilic surface treatment method
JPH08291269A (en) Treating composition for making substance hydrophilic and parts for heat exchanger made hydrophilic
JPH086064B2 (en) Hydrophilic surface treatment agent and treatment method

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20100416

TRDD Decision of grant or rejection written
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20120516

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20120522

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20120525

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20150601

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Ref document number: 5006758

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150