JPS58219969A - Method for painting long aluminum material - Google Patents

Abstract

PURPOSE:To obtain a paint coating with a uniform thickness without generating the lowering in finish property due to an air bubble and accumulating a large amount of amine, in a painting method using both of immersion and electrodeposition, by a method wherein an electrode is isolated by a porous membrane and the arrangement of the electrode and the setting condition of an object to be painted are specified. CONSTITUTION:A long Al material with a length of 1 or 2m being an object to be painted is vertically immersed into an immersion painting bath comprising an aqueous paint liquid having an electrode immersed into only the upper part thereof and immersion painting is carried out while a current is supplied between the electrode and the object to be painted. In this case, the electrode is isolated by a porous membrane such as ion exchange membrane to eliminate problems of an air bubble and amine. In addition, the electrode is immersed in a depth equal to or less than 1/2 of the distance from the surface of the paint liquid and the surface to be painted to attain the uniformization of a paint film thickness. Moreover, after the aforementioned current supply, the object to be painted is directly allowed to stand for 0.5min or more to be drawn up to improve the gloss of the paint film. Subsequently, the object to be painted is set for one min or more in an atmosphere with the concn. of a hydrophilic org. solvent of 100-1,500ppm at 20-40 deg.C to prevent the downflow of the paint film and, thereafter, cured under heating.

Description

【発明の詳細な説明】 本発明は、膜厚が均一で、しかもタレ、気泡跡、クマリ
などの発生が全く訴められない塗膜に仕上□げることが
可能な水性論料による長尺アルミニウム材の塗装方法に
関するものであゐ。DETAILED DESCRIPTION OF THE INVENTION The present invention is a long film coated with a water-based paint that can be finished with a coating film that has a uniform thickness and is completely free from sagging, bubble marks, dark spots, etc. This is related to the method of painting aluminum materials.

従来、長さが１ｍ以上の長尺アルミニウム材に塗料を塗
装する方法として、水性塗料を充填した塗装浴中に該ア
ルミニウム材を縦にして浸漬したのち引き上げるという
所謂浸漬塗装法が多く採用されている。この浸漬塗装法
は、噴霧塗装法および電着塗装法などに比べて、装置お
よび操作が簡単である。しかしながら、長尺アルミニウ
ム材を単に塗装浴中に浸漬し、引き上げただけでは、そ
の上端部の膜厚は下端部に比べて著しく薄く、塗装膜厚
が不均一であ為。これは、上端部に塗着した塗料が下方
に流れ落ちるためである。この欠陥を改良するために１
畏尺アルミニクムの浸漬および引き上げの速度、塗料粘
度などについて種々検討されているが満足する結果は得
られなかった。Conventionally, the so-called dip coating method, in which the aluminum material is vertically immersed in a coating bath filled with water-based paint and then pulled up, has been widely adopted as a method for coating long aluminum materials with a length of 1 m or more. There is. This dip coating method requires simpler equipment and operation than spray coating methods, electrodeposition coating methods, and the like. However, if a long aluminum material is simply immersed in a coating bath and pulled up, the film thickness at the upper end is significantly thinner than at the lower end, and the coating film thickness is uneven. This is because the paint applied to the upper end flows down. To improve this defect, 1
Various studies have been made regarding the dipping and pulling speed of aluminum, the viscosity of the paint, etc., but no satisfactory results have been obtained.

さらに、上記欠陥を解消する方法として、浸漬塗装−と
電着塗装とを併用した塗装法も公知である。Furthermore, as a method for eliminating the above-mentioned defects, a coating method using a combination of dip coating and electrodeposition coating is also known.

すなわち、水性塗料液内上部のみに電極を配置した浸漬
塗装浴中−被塗物（長尺アルミニウム材）を縦にして浸
漬し、該電極と該被塗物との間に電流を通じて該被塗物
の上端部を電着塗装によって塗装すると同時に１それよ
り下部の被塗面を浸漬塗装によって塗装して、上端部と
それより下部との膜厚不均衡を防止する塗装法である。That is, the object to be coated (a long aluminum material) is immersed vertically in an immersion coating bath in which an electrode is placed only above the water-based paint solution, and an electric current is passed between the electrode and the object to be coated. This is a coating method in which the upper end of an object is coated by electrodeposition, and at the same time the surface below it is coated by dip coating, thereby preventing an imbalance in film thickness between the upper end and the lower part.

本発明者等は上記の浸漬塗装と電着塗装とを併用した塗
装方法について詳細な検討を行なった結果、被塗物上端
部における塗着不良はほぼ改善できたが、依然として種
々の欠陥を有していることが判明した。例えば、通電中
Ｋｌｌ極からガス（水素ガス）が発生し、これが塗装浴
中で気泡となシ、塗装中および被塗物引き上げ中に該気
泡が塗膜に付着もしくは接触して、ｔｌｈ膜にタレや気
泡跡を生離するアミン（中和剤）が浴中に漸次蓄積する
ので、電着塗装による塗着効率が低下する。また、電着
塗装による塗膜の形成機構が浸漬塗装によるものと異な
るので、前者による塗膜のツヤは後者より劣り、塗膜み
観に差異が認められるのである。The inventors of the present invention conducted a detailed study on the above-mentioned coating method using both dip coating and electrodeposition coating, and as a result, the coating defects at the upper end of the object to be coated were almost completely improved, but there were still various defects. It turned out that it was. For example, gas (hydrogen gas) is generated from the Kll electrode during energization, which forms bubbles in the coating bath, and the bubbles adhere to or come into contact with the coating film during coating and lifting the object to be coated, resulting in the formation of the TLH film. The amine (neutralizing agent) that causes sagging and bubbles gradually accumulates in the bath, reducing the coating efficiency of electrodeposition coating. Furthermore, since the mechanism for forming a coating film by electrodeposition coating is different from that by dipping coating, the gloss of the coating film produced by the former is inferior to that of the latter, and a difference is observed in the appearance of the coating film.

さらに、被塗物下端部には浸漬塗装によって塗着した塗
料が流下してたまりを生じ、美観を損なうことがある。Furthermore, the paint applied by dip coating may flow down and accumulate on the lower end of the object to be coated, impairing its aesthetic appearance.

本発明は、浸漬塗装および電着塗装を併用した長尺アル
ミニウム材の塗装方法における上記した欠陥を解消し、
上端部から下噛部にいたる塗膜厚が均一で、気泡によっ
て仕上り性が低下されず、電着塗装塗膜部のツヤピケを
防止し、長期間連続塗装して本アミンが多量に蓄積せず
、しかも、被塗物下端部に塗料のたまりが生じない長尺
アルミニウム材の塗装法を提供することを目的とするも
のである。The present invention eliminates the above-mentioned defects in the method of coating long aluminum materials using both dip coating and electrodeposition coating,
The coating thickness is uniform from the top edge to the bottom edge, the finish is not degraded by air bubbles, the electrodeposited coating area is prevented from becoming glossy, and the amine does not accumulate in large amounts during continuous coating over long periods of time. Moreover, it is an object of the present invention to provide a method for coating a long aluminum material in which no paint accumulates at the lower end of the object to be coated.

すなわち、本発明は、水性塗料液内上部のみに電極を投
入した浸漬塗装浴中に、被塗物である長尺アルミニウム
材を縦にして浸漬し、該電極と該　　）被塗物との間に
電流を通じながら浸漬塗装したのち、該塗装浴から引き
上げて塗膜を加熱硬化させる長尺アルミニウム材の塗装
方法において、該電極を多孔質膿で隔離し、かつ該電極
を塗料液面から、被塗面との極間距離の１／２以内の深
さまで没入し、しかも、上記通電後、非通電下で０．５
分以上塗料液中に浸漬した後に引負上げ、次いで親水性
有機溶剤蒸気濃度が１００〜１５０００ｐｐｍで、温度
が２５〜４０℃であるツ囲り５中で１分以上セツティン
グしてから、塗膜を加熱硬化せしめることを特徴とする
長尺アルミニウム材の塗装方法に関するものである。That is, in the present invention, a long aluminum material to be coated is vertically immersed in a dip coating bath in which an electrode is placed only in the upper part of the water-based paint solution, and the distance between the electrode and the object to be coated is In this coating method for long aluminum materials, the electrodes are coated by dipping while passing an electric current through them, then removed from the coating bath and cured by heating. It is immersed to a depth of within 1/2 of the distance between the poles and the painted surface, and after the above-mentioned energization, 0.5
After being immersed in the paint solution for at least 1 minute, the paint is pulled up, and then set in a box 5 with a hydrophilic organic solvent vapor concentration of 100 to 15,000 ppm and a temperature of 25 to 40°C for at least 1 minute, and then coated. The present invention relates to a method for coating a long aluminum material, which is characterized by heating and curing the film.

本発明において、被塗物である長尺アルミニウム材（以
下、単に「被塗物」と略称する）を浸漬する浸漬塗装浴
槽は、深さが被塗物の縦の長さ以上であって、その内面
は電気的に絶縁されていることが好ましい。そして該塗
装浴槽内には電着塗装が可能な水性塗料が、被塗物の被
塗面部分を該塗料中に浸漬しうるように充填されている
。In the present invention, the dip coating bath in which the long aluminum material to be coated (hereinafter simply referred to as "the object to be coated") is immersed has a depth equal to or greater than the vertical length of the object to be coated, and Preferably, its inner surface is electrically insulated. The coating bath is filled with a water-based paint that can be electrodeposited so that the surface of the object to be coated can be immersed in the paint.

被塗物は建材もしくけ構築物などに用いられている線状
、棒状、型状、板状などの形を有する長さが１ｒｌＬ以
上、特に２ｆｉ以上の長尺のアルミニタムもしくけその
合金である。また、水性塗料は、それ自体公知の電着塗
装が可能な塗料であって、例Ａはアクリル枦脂、アルキ
ド樹脂、エポキシ樹脂、ジエン系樹脂、加工油などを主
骨格とするビヒクル成分を用いてなるアニオン系もしく
けカチオン系の塗料が好適であるが、本発明では特にこ
れらの組成に限定されない。The object to be coated is a long aluminum or aluminum alloy with a length of 1rlL or more, especially 2fi or more, and has a linear, rod-like, mold-like, plate-like, etc. shape and is used for building materials or structural structures. In addition, the water-based paint is a paint that can be electro-deposited, which is known per se, and Example A uses a vehicle component whose main skeleton is acrylic resin, alkyd resin, epoxy resin, diene resin, processing oil, etc. Although anionic or cationic paints are suitable, the present invention is not particularly limited to these compositions.

本発明において、電着塗装のための電極は、浸漬塗装浴
槽に入れた水性塗料液内上部のみに配置する必要がある
。すなわち、単なる浸漬塗装だけでは塗料液面近傍にあ
る被塗面への塗着が不十分となるので、その塗着不良部
分のみを電着塗装によ〜て塗装するのである。具体的に
は、該電極を、被塗物の長さに関係なく、塗装浴の塗料
液面を基準にして、被塗物から電極までの極間距離の１
／２ないし１／１０　（好ましくは１／２〜１１５）の
長さに相当する深さに至るまで没入するのである。例え
ば、本発明において上記極間距離は１０〜４０倒、特に
２０〜３５倒とすることが好ましいので、これにもとづ
くと、電極は塗料液面から、極間距離の１／２〜１／１
０に相当する１〜２０ｃＩｎの深さに至るまで没入させ
名ことが好すしい。さらに具体的傾け、極間距離を３０
ｃｒｎＫすると、電ｔｉｉＦｉ、塗料液面から１５〜３
倒、好ましくけ１５〜６−の深さまで没入させる必要が
ある。In the present invention, electrodes for electrodeposition need to be placed only in the upper part of the aqueous coating solution in the dip coating bath. In other words, since mere dip coating does not adequately coat the surface to be coated near the surface of the paint liquid, only those areas with poor coating are coated by electrodeposition. Specifically, the electrodes are connected at a distance of 1 of the distance between the electrodes from the object to be coated, based on the paint liquid level in the coating bath, regardless of the length of the object to be coated.
It is immersed to a depth corresponding to a length of 1/2 to 1/10 (preferably 1/2 to 115). For example, in the present invention, the distance between the electrodes is preferably 10 to 40 degrees, particularly 20 to 35 degrees.
It is preferable to immerse the liquid to a depth of 1 to 20 cIn, which corresponds to 0 cIn. More specifically, increase the distance between poles by 30
crnK, electric tiiFi, 15~3 from the paint liquid level
It is necessary to immerse it to a depth of preferably 15 to 6 degrees.

本発明において、電極をこのように配置し、該電極と被
塗物との間を通電して電着塗装すると、単なる浸漬塗装
では塗着が不十分な被塗物の上端部分への電着が十分に
行なわれ、しかも、それより下方になるにしたがって電
着塗装による塗着が漸減し、一方浸漬塗装による塗着が
漸増するので、全体さして均一な膜厚に塗装することが
できるのである。したがって、塗装浴に没入する電極の
深さが上記したよりも深くなると、浸漬塗装によって十
分に塗着できる被塗面にも電着塗装され、その部分の膜
厚が太き、くなるので好ましくなく、逆にｉｌ！極の没
入深さが上記したよりも浅くなると、本発明の目的が達
成できないめ□である。本発明において使用される電極
は導電性金属であればよく、具体的にはステンレス鋼、
アルミニウム合金が好また、本発明では、通電中忙電極
から発生するガスが気泡上なって被塗面に移行させない
ために、ｐｉｔｓを多孔質膜で隔離しておく必要がある
。電極から発生したガスが気泡きなって被塗面に移行す
ると、塗面に気泡跡や°タレ跡などを形成して好ましく
ないのである。該多孔質膜としては、例えばイオン交換
隔膜、帆布（ポリプロピレン製、ナイロン製、麻製、木
綿製）などがあげられ、これらは電極から発生するガス
が塗料液中で気泡となっても被塗物表面に移行しないよ
うに電極を隔離するのである。このうち、イオン交換隔
膜を用いると、長期間もしくは多量に塗装した場合、樹
脂（ビヒクル成分）の可溶化剤として用いたアミン（中
和剤）などの蓄積を防止できるので好ましい。In the present invention, when electrodes are arranged in this way and electricity is passed between the electrodes and the object to be coated to perform electrodeposition coating, electrodeposition occurs on the upper end of the object, where coating is insufficient with simple dip coating. Moreover, the amount of coating by electrodeposition gradually decreases as it goes lower, while the amount of coating by dip coating gradually increases, so it is possible to coat the entire surface with a uniform thickness. . Therefore, if the depth of the electrode immersed in the coating bath is deeper than the above-mentioned depth, the coating surface that can be sufficiently coated by dip coating will also be electrodeposited, and the film thickness in that area will become thicker, which is preferable. Not, on the contrary, il! If the immersion depth of the poles becomes shallower than the above-mentioned depth, the object of the present invention cannot be achieved. The electrode used in the present invention may be any conductive metal, specifically stainless steel,
In the present invention, in which aluminum alloy is preferred, it is necessary to isolate the pits with a porous membrane in order to prevent the gas generated from the active electrode from rising into bubbles and transferring to the surface to be coated. If the gas generated from the electrode bubbles and transfers to the coated surface, it will form undesirable bubble marks or sagging marks on the coated surface. Examples of such porous membranes include ion-exchange membranes and canvas (made of polypropylene, nylon, hemp, cotton), etc., and these can be coated even if the gas generated from the electrode forms bubbles in the paint solution. The electrodes are isolated to prevent migration to surfaces. Among these, it is preferable to use an ion exchange diaphragm because it can prevent accumulation of amine (neutralizing agent) used as a solubilizer for the resin (vehicle component) when coating for a long period of time or in large quantities.

本発Ｆ！Ａは、上記のごとく電極を配置してなる浸漬塗
装浴中に１被塗物を縦にして浸漬し、電着塗装および浸
漬塗装の両者によって塗装するのである。Original F! In method A, one object to be coated is immersed vertically in a dip coating bath in which electrodes are arranged as described above, and the coating is carried out by both electrodeposition coating and dip coating.

まず、塗装洛中における水性塗料の温度を２５〜４０℃
（好ましくけ３０〜４０℃）に調整し、かつ粘度を塗装
時において５〜１００センチボイズ（好ましくは１０〜
５０センチボイス）忙しておくことが好ましい。First, the temperature of the water-based paint during painting should be 25-40℃.
(preferably 30-40℃), and the viscosity is adjusted to 5-100 centivoise (preferably 10-100℃) during coating.
50 centimeter voice) It is preferable to stay busy.

一方、被塗物は、あらかじめ常法により、脱脂、エツチ
ング、電Ｍオたは化成処理のような前処理を行なってお
くトサが好ましい。脱脂は有機溶剤、界面活性剤などで
行なうことができ、エツチングはカセイソーダなどのア
ルカリ中に浸漬することによって行なえ、電解処理は無
機酸または有機酸などの水溶液に浸漬して電解酸化する
ことによって行なえ、そして化成処理はクロム酸、リン
酸またはこれらの塩類の水溶液中に浸漬することによっ
て行なえる。また、電解処理したものは熱水もしくけア
ンモニアアミン類を添加した熱水中に浸漬し、熱処理し
てもさしつかえない。On the other hand, it is preferable that the object to be coated be subjected to a pretreatment such as degreasing, etching, electric polishing, or chemical conversion treatment by a conventional method. Degreasing can be carried out using organic solvents, surfactants, etc., etching can be carried out by immersing it in an alkali such as caustic soda, and electrolytic treatment can be carried out by immersing it in an aqueous solution of an inorganic or organic acid and electrolytically oxidizing it. , and the chemical conversion treatment can be carried out by immersion in an aqueous solution of chromic acid, phosphoric acid, or their salts. Moreover, the electrolytically treated material may be heat-treated by immersing it in hot water or in hot water to which ammonia amines have been added.

そして、かかる前処理した被塗物を、塗装浴中に縦吊り
して浸漬したのち、次いで、該被塗物と電極との間に電
流を通じ、浸漬塗装と電着塗装とを行なうのである。ま
ず、塗装浴中への被塗物の浸漬速度は１〜１０ｆｉ／分
が好ましい。そして、浸漬終了後、被塗面２水性塗料と
のなじみをよくするために１非通舞下で０．５分以上、
好ましくは１〜５分浸漬してから通電することが好まし
い。After the pretreated object to be coated is vertically suspended and immersed in a coating bath, an electric current is then passed between the object to be coated and an electrode to perform dip coating and electrodeposition coating. First, the immersion rate of the object to be coated into the coating bath is preferably 1 to 10 fi/min. After dipping, the surface to be coated (2) should be soaked for at least 0.5 minutes without passing water in order to improve its compatibility with the water-based paint.
It is preferable to immerse it for 1 to 5 minutes before applying electricity.

次いで、電極と被塗物との間に５０〜２００ポルトの電
圧を印蓚し、０．５〜５分間通電を行な９て被塗物上端
部を電着塗装するのである。そして、電着塗装終了後、
通電を止め、０．５分以上、特に好ましくけ１〜５分そ
のままの状態で静置してから、０．５〜５　ｔｎ　７分
の速度で被塗物を塗装浴から引き上げるのである。通電
終了後、通電したまま被塗物を引き上げたり、あるいは
通電を止めてから浴中での被、塗物の静置時間が０．５
分よシ短かくなると、電着塗膜と浸漬塗装塗膜とのツヤ
などが異なるので好ましくない。Next, a voltage of 50 to 200 ports is applied between the electrode and the object to be coated, and electricity is applied for 0.5 to 5 minutes to electrocoat the upper end of the object. After finishing the electrodeposition coating,
After turning off the electricity and allowing the bath to stand still for at least 0.5 minutes, preferably 1 to 5 minutes, the object to be coated is pulled out of the coating bath at a speed of 0.5 to 5 tn/7 minutes. After energization, the object to be coated may be pulled up while the energization is applied, or the time for the object to be coated or the object to be coated to remain in the bath after the energization is stopped is 0.5.
If the length is too short, the gloss of the electrodeposition coating film and the dip coating coating film will be different, which is not preferable.

塗装浴から引き上げた被塗物の表面には均一な膜厚で塗
料が塗着しているが、時間の経過と共に上部から下部に
向かって塗料が流下し、下部の膜厚が増加し、さらにタ
レ等の異常（クマリ）を生ずるので、それ、を除去する
ために、本発明では、塗装浴から引き上げた被塗物を、
加熱乾燥工程に移す前に、親木性有機溶剤蒸気の濃度が
１００〜１５００”ｐ　ｐ　ｍで、かつ温度が２５〜４
０℃（好ましくけ３０〜４０℃）に保持された雰囲気中
に１１分間以上セツティングし、下部の過剰表塗料を落
下させることが必要である。該親水性有機溶剤は、前記
水性塗料の補助溶剤として用いることができるもの”で
あって、例えばブチルセロソルブ、ジメチルアミノエタ
ノール、ブチルカルピトール、イソプロピルアルコール
、エチレングリコールブチルエーテルなどがあげられる
。該雰囲気は、前記塗装を密閉状態で行なって、水性塗
料中に含まれている親水性有機溶剤の蒸気を捕集するこ
とＫよって容易に形成できる。該雰囲気における親水性
有機溶剤の蒸気濃度は１００〜１５０００ｐｐｍ。The paint is coated with a uniform thickness on the surface of the workpiece taken out of the paint bath, but as time passes, the paint flows down from the top to the bottom, and the film thickness at the bottom increases. In order to remove abnormalities such as sagging (sagging), in the present invention, the object to be coated that has been removed from the coating bath is
Before proceeding to the heat drying process, the concentration of the wood-loving organic solvent vapor is 100 to 1500"ppm, and the temperature is 25 to 4".
It is necessary to set it in an atmosphere maintained at 0°C (preferably 30-40°C) for 11 minutes or more to allow the excess surface paint at the bottom to fall off. The hydrophilic organic solvent is one that can be used as an auxiliary solvent for the water-based paint, and examples thereof include butyl cellosolve, dimethylaminoethanol, butyl calpitol, isopropyl alcohol, and ethylene glycol butyl ether.The atmosphere is It can be easily formed by performing the coating in a closed state and collecting the vapor of the hydrophilic organic solvent contained in the water-based paint.The vapor concentration of the hydrophilic organic solvent in the atmosphere is 100 to 15,000 ppm.

好ましくは５００〜５０００　ｐ　ｐｍであって、かつ
温度を２５〜４０℃Ｋｌｌ整しておく必要がある。Preferably it is 500 to 5000 ppm, and the temperature must be kept at 25 to 40°C.

親水性有機病剤蒸気濃度が１’　００　ｐｐｍより少な
くなると下部の過剰膜厚やタレ等の塗面異常および下端
のタマリを除去することが困難となシ、一方１５０００
ｐｐｍよシ多くなると浸漬塗装によって塗着せしめた目
的とする塗膜も流れ落ちるので好ましくない。また、２
５℃より低くなるとタマリを除去することが困難となり
、４０℃よシ高くなると塗着した塗料の表面乾燥が進ん
でタレなどの塗膜異常が発生するので好ましくない。さ
らに、該雰囲気におけゐセツティング時間は１分以上、
好ましくは１〜２０分間であって、１分よシ短かくなゐ
とタマリを十分に防止することができない。When the hydrophilic organic disease agent vapor concentration is less than 1'00 ppm, it becomes difficult to remove coating surface abnormalities such as excessive film thickness at the bottom, sagging, and sagging at the bottom;
If the amount exceeds ppm, the intended coating film applied by dip coating will also run off, which is undesirable. Also, 2
If the temperature is lower than 5°C, it will be difficult to remove the scum, and if the temperature is higher than 40°C, the surface of the applied paint will proceed to dry, causing paint film abnormalities such as sagging, which is undesirable. Furthermore, the setting time in the atmosphere is 1 minute or more,
Preferably, the time is 1 to 20 minutes, and if it is shorter than 1 minute, it will not be possible to sufficiently prevent sagging.

セツティングを行なったのち、加熱して塗膜を硬化させ
るのである。加熱は１３０〜２３０℃で、１０〜３０分
間行なわれるのである。その結果、本発明が目的とする
、厚さ３〜５０＃の均一塗膜が施された長尺アルミニウ
ムが得られるのである。After setting, the coating is cured by heating. Heating is carried out at 130-230°C for 10-30 minutes. As a result, a long aluminum coated with a uniform coating with a thickness of 3 to 50#, which is the object of the present invention, can be obtained.

本発明の塗装方法では電着塗装と浸漬塗装とを併用して
いるが、前者による塗装はごく一部であるために、後者
による塗装法自体が有する利点（塗装設備費がφ□く、
塗装浴の管理が比較的容易、塗装作業が簡単）のすべて
を享受でき、特に１塗装浴の管理は固形分含量（不揮発
分）および粘度−にもとづいて行なえばよく、電着塗装
浴の管理項目（例えば、ｐＨ１電導度、アミン濃度など
）を考慮する必要は殆どないのである。さらに、被塗物
の上端部から下端部にいたるまでの膜厚が均一であって
、下端部に塗料のタマリが認められず、し、かも電着塗
装によって塗着した部分と浸漬塗装によって塗着し九部
分とにおいて、ツヤなどの差異は全く認められないので
ある。The coating method of the present invention uses both electrodeposition coating and dipping coating, but since only a small portion of the coating is done by the former, the latter coating method itself has its own advantages (lower coating equipment costs,
You can enjoy all of the following (relatively easy to manage paint baths and simple painting work), and in particular, you can manage a single paint bath based on solid content (non-volatile content) and viscosity. There is almost no need to consider items (eg, pH 1 conductivity, amine concentration, etc.). Furthermore, the coating thickness is uniform from the top edge to the bottom edge of the object to be coated, and there are no lumps of paint on the bottom edge. There is no noticeable difference in shine or the like between the 9th part and the 9th part.

次ＫＳ実施例および比較例をあげて、本発明を更に説明
する。なお、部、％は重量にもとづいている。The present invention will be further explained with reference to the following KS Examples and Comparative Examples. Note that parts and percentages are based on weight.

実施例１ 長さ６情、巾１０ａ＋ｓ、厚さ１．５−のＪＩＳ　　Ｈ
４１００で規定されているＡ６０６３Ｓアルミニクム合
金押出形材を、工業用洗剤で脱脂し、５５亡に加温した
１０％カセイソーダ水溶液中に４分間浸漬してエツチン
グ処理したのち、陽極酸化処理し、次いで、９０〜９５
℃の温水に浸漬して封孔処理せしめたものを被塗物とし
た。Example 1 JIS H length: 6mm, width: 10a+s, thickness: 1.5-
An extruded A6063S aluminum alloy section specified in 4100 was degreased with an industrial detergent, etched by immersing it in a 10% caustic soda aqueous solution warmed over 55 minutes for 4 minutes, and then anodized. 90-95
The object to be coated was immersed in warm water at ℃ for pore sealing treatment.

一方、内面を絶縁した塗装浴槽に１水溶性のアクリル樹
脂およびメラミン樹脂をビヒクル成分とし、かつ親水性
有機溶剤さしてブチルセロソルブ２０％ニゲチルカルピ
トール２％およびイソプロピルアルコール１％を含有さ
せてなる不揮発分１５％の水性塗料を入れ、３５〜３７
℃に調整した。同温度における該塗料の粘度は３６セン
チボイズであった。On the other hand, a non-volatile component made of a painted bathtub with an insulated inner surface, 1 water-soluble acrylic resin and melamine resin as vehicle components, and hydrophilic organic solvents such as butyl cellosolve 20%, nigethyl calpitol 2% and isopropyl alcohol 1%. Add 15% water-based paint, 35-37
The temperature was adjusted to ℃. The viscosity of the paint at the same temperature was 36 centivoise.

次に１前記被塗物を縦にして上記塗装浴中に速度５ｍ／
分で、液面上に５ａ＋ｌＩｌすように浸漬し喪。Next, place the object to be coated vertically into the coating bath at a speed of 5 m/
For 5 minutes, immerse it so that it reaches 5a+lIl above the liquid surface.

該塗装浴には、長さ１６ｃｍのステンレス製電極を、塗
料液面上３αを残し液面から１３ｃｍの深さまで塗装浴
中に浸漬し、そして被塗物までの距離（極間距離）を３
０３にした。被塗物を浸漬してから塗料と被塗物表面と
をなじませるために１分間静置してから、上記電極を陰
極として１２０ボルトの直流電圧を印暮し、電流を１分
間通じた後、通電を止めて１．５分間静置し、次いでｌ
　ｍ　７分（の速度で被塗物を塗装浴から引き上げた。A stainless steel electrode with a length of 16 cm is immersed in the paint bath to a depth of 13 cm from the liquid surface, leaving 3 α above the paint liquid surface, and the distance to the object to be coated (distance between electrodes) is 3
I set it to 03. After the object to be coated is immersed and left to stand for one minute to blend the paint and the surface of the object, a DC voltage of 120 volts is applied using the above electrode as a cathode, and a current is passed for one minute. Turn off the electricity and let it stand for 1.5 minutes, then
The object to be coated was removed from the coating bath at a speed of 7 minutes.

なお、電極は、イオン交換樹脂からなる隔膜で隔離して
おいた。Note that the electrodes were isolated by a diaphragm made of ion exchange resin.

塗装浴から引き上げ九被塗物を、該塗装浴から揮散した
親水性有機溶剤の蒸気を捕集してなるセツティングゾー
ン（該有機溶剤蒸気濃度１３００ｐｐ”ｓ温度３４℃）
内でｌＯ分開放置し九のち、１７０℃で３０分間焼付け
た。A setting zone is formed by collecting the vapor of the hydrophilic organic solvent volatilized from the coating bath when the object to be coated is lifted from the coating bath (the organic solvent vapor concentration is 1300 pp''s and the temperature is 34°C).
After leaving it open for 10 minutes in a chamber, it was baked at 170° C. for 30 minutes.

実施例２ 水性塗料とじてアクリル樹脂−アルキド樹脂−メラミン
樹脂をビヒクル成分とする塗料を用い（その他の族１分
は実施例１と同じ）極間距離を２０５１１とし、電極を
塗料液面から１０５１の深さまで浸漬し、通電を止めて
からの静置時間を１分間とし、セツティングゾーンにお
ける親水性有機溶剤蒸気濃度を２０００　ｐｐｍＫＬ、
該セツティングゾーン内温度を３８℃にした以外は実施
例１と同様にして行なった。Example 2 A paint containing acrylic resin, alkyd resin, and melamine resin as vehicle components was used as a water-based paint (the other groups were the same as in Example 1), and the distance between electrodes was set to 20511, and the electrode was placed 1051 from the paint surface. The setting zone was immersed to a depth of 2000 ppmKL, and the setting time after turning off the electricity was 1 minute.
The same procedure as in Example 1 was carried out except that the temperature inside the setting zone was 38°C.

比較例１ 電極を隔膜で隔離し々い点を除いてすべて実施例１と同
様な条件で塗装を行なった。Comparative Example 1 Coating was carried out under the same conditions as in Example 1 except that the electrodes were separated by a diaphragm.

比較例２ 電極を塗料液面から２０ＣＩ＋＋の深さまで浸漬した以
外はすべて実施例１と同様な条件で塗装を行な−た。Comparative Example 2 Coating was carried out under the same conditions as in Example 1, except that the electrode was immersed to a depth of 20 CI++ from the paint liquid level.

比較例３ 通電を止めてから０．４分以内に被塗物を引き上げ九以
外は実施例１と同様な条件で塗装を行なった。Comparative Example 3 The object to be coated was pulled up within 0.4 minutes after the electricity was turned off, and coating was carried out under the same conditions as in Example 1, except for the following.

比較例４ 塗装浴から引き上げた被塗物を、溶剤蒸気を殆ど舎壕な
い（８０ｐｐｍ以下）雰囲気中（温度３４℃）で１０分
間セツティングした以外は実施例１と同様な条件で行な
った。Comparative Example 4 The coating was carried out under the same conditions as in Example 1, except that the object to be coated was taken out of the coating bath and set in an atmosphere (temperature 34° C.) with almost no solvent vapor (less than 80 ppm) for 10 minutes.

比較例５ 長さ２情、中ｌＯ副、厚さ１．５−のＡ　６０６３５ア
ルミニクム合金押出形材を、実施例１と同様Ｋ、表面処
理し、・実施例１で用いた塗装洛中（４０℃）Ｋ浸漬し
た。Comparative Example 5 A 60635 aluminum alloy extruded section with a length of 2 mm, a medium thickness, and a thickness of 1.5 mm was surface-treated with K and the same coating as in Example 1. °C) K immersion.

被塗物を塗装浴に４　ｍ　７分の速度で塗料液面上３倒
を残す深さに浸漬した。一方、長さ２０ｃＩＩ４のステ
ンレス製電極を塗料液面上３ｃｍを残す深さに浸漬し、
被塗物に陽極として極間距離１００１で５０ボルトの直
流電圧を印加し、３０秒間通電した。次いで、０．４分
以内に１．５ｔｎ１分の速度で被塗物を塗装浴から引き
上げ、常温で８分間液切シ、および中ツテイングしてか
ら、２００℃で２５分間焼付は九。The object to be coated was immersed in the coating bath at a speed of 4 m 7 minutes to a depth that left 3 increments above the surface of the paint liquid. On the other hand, a stainless steel electrode with a length of 20cII4 was immersed to a depth that left 3cm above the paint liquid level.
A DC voltage of 50 volts was applied to the object to be coated as an anode with a distance between the electrodes of 1001, and the current was applied for 30 seconds. Next, the object to be coated was taken out of the coating bath at a speed of 1.5 tons per minute within 0.4 minutes, drained and heated at room temperature for 8 minutes, and then baked at 200°C for 25 minutes.

性能試験結果 上記実施例および比較例で得た被塗物の塗膜性能は第１
表に示したとおりであった。Performance test results The coating film performance of the coated objects obtained in the above examples and comparative examples was the first.
It was as shown in the table.

（※１）膜゛厚：被塗物の各部分における塗膜の厚さを
測定した結果である。「上部」祉塗装浴中に没した被塗
物の最上部から下方へ１０ｃｙａまでの部分の平均膜厚
、「中部」は被塗物の中央部の縦方向１０ｍの範囲にお
ける平均膜厚、「上部」は被塗物の最下端から上方へ１
０ｍまでに至る部分の平均膜厚、「差」は測定し九膜厚
のうち最大厚さから最低厚さを差し引いた膜厚である。(*1) Film thickness: This is the result of measuring the thickness of the coating film in each part of the object to be coated. "Top" is the average film thickness of the part of the object submerged in the coating bath from the top to 10 cya downwards, "Middle" is the average film thickness in the 10 m vertical range of the center of the object, ""Top" is 1 upward from the bottom edge of the object to be coated.
The average film thickness of the portion up to 0 m, the "difference", is the film thickness obtained by subtracting the minimum thickness from the maximum thickness among the nine film thicknesses measured.

（壷２）塗面：形成した塗面の状態を目視によって観察
した結果であシ、「ツヤ」は電着塗装部分と浸漬塗装部
分とにツヤの差異の有無にりいて観察した結果であり、
「タマリ」は被塗物の最下端部に塗料の流下によるクマ
リの有無にりいて観察した結果であシ、「他」はこれら
以外についての観察結果である。“(Url 2) Painted surface: This is the result of visual observation of the condition of the formed painted surface. "Gloss" is the result of observation based on whether there is a difference in gloss between the electrodeposition coated part and the dip coated part. ,
"Tamari" is the result of observation based on the presence or absence of dark circles caused by falling paint at the bottom end of the object to be coated, and "Other" is the observation result for other than these. “

Claims (1)

【特許請求の範囲】[Claims] 水性塗料液内上部のみに電極を没入した浸漬塗装洛中に
、被塗物である長尺アルミニウム材を縦にして浸漬し、
該、電極と該被塗物との間に電流を通じながら浸漬塗装
したのち、該塗装浴から引き上げてＩＮＩＦを加熱硬化
させる長尺アルミニウム材の塗装方法において、該電極
を多孔質膜で隔離し、かつ該電極を塗料液面から、被塗
面との極間距離の１／２以内の深さまで没入し、しかも
、上記通電後、非通電下で０．５分以上塗料液中に浸漬
した後に引き上げ、次いで親木性有機溶剤蒸気濃度が１
００〜１５０００　ｐｐｍで、温度が２５〜４０℃であ
る雰囲気中で１分以上セツティングしてから、塗膜を加
熱硬化せしめることを特徴とする長尺アルミニウム材の
塗装方法。A long aluminum material to be coated is immersed vertically in a dip coating solution with electrodes immersed only in the upper part of the water-based paint solution.
In the method for coating a long aluminum material, the electrode and the object to be coated are coated by dipping while passing an electric current therebetween, and then pulled out of the coating bath and heated to harden the INIF, the electrode is isolated by a porous membrane, and after immersing the electrode from the paint liquid level to a depth within 1/2 of the distance between the electrodes and the surface to be coated, and after immersing the electrode in the paint liquid for 0.5 minutes or more without energizing after the above-mentioned energization. Then, the wood-loving organic solvent vapor concentration is 1
00 to 15,000 ppm in an atmosphere at a temperature of 25 to 40° C. for 1 minute or more, and then heating and curing the coating film.