JP2001050689A - Manufacture of precoat fin material for heat exchanger - Google Patents
Manufacture of precoat fin material for heat exchangerInfo
- Publication number
- JP2001050689A JP2001050689A JP22479099A JP22479099A JP2001050689A JP 2001050689 A JP2001050689 A JP 2001050689A JP 22479099 A JP22479099 A JP 22479099A JP 22479099 A JP22479099 A JP 22479099A JP 2001050689 A JP2001050689 A JP 2001050689A
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- JP
- Japan
- Prior art keywords
- coating
- organic
- baking
- inorganic composite
- temperature
- 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.)
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- Chemical Treatment Of Metals (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明はルームエアコン等
の熱交換器に使用されるアルミニウム合金製プレコート
フィン材の製造方法に関し、特に基材であるアルミニウ
ム合金薄板の表面に塗布型クロメート皮膜を形成し、さ
らにその皮膜上に有機無機複合塗料からなる親水性塗膜
を形成することによりプレコートフィン材を製造する方
法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an aluminum alloy precoated fin material used for a heat exchanger of a room air conditioner or the like, and more particularly to a method of forming a coating type chromate film on a surface of an aluminum alloy thin plate as a base material. And a method for producing a precoated fin material by forming a hydrophilic coating film composed of an organic-inorganic composite coating on the coating.
【０００２】[0002]
【従来の技術】一般にルームエアコンやカーエアコン等
に使用される熱交換器には、軽量でかつ加工性、熱伝導
性に優れたアルミニウム合金製フィン材が従来から広く
使用されている。一方近年、ルームエアコンやカーエア
コン等については、そのコンパクト化、省エネルギ化が
強く望まれるようになり、それに伴なって熱交換効率を
より一層向上させることが強く望まれている。そしてこ
のような要請に応えるための熱交換器の構造的な方策と
して、ルーバーを立ち起こしたり、フィンとフィンとの
間隔、すなわち熱媒体物質としての空気が流通する部分
の間隔を狭くすることが従来から行なわれている。とこ
ろがこのようにフィン間隔を狭くした場合、フィン表面
の親水性を高めることが必要となる。すなわち、フィン
表面の親水性が不充分であれば、冷房運転時に空気中の
水分の結露により生じたフィン表面の水滴がフィン間に
ブリッジを形成して、フィン間を通過する空気に対する
通風抵抗が増大し、そのため逆に熱交換効率を低下させ
てしまい、また水が通風とともに外部へ飛び出してしま
う不都合も生じ、さらにはフィン表面の水が長期間滞留
してフィン材の腐食が進行してしまう問題もある。一方
フィン表面の親水性が良好であれば、フィン表面に結露
により生じた水滴のフィン表面に対する接触角が小さく
なる結果、水滴はフィン間でブリッジを形成することな
く、フィン表面で拡がって水膜となり、速やかに流下す
るため、通風抵抗も大きくならず、また通風によって水
滴が外部へ飛び出してしまうことも少なく、さらにはフ
ィン表面での水の滞留時間も短くなるため腐食の進行も
回避して結果的に耐食性を向上させることができる。2. Description of the Related Art Aluminum alloy fins, which are lightweight and have excellent workability and heat conductivity, have been widely used for heat exchangers generally used in room air conditioners and car air conditioners. On the other hand, in recent years, for room air conditioners, car air conditioners, and the like, there has been a strong demand for compactness and energy saving, and accordingly, it has been strongly desired to further improve the heat exchange efficiency. As a structural measure of the heat exchanger to respond to such a demand, it is necessary to raise a louver or to reduce a distance between fins, that is, a distance between portions through which air as a heat medium substance flows. This has been done conventionally. However, when the fin interval is reduced as described above, it is necessary to increase the hydrophilicity of the fin surface. That is, if the hydrophilicity of the fin surface is insufficient, water droplets on the fin surface generated by dew condensation of moisture in the air during the cooling operation form a bridge between the fins, and the ventilation resistance against air passing between the fins is reduced. This increases the heat exchange efficiency, and conversely lowers the heat exchange efficiency. In addition, there is a disadvantage that water jumps out with the ventilation, and the water on the fin surface stays for a long time, and the corrosion of the fin material proceeds. There are also problems. On the other hand, if the hydrophilicity of the fin surface is good, the contact angle of water droplets generated by condensation on the fin surface with respect to the fin surface is reduced, so that the water droplets spread on the fin surface without forming a bridge between the fins and form a water film. Because it flows down quickly, the ventilation resistance does not increase, the water droplets rarely jump out to the outside due to the ventilation, and the residence time of water on the fin surface is also shortened, so that the progress of corrosion is avoided. As a result, the corrosion resistance can be improved.
【０００３】そこで従来からフィン表面の親水性を向上
させるため、フィン材表面に種々の親水性処理を施すこ
とが行なわれている。そしてこの場合、フィン材の基材
であるアルミニウム合金薄板の表面に、下地処理として
クロメート処理やベイマイト処理などを行なって耐食性
皮膜（下地皮膜）を形成した後、その耐食性皮膜上に親
水性処理として水ガラスやコロイダルシリカなどの無機
系塗料あるいは各種の有機系塗料、さらには有機無機複
合塗料などを塗布して焼付け乾燥し、親水性塗膜を形成
することが広く行なわれている。[0003] Therefore, in order to improve the hydrophilicity of the fin surface, various hydrophilic treatments have been conventionally performed on the fin material surface. In this case, the surface of the aluminum alloy sheet, which is the base material of the fin material, is subjected to a chromate treatment or a bayite treatment as a base treatment to form a corrosion-resistant film (base film), and then a hydrophilic treatment is performed on the corrosion-resistant film. It is widely practiced to apply an inorganic paint such as water glass or colloidal silica or various organic paints, and further apply an organic-inorganic composite paint and bake and dry to form a hydrophilic coating film.
【０００４】ところでアルミニウム合金製フィン材を用
いてルームエアコン等の熱交換器を組立てるにあたって
は、従来はフィン用アルミニウム合金薄板をフィン形状
に成形して組立て、その後に下地耐食性皮膜の形成や親
水性塗膜形成を行なう方式、すなわちポストコート方式
が一般的であったが、最近では主として生産性向上の観
点から、成形加工前のフィン用アルミニウム合金薄板の
表面に予め下地耐食性皮膜の形成や親水性塗膜の形成を
行なっておき、その後にフィン形状に成形して組立てる
方式、すなわちプレコート方式を適用することが多くな
っている。そして後者のプレコート方式の場合、フィン
材（すなわちプレコートフィン材）には、下地耐食性皮
膜や親水性塗膜が形成された状態での成形性が良好であ
ることが要求される。By the way, when assembling a heat exchanger such as a room air conditioner using an aluminum alloy fin material, conventionally, a thin aluminum alloy sheet for fin is formed into a fin shape and then assembled, and then formation of a base corrosion-resistant film and hydrophilicity are improved. A method of forming a coating film, that is, a post-coating method, was generally used, but recently, from the viewpoint of improving productivity, the formation of a base corrosion-resistant film and a hydrophilic property on the surface of an aluminum alloy sheet for fins before forming are mainly performed. In many cases, a method in which a coating film is formed and then formed into a fin shape and assembled, that is, a precoat method, is applied. In the case of the latter pre-coat method, the fin material (that is, the pre-coated fin material) is required to have good moldability in a state where a base corrosion-resistant film or a hydrophilic film is formed.
【０００５】一方最近では、生産性向上や環境保護等の
観点から、フィン材の成形加工時に低粘度で揮発性の高
いプレス油を用い、プレス成形後は従来の如きトリクロ
ロエチレンやアルカリ性脱脂剤による脱脂工程を省い
て、加熱乾燥のみを行なうことが多くなっている。On the other hand, recently, from the viewpoint of improving productivity and protecting the environment, a press oil having a low viscosity and a high volatility is used at the time of forming the fin material, and after press forming, degreasing with conventional trichloroethylene or an alkaline degreasing agent is performed. In many cases, only the heating and drying is performed without the step.
【０００６】[0006]
【発明が解決しようとする課題】前述のようにアルミニ
ウム合金薄板に予め下地耐食性皮膜および親水性塗膜を
形成したプレコートフィン材を成形するにあたっては、
成形性が良好であることが望まれるが、特に低粘度の揮
発性プレス油を用いて成形する場合は、より一層成形性
が優れていることが望まれる。しかしながら、従来一般
のプレコートフィン材では、低粘度の揮発性プレス油を
用いて成形した場合、成形時にカラー部での座屈や割
れ、飛び等の成形欠陥が発生することが多く、その意味
で成形性が良好とは言えなかったのが実情である。As described above, in forming a pre-coated fin material in which a base corrosion-resistant film and a hydrophilic film are formed in advance on an aluminum alloy sheet,
Although good moldability is desired, it is desired that the moldability be further excellent, particularly when molding is performed using a low-viscosity volatile press oil. However, in the case of a conventional general precoated fin material, when molding is performed using a low-viscosity volatile press oil, molding defects such as buckling, cracking, and jumping at the collar portion often occur during molding. The fact is that the moldability was not good.
【０００７】従来プレコートフィン材の成形性を向上さ
せるための方法としては、例えば特開平４−１９８２８
７号、特開平５−３１１１２３号、特公平１−２１７８
５号あるいは特公平２−２５６９２号に示されるよう
に、親水性塗膜の表面の潤滑性を良好にする方向で検討
がなされていた。しかしながら低粘度の揮発性プレス油
を用いて従来のプレコートフィン材を成形した場合、塗
膜表面の動摩擦係数が低くて潤滑性が良好である場合で
も、成形時に前述のような成形欠陥が発生することが判
明している。この点について本発明者等が種々検討を重
ねた結果、成形性には塗膜表面の潤滑性だけではなく、
塗膜と下地との密着性が大きな影響を与えていることが
判明した。すなわち、低粘度の揮発性プレス油を用いて
成形する場合、たとえ塗膜表面の動摩擦係数が低くて
も、塗膜と下地との密着性が悪ければ、成形中に塗膜が
下地から剥離し、潤滑性に劣る下地（耐食性皮膜もしく
はアルミニウム合金薄板表面）と成形用金型とが直接接
触して、凝着（いわゆる焼き付き）が生じ、そのため前
述のような座屈や割れ、飛び等の不具合が生じやすくな
ることが判明した。Conventional methods for improving the formability of precoated fin materials include, for example, JP-A-4-19828.
7, JP-A-5-31123, JP-B 1-2178
As described in JP-A No. 5 or JP-B-2-25692, studies have been made in the direction of improving the lubricity of the surface of the hydrophilic coating film. However, when a conventional pre-coated fin material is molded using a low-viscosity volatile press oil, the above-described molding defects occur during molding, even when the kinetic friction coefficient of the coating film surface is low and lubricity is good. It turns out that. As a result of various studies by the present inventors on this point, not only the lubricity of the coating film surface in the formability,
It was found that the adhesion between the coating film and the substrate had a great effect. That is, when molding using a low-viscosity volatile press oil, even if the dynamic friction coefficient of the coating film surface is low, if the adhesion between the coating film and the substrate is poor, the coating film peels from the substrate during molding. In addition, the base having poor lubricity (corrosion-resistant film or aluminum alloy thin plate surface) comes into direct contact with the molding die, and adhesion (so-called seizure) occurs. Was found to be more likely to occur.
【０００８】したがってプレコートフィン材の成形性を
改善して、低粘度揮発性プレス油を用いた成形加工にお
いても座屈や割れ、飛びなどの成形欠陥の発生を確実に
防止するためには、プレコートフィン材における親水性
塗膜と下地との密着性を向上させる必要がある。また下
地に対する親水性塗膜の密着性を向上させれば、塗膜の
耐水性も向上し、結果的に耐食性の向上に寄与する。Therefore, in order to improve the moldability of the precoated fin material and to reliably prevent the occurrence of molding defects such as buckling, cracking, and jumping even in molding using a low-viscosity volatile press oil, it is necessary to use a pre-coated fin material. It is necessary to improve the adhesion between the hydrophilic coating film and the base in the fin material. Further, if the adhesion of the hydrophilic coating film to the base is improved, the water resistance of the coating film is also improved, and as a result, it contributes to the improvement of corrosion resistance.
【０００９】ところで下地耐食性皮膜上に塗布される親
水性塗膜としては、前述のように無機系塗料、有機系塗
料、有機無機複合塗料があるが、最近ではこれらのうち
でも特にケイ酸もしくはケイ酸塩と有機樹脂とを含む有
機無機複合塗料を用いることが多くなっている。そして
このような有機無機複合塗料としては、ケイ酸もしくは
ケイ酸塩と有機樹脂のほか、さらに水溶性潤滑樹脂、界
面活性剤、および架橋剤を添加混合したものを用いるの
が一般的である。As the hydrophilic coating film applied on the base corrosion-resistant coating film, there are inorganic coatings, organic coatings, and organic-inorganic composite coatings as described above. Organic-inorganic composite coatings containing acid salts and organic resins are increasingly used. As such an organic-inorganic composite paint, it is common to use a mixture obtained by adding and mixing a water-soluble lubricating resin, a surfactant, and a crosslinking agent in addition to silicic acid or a silicate and an organic resin.
【００１０】上述のような有機無機複合塗料を用いて下
地耐食性皮膜上に親水性塗膜を形成するにあたっては、
先ず水に前述のような各成分を添加し、撹拌・混合して
塗料浴を形成し（すなわちいわゆる“建浴”を行な
い）、その後下地耐食性皮膜上に塗布し、さらに焼付け
を行なう必要があるが、従来は建浴方法やその後の塗
布、焼付けのプロセスについては、必ずしも充分な検討
がなされていたとは言えなかったのが実情である。In forming a hydrophilic coating film on a base corrosion-resistant coating film using the above-mentioned organic-inorganic composite coating material,
First, it is necessary to add each of the above-mentioned components to water, stir and mix to form a paint bath (that is, perform a so-called "building bath"), and then apply the coating on the base corrosion-resistant film and further bake. However, the fact is that it has not always been possible to say that the building bath method and the subsequent coating and baking processes have always been sufficiently studied.
【００１１】すなわち従来は、建浴に関しては混合時の
温度やその後の保持温度については若干の検討がなさ
れ、また焼付け温度についても検討がなされているが、
建浴時における各成分の混合順序（添加順序）や、それ
ぞれの成分添加後の撹拌時間、液温の上限、建浴から塗
装終了までの時間、さらには詳細な焼付けヒートパター
ン等については充分な検討がなされていなかった。しか
るに本発明者等がこれらの条件について詳細な実験・検
討を繰返した結果、建浴時の各成分の添加順序、撹拌時
間、液温、建浴から塗装終了までの時間、詳細な焼付け
ヒートパターン等も塗膜の性能や品質に重大な影響を与
えることを見出したのである。[0011] That is, in the past, some studies have been made on the temperature at the time of mixing and the subsequent holding temperature of the building bath, and also on the baking temperature.
The mixing order (addition order) of each component at the time of building bath, the stirring time after addition of each component, the upper limit of liquid temperature, the time from building bath to the end of coating, and further detailed baking heat pattern are sufficient. No consideration was given. However, as a result of repeating detailed experiments and studies on these conditions by the present inventors, the order of addition of each component at the time of building bath, stirring time, liquid temperature, time from building bath to completion of coating, detailed baking heat pattern And the like have also found that they have a significant effect on the performance and quality of the coating film.
【００１２】すなわち、上述のような建浴時の各成分添
加順序等の条件が不適切であれば、塗装時における塗料
の成分が不均一となったり、ケイ酸もしくはケイ酸塩の
塗料浴中での析出や、塗料の固化に伴なう塗装欠陥発生
等の不都合を招くことが判明した。そしてその結果、ム
ラや塗布抜けなどの塗装外観不良、あるいは凝集したケ
イ酸もしくはケイ酸塩の塗膜表面からの脱離によるセメ
ント臭などの臭気発生、また凝集したケイ酸もしくはケ
イ酸塩による金型摩耗、成形傷の発生、潤滑成分の不均
一による潤滑不良などの成形不良、さらには塗料成分の
不均一による局部的な水濡れ性不良などの親水性不良な
どの不都合が発生していたのである。That is, if the conditions such as the order of addition of each component at the time of building bath are inappropriate, the components of the coating at the time of painting become uneven or the silicic acid or silicate coating bath It has been found that this causes inconveniences such as precipitation at the surface and coating defects caused by solidification of the paint. As a result, poor coating appearance such as unevenness or coating omission, generation of odor such as cement odor due to detachment of agglomerated silicic acid or silicate from the surface of the coating film, and gold due to agglomerated silicic acid or silicate Inconveniences such as mold abrasion, molding defects, poor molding such as poor lubrication due to uneven lubricating components, and poor hydrophilic properties such as localized poor wetting due to uneven coating components occurred. is there.
【００１３】この発明は以上の事情を背景としてなされ
たもので、下地耐食性皮膜として予め塗布型クロメート
皮膜を形成し、その後塗布型クロメート皮膜表面に、親
水性塗料として、ケイ酸もしくはケイ酸塩と有機樹脂と
を含む有機無機複合塗料を塗布して焼付け、これによっ
て親水性塗膜を形成するにあたり、前述の諸問題を解決
し、親水性塗膜の密着性を確実かつ安定して向上させて
低粘度の揮発性プレス油を用いた場合でも成形性、潤滑
性を安定して向上させ、かつ親水性、親水持続性が良好
であり、さらに塗膜外観も良好でまた臭気発生も少ない
親水性塗膜を形成し得ることを見出し、この発明をなす
に至ったのである。The present invention has been made in view of the above circumstances. A coating-type chromate film is formed in advance as a base corrosion-resistant film, and then a silicic acid or silicate is coated on the surface of the coating-type chromate film as a hydrophilic paint. Applying and baking an organic-inorganic composite coating containing an organic resin and baking it, thereby forming the hydrophilic coating, solving the above-mentioned problems, and reliably and stably improving the adhesion of the hydrophilic coating. Even when a low-viscosity volatile press oil is used, the moldability and lubricity are stably improved, and the hydrophilicity and hydrophilic persistence are good, and the coating film appearance is good and the odor generation is low. They have found that a coating film can be formed, and have accomplished the present invention.
【００１４】[0014]
【課題を解決するための手段】本発明者等は、塗布型ク
ロメート皮膜上に親水性塗料としてケイ酸もしくはケイ
酸塩と有機樹脂とを含む有機無機複合塗料を塗布して焼
付けるにあたって、有機無機複合塗料の建浴条件、特に
有機無機複合塗料を構成する各成分の添加順序や撹拌時
間、液温、および建浴から塗装終了までの時間、さらに
は焼付けのための詳細なパターン条件等を厳密に規定す
ることによって、前述の諸問題を解決し得ることを見出
し、この発明をなすに至った。SUMMARY OF THE INVENTION The present inventors have applied an organic-inorganic composite paint containing a silicic acid or silicate and an organic resin as a hydrophilic paint on a coating type chromate film, and baked it. Building bath conditions of the inorganic composite paint, especially the order of addition of each component constituting the organic-inorganic composite paint, stirring time, liquid temperature, time from building bath to the end of painting, and detailed pattern conditions for baking etc. It has been found that the above-mentioned problems can be solved by strictly defining, and the present invention has been accomplished.
【００１５】具体的には、請求項１の発明は、予めアル
ミニウム合金基材表面に塗布型クロメート皮膜を形成し
ておき、その塗布型クロメート皮膜表面にケイ酸もしく
はケイ酸塩と有機樹脂とを含有する有機無機複合塗料を
塗布して焼付けることにより、塗布型クロメート皮膜上
に親水性を有する有機無機複合皮膜を形成する熱交換器
用プレコートフィン材の製造方法において、有機無機複
合塗料を建浴するにあたり、有機無機複合塗料を構成す
べき各成分をそれぞれ２０〜２５℃の範囲内の温度で保
持しながら、先ず水に水溶性潤滑樹脂を添加し、次いで
界面活性剤を添加した後、有機樹脂を添加し、その後架
橋剤を添加してからケイ酸もしくはケイ酸塩を添加し、
かつこれらの各成分を添加する毎にそれぞれ５〜１０分
間撹拌することによって、有機無機複合塗料を建浴し、
その後も有機無機複合塗料の温度を２０〜２５℃の範囲
内に保持しながら、全成分の添加混合の終了から１０時
間以内に塗布型クロメート皮膜上に塗布・焼付けを行な
い、しかもその塗布・焼付けにあたって、塗布直前のア
ルミニウム合金基材の温度を１５〜２５℃の範囲内に保
持するとともに、塗布後焼付け開始までの時間を１〜６
０秒の範囲内とし、さらに焼付け開始からアルミニウム
合金基材の温度が１００℃になるまでの時間を３〜７秒
の範囲内となるようにして塗布・焼付けを行なうことを
特徴とするものである。Specifically, the invention of claim 1 is to form a coating type chromate film on the surface of an aluminum alloy base material in advance, and to apply a silicic acid or a silicate and an organic resin on the surface of the coating type chromate film. In a method for producing a precoated fin material for a heat exchanger, which forms an organic-inorganic composite coating having hydrophilicity on a coating type chromate coating by applying and baking an organic-inorganic composite coating containing the organic-inorganic composite coating, In doing so, while maintaining each component constituting the organic-inorganic composite coating at a temperature in the range of 20 to 25 ° C., first, a water-soluble lubricating resin is added to water, and then a surfactant is added. Add the resin, then add the crosslinking agent, then add the silicic acid or silicate,
Each time these components are added, the mixture is stirred for 5 to 10 minutes to form an organic-inorganic composite paint,
Thereafter, while maintaining the temperature of the organic-inorganic composite coating within the range of 20 to 25 ° C., the coating and baking is performed on the coating type chromate film within 10 hours after the completion of the addition and mixing of all the components, and the coating and baking is performed. In doing so, while keeping the temperature of the aluminum alloy base material immediately before coating within the range of 15 to 25 ° C., the time until the start of baking after coating is 1 to 6
The coating and baking are performed within a range of 0 seconds, and a time period from the start of baking until the temperature of the aluminum alloy base material reaches 100 ° C. is within a range of 3 to 7 seconds. is there.
【００１６】また請求項２の発明は、予めアルミニウム
合金基材表面に塗布型クロメート皮膜を形成しておき、
その塗布型クロメート皮膜表面にケイ酸もしくはケイ酸
塩と有機樹脂とを含有する有機無機複合塗料を塗布して
焼付けることにより、塗布型クロメート皮膜上に親水性
を有する有機無機複合皮膜を形成する熱交換器用プレコ
ートフィン材の製造方法において、有機無機複合塗料を
建浴するにあたり、有機無機複合塗料を構成すべき各成
分をそれぞれ２０〜２５℃の範囲内の温度で保持しなが
ら、先ず水に水溶性潤滑樹脂を添加し、次いで有機樹脂
を添加した後、界面活性剤を添加し、その後架橋剤を添
加してからケイ酸もしくはケイ酸塩を添加し、かつこれ
らの各成分を添加する毎にそれぞれ５〜１０分間撹拌す
ることによって、有機無機複合塗料を建浴し、その後も
有機無機複合塗料の温度を２０〜２５℃の範囲内に保持
しながら、全成分の添加混合の終了から１０時間以内に
塗布型クロメート皮膜上に塗布・焼付けを行ない、しか
もその塗布・焼付けにあたって、塗布直前のアルミニウ
ム合金基材の温度を１５〜２５℃の範囲内に保持すると
ともに、塗布後焼付け開始までの時間を１〜６０秒の範
囲内とし、さらに焼付け開始からアルミニウム合金基材
の温度が１００℃になるまでの時間を３〜７秒の範囲内
となるようにして塗布・焼付けを行なうことを特徴とす
るものである。According to a second aspect of the present invention, a coating type chromate film is formed on the surface of the aluminum alloy base material in advance.
An organic-inorganic composite coating containing silicic acid or silicate and an organic resin is applied to the surface of the coating-type chromate film and baked to form a hydrophilic organic-inorganic composite film on the coating-type chromate film. In the method for producing a precoated fin material for a heat exchanger, when building the organic-inorganic composite coating, firstly, while maintaining each component constituting the organic-inorganic composite coating at a temperature within the range of 20 to 25 ° C., A water-soluble lubricating resin is added, then an organic resin is added, a surfactant is added, a crosslinking agent is added, silicic acid or silicate is added, and each time these components are added. The organic-inorganic composite paint is built up by stirring each for 5 to 10 minutes, and thereafter, while keeping the temperature of the organic-inorganic composite paint within the range of 20 to 25 ° C., The coating and baking is performed on the coating type chromate film within 10 hours after the completion of the addition and mixing, and at the time of the coating and baking, the temperature of the aluminum alloy base material immediately before the coating is kept within a range of 15 to 25 ° C. The time from the start of baking to the start of baking is set within a range of 1 to 60 seconds, and the time from the start of baking until the temperature of the aluminum alloy base material reaches 100 ° C. is within a range of 3 to 7 seconds. It is characterized by baking.
【００１７】このように請求項１、請求項２の発明の熱
交換器用プレコートフィン材の製造方法では、予めアル
ミニウム合金基材表面に塗布型クロメート皮膜を形成し
ておき、その後にケイ酸もしくはケイ酸塩と有機樹脂と
を含有する有機無機複合塗料を塗布して焼付け、塗布型
クロメート皮膜上に親水性塗膜としての有機無機複合皮
膜を形成することを前提としている。そして有機無機複
合塗料の建浴条件（Ａ）として、建浴時における各成分
の保持温度（Ａ−１）、各成分の添加順序（Ａ−２）、
各成分添加ごとの撹拌時間（Ａ−３）、建浴から塗布ま
での浴の保持温度（Ａ−４）、建浴終了から塗布・焼付
け終了までの時間（Ａ−５）の各条件を次のように規定
し、さらに有機無機複合塗料の塗布・焼付け条件（Ｂ）
として、塗布直前におけるアルミニウム合金基材温度
（Ｂ−１）、塗布後焼付け開始までの時間（Ｂ−２）、
焼付け開始からアルミニウム合金基材温度が１００℃に
達するまでの時間（Ｂ−３）の各条件を規定している。 Ａ：建浴条件 Ａ−１；各成分の保持温度２０〜２５℃ Ａ−２；各成分の添加順序 ［請求項１］ 水→水溶性潤滑樹脂→有機樹脂→界面活
性剤→架橋剤→ケイ酸もしくはケイ酸塩 ［請求項２］ 水→水溶性潤滑樹脂→界面活性剤→有機
樹脂→架橋剤→ケイ酸もしくはケイ酸塩 Ａ−３；各成分添加時の撹拌時間 ５〜１０分 Ａ−４；建浴から塗布までの浴の保持温度 ２０〜２５
℃ Ａ−５；建浴終了から塗布・焼付け終了までの時間 １
０時間以内 Ｂ：塗布・焼付け条件 Ｂ−１；塗布時の基材温度 １５〜２５℃ Ｂ−２；塗布後焼付け開始までの時間 １〜６０秒 Ｂ−３；焼付け開始から基材温度が１００℃に達するま
での時間 ３〜７秒As described above, in the method for producing a precoated fin material for a heat exchanger according to the first and second aspects of the present invention, a coating type chromate film is formed on the surface of an aluminum alloy base material in advance, and then silicic acid or silica is formed. It is assumed that an organic-inorganic composite coating containing an acid salt and an organic resin is applied and baked to form an organic-inorganic composite coating as a hydrophilic coating on the coating type chromate coating. And as the bathing conditions (A) of the organic-inorganic composite paint, the holding temperature of each component at the time of bathing (A-1), the addition order of each component (A-2),
The conditions of stirring time (A-3) for each component addition, bath holding temperature from building bath to coating (A-4), and time from completion of building bath to completion of coating and baking (A-5) are as follows. And the application and baking conditions of the organic-inorganic composite paint (B)
The temperature of the aluminum alloy base material immediately before coating (B-1), the time until the start of baking after coating (B-2),
Each condition of the time (B-3) from the start of baking until the temperature of the aluminum alloy base material reaches 100 ° C. is defined. A: Building bath conditions A-1; Retention temperature of each component 20 to 25 ° C A-2; Addition order of each component [Claim 1] Water → water-soluble lubricating resin → organic resin → surfactant → crosslinking agent → silica Acid or silicate [Claim 2] Water → water-soluble lubricating resin → surfactant → organic resin → crosslinking agent → silicic acid or silicate A-3; stirring time at the time of adding each component 5-10 minutes A- 4: Holding temperature of bath from building bath to coating 20-25
℃ A-5; Time from the end of bathing to the end of coating and baking 1
0 hours or less B: Coating and baking conditions B-1; Base material temperature at the time of coating 15 to 25 ° C. B-2; Time from coating to start of baking 1 to 60 seconds B-3; Time to reach ℃ 3-7 seconds
【００１８】[0018]
【発明の実施の形態】この発明の方法を実施するにあた
っては、予めアルミニウム合金基材の薄板に塗布型クロ
メート皮膜を形成しておく。ここで、基材となるアルミ
ニウム合金薄板は、要は従来から熱交換器用フィン材と
して使用されているものであれば良く、特に限定される
ものではない。すなわち、ＪＩＳ規格の１１００合金、
１０５０合金、１Ｎ３０合金等の純アルミニウム系合
金、あるいは２０１７合金、２０２４合金等のＡｌ−Ｃ
ｕ系合金、また３００３合金、３００４合金等のＡｌ−
Ｍｎ系合金、５０５２合金、５０８３合金等のＡｌ−Ｍ
ｇ系合金、さらには６０６１合金等のＡｌ−Ｍｇ−Ｓｉ
系合金などを用いることができる。またアルミニウム合
金基材の形状は、要は薄板であれば良く、シートあるい
はコイルのいずれでも良い。DESCRIPTION OF THE PREFERRED EMBODIMENTS In carrying out the method of the present invention, a coating type chromate film is formed on a thin plate of an aluminum alloy substrate in advance. Here, the aluminum alloy thin plate serving as the base material is not particularly limited as long as it has been conventionally used as a fin material for a heat exchanger. That is, JIS standard 1100 alloy,
Pure aluminum alloys such as 1050 alloy and 1N30 alloy, or Al-C such as 2017 alloy and 2024 alloy
Al-based alloys such as u-based alloys, 3003 alloys and 3004 alloys
Al-M such as Mn-based alloy, 5052 alloy, 5083 alloy
Al-Mg-Si such as g-based alloy, and 6061 alloy
A system alloy or the like can be used. The shape of the aluminum alloy substrate may be a thin plate, and may be a sheet or a coil.
【００１９】このようなアルミニウム合金基材（薄板）
に対しては、脱脂、水洗、乾燥を行なった後、塗布型ク
ロメート液を塗布し、その後焼付けのための加熱を行な
って基材上で皮膜として固化させる。Such an aluminum alloy substrate (thin plate)
, After applying degreasing, washing and drying, a coating type chromate solution is applied, followed by heating for baking to solidify as a film on the substrate.
【００２０】ここで、塗布型クロメート液の種類、組成
は特に限定されるものではなく、要は少なくともＣｒ6+
イオンと、固化のための樹脂を含有していれば良く、一
般に市販されているものを適宜使用することができる。
また塗布方法としても従来と同様にロールコーターなど
によって塗布すれば良い。さらに、塗布型クロメート液
の塗布量も特に限定されるものではないが、通常は金属
Ｃｒ量にして３〜１００ｍｇ／ｍ2 の範囲内とすること
が好ましい。[0020] Here, the type of coating type chromate bath, but the present invention is not particularly limited composition, short at least Cr 6+
What is necessary is just to contain the ion and the resin for solidification, and what is generally marketed can be used suitably.
In addition, the coating may be performed by a roll coater or the like as in the conventional method. Further, the amount of the coating type chromate solution to be applied is not particularly limited, but it is usually preferable to set the amount of metallic Cr in a range of 3 to 100 mg / m 2 .
【００２１】上述のようにして形成された塗布型クロメ
ート皮膜表面に有機無機複合塗料を塗布するにあたって
は、その塗布前に有機無機複合塗料の各成分を溶媒とし
ての水に順次添加して撹拌し、塗料浴を建浴する。ここ
で、有機無機複合塗料の成分としては、溶媒としての水
と、塗膜の主体となるべきケイ酸もしくはケイ酸塩およ
び有機樹脂のほか、水溶性潤滑樹脂、界面活性剤、およ
び架橋剤を添加するのが一般的である。In applying the organic-inorganic composite coating to the surface of the coating type chromate film formed as described above, each component of the organic-inorganic composite coating is sequentially added to water as a solvent and stirred before the application. Establish a paint bath. Here, as components of the organic-inorganic composite paint, water as a solvent, silicic acid or silicate to be the main component of the coating film and an organic resin, a water-soluble lubricating resin, a surfactant, and a crosslinking agent are used. It is common to add.
【００２２】そしてこれらの各成分を溶媒としての水に
添加混合して建浴するにあたって、各成分の温度を前述
のように２０〜２５℃に保持する必要があり、また建浴
後の塗料も２０〜２５℃の範囲内に保持する必要があ
る。このような各成分および塗料の保持温度の限定理由
は次の通りである。When these components are added to water as a solvent and mixed to form a bath, the temperature of each component must be maintained at 20 to 25 ° C. as described above. It must be kept within the range of ２５25 ° C. The reasons for limiting the holding temperature of each component and paint are as follows.
【００２３】すなわち２０℃未満の場合には、有機無機
複合塗料の成分である水溶性潤滑樹脂や有機樹脂等の粘
度が高くなるため、添加混合がやりにくくなり、各成分
の混合が不充分となって、塗膜の密着性が悪くなるおそ
れがあり、さらに建浴後の塗料の粘度も高くなるため、
塗装の際のローピングに伴なって塗装筋が発生するな
ど、塗装が難しくなり、また塗装焼付け後の塗膜が白化
しやすいといった不都合が発生する。なお塗膜の白化
は、塗装焼付け後に水溶性潤滑樹脂が塗膜最表面に充分
に浮き出なくなるために発生する。That is, when the temperature is lower than 20 ° C., the viscosity of the water-soluble lubricating resin or the organic resin, which is a component of the organic-inorganic composite coating material, becomes high. It is possible that the adhesion of the coating film may be deteriorated, and the viscosity of the paint after building bath also increases,
The coating becomes difficult, for example, a coating streak occurs along with the roping at the time of coating, and the coating film after baking is easily whitened. The whitening of the coating film occurs because the water-soluble lubricating resin does not sufficiently float on the outermost surface of the coating film after baking.
【００２４】一方２５℃を越える場合には、有機無機複
合塗料の建浴中および建浴後にコーターパン等からの水
分蒸発による成分濃縮が激しくなって成分濃度が増加し
てしまうおそれがあり、また塗料液中の樹脂と架橋剤の
架橋反応が進みやすくなり、これらの理由によって塗料
粘度の経時変化が激しくなり、短時間のうちに粘度が急
激に増加してしまって、塗料の寿命が極端に短くなる。
またその結果、塗料の建浴頻度を多くせざるを得ず、生
産性が低下する。また上述のように塗料粘度の変化が大
きいため、均一な厚みで塗装するためには塗装条件を連
続的に変化させなければならず、例えばロールコーター
で塗装する場合にはギャップ調整を連続的に変化させな
ければならないなどの面倒が生じる。On the other hand, when the temperature exceeds 25 ° C., during and after the bathing of the organic-inorganic composite paint, the concentration of the components due to the evaporation of water from the coater pan or the like becomes intense, and the component concentration may increase. The cross-linking reaction between the resin and the cross-linking agent in the coating liquid tends to proceed, and for these reasons the viscosity of the coating changes over time, causing the viscosity to increase rapidly in a short time, resulting in an extremely long life of the coating. Be shorter.
As a result, the bathing frequency of the paint must be increased, and the productivity is reduced. In addition, since the change in paint viscosity is large as described above, the coating conditions must be continuously changed in order to apply a uniform thickness.For example, when coating with a roll coater, the gap adjustment must be performed continuously. It has to be changed.
【００２５】また、有機無機複合塗料を建浴するにあた
っての各成分の添加混合順序、すなわち建浴順序として
は、請求項１で規定するように、［水］→［水溶性潤滑
樹脂］→［有機樹脂］→［界面活性剤］→［架橋剤］→
［ケイ酸もしくはケイ酸塩］の順とするか、または請求
項２で規定するように、［水］→［水溶性潤滑樹脂］→
［界面活性剤］→［有機樹脂］→［架橋剤］→［ケイ酸
もしくはケイ酸塩］の順とする必要がある。このように
建浴順序を定めた理由は次の通りである。In addition, the order of addition and mixing of the components when the organic-inorganic composite paint is bathed, that is, the bathing order, is defined as follows: [water] → [water-soluble lubricating resin] → [ Organic resin] → [surfactant] → [crosslinking agent] →
[Silicic acid or silicate], or [water] → [water-soluble lubricating resin] →
The order must be [surfactant] → [organic resin] → [crosslinking agent] → [silicic acid or silicate]. The reason for setting the bathing order in this way is as follows.
【００２６】すなわち、ケイ酸もしくはケイ酸塩、界面
活性剤、水溶性潤滑樹脂、有機樹脂、架橋剤は溶媒であ
る水を含めて塗料液中で複雑な凝集物を形成する。この
凝集物は各成分を混合する順序を変えることにより、そ
の構造が大きく変化し、またその凝集物の構造変化によ
りその性質も変化を起こすと推測される。その結果混合
順序が不適切であれば、有機無機複合塗料の性状が変化
してしまって、塗装焼付け後の塗膜においてケイ酸もし
くはケイ酸塩の析出不足、潤滑成分の析出不足、塗膜白
化等の不都合が発生する。That is, silicic acid or a silicate, a surfactant, a water-soluble lubricating resin, an organic resin, and a cross-linking agent form complex aggregates in a coating liquid including water as a solvent. It is presumed that the structure of the aggregate changes greatly by changing the order in which the components are mixed, and that its properties also change due to the structural change of the aggregate. As a result, if the mixing order is inappropriate, the properties of the organic-inorganic composite coating will change, resulting in insufficient precipitation of silicic acid or silicate, insufficient precipitation of lubricating components, and whitening of the coating after baking. Inconveniences such as occur.
【００２７】水溶性潤滑樹脂については、最初に溶媒で
ある水に添加混合し、その後各成分の添加を行なうのが
適切である。これは、水および水溶性潤滑樹脂の粘度が
他の成分と比較して低いため、水溶性潤滑樹脂を水中に
均一に分散させることが容易であること、またこれらの
２成分を混合した液中へその他の各成分の添加を行なえ
ば、各成分添加時の粘度の増加を緩和することができる
から、各成分を均一に混合することが容易となるためで
ある。For the water-soluble lubricating resin, it is appropriate to first add and mix it with water as a solvent, and then add each component. This is because the viscosity of water and the water-soluble lubricating resin is lower than that of other components, so that it is easy to uniformly disperse the water-soluble lubricating resin in water. This is because, if the other components are added, the increase in viscosity at the time of addition of each component can be alleviated, so that each component can be easily mixed uniformly.
【００２８】界面活性剤と有機樹脂の添加順序は、いず
れが先でも構わない。一方架橋剤は界面活性剤の添加よ
りも後に添加することが適当である。これは、有機樹脂
に架橋剤を添加すれば、有機樹脂の架橋反応が生じて粘
度が急激に増加するから、架橋剤の添加後に界面活性剤
を添加した場合には、界面活性剤の分散が不充分となっ
てしまい、またそのため塗料液中で形成される凝集物の
構造が大きく変化してしまって、塗料の性状が異なった
ものとなってしまうからである。The order of adding the surfactant and the organic resin does not matter. On the other hand, it is appropriate to add the crosslinking agent after the addition of the surfactant. This is because if a cross-linking agent is added to an organic resin, a cross-linking reaction of the organic resin occurs and the viscosity increases sharply. This is because the structure becomes insufficient, and the structure of the aggregate formed in the coating liquid is greatly changed, resulting in different properties of the coating.
【００２９】また架橋剤と有機樹脂の添加順序について
も、架橋剤の添加は有機樹脂の添加よりも後に行なうこ
とが適当である。すなわち、架橋剤は有機樹脂の架橋反
応を行なうために添加するものであるが、既に述べたよ
うに有機樹脂の添加よりも前に水溶性潤滑樹脂が添加さ
れており、この状態で、仮に有機樹脂より前に架橋剤を
添加したとすれば、水溶性潤滑樹脂に架橋剤が配位して
しまうことがある。このような反応が生じた場合には、
塗料浴中での水溶性潤滑樹脂の分散が不充分となり、そ
の結果塗膜の潤滑性が悪くなって、フィンの成形不良な
どの不具合が生じてしまう。一方有機樹脂と水溶性潤滑
樹脂が混在している液中に金属架橋剤を添加した場合に
は、架橋剤は有機樹脂と優先的に配位するため、上述の
ような問題の発生を避けることができる。したがって架
橋剤は有機樹脂の後に添加することが適切である。Regarding the order of adding the crosslinking agent and the organic resin, it is appropriate that the addition of the crosslinking agent is performed after the addition of the organic resin. That is, the cross-linking agent is added to perform a cross-linking reaction of the organic resin, but as described above, the water-soluble lubricating resin is added prior to the addition of the organic resin, and in this state, the organic If the crosslinking agent is added before the resin, the crosslinking agent may coordinate with the water-soluble lubricating resin. When such a reaction occurs,
Dispersion of the water-soluble lubricating resin in the coating bath becomes insufficient, and as a result, the lubricating property of the coating film deteriorates, resulting in problems such as poor fin molding. On the other hand, when a metal cross-linking agent is added to a liquid in which an organic resin and a water-soluble lubricating resin are mixed, the cross-linking agent is preferentially coordinated with the organic resin. Can be. Therefore, it is appropriate to add the crosslinking agent after the organic resin.
【００３０】ケイ酸もしくはケイ酸塩は最後に添加する
ことが適当である。これは、水にケイ酸もしくはケイ酸
塩を添加した後に他の成分を添加すれば、混合途中の塗
料液中でケイ酸もしくはケイ酸塩の析出を生じやすく、
そのため焼付け後の塗膜上にケイ酸が凝集した白点が発
生する等の不都合を生じるからである。Suitably, the silicic acid or silicate is added last. This means that if other components are added after adding silicic acid or silicate to water, silicic acid or silicate is likely to precipitate in the coating liquid during mixing,
For this reason, inconveniences such as generation of white spots in which silicic acid aggregates on the coating film after baking occur.
【００３１】次に、建浴時においては、各成分を添加す
るごとに５〜１０分撹拌することが必要である。その理
由は次の通りである。Next, at the time of bathing, it is necessary to stir for 5 to 10 minutes each time each component is added. The reason is as follows.
【００３２】すなわち、撹拌時間が５分未満の場合に
は、撹拌が不充分となって、各成分が均一に混合されて
いない塗料となってしまい、そのため塗膜密着性不足、
塗膜白化等の不都合が発生する。一方撹拌時間が１０分
を越える場合には、撹拌の効果が飽和し、また塗料の建
浴時間が長くかかることになって、生産性が低下してし
まう。That is, when the stirring time is less than 5 minutes, the stirring becomes insufficient, resulting in a paint in which the respective components are not uniformly mixed.
Problems such as whitening of the coating film occur. On the other hand, when the stirring time exceeds 10 minutes, the effect of the stirring is saturated, and the bathing time of the paint takes a long time, and the productivity is reduced.
【００３３】以上のように各成分を添加混合して塗料浴
を建浴した後には、１０時間以内に塗装焼付けを完了す
ることが適当である。すなわち、建浴終了後も塗料粘度
は次第に増加するから、建浴終了後に長時間経過した塗
料を用いて塗装焼付けした場合には、塗料の粘度が高い
ために塗装の際のローピングに伴なって塗装筋が発生す
るなど、塗装性が悪化し、さらに粘度が増加すれば、遂
には塗料がゲル化してしまって、塗装不能となってしま
う。建浴後１０時間以内であれば、このような不都合を
招くおそれが少ない。After the components are added and mixed to form a paint bath as described above, it is appropriate to complete the baking within 10 hours. In other words, since the viscosity of the paint gradually increases even after the end of the bath, when the paint is baked using the paint that has been passed for a long time after the end of the bath, the viscosity of the paint is high, so the roping at the time of painting is accompanied. If the paintability deteriorates due to the formation of paint streaks and the viscosity further increases, the paint will eventually gel and become unpaintable. If it is within 10 hours after the bathing, there is little possibility of causing such inconvenience.
【００３４】さらに塗布直前におけるアルミニウム合金
基材の温度は、１５〜２５℃の範囲内とする必要があ
る。その理由は次の通りである。Further, the temperature of the aluminum alloy substrate immediately before the application must be in the range of 15 to 25 ° C. The reason is as follows.
【００３５】すなわち、塗布直前の基材温度が１５℃未
満の場合には、基材上に塗布された塗料が冷却されてし
まい、そのため塗料成分が不均一化し、その結果塗布面
にムラが生じたり、塗膜焼付け後に潤滑成分が充分に分
離せずに塗膜が白化したりするおそれがある。一方塗布
時の基材温度が２５℃を越える場合には、基材上に塗布
された塗料が加温されてしまい、そのため塗料中の溶媒
である水分の蒸発が速くなって、塗料粘度が急速に増加
し、その結果塗料液が平坦になる前に固化が始まってし
まい、焼付け後の塗膜面に畳目状の凹凸を生じたり、塗
膜厚が不均一になったりするおそれがある。That is, if the temperature of the base material immediately before the application is lower than 15 ° C., the coating material applied on the base material is cooled, so that the components of the coating material become non-uniform, and as a result, the coating surface becomes uneven. Also, the lubricating components may not be sufficiently separated after the coating is baked, resulting in whitening of the coating. On the other hand, if the temperature of the base material at the time of application exceeds 25 ° C., the paint applied on the base material is heated, so that the evaporation of water as a solvent in the paint is accelerated, and the viscosity of the paint is rapidly increased. As a result, the solidification starts before the coating liquid becomes flat, and there is a possibility that the coating film surface after baking may have creasing unevenness or the coating film thickness may be non-uniform.
【００３６】さらに塗料を塗布した後、焼付け開始まで
の時間（タクトタイム）は１〜６０秒、好ましくは２〜
１５秒とすることが適当である。その理由は次の通りで
ある。The time (tact time) from the application of the paint to the start of baking is 1 to 60 seconds, preferably 2 to 60 seconds.
15 seconds is appropriate. The reason is as follows.
【００３７】タクトタイムが１秒未満の場合には、基材
上に塗布された塗料が流れて平滑化するための時間が足
りず、平滑となる前に固化が始まってしまい、その結果
焼付け後の塗膜面に畳目状の凹凸を生じたり、塗膜厚が
不均一になったりするおそれがある。一方タクトタイム
を６０秒を越えて長くしても効果は変わらず、ライン長
を伸ばすだけになってしまい、コスト高となってしま
う。したがってタクトタイムは１〜６０秒の範囲内、好
ましくは２〜１５秒とする。If the tact time is less than 1 second, the time required for the coating applied on the base material to flow and smooth is not enough, and solidification starts before smoothing, and as a result, There is a possibility that the surface of the coating film may have fold-like irregularities or the thickness of the coating film may be non-uniform. On the other hand, if the tact time is increased beyond 60 seconds, the effect does not change, but only the line length is increased, and the cost is increased. Therefore, the tact time is in the range of 1 to 60 seconds, preferably 2 to 15 seconds.
【００３８】さらに塗料塗布後の焼付け時の昇温につい
ては、焼付け開始時すなわち材料を焼付け炉に入れた時
点から基材温度が１００℃に達するまでの時間が３〜７
秒の間となるように制御する必要がある。すなわち、焼
付けのための昇温の間、塗料は液体の状態を保ちながら
も沸点近くまで加熱されるが、この間に塗料は塗布型ク
ロメート皮膜表面と反応し、この反応によって有機無機
複合皮膜と塗布型クロメート皮膜とが強固に密着した層
を形成するため、塗膜密着性が向上する。ここで、基材
温度が１００℃に達するまでの時間が３秒未満では反応
時間が充分ではないため、強固に密着した層の形成が不
充分となり、充分な塗膜密着性が得られない。一方基材
温度が１００℃に達するまでの時間を７秒を越えて長く
しても、それ以上効果は変わらず、ライン長を伸ばすだ
けになってしまい、コスト高となってしまう。したがっ
て基材温度が１００℃に達するまでの時間は３〜７秒の
範囲内とした。The temperature rise during baking after application of the paint is from 3 to 7 from the start of baking, that is, the time when the material is put into the baking furnace until the substrate temperature reaches 100 ° C.
It must be controlled to be between seconds. In other words, during heating for baking, the paint is heated to near the boiling point while maintaining a liquid state, during which the paint reacts with the surface of the coating type chromate film, and this reaction causes the coating with the organic-inorganic composite film to be applied. Since a layer is firmly adhered to the mold chromate film, the adhesion of the coating film is improved. Here, if the time required for the substrate temperature to reach 100 ° C. is less than 3 seconds, the reaction time is not sufficient, and the formation of a firmly adhered layer becomes insufficient, and sufficient coating film adhesion cannot be obtained. On the other hand, if the time required for the substrate temperature to reach 100 ° C. is increased beyond 7 seconds, the effect does not change any more, only the line length is increased, and the cost is increased. Therefore, the time required for the substrate temperature to reach 100 ° C. was set in the range of 3 to 7 seconds.
【００３９】なお建浴後の有機無機複合塗料を塗布型ク
ロメート皮膜上に塗布して焼付ける際の焼付け温度（到
達温度）およびその温度での保持時間は特に限定するも
のではないが、通常は２００〜３００℃で３〜１５秒と
すれば良い。The baking temperature (attained temperature) and the holding time at that time when the organic-inorganic composite paint after the bath is applied onto the coating type chromate film and baked are not particularly limited. The temperature may be 3 to 15 seconds at 300 ° C.
【００４０】さらに、この発明の方法において使用され
る有機無機複合塗料の主成分である有機樹脂、ケイ酸も
しくはケイ酸塩の具体的種類は特に検定されるものでは
なく、従来から親水性塗膜に使用されているものを用い
ることができ、例えば有機樹脂としてはアクリル樹脂、
ポリビニルアルコール等を用いることができ、またケイ
酸としてはコロイダルシリカ等、さらにケイ酸塩として
は水ガラス等を用いることができる。一方水溶性潤滑樹
脂としては例えばポリエチレングリコール等のポリエー
テルを用いることができ、さらに界面活性剤としてはカ
ルボン酸塩、スルホン酸塩等の陰イオン界面活性剤ある
いはポリオキシエチレンアルキルフェニルエーテル等の
非イオン界面活性剤を用いることができ、そしてまた架
橋剤としてはエポキシ架橋剤、ウレタン架橋剤、メラミ
ン架橋剤あるいは炭酸ジルコニウム等の金属架橋剤等を
用いることができる。Furthermore, the specific types of the organic resin, silicic acid or silicate, which are the main components of the organic-inorganic composite coating used in the method of the present invention, are not particularly tested, and have been conventionally used for hydrophilic coatings. Can be used, for example, acrylic resin as the organic resin,
Polyvinyl alcohol or the like can be used, and colloidal silica or the like can be used as silicic acid, and water glass can be used as the silicate. On the other hand, as the water-soluble lubricating resin, for example, a polyether such as polyethylene glycol can be used, and as the surfactant, an anionic surfactant such as a carboxylate or a sulfonate or a non-ionic surfactant such as a polyoxyethylene alkylphenyl ether can be used. An ionic surfactant can be used, and as a crosslinking agent, an epoxy crosslinking agent, a urethane crosslinking agent, a melamine crosslinking agent, or a metal crosslinking agent such as zirconium carbonate can be used.
【００４１】また有機無機複合塗料を構成する各成分の
配合割合も特に限定されるものではないが、一般的には
固形分を２〜１０％とし、固形分中の各成分を下記のよ
うな配合比とすれば良い。但し固形分とは有機無機複合
塗料中に含まれる塗料成分の量、すなわち 固形分（％）＝（塗料成分／（塗料成分＋水分））×１
００ で表わされる量である。 ［固形分中の各成分の配合比］有機樹脂１００重量部に
対して： ケイ酸もしくはケイ酸塩 １００〜３５０重量部 水溶性潤滑樹脂 ２００〜３５０重量部 界面活性剤 １５〜 ５５重量部 架橋剤 １５〜 ４５重量部The mixing ratio of each component constituting the organic-inorganic composite coating material is not particularly limited. However, generally, the solid content is 2 to 10%, and each component in the solid content is as follows. What is necessary is just to make it a compounding ratio. However, the solid content is the amount of the paint component contained in the organic-inorganic composite paint, that is, the solid content (%) = (paint component / (paint component + moisture)) × 1
It is a quantity represented by 00. [Blending ratio of each component in solid content] Based on 100 parts by weight of organic resin: 100 to 350 parts by weight of silicic acid or silicate 200 to 350 parts by weight of water-soluble lubricating resin 15 to 55 parts by weight of surfactant Crosslinking agent 15 to 45 parts by weight
【００４２】[0042]
【実施例】実施例１ 基材として厚さ０．１１０ｍｍのＪＩＳ ３００３相当
のアルミニウム合金薄板を用意し、これに脱脂処理を施
した後、水洗、乾燥を行なった。その後塗布型クロメー
ト液（日本ペイント製：ＳＡＴ２４７）を基材表面に塗
布し、焼付け乾燥を行なった。ここで、塗布型クロメー
ト液の塗布時の液温は２５℃、塗布から焼付け開始まで
の時間は１５秒とし、さらに焼付け乾燥を１５℃／秒の
昇温速度で焼付け乾燥温度１５０℃に達するまで行なっ
た。なお塗布型クロメート液の塗布量は、Ｃｒ量が２０
ｍｇ／ｍ2 となるように調整した。このようにして基材
表面に塗布型クロメート皮膜を形成した後、その塗布型
クロメート皮膜上に有機無機複合塗料を塗布した。この
有機無機複合塗料の建浴条件および塗布・焼付け条件は
次のように定めた。EXAMPLE 1 An aluminum alloy thin plate equivalent to JIS 3003 having a thickness of 0.110 mm was prepared as a base material, degreased, washed with water, and dried. Thereafter, a coating type chromate liquid (manufactured by Nippon Paint Co., Ltd .: SAT247) was applied to the surface of the substrate, and baked and dried. Here, the liquid temperature at the time of application of the application type chromate liquid is 25 ° C., the time from application to the start of baking is 15 seconds, and baking and drying is performed at a heating rate of 15 ° C./sec until the baking and drying temperature reaches 150 ° C. Done. The coating amount of the coating type chromate liquid was 20% Cr.
It was adjusted to be mg / m 2 . After forming a coating type chromate film on the substrate surface in this way, an organic-inorganic composite paint was applied on the coating type chromate film. The bathing conditions and the application and baking conditions of this organic-inorganic composite paint were determined as follows.
【００４３】有機無機複合塗料の建浴時の液温は表１の
実施例１−１，１−２、比較例１−１〜１−３に示すよ
うに種々変化させた。なお各例において、有機無機複合
塗料を構成する各成分の保持温度、および塗料建浴後の
保持温度も、表１に示した各例の液温と実質的に等しい
ものとした。また各成分の添加順序は、［水］→［水溶
性潤滑樹脂］→［有機樹脂］→［界面活性剤］→［架橋
剤］→［ケイ酸塩］の順とし、各成分の添加ごとに１０
分の撹拌を行なった。The liquid temperature of the organic-inorganic composite paint during bathing was varied as shown in Examples 1-1 and 1-2 and Comparative Examples 1-1 to 1-3 in Table 1. In each example, the holding temperature of each component constituting the organic-inorganic composite coating and the holding temperature after the coating bath was also substantially equal to the liquid temperature of each example shown in Table 1. The order of addition of each component is [water] → [water-soluble lubricating resin] → [organic resin] → [surfactant] → [crosslinking agent] → [silicate]. 10
Minutes of stirring.
【００４４】一方塗布直前の基材の温度は２０℃に保持
し、塗布後焼付け開始までの時間（タクトタイム）は１
５秒とし、さらに焼付け開始から基材温度が１００℃に
達するまでの時間は５秒とした。なお有機無機複合塗料
の建浴後、塗装終了までの時間はいずれも３時間であっ
た。また有機無機複合塗料の固形分は４％とし、固形分
中の各成分の種類および配合割合は次の通りである。 有機樹脂として： ポリアクリル酸 １００重量部 ケイ酸もしくはケイ酸塩として： Ｋ2Ｏ・３．５ＳｉＯ2 ２８０重量部 水溶性潤滑樹脂として： ポリエチレングリコール ２８０重量部 界面活性剤として： ジイソオクチルスルホコハク酸Ｎａ ２０重量部 架橋剤として： 炭酸ジルコニウムアンモニウム ３０重量部On the other hand, the temperature of the base material immediately before the application is maintained at 20 ° C., and the time (tact time) from the application to the start of baking is 1 hour.
The time was 5 seconds, and the time from the start of baking until the substrate temperature reached 100 ° C. was 5 seconds. The time from the bathing of the organic-inorganic composite paint to the end of the coating was 3 hours in each case. The solid content of the organic-inorganic composite paint was 4%, and the types and blending ratios of each component in the solid content were as follows. As an organic resin: polyacrylic acid 100 parts by weight As silicic acid or silicate: K 2 O.3.5 SiO 2 280 parts by weight As a water-soluble lubricating resin: polyethylene glycol 280 parts by weight As a surfactant: diisooctyl sulfosuccinic acid Na 20 parts by weight As a crosslinking agent: ammonium zirconium carbonate 30 parts by weight
【００４５】得られた塗装板に対して、以下に示す試験
を行なった。 密着性試験 塗膜面にツメを垂直に強くあて、２ｃｍの長さに同一個
所を２往復摺擦する。次に隣接する部分を同様に摺擦す
る。これを幅３ｃｍとなるまで行ない、摺擦した部分の
外観を目視により判定した。判定基準は次の通りであ
る。 ○：外観に変化無し △：塗膜面にキズが入る ×：塗膜が剥離する 塗膜白化性試験 純水４０μｌを塗膜上に滴下し、指で３５φの円を描く
ように５０回摺擦し、乾燥後の塗膜の白化状態を目視に
より判定した。判定基準は次の通りである。 ○：白化無し △：弱い白化 ×：白化 塗膜外観評価 塗膜表面１ｄｍ2 の範囲内の塗装筋ムラの数を目視によ
り判定した。判定基準は次の通りである。 ○：０個 △：１〜５個 ×：６個以上The following tests were performed on the obtained coated plates. Adhesion test A nail is strongly applied vertically to the coating film surface, and the same portion is rubbed two times in a length of 2 cm. Next, the adjacent portion is similarly rubbed. This was performed until the width became 3 cm, and the appearance of the rubbed portion was visually determined. The criteria are as follows. ○: No change in appearance △: Scratch on coating film ×: Peel coating film Coating whitening test 40 μl of pure water was dropped on the coating film, and rubbed 50 times with a finger to draw a circle of 35φ The whitening state of the coating film after rubbing and drying was visually determined. The criteria are as follows. ：: no whitening Δ: weak whitening ×: whitening Evaluation of appearance of coating film The number of uneven coating lines within a range of 1 dm 2 of the coating film surface was visually judged. The criteria are as follows. ○: 0 pieces △: 1 to 5 pieces ×: 6 pieces or more
【００４６】これらの試験結果を表１中に示す。The test results are shown in Table 1.
【００４７】[0047]
【表１】 [Table 1]
【００４８】表１に示されるように、建浴時の有機無機
複合塗料の各成分の温度および建浴後の塗料の保持温度
を含めて、有機無機複合塗料の温度が２０〜２５℃の範
囲内にある実施例１−１，１−２の場合は、塗膜の密着
性が良好でかつ塗膜白化もなく、さらに塗装外観も良好
であった。これに対し比較例１−１，１−２は液温が低
かった例であり、この場合は各性能がいずれも劣ってい
た。また比較例１−３は液温が高過ぎた例であるが、こ
の場合は密着性が若干劣り、また塗装外観が劣ってい
た。As shown in Table 1, the temperature of the organic-inorganic composite paint is in the range of 20 to 25 ° C., including the temperature of each component of the organic-inorganic composite paint at the time of bathing and the holding temperature of the paint after the bathing. In Examples 1-1 and 1-2, the adhesion of the coating film was good, there was no whitening of the coating film, and the coating appearance was also good. On the other hand, Comparative Examples 1-1 and 1-2 are examples in which the liquid temperature was low, and in this case, each performance was inferior. Comparative Example 1-3 is an example in which the liquid temperature was too high. In this case, the adhesion was slightly inferior and the coating appearance was inferior.
【００４９】実施例２ 有機無機複合塗料の温度を、建浴時の各成分の保持温度
および建浴後の保持温度を含めて２２℃で一定とし、ま
た建浴時における各成分の添加順序を表２の実施例２−
１，２−２、比較例２−１，２−２に示すように種々異
ならしめた点以外は、実施例１と同様に実施した。得ら
れた塗装板について、実施例１と同様な試験を行なった
ところ、表２に示す結果が得られた。Example 2 The temperature of the organic-inorganic composite coating material was kept constant at 22 ° C., including the holding temperature of each component during the bathing and the holding temperature after the bathing. Example 2 of 2
Examples 1 and 2 and Comparative Examples 2-1 and 2-2 were carried out in the same manner as in Example 1 except for various points. When a test similar to that of Example 1 was performed on the obtained coated plate, the results shown in Table 2 were obtained.
【００５０】[0050]
【表２】 [Table 2]
【００５１】表２から明らかなように、有機無機複合塗
料の建浴にあたって、［水→水溶性潤滑樹脂→有機樹脂
→界面活性剤→架橋剤→ケイ酸塩］の添加順序とした実
施例２−１、および［水→水溶性潤滑樹脂→界面活性剤
→有機樹脂→架橋剤→ケイ酸塩］の添加順序とした実施
例２−２では、塗膜の密着性が良好でかつ塗膜白化もな
く、さらには塗膜外観も良好であることが判明した。こ
れに対し［水→ケイ酸塩→有機樹脂→界面活性剤→架橋
剤→水溶性潤滑樹脂］の添加順序とした比較例２−１、
および［水→水溶性潤滑樹脂→ケイ酸塩→架橋剤→界面
活性剤→有機樹脂］の添加順序とした比較例２−２で
は、塗膜の密着性が劣るとともに塗膜白化が生じ、また
塗装外観も劣っていた。As is clear from Table 2, in the bath for preparing the organic-inorganic composite paint, Example 2 was used in the order of adding [water → water-soluble lubricating resin → organic resin → surfactant → crosslinking agent → silicate]. -1 and Example 2-2 in which the order of addition of [water → water-soluble lubricating resin → surfactant → organic resin → crosslinking agent → silicate], the adhesion of the coating film was good and the coating film was whitened. It was also found that the coating film appearance was good. On the other hand, Comparative Example 2-1, in which the order of addition of [water → silicate → organic resin → surfactant → crosslinking agent → water-soluble lubricating resin],
In Comparative Example 2-2 in which the order of addition of [water → water-soluble lubricating resin → silicate → crosslinking agent → surfactant → organic resin], the adhesion of the coating film was poor and the coating film was whitened. The paint appearance was also poor.
【００５２】実施例３ 有機無機複合塗料の温度を、建浴時の各成分の保持温度
および建浴後の保持温度を含めて２２℃で一定とし、建
浴するにあたっての各成分の添加後の撹拌時間を表３の
実施例３−１，３−２、比較例３−１，３−２に示すよ
うに種々変化させた点以外は、実施例１と同様に実施し
た。得られた塗装板について、実施例１と同様な試験を
行なったところ、表３中に示す結果が得られた。Example 3 The temperature of the organic-inorganic composite paint was kept constant at 22 ° C., including the holding temperature of each component during the bathing and the holding temperature after the bathing. Example 3 was carried out in the same manner as in Example 1 except that the time was variously changed as shown in Examples 3-1 and 3-2 and Comparative Examples 3-1 and 3-2 in Table 3. When a test similar to that in Example 1 was performed on the obtained coated plate, the results shown in Table 3 were obtained.
【００５３】[0053]
【表３】 [Table 3]
【００５４】表３から明らかなように、有機無機複合塗
料の建浴にあたって、各成分添加後の撹拌時間を５〜１
０分の範囲内とした実施例３−１，３−２では、塗膜の
密着性が優れるとともに、塗膜の白化もなく、さらに塗
膜の外観も優れていることが判明した。これに対し撹拌
時間が５分に満たない比較例３−１，３−２では、塗膜
白化が生じていしまい、また塗膜の密着性も劣ってい
た。As is clear from Table 3, in the bathing of the organic-inorganic composite paint, the stirring time after the addition of each component was 5 to 1%.
In Examples 3-1 and 3-2 in the range of 0 minutes, it was found that the adhesion of the coating film was excellent, the coating film was not whitened, and the appearance of the coating film was also excellent. On the other hand, in Comparative Examples 3-1 and 3-2 in which the stirring time was less than 5 minutes, whitening of the coating film occurred and the adhesion of the coating film was poor.
【００５５】実施例４ 有機無機複合塗料の温度を、建浴時の各成分の保持温度
および建浴後の保持温度を含めて２２℃で一定とし、建
浴後の有機無機複合塗料を塗布型クロメート皮膜上に塗
布する直前の基材の温度を、表４の実施例４−１，４−
２、比較例４−１〜４−３に示すように種々異ならしめ
た点以外は、実施例１と同様に実施した。得られた塗装
板について、実施例１と同様な試験を行なったところ、
表４中に示す結果が得られた。Example 4 The temperature of the organic-inorganic composite paint was kept constant at 22 ° C. including the holding temperature of each component during the bathing and the holding temperature after the bathing. The temperature of the base material immediately before the application on the top was determined by comparing Examples 4-1 and 4-
2. The same operation as in Example 1 was carried out, except for various differences as shown in Comparative Examples 4-1 to 4-3. When a test similar to that of Example 1 was performed on the obtained coated plate,
The results shown in Table 4 were obtained.
【００５６】[0056]
【表４】 [Table 4]
【００５７】表４から明らかなように、有機無機複合塗
料塗布直前の基材温度を１５〜２５℃の範囲内とした実
施例４−１，４−２の場合は、塗膜の密着性が優れると
ともに塗膜の白化もなく、また塗装外観も良好であっ
た。これに対し有機無機複合塗料塗布時の基材温度を１
５℃未満とした比較例４−１，４−２および２５℃を越
える高温とした比較例４−３では、いずれも塗装外観に
劣り、また塗膜密着性に劣るとともに、塗膜の白化も生
じてしまった。As is apparent from Table 4, in the case of Examples 4-1 and 4-2 in which the substrate temperature immediately before the application of the organic-inorganic composite coating material was in the range of 15 to 25 ° C., the adhesion of the coating film was poor. The coating was excellent, there was no whitening of the coating film, and the coating appearance was good. On the other hand, when the organic-inorganic composite paint was applied, the substrate temperature was set to 1
In Comparative Examples 4-1 and 4-2 in which the temperature was lower than 5 ° C. and Comparative Example 4-3 in which the temperature was higher than 25 ° C., all of the coatings were inferior in appearance and inferior in coating film adhesion, and whitened. It has happened.
【００５８】実施例５ 有機無機複合塗料の温度を、建浴時の各成分の保持温度
および建浴後の保持温度を含めて２２℃で一定とし、建
浴後の有機無機複合塗料を塗布型クロメート皮膜上に塗
布した後、焼付けを開始するまでの時間（タクトタイ
ム）を、表５の実施例５−１〜５−３、比較例５−１に
示すように種々異ならしめた点以外は、実施例１と同様
に実施した。得られた塗装板について、実施例１と同様
な試験を行なったところ、表５中に示す結果が得られ
た。Example 5 The temperature of the organic-inorganic composite paint was kept constant at 22 ° C., including the holding temperature of each component during the bathing and the holding temperature after the bathing. The time (tact time) until the start of baking after application on the top was varied as shown in Examples 5-1 to 5-3 in Table 5 and Comparative Example 5-1. Performed as in Example 1. When a test similar to that of Example 1 was performed on the obtained coated plate, the results shown in Table 5 were obtained.
【００５９】[0059]
【表５】 [Table 5]
【００６０】表５から明らかなように、有機無機複合塗
料塗布後焼付け開始までのタクトタイムを１〜６０秒の
範囲内とした実施例５−１〜５−３の場合は、いずれも
塗膜の密着性が優れるとともに塗膜の白化もなく、また
塗装外観も良好であった。これに対しタクトタイムが
０．４秒と短かった比較例５−１では、塗膜密着性およ
び塗装外観が劣り、また塗膜の白化も生じてしまった。As is apparent from Table 5, in Examples 5-1 to 5-3, the tact time from the application of the organic-inorganic composite coating to the start of baking was within the range of 1 to 60 seconds. Was excellent in adhesion and no whitening of the coating film, and the appearance of the coating was good. On the other hand, in Comparative Example 5-1 in which the tact time was as short as 0.4 second, the adhesion of the coating film and the appearance of the coating film were poor, and the coating film was whitened.
【００６１】実施例６ 有機無機複合塗料の温度を、建浴時の各成分の保持温度
および建浴後の保持温度を含めて２２℃で一定とし、建
浴後の有機無機複合塗料を塗布型クロメート皮膜上に塗
布してから焼付けを行なうにあたり、焼付け開始から基
材温度が１００℃に達するまでの昇温時間を、表６の実
施例６−１，６−２、比較例６−１，６−２に示すよう
に種々異ならしめた点以外は、実施例１と同様に実施し
た。得られた塗装板について、実施例１と同様な試験を
行なったところ、表６中に示す結果が得られた。Example 6 The temperature of the organic-inorganic composite paint was kept constant at 22 ° C., including the holding temperature of each component during the bathing and the holding temperature after the bathing. When performing baking after coating on top, the heating time from the start of baking until the base material temperature reaches 100 ° C. was determined according to Examples 6-1 and 6-2 in Table 6 and Comparative Examples 6-1 and 6--6. Example 2 was carried out in the same manner as in Example 1, except for various points as shown in FIG. When a test similar to that of Example 1 was performed on the obtained coated plate, the results shown in Table 6 were obtained.
【００６２】[0062]
【表６】 [Table 6]
【００６３】表６から明らかなように、有機無機複合塗
料の焼付け時における１００℃までの昇温時間を３〜７
秒の範囲内とした実施例６−１，６−２の場合は、塗膜
の密着性が優れるとともに塗膜の白化もなく、また塗装
外観も良好であった。これに対し焼付け時における昇温
時間を３秒未満とした比較例６−１，６−２では、いず
れも塗膜密着性、塗装外観に劣り、また塗膜の白化も生
じてしまった。As is evident from Table 6, the temperature rise time up to 100 ° C. during baking of the organic-inorganic composite paint was 3 to 7 times.
In the case of Examples 6-1 and 6-2 in the range of seconds, the adhesion of the coating film was excellent, the coating film was not whitened, and the appearance of the coating was good. On the other hand, in Comparative Examples 6-1 and 6-2 in which the temperature rise time during baking was less than 3 seconds, the coating film adhesion and the coating appearance were all inferior, and the coating film was whitened.
【００６４】[0064]
【発明の効果】この発明の熱交換器用プレコートフィン
材の製造方法によれば、下地耐食性皮膜として予め塗布
型クロメート皮膜を形成し、その後塗布型クロメート皮
膜表面に、親水性塗料として、ケイ酸もしくはケイ酸塩
と有機樹脂とを含む有機無機複合塗料を塗布して焼付
け、これによって親水性塗膜を形成するにあたり、親水
性塗膜である有機無機複合皮膜の下地に対する密着性を
確実かつ安定して向上させて、低粘度の揮発性プレス油
を用いた場合でも成形性、潤滑性を安定して向上させる
ことができ、また親水性、親水持続性を良好であってか
つまた塗膜外観も良好でさらに臭気発生も少ない親水性
塗膜を形成することができる。According to the method for producing a precoated fin material for a heat exchanger of the present invention, a coating type chromate film is formed in advance as a base corrosion-resistant film, and thereafter, a silica or a silicic acid as a hydrophilic coating is formed on the surface of the coating type chromate film. Applying and baking an organic-inorganic composite coating containing a silicate and an organic resin, and forming a hydrophilic coating by this, ensures that the adhesion of the hydrophilic coating organic-inorganic composite coating to the substrate is stable and stable. Even when a low-viscosity volatile press oil is used, the moldability and lubricity can be stably improved, and the hydrophilicity and hydrophilicity persistence are good, and the coating film appearance is also improved. It is possible to form a hydrophilic coating film which is favorable and generates less odor.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｃ２３Ｃ 22/30 Ｃ２３Ｃ 22/30 (72)発明者 佐々木 延義 東京都墨田区錦糸１丁目２番１号 スカイ アルミニウム株式会社内 Ｆターム(参考） 4D075 BB22Y BB23Y BB28Z BB74X BB93Y BB93Z BB95Z CA09 CA13 CA33 CA37 DA03 DA06 DB07 DC19 EA06 EB19 EB22 EB37 EC03 EC35 EC37 4F100 AA03C AA08 AA08H AA22B AB10A AB31A AH08 AH08H AK01C AK25 AK54 BA03 BA07 BA10A BA10C CA02C CA18C EH46B EH46C EH462 EJ69B EJ692 GB48 GB51 JB02 JB05 JB05C JB09C JK06 JK16 JK16C JL01 YY00A YY00C 4K026 AA09 BA01 BA06 BA12 BB01 BB02 BB06 CA16 CA20 CA27 CA39 CA41 DA02 DA11 DA13 EB08 EB11 ──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) C23C 22/30 C23C 22/30 (72) Inventor Nobuyoshi Sasaki 1-2-1, Kinshi, Sumida-ku, Tokyo F-term in Sky Aluminum Co., Ltd. (reference) 4D075 BB22Y BB23Y BB28Z BB74X BB93Y BB93Z BB95Z CA09 CA13 CA33 CA37 DA03 DA06 DB07 DC19 EA06 EB19 EB22 EB37 EC03 EC35 EC37 4F100 AA03C AA08 AA08A AABAAAB ABABAH CA18C EH46B EH46C EH462 EJ69B EJ692 GB48 GB51 JB02 JB05 JB05C JB09C JK06 JK16 JK16C JL01 YY00A YY00C 4K026 AA09 BA01 BA06 BA12 BB01 BB02 BB06 CA16 CA20 CA27 CA11 CA13 DA02 DA11
Claims (2)
クロメート皮膜を形成しておき、その塗布型クロメート
皮膜表面にケイ酸もしくはケイ酸塩と有機樹脂とを含有
する有機無機複合塗料を塗布して焼付けることにより、
塗布型クロメート皮膜上に親水性を有する有機無機複合
皮膜を形成する熱交換器用プレコートフィン材の製造方
法において、 有機無機複合塗料を建浴するにあたり、有機無機複合塗
料を構成すべき各成分をそれぞれ２０〜２５℃の範囲内
の温度で保持しながら、先ず水に水溶性潤滑樹脂を添加
し、次いで界面活性剤を添加した後、有機樹脂を添加
し、その後架橋剤を添加してからケイ酸もしくはケイ酸
塩を添加し、かつこれらの各成分を添加する毎にそれぞ
れ５〜１０分間撹拌することによって、有機無機複合塗
料を建浴し、その後も有機無機複合塗料の温度を２０〜
２５℃の範囲内に保持しながら、全成分の添加混合の終
了から１０時間以内に塗布型クロメート皮膜上に塗布・
焼付けを行ない、しかもその塗布・焼付けにあたって、
塗布直前のアルミニウム合金基材の温度を１５〜２５℃
の範囲内に保持するとともに、塗布後焼付け開始までの
時間を１〜６０秒の範囲内とし、さらに焼付け開始から
アルミニウム合金基材の温度が１００℃になるまでの時
間を３〜７秒の範囲内となるようにして塗布・焼付けを
行なうことを特徴とする、熱交換器用プレコートフィン
材の製造方法。1. A coating type chromate film is previously formed on the surface of an aluminum alloy substrate, and an organic-inorganic composite coating containing silicic acid or silicate and an organic resin is applied to the coating type chromate film surface. By baking,
In the method for producing a pre-coated fin material for a heat exchanger that forms a hydrophilic organic-inorganic composite coating on a coating type chromate coating, the components constituting the organic-inorganic composite coating are separately While maintaining the temperature within the range of 20 to 25 ° C., first add a water-soluble lubricating resin to water, then add a surfactant, add an organic resin, and then add a crosslinking agent, and then add silicate. Alternatively, the organic-inorganic composite paint is built up by adding a silicate and stirring for 5 to 10 minutes each time each of these components is added, and thereafter, the temperature of the organic-inorganic composite paint is kept at 20 to
While maintaining the temperature within the range of 25 ° C., apply it on the coating type chromate film within 10 hours after the completion of addition and mixing of all components.
Baking, and in applying and baking,
The temperature of the aluminum alloy substrate immediately before application is 15 to 25 ° C
And the time from the start of baking to the start of baking is set within a range of 1 to 60 seconds, and the time from the start of baking until the temperature of the aluminum alloy base material reaches 100 ° C. is within a range of 3 to 7 seconds. A method for producing a precoated fin material for a heat exchanger, wherein the coating and baking are performed inside.
クロメート皮膜を形成しておき、その塗布型クロメート
皮膜表面にケイ酸もしくはケイ酸塩と有機樹脂とを含有
する有機無機複合塗料を塗布して焼付けることにより、
塗布型クロメート皮膜上に親水性を有する有機無機複合
皮膜を形成する熱交換器用プレコートフィン材の製造方
法において、 有機無機複合塗料を建浴するにあたり、有機無機複合塗
料を構成すべき各成分をそれぞれ２０〜２５℃の範囲内
の温度で保持しながら、先ず水に水溶性潤滑樹脂を添加
し、次いで有機樹脂を添加した後、界面活性剤を添加
し、その後架橋剤を添加してからケイ酸もしくはケイ酸
塩を添加し、かつこれらの各成分を添加する毎にそれぞ
れ５〜１０分間撹拌することによって、有機無機複合塗
料を建浴し、その後も有機無機複合塗料の温度を２０〜
２５℃の範囲内に保持しながら、全成分の添加混合の終
了から１０時間以内に塗布型クロメート皮膜上に塗布・
焼付けを行ない、しかもその塗布・焼付けにあたって、
塗布直前のアルミニウム合金基材の温度を１５〜２５℃
の範囲内に保持するとともに、塗布後焼付け開始までの
時間を１〜６０秒の範囲内とし、さらに焼付け開始から
アルミニウム合金基材の温度が１００℃になるまでの時
間を３〜７秒の範囲内となるようにして塗布・焼付けを
行なうことを特徴とする、熱交換器用プレコートフィン
材の製造方法。2. A coating type chromate film is previously formed on the surface of an aluminum alloy substrate, and an organic-inorganic composite coating containing silicic acid or silicate and an organic resin is applied to the coating type chromate film surface. By baking,
In the method for producing a pre-coated fin material for a heat exchanger that forms a hydrophilic organic-inorganic composite coating on a coating type chromate coating, the components constituting the organic-inorganic composite coating are separately While maintaining the temperature within the range of 20 to 25 ° C., a water-soluble lubricating resin is first added to water, then an organic resin is added, a surfactant is added, and then a crosslinking agent is added. Alternatively, the organic-inorganic composite paint is built up by adding a silicate and stirring for 5 to 10 minutes each time each of these components is added, and thereafter, the temperature of the organic-inorganic composite paint is kept at 20 to
While maintaining the temperature within the range of 25 ° C., apply it on the coating type chromate film within 10 hours after the completion of addition and mixing of all components.
Baking, and in applying and baking,
The temperature of the aluminum alloy substrate immediately before application is 15 to 25 ° C
And the time from the start of baking to the start of baking is set within a range of 1 to 60 seconds, and the time from the start of baking until the temperature of the aluminum alloy base material reaches 100 ° C. is within a range of 3 to 7 seconds. A method for producing a precoated fin material for a heat exchanger, wherein the coating and baking are performed inside.
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|---|---|---|---|
| JP22479099A JP3671339B2 (en) | 1999-08-09 | 1999-08-09 | Manufacturing method of precoat fin material for heat exchanger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22479099A JP3671339B2 (en) | 1999-08-09 | 1999-08-09 | Manufacturing method of precoat fin material for heat exchanger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001050689A true JP2001050689A (en) | 2001-02-23 |
| JP3671339B2 JP3671339B2 (en) | 2005-07-13 |
Family
ID=16819250
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|---|---|---|---|
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003301273A (en) * | 2002-04-10 | 2003-10-24 | Nisshin Steel Co Ltd | Metal sheet with hydrophilic coating |
| JP2005103890A (en) * | 2003-09-30 | 2005-04-21 | Furukawa Sky Kk | Fluoroplastic resin pracoated metal sheet excellent in antistaining properties |
| JP2010105329A (en) * | 2008-10-31 | 2010-05-13 | Furukawa-Sky Aluminum Corp | Aluminum-coated plate |
| WO2010110261A1 (en) * | 2009-03-24 | 2010-09-30 | 株式会社神戸製鋼所 | Aluminum fin material for heat exchanger |
| JP6085831B1 (en) * | 2016-05-16 | 2017-03-01 | 日本表面化学株式会社 | Chemical film treatment agent and method for producing the same |
| JP2019138623A (en) * | 2019-05-16 | 2019-08-22 | 三菱アルミニウム株式会社 | Heat exchanger and manufacturing method of heat exchanger |
-
1999
- 1999-08-09 JP JP22479099A patent/JP3671339B2/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003301273A (en) * | 2002-04-10 | 2003-10-24 | Nisshin Steel Co Ltd | Metal sheet with hydrophilic coating |
| JP2005103890A (en) * | 2003-09-30 | 2005-04-21 | Furukawa Sky Kk | Fluoroplastic resin pracoated metal sheet excellent in antistaining properties |
| JP2010105329A (en) * | 2008-10-31 | 2010-05-13 | Furukawa-Sky Aluminum Corp | Aluminum-coated plate |
| WO2010110261A1 (en) * | 2009-03-24 | 2010-09-30 | 株式会社神戸製鋼所 | Aluminum fin material for heat exchanger |
| CN102378893A (en) * | 2009-03-24 | 2012-03-14 | 株式会社神户制钢所 | Aluminum fin material for heat exchanger |
| JP6085831B1 (en) * | 2016-05-16 | 2017-03-01 | 日本表面化学株式会社 | Chemical film treatment agent and method for producing the same |
| JP2017206722A (en) * | 2016-05-16 | 2017-11-24 | 日本表面化学株式会社 | Chemical conversion coating treatment agent and method for manufacturing the same |
| JP2019138623A (en) * | 2019-05-16 | 2019-08-22 | 三菱アルミニウム株式会社 | Heat exchanger and manufacturing method of heat exchanger |
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| JP3671339B2 (en) | 2005-07-13 |
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