JPH07227567A - Coating method - Google Patents
Coating methodInfo
- Publication number
- JPH07227567A JPH07227567A JP2014094A JP2014094A JPH07227567A JP H07227567 A JPH07227567 A JP H07227567A JP 2014094 A JP2014094 A JP 2014094A JP 2014094 A JP2014094 A JP 2014094A JP H07227567 A JPH07227567 A JP H07227567A
- Authority
- JP
- Japan
- Prior art keywords
- coating
- viscosity
- organic solvent
- paint
- coating composition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は塗装方法に関し、詳しく
はハイソリッド塗料に最適な塗装方法を提供するもので
ある。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coating method, and more particularly to a coating method most suitable for high solid paint.
【０００２】[0002]
【従来の技術】従来より、自動車や家庭用電気製品等の
塗装に用いられる架橋硬化型塗料として、耐候性及び外
観性に優れるアクリル系塗料が多く用いられている。こ
のアクリル系塗料には、アクリル酸ブチル、メタクリル
酸メチル又はメタクリル酸ブチル等の（メタ）アクリル
酸アルキルと、メタクリル酸２−ヒドロキシエチル又は
メタクリル酸２−ヒドロキシプロピル等の官能基含有単
量体とをラジカル共重合して得られるアクリル樹脂が一
般的に用いられている。そして、このようなアクリル樹
脂の有機溶剤溶液に、メラミン樹脂又は多価イソシアネ
ート等の加熱型架橋剤を加えて得られる塗料は、塗装後
焼き付けることにより、３次元網目構造を有する強固な
塗膜を形成する。2. Description of the Related Art Conventionally, acrylic coatings having excellent weather resistance and appearance have been widely used as cross-linking curable coatings used for coating automobiles and household electric appliances. This acrylic paint includes an alkyl (meth) acrylate such as butyl acrylate, methyl methacrylate or butyl methacrylate, and a functional group-containing monomer such as 2-hydroxyethyl methacrylate or 2-hydroxypropyl methacrylate. Acrylic resins obtained by radical copolymerization of are generally used. Then, a coating obtained by adding a heating type crosslinking agent such as a melamine resin or a polyvalent isocyanate to an organic solvent solution of such an acrylic resin is baked after coating to form a strong coating film having a three-dimensional network structure. Form.
【０００３】ところで、スプレー塗装用塗料における有
機溶剤に期待される効果の１つに、スプレー塗工から造
膜過程における塗料の粘度調整効果がある。すなわち、
一般的な従来の塗料は、スプレーガンから噴射される
前、つまり初期の状態で、塗料との質量比率にて約４０
〜６０ｗｔ％もの多量の有機溶剤を含み、低粘度に調整
されている。これにより、塗料をスプレーガンから噴射
するスプレー塗工時に、液状の塗料を円滑に霧状に微粒
化することができる。なお、初期状態の塗料粘度が高す
ぎて、スプレー塗工時に塗料の円滑な微粒化がなされな
いと、形成される塗膜において艶無し等の外観不良の原
因となる。By the way, one of the effects expected from an organic solvent in a paint for spray coating is an effect of adjusting the viscosity of the paint in the process of spray coating to film formation. That is,
A typical conventional paint is about 40 in mass ratio with the paint before being sprayed from the spray gun, that is, in the initial state.
It contains a large amount of organic solvent such as ~ 60 wt% and is adjusted to a low viscosity. This makes it possible to smoothly atomize the liquid paint into a mist when spraying the paint from the spray gun. In addition, if the paint viscosity in the initial state is too high and the paint is not atomized smoothly during spray coating, it will cause a poor appearance such as dullness in the formed coating film.
【０００４】そして、スプレーガンから噴射されて微粒
化した塗料は、被塗物まで飛行している間に沸点の低い
有機溶剤の一部が蒸発し、粘度が上昇する。この増粘効
果により、塗料が被塗物に塗着する際の垂れが抑えられ
る。この一方で、被塗物に塗着した塗料において、有機
溶剤量が極端に少なくなり粘度が極端に増大している
と、塗料の流動性の低下により、塗膜の塗面が凹凸状に
なって外観不良となる。このように、塗料中の有機溶剤
は、スプレー塗工から造膜過程における塗料の粘度を良
好に調整して、スプレー塗工時の円滑な塗料の微粒化、
塗着の際の垂れの防止、及び平滑な塗面の形成等に貢献
する。In the coating material sprayed from the spray gun and atomized, a part of the organic solvent having a low boiling point is evaporated and the viscosity is increased while flying to the object to be coated. This thickening effect suppresses sagging when the coating material is applied to the object to be coated. On the other hand, when the amount of organic solvent in the coating material applied to the object is extremely small and the viscosity is extremely high, the coating surface of the coating film becomes uneven due to a decrease in the fluidity of the coating material. Will result in poor appearance. In this way, the organic solvent in the paint, adjusting the viscosity of the paint in the film formation process from spray coating well, smooth atomization of the paint during spray coating,
It contributes to the prevention of sagging during coating and the formation of a smooth coating surface.
【０００５】しかし、上記したような効果が期待される
有機溶剤も、一方では、蒸発することによる公害問題が
クローズアップされるとともに、省資源の理由から使用
量を減らすことが必要となってきている。そこで水性塗
料やハイソリッド塗料の開発が活発に行われている。と
ころが水性塗料では、溶媒である水は有機溶剤に比べて
蒸発速度が小さいために、乾燥が遅く塗膜となるまでの
時間が長いという問題がある。またスプレーされてから
被塗物に塗着するまでの間に揮発する量も僅かであり、
塗着後の粘度上昇が小さく垂れが生じ易いという不具合
もある。On the other hand, however, the organic solvent, which is expected to have the above-mentioned effects, needs to be used in a reduced amount for the purpose of resource saving as the pollution problem due to evaporation is highlighted. There is. Therefore, water-based paints and high solid paints are being actively developed. However, the water-based paint has a problem that water, which is a solvent, has a lower evaporation rate than an organic solvent, so that it is slow to dry and takes a long time to form a coating film. In addition, the amount of volatilization from the time it is sprayed until it is applied to the object to be coated is small,
There is also a problem that the viscosity increase after application is small and sagging easily occurs.
【０００６】そこで特開平3-262568号公報には、塗装ガ
ンから吐出されて飛行中の塗粒に波長が２〜１０3 μｍ
の電磁波を照射し、電磁波による加熱により塗粒中の溶
媒を揮散させる塗装方法が開示されている。この塗装方
法によれば、塗粒中の溶媒は電磁波により瞬時に加熱さ
れて揮散するため、被塗物に塗着した時点で塗粒の粘度
はかなり上昇している。したがって水性塗料であっても
塗着後の粘度上昇が大きく、垂れを防止することができ
る。In view of this, Japanese Patent Laid-Open No. 3-262568 discloses that coating particles discharged from a coating gun and flying have a wavelength of 2 to 10 3 μm.
The coating method of irradiating the electromagnetic wave and volatilizing the solvent in the coating particles by heating with the electromagnetic wave is disclosed. According to this coating method, the solvent in the coated particles is instantaneously heated and volatilized by the electromagnetic wave, so that the viscosity of the coated particles is considerably increased when the solvent is applied to the object to be coated. Therefore, even with a water-based paint, the increase in viscosity after application is large and dripping can be prevented.
【０００７】またハイソリッド塗料においては、有機溶
剤量を単純に減らす方法では、上述した有機溶剤の有用
な働きとの兼合から限界がある。つまり、有機溶剤量を
減らし、その分だけ単純に樹脂濃度を高めた場合、初期
状態の塗料粘度が高くなり過ぎて、スプレー塗工時に円
滑な微粒化がなされずに艶無し等の外観不良が発生した
りする。したがって樹脂などの塗膜形成要素自体を低粘
度化し、有機溶剤量を少なくしてスプレー塗工可能とす
る必要がある。Further, in the high solid paint, the method of simply reducing the amount of the organic solvent has a limit in view of the useful function of the above-mentioned organic solvent. In other words, if the amount of organic solvent is reduced and the resin concentration is simply increased by that amount, the viscosity of the paint in the initial state becomes too high, and smooth atomization is not performed during spray coating, resulting in poor appearance such as matteness. Occur. Therefore, it is necessary to reduce the viscosity of the coating film-forming element itself such as resin and reduce the amount of organic solvent to enable spray coating.
【０００８】[0008]
【発明が解決しようとする課題】ところで、生産ライン
における塗装の場合には、塗装条件を一定に保つために
塗料は常に循環されている。したがって循環を効率良く
行うために、そしてスプレー時の塗装適性を保つため
に、塗料の粘度は１００〜３００ｃＰと低粘度に調整す
る必要がある。By the way, in the case of coating in a production line, the coating is constantly circulated in order to keep the coating conditions constant. Therefore, in order to efficiently circulate and to maintain the coating suitability during spraying, it is necessary to adjust the viscosity of the coating to a low viscosity of 100 to 300 cP.
【０００９】ハイソリッド塗料をさらに低粘度にするた
めには、マトリックスとなる塗膜形成要素自体をさらに
低粘度化するのが望ましい。ところが有機溶剤が減少し
塗膜形成要素の含有量が多くなるにつれて、スプレーガ
ンから吐出された時点と塗着した時点の粘度差が小さく
なり、塗膜形成要素自体を低粘度化すればするほど垂れ
が生じ易いという根本的な問題がある。In order to further reduce the viscosity of the high-solid paint, it is desirable to further reduce the viscosity of the film-forming element itself which becomes the matrix. However, as the amount of organic solvent decreases and the content of the coating film forming element increases, the difference in viscosity between the time of being discharged from the spray gun and the time of coating is smaller, and the lower the viscosity of the coating film forming element itself is. There is a fundamental problem that dripping is likely to occur.
【００１０】また特開平3-262568号公報に開示された方
法を利用しても、ハイソリッド塗料はもともと希釈剤量
が少ないのであるから、飛行中の希釈剤の揮散による粘
度上昇効果はあまり期待できない。さらに特開平3-2625
68号公報に開示された方法では、スプレーされた塗粒は
広がりながら飛行するのであるから、飛行中の塗粒全体
に電磁波を照射しようとすると照射範囲を大きくとる必
要があり、装置が大掛かりとなる。また塗粒の飛行時間
はほとんど一定で短時間であり、電磁波の照射時間を可
変することは困難であるため、照射時間の可変により塗
着時の粘度を可変することも困難である。Even when the method disclosed in Japanese Patent Laid-Open No. 3-262568 is used, since the amount of the diluent in the high-solid paint is originally small, the effect of increasing the viscosity due to the volatilization of the diluent during the flight is expected. Can not. Furthermore, JP-A-3-2625
In the method disclosed in Japanese Patent Publication No. 68, the sprayed coating particles fly while spreading, so it is necessary to set a large irradiation range in order to irradiate the electromagnetic waves to the entire coating particles in flight, which requires a large apparatus. Become. Further, the flight time of the coating particles is almost constant and short, and it is difficult to change the irradiation time of the electromagnetic wave. Therefore, it is also difficult to change the viscosity at the time of coating by changing the irradiation time.
【００１１】本発明は上記実情に鑑みてなされたもので
あり、初期状態に必要な低粘度を維持しつつ、使用する
有機溶剤量及び蒸発する有機溶剤量を極力減らしたハイ
ソリッド塗料を用いて、塗工性に優れ、かつ公害及び省
資源問題の解決に貢献し得る塗装方法を提供することを
目的とする。The present invention has been made in view of the above circumstances, and uses a high-solid coating material in which the amount of organic solvent used and the amount of evaporated organic solvent are reduced as much as possible while maintaining the low viscosity required in the initial state. It is an object of the present invention to provide a coating method which has excellent coatability and can contribute to solving pollution and resource saving problems.
【００１２】[0012]
【課題を解決するための手段】上記課題を解決する本発
明の塗装方法は、電磁波の照射により重合可能な重合成
分を含有する液状塗料組成物をスプレー装置に供給する
管路の途中で塗料組成物に電磁波を照射して重合成分を
重合させ、粘度が上昇した塗料組成物をスプレー装置か
ら吐出して塗装することを特徴とする。The coating method of the present invention for solving the above-mentioned problems is a coating composition in the middle of a pipeline for supplying a liquid coating composition containing a polymerizable component which can be polymerized by irradiation of electromagnetic waves to a spray device. It is characterized in that an object is irradiated with an electromagnetic wave to polymerize a polymerization component, and a coating composition having an increased viscosity is discharged from a spray device for coating.
【００１３】重合成分を含む上記塗料組成物としては、
例えば片末端にメタクリロイル基などの二重結合をもつ
マクロモノマーを用いることができる。またアクリル樹
脂、加熱型架橋剤及び有機溶剤を含み、有機溶剤の一部
が、電磁波による重合性をもつ重合成分により置換され
た塗料組成物を用いることもできる。上記アクリル樹脂
は特に限定されず、アクリル酸ブチル、メタクリル酸メ
チル又はメタクリル酸ブチル等の（メタ）アクリル酸ア
ルキルと、メタクリル酸２−ヒドロキシエチル又はメタ
クリル酸２−ヒドロキシプロピル等の官能基含有単量体
とをラジカル共重合して得られる一般的なアクリル樹脂
を用いることができる。The above coating composition containing a polymerizing component includes
For example, a macromonomer having a double bond such as methacryloyl group at one end can be used. It is also possible to use a coating composition containing an acrylic resin, a heating type cross-linking agent and an organic solvent, in which a part of the organic solvent is replaced by a polymerization component having a polymerizable property by electromagnetic waves. The acrylic resin is not particularly limited, and an alkyl (meth) acrylate such as butyl acrylate, methyl methacrylate or butyl methacrylate, and a functional group-containing unit amount such as 2-hydroxyethyl methacrylate or 2-hydroxypropyl methacrylate. A general acrylic resin obtained by radical copolymerization with the body can be used.
【００１４】上記加熱型架橋剤は特に限定されず、アク
リル樹脂に対応してメラミン、多価イソシアネート等の
一般的な加熱型架橋剤を用いることができる。上記有機
溶剤は特に限定されず、トルエン、キシレン、ブタノー
ル等の一般的な有機溶剤を用いることができる。ただ
し、重合成分による増粘効果により、塗着時の垂れの発
生を効果的に防止することができるので、スプレーガン
から噴射されてから被塗物に塗着するまでの間に蒸発す
るような沸点の低い有機溶剤をあえて用いる必要はな
い。このため、被塗物に塗着した後、塗膜の流動性を確
保して平滑な塗面の形成に貢献し得るような、なるべく
沸点の高い有機溶剤を用いることが好ましい。The heating type cross-linking agent is not particularly limited, and a general heating type cross-linking agent such as melamine or polyisocyanate can be used corresponding to the acrylic resin. The organic solvent is not particularly limited, and a general organic solvent such as toluene, xylene, butanol can be used. However, the thickening effect of the polymerization components can effectively prevent the occurrence of sagging at the time of coating, so that it may evaporate after being sprayed from the spray gun and before being coated on the object to be coated. It is not necessary to dare to use an organic solvent having a low boiling point. For this reason, it is preferable to use an organic solvent having a boiling point as high as possible so as to secure the fluidity of the coating film and contribute to the formation of a smooth coating surface after coating the coating object.
【００１５】なお重合成分の重合により粘度が上昇して
スプレー適性が低下した場合は、スプレー装置によって
塗料組成物に高剪断応力を付与したり、加熱したりして
強制的に低粘度化してスプレー装置から吐出することが
望ましい。When the viscosity increases due to the polymerization of the polymerized components and the sprayability decreases, a high shear stress is applied to the coating composition by a spray device, or the coating composition is heated to forcibly reduce the viscosity and then sprayed. It is desirable to discharge from the device.
【００１６】[0016]
【作用】本発明の塗装方法では、平常時の塗料の粘度は
約１００〜３００ｃＰ（１０〜３０cPa ・ｓ）とするこ
とができ、円滑に循環使用することができる。そしてス
プレーから吐出する前の管路の途中で塗料組成物に電磁
波が照射される。すると組成物中に含まれる重合成分に
重合反応が生じ、塗料組成物の粘度が上昇する。In the coating method of the present invention, the viscosity of the paint in normal times can be set to about 100 to 300 cP (10 to 30 cPa · s) and can be smoothly circulated and used. Then, the coating composition is irradiated with electromagnetic waves in the middle of the conduit before being discharged from the spray. Then, the polymerization component contained in the composition undergoes a polymerization reaction to increase the viscosity of the coating composition.
【００１７】粘度の上昇によりスプレー塗装適性が低下
する場合は、ホットスプレーなどが利用される。つまり
増粘した塗料組成物を加熱することにより、塗料組成物
の粘度は強制的に低下され、スプレー塗工可能な粘度と
なり円滑な微粒化が達成される。そしてスプレーから吐
出された塗粒は、微粒化されているので被塗物に塗着し
たときの塗面の平滑性に優れている。そして塗粒は、主
として大気による冷却により元の管路内と同等の粘度に
まで回復し、被塗物に塗着した時点では粘度は例えば約
１０００ｃＰ（１００cPa ・s ）に回復している。した
がって垂れが防止される。When spray coating suitability decreases due to increase in viscosity, hot spraying or the like is used. That is, by heating the viscosity-increased coating composition, the viscosity of the coating composition is forcibly reduced, and the viscosity becomes spray coatable, and smooth atomization is achieved. Since the coating particles discharged from the spray are atomized, they are excellent in the smoothness of the coating surface when they are applied to the object to be coated. Then, the coating particles are recovered to the same viscosity as in the original pipeline mainly by cooling with the atmosphere, and when they are applied to the object to be coated, the viscosity is recovered to, for example, about 1000 cP (100 cPa · s). Therefore, dripping is prevented.
【００１８】また電磁波は一般に径の小さな管路に照射
されるので、電磁波照射のための設備は小さくてよい。
さらに管路の長さには一般に制限がないので、電磁波を
照射する管路の長さを可変することにより塗料組成物の
増粘度合いを制御することができ、粘度の制御が容易で
ある。さらに、重合反応は一般に酸素の存在により妨害
されるが、管路内の塗料組成物に電磁波を照射して重合
させるのであるから、酸素の妨害を回避することができ
重合反応を効率よく行うことができる。Further, since electromagnetic waves are generally applied to a pipe having a small diameter, the equipment for electromagnetic wave irradiation may be small.
Further, since the length of the pipeline is generally not limited, it is possible to control the viscosity increasing degree of the coating composition by varying the length of the pipeline for irradiating the electromagnetic wave, and it is easy to control the viscosity. Further, the polymerization reaction is generally hindered by the presence of oxygen, but since the coating composition in the pipeline is irradiated with electromagnetic waves to polymerize, the hindrance of oxygen can be avoided and the polymerization reaction can be carried out efficiently. You can
【００１９】そして上記のように構成することにより、
重合成分の重合を完全に行わせることができる。したが
って塗膜中に二重結合が残存するのが防止され、残存す
る二重結合による各種欠陥を回避することができる。By configuring as described above,
The polymerization of the polymerization components can be carried out completely. Therefore, the double bond is prevented from remaining in the coating film, and various defects due to the remaining double bond can be avoided.
【００２０】[0020]
【実施例】以下、実施例により具体的に説明する。 （実施例１）図１に本実施例で使用した塗装装置の構成
説明図を示す。この塗装装置は、塗料タンク１と、ポン
プ１０により塗料を塗料タンク１からスプレーガン２に
供給する供給管路１１と、非塗装時にスプレーガン２の
手前から塗料を塗料タンク１に戻すリターン管路１２と
からなり、供給管路１１のスプレーガン２の手前の一部
分には紫外線ランプ３が設けられている。またスプレー
ガン２には図示しない加熱装置が設けられ、ホットスプ
レー可能となっている。EXAMPLES The present invention will be specifically described below with reference to examples. (Embodiment 1) FIG. 1 is a structural explanatory view of a coating apparatus used in this embodiment. This coating apparatus includes a paint tank 1, a supply pipe 11 for supplying paint from the paint tank 1 to the spray gun 2 by a pump 10, and a return pipe for returning the paint from the front of the spray gun 2 to the paint tank 1 when not painting. The ultraviolet lamp 3 is provided in a part of the supply pipe 11 in front of the spray gun 2. Further, the spray gun 2 is provided with a heating device (not shown) so that hot spraying is possible.
【００２１】供給管路１１の少なくとも紫外線ランプ３
に対向する部分は、透明なガラス管から形成され紫外線
が透過可能となっている。そして紫外線ランプ３は高圧
水銀ランプ（６ｋＷ×２）からなり、供給管路１１から
３００ｍｍ離間して設けられ、供給管路１１に向かって
紫外線が照射可能に構成されている。次に、本実施例で
用いたハイソリッド塗料は、重量平均分子量（Ｍｗ）が
２６００で片末端にメタクリロイル基をもつマクロモノ
マー８０重量％と、キシレン２０重量％とから構成さ
れ、さらに、このハイソリッド塗料１００重量部に対し
て４重量部の光重合開始剤（「ダロキュア１１７３」チ
バガイギー社製）を添加して本実施例で用いる塗料組成
物とした。At least the ultraviolet lamp 3 in the supply line 11.
The portion opposite to is formed of a transparent glass tube and can transmit ultraviolet rays. The ultraviolet lamp 3 is composed of a high-pressure mercury lamp (6 kW × 2), is provided 300 mm away from the supply pipeline 11, and is configured to be able to irradiate ultraviolet rays toward the supply pipeline 11. Next, the high solid coating material used in this example is composed of 80% by weight of a macromonomer having a weight average molecular weight (Mw) of 2600 and having a methacryloyl group at one end, and 20% by weight of xylene. 4 parts by weight of a photopolymerization initiator (“Darocur 1173” manufactured by Ciba Geigy) was added to 100 parts by weight of the solid coating material to prepare a coating composition used in this example.
【００２２】この塗料組成物を塗料タンク１内に入れ、
ポンプ１０の駆動により塗料タンク１→ポンプ１０→供
給管路１１→リターン管路１２→塗料タンク１と循環さ
せる。この時の塗料組成物の温度は２５℃であり粘度は
２００ｃＰ（２０ｃＰａ・ｓ）である。この循環時に
は、紫外線ランプ３は消灯されている。したがって循環
時の塗料組成物の増粘はなく、低粘度であるので円滑に
循環される。This coating composition was placed in the coating tank 1,
By driving the pump 10, the paint tank 1 is circulated in the order of the pump 10, the supply pipe line 11, the return pipe line 12, and the paint tank 1. At this time, the temperature of the coating composition is 25 ° C. and the viscosity is 200 cP (20 cPa · s). The ultraviolet lamp 3 is turned off during this circulation. Therefore, the viscosity of the coating composition does not increase during circulation, and the viscosity is low, so that the coating composition is smoothly circulated.
【００２３】そして被塗物４をスプレーガン２に対向し
て３００ｍｍ離間した位置に配置し、スプレーガン２か
ら塗料組成物を吐出してホットスプレー塗装を行った。
このとき紫外線ランプ３から供給管路１１に紫外線を照
射した。紫外線の照射量は、紫外線の照射幅を変更する
ことにより２２mJ/cm2、４４mJ/cm2及び６６mJ/cm2の３
水準とし、それぞれホットスプレー塗装を行った。塗料
組成物は図示しない加熱装置により加熱されて６０℃と
なり、紫外線照射により増粘するとともに加熱により減
粘されて、粘度は２００ｃＰ（２０ｃＰａ・ｓ）となっ
てスプレーガン２から吐出される。したがって吐出され
た塗粒は、低粘度であるため円滑に微粒化される。Then, the article to be coated 4 was placed at a position facing the spray gun 2 and separated by 300 mm, and the coating composition was discharged from the spray gun 2 to perform hot spray coating.
At this time, the supply line 11 was irradiated with ultraviolet rays from the ultraviolet lamp 3. The dose of ultraviolet rays, 22 mJ / cm 2 by changing the irradiation width of the ultraviolet, 44 mJ / cm 2 and 3 of 66 mJ / cm 2
It was set to the standard and hot spray coating was performed on each. The coating composition is heated to 60 ° C. by a heating device (not shown), thickened by ultraviolet irradiation and reduced by heating, and has a viscosity of 200 cP (20 cPa · s) and is discharged from the spray gun 2. Therefore, the discharged coating particles have a low viscosity and are smoothly atomized.
【００２４】このようにして塗装した場合の、被塗物４
に塗着時の塗料組成物の粘度を測定するとともに、塗装
外観（垂れの程度）を目視で評価し、結果を表１に示
す。なお、比較として紫外線照射を行わなかったこと以
外は同様にして塗装を行い、評価結果を表１に示す。The article to be coated 4 when coated in this way
The viscosity of the coating composition at the time of coating was measured, and the coating appearance (degree of sagging) was visually evaluated, and the results are shown in Table 1. For comparison, coating was performed in the same manner except that the ultraviolet irradiation was not performed, and the evaluation results are shown in Table 1.
【００２５】[0025]
【表１】 表１より、紫外線照射量に比例して塗着後の粘度が上昇
し、それに伴って垂れが防止されていることが明らかで
ある。 （実施例２）アクリル樹脂とメラミン樹脂からなる加熱
架橋型クリヤ塗料（「Ｏ−１５０」（日本ペイント社
製）３８重量部と、ヒドロキシピバリン酸ネオペンチル
グリコールジアクリレート（ＨＰＮＤＡ）９８．５重量
％と実施例１と同様の光重合開始剤１．５重量％とから
なる重合成分３２重量部と、有機溶剤３０重量部とを混
合し、本実施例で用いる塗料組成物とした。[Table 1] From Table 1, it is clear that the viscosity after application increases in proportion to the irradiation amount of ultraviolet rays and the sagging is prevented accordingly. (Example 2) 38 parts by weight of a heat-crosslinking clear coating composition ("O-150" (manufactured by Nippon Paint Co., Ltd.), which is composed of an acrylic resin and a melamine resin, and 98.5% by weight of neopentyl glycol diacrylate hydroxypivalate (HPNDA). Then, 32 parts by weight of a polymerization component consisting of 1.5% by weight of the same photopolymerization initiator as in Example 1 and 30 parts by weight of an organic solvent were mixed to obtain a coating composition used in this example.
【００２６】この塗料組成物を実施例１と同様の塗装装
置に供給し、実施例１と同様にして塗装を行った。紫外
線照射量は６６mJ/cm2である。その結果、循環時の粘度
は２００ｃＰ（２０ｃＰａ・ｓ）であり塗着後の粘度は
１２３０ｃＰ（１２３ｃＰａ・ｓ）であって、垂れの発
生もなく実施例１と同様の結果を示した。なお、上記実
施例では光重合開始剤を添加したが、重合成分の種類や
塗装条件によってはこのような重合開始剤を必要としな
い場合もある。This coating composition was supplied to the same coating apparatus as in Example 1 and was coated in the same manner as in Example 1. The ultraviolet irradiation dose is 66 mJ / cm 2 . As a result, the viscosity during circulation was 200 cP (20 cPa · s) and the viscosity after application was 1230 cP (123 cPa · s), and the same results as in Example 1 were obtained without sagging. Although a photopolymerization initiator was added in the above examples, such a polymerization initiator may not be necessary depending on the type of polymerization components and coating conditions.
【００２７】また電磁波としては、紫外線以外にもマイ
クロ波、電子線、遠赤外線などを利用することができ
る。As the electromagnetic waves, microwaves, electron beams, far infrared rays, etc. can be used in addition to ultraviolet rays.
【００２８】[0028]
【発明の効果】すなわち本発明の塗装方法によれば、ハ
イソリッド塗料の垂れを効果的に防止することができ
る。したがってハイソリッド中の塗膜形成要素の濃度を
高めることができ、一層の資源節約と環境汚染防止を図
ることが可能となる。That is, according to the coating method of the present invention, it is possible to effectively prevent the dripping of the high solid paint. Therefore, it is possible to increase the concentration of the coating film forming element in the high solid, and further save resources and prevent environmental pollution.
【図１】本発明の一実施例で用いた塗装装置の構成説明
図である。FIG. 1 is a structural explanatory view of a coating device used in an embodiment of the present invention.
１：塗料タンク ２：スプレーガン ３：紫外
線ランプ ４：被塗物1: Paint tank 2: Spray gun 3: Ultraviolet lamp 4: Object to be coated
Claims (2)
を含有する液状塗料組成物をスプレー装置に供給する管
路の途中で該塗料組成物に該電磁波を照射して該重合成
分を重合させ、粘度が上昇した該塗料組成物を該スプレ
ー装置から吐出して塗装することを特徴とする塗装方
法。1. The coating composition is polymerized by irradiating the coating composition with the electromagnetic wave in the middle of a pipe for supplying a liquid coating composition containing a polymerizing component capable of being polymerized by irradiation of the electromagnetic wave to a spray device, A coating method, characterized in that the coating composition having an increased viscosity is discharged from the spray device for coating.
物を強制的に低粘度化して吐出する請求項１記載の塗装
方法。2. The coating method according to claim 1, wherein the spray device forcibly reduces the viscosity of the coating composition having an increased viscosity and discharges the coating composition.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6020140A JP3031153B2 (en) | 1994-02-17 | 1994-02-17 | Painting method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6020140A JP3031153B2 (en) | 1994-02-17 | 1994-02-17 | Painting method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07227567A true JPH07227567A (en) | 1995-08-29 |
| JP3031153B2 JP3031153B2 (en) | 2000-04-10 |
Family
ID=12018842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6020140A Expired - Lifetime JP3031153B2 (en) | 1994-02-17 | 1994-02-17 | Painting method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3031153B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013139851A1 (en) | 2012-03-22 | 2013-09-26 | Basf Se | Method and device for producing cured coating layers |
| US9339832B2 (en) | 2012-03-22 | 2016-05-17 | Basf Se | Spraygun for producing cured coating films and methods of use thereof |
-
1994
- 1994-02-17 JP JP6020140A patent/JP3031153B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013139851A1 (en) | 2012-03-22 | 2013-09-26 | Basf Se | Method and device for producing cured coating layers |
| US9339832B2 (en) | 2012-03-22 | 2016-05-17 | Basf Se | Spraygun for producing cured coating films and methods of use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3031153B2 (en) | 2000-04-10 |
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