JP5599981B2 - Painting method - Google Patents
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- JP5599981B2 JP5599981B2 JP2009063158A JP2009063158A JP5599981B2 JP 5599981 B2 JP5599981 B2 JP 5599981B2 JP 2009063158 A JP2009063158 A JP 2009063158A JP 2009063158 A JP2009063158 A JP 2009063158A JP 5599981 B2 JP5599981 B2 JP 5599981B2
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Description
本発明は、塗装方法に関する。詳しくは、被塗装面を塗装する塗装方法に関する。 The present invention relates to a coating method. Specifically, the present invention relates to a painting method for painting a surface to be painted.
従来より、自動二輪車の燃料タンクは以下の手順で塗装される。すなわち、ベース塗装、クリア塗装、オーバーコートクリア塗装の順に行われる。
ここで、オーバーコートクリア塗装は、図５に示すように、ＵＶ塗料塗布工程、塗膜フロー工程、溶剤乾燥工程、ＵＶ硬化工程、熱硬化工程の順に行われる（特許文献１参照）。
ＵＶ塗料塗布工程は、ＵＶ塗料をワークの被塗装面に塗布する工程である。
塗膜フロー工程は、塗膜表面をフローさせる工程である。
溶剤乾燥工程は、溶剤を乾燥させる工程である。
ＵＶ硬化工程は、紫外線（ＵＶ）を塗料に照射して、ＵＶ塗料を硬化させる工程である。
熱硬化工程は、塗料に赤外線を照射して加熱し、ＵＶ塗料の硬化を促進する工程である。
Conventionally, motorcycle fuel tanks are painted according to the following procedure. That is, the base coating, clear coating, and overcoat clear coating are performed in this order.
Here, as shown in FIG. 5, the overcoat clear coating is performed in the order of a UV paint application process, a coating film flow process, a solvent drying process, a UV curing process, and a thermosetting process (see Patent Document 1).
The UV coating application process is a process of applying the UV coating to the surface to be coated of the workpiece.
A coating-film flow process is a process of making the coating-film surface flow.
The solvent drying step is a step of drying the solvent.
The UV curing step is a step of curing the UV paint by irradiating the paint with ultraviolet rays (UV).
The thermosetting process is a process of accelerating curing of the UV paint by irradiating the paint with infrared rays and heating the paint.
しかしながら、ＵＶ塗料塗布工程の後、直ちにＵＶ硬化工程を行うと、塗膜が強く収縮し、塗膜表面に微細な縮みが生じるチリ肌となりやすい、という問題があった。 However, when the UV curing process is performed immediately after the UV paint application process, there is a problem that the coated film is strongly contracted, and the skin becomes liable to cause fine shrinkage on the coating film surface.
本発明は、塗膜表面に微細な縮みが生じるのを防止できる塗装方法を提供することを目的とする。 An object of this invention is to provide the coating method which can prevent that a fine shrinkage arises on the coating-film surface.
本発明の塗装方法は、光および熱に反応する化合物（例えば、後述のオリゴマー１０）と、光に反応する化合物（例えば、後述のモノマー２０）と、を含むＵＶ塗料を、被塗装面に塗布するＵＶ塗料塗布工程と、当該ＵＶ塗料塗布工程の後に、少なくとも塗膜を加熱して、熱反応部を一部重合させる加熱工程と、当該加熱工程の後に、少なくとも塗膜に紫外線を照射して、光反応部を重合させるＵＶ照射工程と、当該ＵＶ照射工程の後に、少なくとも塗膜を加熱して、熱反応部の重合度を促進する加熱工程と、を備えることを特徴とする。 In the coating method of the present invention, a UV paint containing a compound that reacts with light and heat (for example, an oligomer 10 described later) and a compound that reacts with light (for example, a monomer 20 described later) is applied to a surface to be coated. A UV coating application process, a heating process for heating at least the coating film after the UV coating coating process, and partially polymerizing the thermal reaction part, and at least an ultraviolet ray is applied to the coating film after the heating process. And a UV irradiation step for polymerizing the photoreactive portion, and a heating step for heating the coating film at least after the UV irradiation step to promote the degree of polymerization of the thermal reaction portion.
ここで、ＵＶ塗料とは、熱硬化およびＵＶ硬化の両方によって硬化する塗料である。例えば、オリゴマー、モノマー、光重合開始剤、およびその他の添加剤からなる主剤と、イスシアネートと、からなる塗料が挙げられる。
また、光反応とは、ＵＶ照射によって、光重合開始剤からラジカルが形成され、このラジカルがモノマー、オリゴマー中の二重結合を攻撃して、この二重結合を開環させ重合させる反応である。
Here, the UV coating is a coating that is cured by both heat curing and UV curing. For example, the coating material which consists of a main ingredient which consists of an oligomer, a monomer, a photoinitiator, and another additive, and an isocyanate is mentioned.
The photoreaction is a reaction in which a radical is formed from a photopolymerization initiator by UV irradiation, and this radical attacks a double bond in a monomer or oligomer to open the double bond and polymerize it. .
この発明によれば、まず、加熱工程を実行して、熱反応部間に一部橋架け反応を生じさせる。次に、ＵＶ照射工程を実行して、光反応部間の橋架け反応を促進する。次に、加熱工程を実行して、熱反応部間の橋架け反応をさらに促進する。
このように、ＵＶ照射工程の前に一旦加熱工程を実行して、熱反応部間に一部橋架け反応を生じさせたので、従来のようにＵＶ塗料塗布工程の後に直ちにＵＶ硬化工程を行う場合に比べて、塗膜の収縮が緩和されるから、塗膜表面の微細な縮みが生じるのを防止でき、外観を向上させることが可能である。
According to the present invention, first, a heating step is performed to cause a partial bridging reaction between the thermal reaction portions. Next, a UV irradiation process is performed to promote a bridging reaction between the photoreactive parts. Next, a heating process is performed to further accelerate the bridging reaction between the thermal reaction parts.
As described above, since the heating process is once executed before the UV irradiation process, and a partial cross-linking reaction is caused between the heat reaction parts, the UV curing process is performed immediately after the UV paint application process as in the past. Compared with the case, since the shrinkage of the coating film is alleviated, it is possible to prevent fine shrinkage of the coating film surface and to improve the appearance.
本発明によれば、ＵＶ照射工程の前に一旦加熱工程を実行して、熱反応部間に一部橋架け反応を生じさせたので、重合したポリマーの弾性によって、塗膜の収縮が緩和されるから、塗膜表面の微細な縮みが生じるのを防止でき、外観を向上させることが可能である。 According to the present invention, the heating process is once performed before the UV irradiation process, and a partial bridging reaction is caused between the thermal reaction parts. Therefore, the shrinkage of the coating film is alleviated by the elasticity of the polymerized polymer. Therefore, it is possible to prevent fine shrinkage of the coating film surface and to improve the appearance.
以下、本発明の一実施形態を図面に基づいて説明する。
図１は、本発明の一実施形態に係る塗装方法により形成された塗膜１を示す断面図である。
この塗膜１は、ワークとしての自動二輪車の燃料タンク２の表面に形成される。すなわち、まず、ベース塗装、クリア塗装の順に行って、ベース塗装塗膜３、クリア塗装塗膜４を形成する。次に、クリア塗装塗膜４上にシール５を貼り付けて、その後、オーバーコートクリア塗装を行い、オーバーコートクリア塗装塗膜６を形成する。
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view showing a coating film 1 formed by a coating method according to an embodiment of the present invention.
This coating film 1 is formed on the surface of a
このうち、オーバーコートクリア塗装は、図２に示すように、ＵＶ塗料塗布工程、塗膜フロー工程、加熱工程としての溶剤乾燥および一部熱硬化工程、ＵＶ照射工程としてのＵＶ硬化工程、加熱工程としての熱硬化工程の順に行われる。 Among these, as shown in FIG. 2, the overcoat clear coating is a UV coating application process, a coating film flow process, a solvent drying and heating process as a heating process, a UV curing process as a UV irradiation process, and a heating process. As a heat curing step.
ＵＶ塗料塗布工程とは、光および熱によって反応するオリゴマー１０と、光によって反応するモノマー２０とを含むＵＶ塗料を、被塗装面に塗布する工程である。
このＵＶ塗料塗布工程を実行すると、図３（ａ）に示すように、塗膜中には、オリゴマー１０とモノマー２０とが混在している。
The UV coating application step is a step of applying a UV coating containing an oligomer 10 that reacts with light and heat and a monomer 20 that reacts with light onto a surface to be coated.
When this UV coating application process is executed, as shown in FIG. 3A, the oligomer 10 and the monomer 20 are mixed in the coating film.
塗膜フロー工程とは、塗膜表面をフローさせる工程である。
溶剤乾燥および一部熱硬化工程とは、塗料に赤外線を照射して塗膜を加熱し、溶剤を乾燥させつつ、ポリマーおよび未反応だったオリゴマーを重合させる工程である。
この溶剤乾燥および一部熱硬化工程を実行すると、モノマー２０は重合しないが、オリゴマー１０が重合する。よって、図３（ｂ）に示すように、塗膜中では、ポリマーの重合度が異なり、ポリマー１１Ａやポリマー１１Ｂが混在した状態となる。よって、この状態では、モノマー２０は重合しておらず、塗膜中を移動可能となっているが、塗膜がある程度硬化することとなる。
The coating film flow process is a process of causing the coating film surface to flow.
The solvent drying and partially thermosetting step is a step of polymerizing the polymer and the unreacted oligomer while drying the solvent by irradiating the paint with infrared rays to heat the coating film.
When this solvent drying and partial thermosetting steps are performed, the monomer 20 is not polymerized, but the oligomer 10 is polymerized. Therefore, as shown in FIG. 3B, the degree of polymerization of the polymers is different in the coating film, and the polymer 11A and the polymer 11B are mixed. Therefore, in this state, the monomer 20 is not polymerized and can move in the coating film, but the coating film is cured to some extent.
ＵＶ硬化工程とは、紫外線を塗料に照射して、塗膜中のモノマーとポリマーとを重合させる工程である。
ＵＶ硬化工程を実行すると、塗膜中では、ポリマー１１Ａ、１１Ｂに加えてモノマー２０も重合した状態となるので、図３（ｃ）に示すように、モノマー２０が重合されたポリマー１１Ｃが生成され、塗膜がさらに硬化することとなる。
なお、ＵＶ照射量は塗膜が深くなるに従って減少するため、この状態では、塗膜の深い部分では、モノマー２０はそれほど重合していない。
The UV curing step is a step of polymerizing monomers and polymers in the coating film by irradiating the paint with ultraviolet rays.
When the UV curing step is executed, the monomer 20 is polymerized in addition to the polymers 11A and 11B in the coating film, so that a polymer 11C in which the monomer 20 is polymerized is generated as shown in FIG. The coating film is further cured.
Since the UV irradiation amount decreases as the coating film becomes deeper, in this state, the monomer 20 is not polymerized so much in the deep part of the coating film.
次に、熱硬化工程を実行すると、塗膜中では、ポリマー１１Ｃの重合度が進むため、塗膜の深い部分についても、完全に硬化することとなる。 Next, when the thermosetting step is executed, the polymerization degree of the polymer 11C advances in the coating film, and thus a deep portion of the coating film is completely cured.
図４は、本発明の塗装方法のタイミングチャートである。図４中、破線は、従来の塗装方法であり、実線は、本発明の塗装方法を示す。
時刻ｔ０からｔ１の期間、塗膜表面をフローさせて、平滑性を高める。具体的には、ＬＷ値を向上させる。
FIG. 4 is a timing chart of the coating method of the present invention. In FIG. 4, the broken line indicates a conventional coating method, and the solid line indicates the coating method of the present invention.
During the period from time t0 to t1, the surface of the coating film is flowed to improve smoothness. Specifically, the LW value is improved.
ここで、ＬＷ（Ｌｏｎｇ Ｗａｖｅ）とは、Ｗａｖｅｓｃａｎ（ＢＹＫ Ｇａｒｄｎｅｒ社製）と呼ばれる測定器で測定された、塗膜の平滑度を表す指標である。具体的には、この測定器からレーザ光を塗膜表面に照射して、塗膜表面の反射光強度を検出し、塗膜表面の光学プロファイルを検出する。そして、この光学ファイルを数学的フィルターにかけ、塗膜表面のストラクチャーを波長毎に分離し、測定した波長がある程度長いものを抽出して数値化したものである。したがって、ＬＷ値は、表面のなだらかな凹凸を表したものである。このＬＷ値が低いほど表面が平滑であるといえる。 Here, LW (Long Wave) is an index representing the smoothness of the coating film measured by a measuring instrument called Wavescan (manufactured by BYK Gardner). Specifically, the surface of the coating film is irradiated with laser light from this measuring device, the reflected light intensity on the coating film surface is detected, and the optical profile on the coating film surface is detected. Then, the optical file is subjected to a mathematical filter, the structure of the coating film surface is separated for each wavelength, and the measured wavelength is extracted to a certain extent and digitized. Therefore, the LW value represents the gentle unevenness of the surface. It can be said that the lower the LW value, the smoother the surface.
時刻ｔ１からｔ２の期間、溶剤乾燥および一部熱硬化工程を実行して、ＳＷ値を向上させつつ、塗膜をある程度硬化させる。
ここで、ＳＷ（Ｓｈｏｒｔ Ｗａｖｅ）とは、上述の光学ファイルを数学的フィルターにかけ、塗膜表面のストラクチャーを波長毎に分離し、測定した波長がある程度短いものを抽出して数値化したものである。したがって、ＳＷ値は、表面の細かい凹凸を表したものである。このＳＷ値が低いほど表面が平滑であるといえる。
During the period from the time t1 to the time t2, the solvent drying and partial thermosetting steps are executed to improve the SW value and cure the coating film to some extent.
Here, SW (Short Wave) is obtained by applying the above-mentioned optical file to a mathematical filter, separating the structure of the coating film surface for each wavelength, and extracting and quantifying the measured wavelength that is somewhat short. . Therefore, the SW value represents fine irregularities on the surface. It can be said that the lower the SW value, the smoother the surface.
時刻ｔ２からｔ３の期間、ＵＶ硬化工程を実行して、塗膜をさらに硬化させる。
時刻ｔ３からｔ４の期間、熱硬化工程を実行して、塗膜を完全に硬化させる。
During the period from time t2 to t3, the UV curing step is executed to further cure the coating film.
During the period from time t3 to t4, a thermosetting process is performed to completely cure the coating film.
本実施形態によれば、以下のような効果がある。
（１）まず、溶剤乾燥および一部熱硬化工程を実行して、オリゴマー１０間に橋架け反応を生じさせて、ポリマー１１Ａ、１１Ｃを生成する。次に、ＵＶ硬化工程を実行して、ポリマー１１Ａ、１１Ｂおよびモノマー２０間の橋架け反応を促進して、ポリマー１１Ｃを生成する。次に、熱硬化工程を実行して、ポリマーＣ間の橋架け反応をさらに促進する。
このように、ＵＶ硬化工程の前に一旦熱硬化工程を実行して、オリゴマー１０のみを橋架け反応させたので、従来のようにＵＶ塗料塗布工程の後に直ちにＵＶ硬化工程を行う場合に比べて、塗膜の収縮が緩和されるから、塗膜表面の微細な縮みが生じるのを防止でき、外観を向上させることが可能である。
According to this embodiment, there are the following effects.
(1) First, a solvent drying and a partial thermosetting process are performed to cause a bridging reaction between the oligomers 10 to generate polymers 11A and 11C. Next, a UV curing step is performed to promote the crosslinking reaction between the polymers 11A, 11B and the monomer 20 to produce the polymer 11C. Next, a thermosetting process is performed to further accelerate the crosslinking reaction between the polymers C.
As described above, since the thermal curing process is executed once before the UV curing process and only the oligomer 10 is crosslinked and reacted, compared with the conventional case where the UV curing process is performed immediately after the UV coating application process. Since the shrinkage of the coating film is alleviated, it is possible to prevent fine shrinkage of the coating film surface and to improve the appearance.
なお、本発明は前記実施形態に限定されるものではなく、本発明の目的を達成できる範囲での変形、改良等は本発明に含まれるものである。 It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
１０ オリゴマー
１１Ａ、１１Ｂ、１１Ｃ ポリマー
２０ モノマー
10 Oligomer 11A, 11B, 11C Polymer 20 Monomer
Claims (1)
当該ＵＶ塗料塗布工程の後に、少なくとも塗膜表面を加熱して、前記オリゴマーの熱反応部を一部重合させる加熱工程と、
当該加熱工程の後に、少なくとも塗膜に紫外線を照射して、前記オリゴマー由来の光反応部および前記モノマーの光反応部を重合させるＵＶ照射工程と、
当該ＵＶ照射工程の後に、少なくとも塗膜深部を加熱して、前記オリゴマーの熱反応部の重合度を促進する加熱工程と、を備えることを特徴とする塗装方法。 And oligomers that polymerize and more reactive to ultraviolet radiation and pressure heat, a monomer to be polymerized and more reactive to ultraviolet radiation without polymerization by heating, the UV paint containing a UV paint coating step of coating the surface to be coated ,
After the UV coating application step, at least the coating film surface is heated, and a heating step for partially polymerizing the thermal reaction part of the oligomer ,
After the heating step, at least the coating film is irradiated with ultraviolet rays, and the UV irradiation step of polymerizing the photoreactive part derived from the oligomer and the photoreactive part of the monomer ,
And a heating step of heating at least the deep part of the coating film to promote the degree of polymerization of the thermal reaction part of the oligomer after the UV irradiation step.
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| JP2009063158A JP5599981B2 (en) | 2009-03-16 | 2009-03-16 | Painting method |
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| JP2009063158A JP5599981B2 (en) | 2009-03-16 | 2009-03-16 | Painting method |
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| JP2010214287A JP2010214287A (en) | 2010-09-30 |
| JP5599981B2 true JP5599981B2 (en) | 2014-10-01 |
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| JPH0689293B2 (en) * | 1986-05-27 | 1994-11-09 | 日本油脂株式会社 | UV curable paint |
| JP2504061B2 (en) * | 1987-07-02 | 1996-06-05 | 日本油脂株式会社 | Ultraviolet curable paint and its curing method |
| JP3974434B2 (en) * | 2002-03-22 | 2007-09-12 | Ｂａｓｆコーティングスジャパン株式会社 | UV-curable coating composition and coated article |
| JP2004290722A (en) * | 2003-03-25 | 2004-10-21 | Nippon Paint Co Ltd | Method for obtaining a coating film with high surface smoothness |
| EP1669426B1 (en) * | 2003-09-30 | 2008-06-18 | Kansai Paint Co., Ltd. | Coating composition and method of forming coating film |
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