JP2006212478A - Method for forming luster composite coating film and coated material - Google Patents

Method for forming luster composite coating film and coated material Download PDF

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JP2006212478A
JP2006212478A JP2005025209A JP2005025209A JP2006212478A JP 2006212478 A JP2006212478 A JP 2006212478A JP 2005025209 A JP2005025209 A JP 2005025209A JP 2005025209 A JP2005025209 A JP 2005025209A JP 2006212478 A JP2006212478 A JP 2006212478A
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coating film
forming
glittering
base
paint
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Koji Mogi
孝司 茂木
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Nippon Paint Co Ltd
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Nippon Paint Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide an excellent method for forming a luster composite coating film, which is used in a car production line for forming the luster composite coating film to be polished without causing a stain. <P>SOLUTION: The method for forming the luster composite coating film comprises the steps of: forming an electrodeposition coating film on a base material to be coated; forming an intermediate coating film on the electrodeposition coating film; and forming a luster base coating film and a final clear coating film on the formed intermediate coating film by a wet-on-wet method. A step of repairing an abnormal part of the intermediate coating film by using a repairing luster base coating material containing a luster pigment in which a coarse particle is restrained from being mixed and which has a specific particle size distribution and specific average particle size is carried out before the luster base coating film is formed by applying a luster base coating material. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、被塗基材、例えば、自動車ボディー外板における中塗り塗膜の補修工程を含む光輝性複合塗膜形成方法および塗装物に関するものである。特に、自動車生産ラインでの中塗り塗膜の補修工程を含む光輝性複合塗膜形成方法および塗装物に関する。   The present invention relates to a method for forming a glittering composite coating film and a coated product including a step of repairing an intermediate coating film on a substrate to be coated, for example, an automobile body outer plate. In particular, the present invention relates to a method for forming a glittering composite coating film including a repair process for an intermediate coating film in an automobile production line, and a coated product.

自動車生産ラインにおける光輝性複合塗膜の形成は、電着塗膜、中塗り塗膜を形成し焼き付け乾燥後、光輝性ベース塗膜、上塗りクリヤー塗膜をウェット・オン・ウェット方式で塗膜形成される。前記ウェット・オン・ウェット方式とは未加熱乾燥状態の塗膜上に次工程で使用する塗料を塗布して未加熱乾燥状態の複合塗膜を形成する塗膜形成方法を意味する。この自動車生産ラインにおいて、中塗り塗膜に付着した塵埃を除去する必要が生じたり、タレ、ピンホール、くぼみ等の塗装欠陥が生じた場合には、その部分の塗膜の補修作業が必要となる。   In the automotive production line, the glitter composite coating film is formed by forming an electrodeposition coating film and intermediate coating film, baking and drying, and then coating the glittering base coating film and the top clear film with a wet-on-wet system. Is done. The wet-on-wet system means a coating film forming method in which a coating film used in the next step is applied on an unheated and dried coating film to form an unheated and dried composite coating film. In this automobile production line, if it is necessary to remove the dust adhering to the intermediate coating film, or if there are coating defects such as sagging, pinholes, dents, etc., it is necessary to repair the coating film in that part. Become.

従来、光輝性複合塗膜形成における中塗り塗膜に関する塗膜補修方法としては、中塗り塗膜の異常部位および上記異常部位の周囲部位を研磨し;次いで上記研磨部位およびその周辺部位を、次工程で使用する光輝性ベース塗料を用いて焼き付けずに補修用塗膜を形成し;次いで該補修用塗膜上および非補修部分の中塗り塗膜上に光輝性ベース塗膜および上塗りクリヤー塗膜を形成し、これら未加熱乾燥状態にある補修用塗膜、光輝性ベース塗膜および上塗りクリヤー塗膜を同時に焼き付け乾燥を行っている。   Conventionally, as a coating film repair method for an intermediate coating film in the formation of a glittering composite coating film, an abnormal part of the intermediate coating film and a peripheral part of the abnormal part are polished; A repair coating film is formed without baking using the glitter base coating used in the process; then the glitter base coating and the clear clear coating on the repair coating and the intermediate coating on the non-repaired portion. The repair coating, the glitter base coating, and the top clear coating in an unheated and dried state are simultaneously baked and dried.

しかしながら、上記光輝性複合塗膜形成においては、上記研磨部位と非研磨部位の塗膜において、上記研磨部位に生じた研ぎ傷部分に上記光輝性ベース塗料中に含まれる、主に粗大粒径の光輝性顔料が、不規則に沈降・配向することに起因する配向ムラが生じる結果、上記研磨部位と非研磨部位の仕上がり外観に差が生じる。すなわち、上記研磨部位の塗膜の仕上がり外観が研ぎ染みとして低下するという欠点があり、特に、淡彩メタリック塗色系において大きな問題となっていた。   However, in the formation of the glitter composite coating film, in the coating film of the polished part and the non-polished part, the abrasive base paint contains mainly a coarse particle size contained in the polished part in the polished part. As a result of uneven alignment due to the glittering pigment being settled and oriented irregularly, a difference occurs in the finished appearance of the polished part and the non-polished part. That is, there is a drawback that the finished appearance of the coating film at the above-mentioned polishing site is reduced as a sharp stain, and this has been a serious problem particularly in light metallic coating systems.

上記問題を解決しようとするものとして、次工程で使用する光輝性ベース塗料から顔料の全部または光輝性顔料を除いた塗料を用いて、焼き付け乾燥せずに補修用塗膜を形成し;次に、補修用塗膜上および非補修部分の中塗り塗膜上に、光輝性ベース塗膜等を形成するという塗膜補修方法が提案されている(特許文献1参照)。
しかしながら、この技術によると、光輝性ベース塗料から顔料が除去されることで、補修部分の塗膜において、耐チッピング性や耐擦り傷性等の塗膜機械強度および隠蔽性が低下する懸念が生じる。
In order to solve the above problems, a repair coating film is formed without baking and drying using a paint obtained by removing all or all of the pigment from the glitter base paint used in the next step; A coating film repairing method has been proposed in which a glittering base coating film or the like is formed on a repair coating film and an intermediate coating film on a non-repaired portion (see Patent Document 1).
However, according to this technique, the pigment is removed from the glittering base paint, so that there is a concern that the mechanical strength of the coating film such as chipping resistance and scratch resistance and the concealing property are deteriorated in the coating film of the repaired portion.

また、アクリル樹脂、ポリエステル樹脂、メラミン樹脂、架橋性重合微粒子、および顔料を含む隠蔽性の良好な中塗り塗膜補修用プライマーが提案されている(特許文献2参照)が、このプライマーは中塗り塗膜に近いもので、光輝性複合塗膜形成において、塗膜の光輝性を強めるようなものではない。   In addition, a primer for repairing an intermediate coating film with good concealment including an acrylic resin, a polyester resin, a melamine resin, a crosslinkable polymer fine particle, and a pigment has been proposed (see Patent Document 2). It is close to the coating film, and does not enhance the glitter of the coating film in the formation of the glittering composite coating film.

特開2002−239454号公報JP 2002-239454 A 特開2002−161229号公報JP 2002-161229 A

自動車生産ラインにおける光輝性複合塗膜形成において、別途、特殊な補修用塗料組成物を用いることなく、中塗り塗膜研磨部位の補修を行うことで、優れた光輝性複合塗膜形成方法を提供することである。   Providing an excellent method of forming a glittering composite coating film by repairing the polished area of the intermediate coating film without using a special repair coating composition separately in forming a glittering composite coating film in an automobile production line It is to be.

本発明者らは上記課題に鑑み鋭意研究した結果、粗大粒子の混入が抑制された、特定の粒度分布および平均粒径の光輝性顔料を含有する塗料を調製し、この塗料(補修用光輝性ベース塗料)を用いて中塗り塗膜研磨部位の補修を行うことで、研ぎ染みがなくなることは勿論、仕上がり外観のきわめて優れた光輝性複合塗膜を形成できることを知見した。   As a result of intensive studies in view of the above problems, the present inventors have prepared a paint containing a bright pigment having a specific particle size distribution and an average particle diameter, in which the incorporation of coarse particles is suppressed, and this paint (recovery glitter) It has been found that by repairing the intermediate coating film polishing site using a base coating material, it is possible to form a glittering composite coating film with an extremely excellent finished appearance as well as eliminating sharpening stains.

すなわち本発明は、
1. 被塗基材に電着塗膜、中塗り塗膜を形成後、光輝性ベース塗膜、上塗りクリヤー塗膜をウェット・オン・ウェット方式で塗膜形成する塗装方法であって、光輝性ベース塗料の塗布前に前記中塗り塗膜の異常部位を補修する工程を含み、以下の工程を順次行うことにより光輝性複合塗膜を形成することを特徴とする光輝性複合塗膜形成方法;
(1)前記中塗り塗膜の異常部位およびその周辺部位を研磨する工程、(2)前記研磨部位を含む中塗り塗膜全面に、粒度分布測定装置を用いて測定したd10が5〜7μm、d50が10〜13μm、およびd90が19〜22μmである光輝性顔料を塗料固形分中7.5〜10質量%含む補修用光輝性ベース塗料を用いて、未加熱乾燥状態の補修用光輝性ベース塗膜を形成する工程、(3)未加熱乾燥状態の前記補修用光輝性ベース塗膜上に、未加熱乾燥状態の前記光輝性ベース塗膜および前記上塗りクリヤー塗膜を形成する工程、(4)未加熱乾燥状態の前記補修用光輝性ベース塗膜、光輝性ベース塗膜および上塗りクリヤー塗膜を同時に焼き付け乾燥する工程;
2. 前記補修用光輝性ベース塗料における光輝性顔料がアルミニウムフレーク顔料および/または着色アルミニウムフレーク顔料である上記1記載の光輝性複合塗膜形成方法;
3. 上記1または2のいずれかに記載の光輝性複合塗膜形成方法によって得られる塗装物;
を提供するものである。
That is, the present invention
1. A coating method in which a glossy base coating film and a top clear coating film are formed by wet-on-wet method after forming an electrodeposition coating film and an intermediate coating film on a substrate to be coated. A method for forming a glittering composite coating film comprising the step of repairing an abnormal portion of the intermediate coating film before application of a base coating, and forming the glittering composite coating film by sequentially performing the following steps;
(1) The step of polishing the abnormal part of the intermediate coating film and the peripheral part thereof, (2) The entire surface of the intermediate coating film including the polishing part has a d10 of 5 to 7 μm measured using a particle size distribution measuring device. A repair glitter base for repairing in an unheated dry state using a glitter base paint for repair containing a glitter pigment having d50 of 10 to 13 μm and d90 of 19 to 22 μm in the solid content of the paint. A step of forming a coating film, (3) a step of forming the glittering base coating film in an unheated dry state and the clear clear coating film on the repairable glittering base coating film in an unheated and dried state, (4) ) A step of baking and drying the repair-use glittering base coating, the glittering base coating and the overcoat clear coating in an unheated and dried state simultaneously;
2. The method for forming a glittering composite coating film according to the above 1, wherein the glittering pigment in the repairable glittering base paint is an aluminum flake pigment and / or a colored aluminum flake pigment;
3. A coated product obtained by the method for forming a glittering composite coating film according to either 1 or 2 above;
Is to provide.

本発明の光輝性複合塗膜形成方法では、粗大粒子の混入が抑制された、特定の粒度分布および平均粒径の光輝性顔料を含有する塗料を調製し、この塗料を用いて中塗り塗膜研磨部位の補修を行う。
従来の光輝性塗料で用いられる光輝性顔料は、レーザー回折式等の粒度分布測定装置を用いて測定した、平均粒径(d50)を基準に選択されていたため、d10およびd90に着目した粒度分布への考慮はなされていなかった。本発明におけるd10、d50およびd90とは、上記測定装置を用いて測定された、それぞれ累積重量が10%となる粒径、累積重量が50%となる粒径および累積重量が90%となる粒径を表し、特に、d50を平均粒径と定義する。アルミニウムフレーク顔料等の光輝性顔料の粒度分布は、その製法上ブロードとなる傾向が強いため、その平均粒径(d50)が10μm前後と本発明で用いられる光輝性顔料と大差がなくとも、従来の発明で用いられる光輝性顔料中には、3〜4μm以下の小粒径を有するものから30μmを超える大粒径のものまでが幅広く含まれているのが通常である。
本発明の補修用光輝性ベース塗料には、特に、平均粒径から大きく外れた粗大粒径の光輝性顔料の混入を抑制した光輝性顔料を用いたため、従来の光輝性ベース塗料を中塗り塗膜研磨部位に直接塗装したときの研ぎ染みの原因であった、研磨部位の研ぎ傷部分における、光輝性顔料の粒度分布がブロードであることによって生じる、特に、大粒径の光輝性顔料が研ぎ傷部分で不規則配列することによる配向ムラが、大幅に解消される。よって、研ぎ染みの問題が解決できるのみならず、光輝性ベース塗膜の下層に、粗大粒子の混入が抑制された、特定の粒度分布および平均粒径の光輝性顔料を含む補修用光輝性ベース塗膜が存在することで、光輝性ベース塗料に配合できる光輝性顔料の選択の幅が拡大し、すなわち、30μmを超える粗大粒子が多量に混入しても研ぎ染みを生じないため、粒子感の強い、より光輝性が高い、仕上がり外観のきわめて優れた光輝性複合塗膜を容易に形成できる。
In the method for forming a glittering composite coating film of the present invention, a coating material containing a glittering pigment having a specific particle size distribution and an average particle diameter, in which coarse particles are prevented from being mixed, is prepared using this coating material. Repair the polished part.
The glitter pigment used in the conventional glitter paint is selected on the basis of the average particle diameter (d50) measured using a particle size distribution measuring apparatus such as a laser diffraction type, so the particle size distribution focusing on d10 and d90. No consideration was given to. In the present invention, d10, d50, and d90 are the particle diameters measured using the above measuring apparatus, the cumulative weight is 10%, the cumulative weight is 50%, the cumulative weight is 90%, and the cumulative weight is 90%. In particular, d50 is defined as the average particle diameter. Since the particle size distribution of glitter pigments such as aluminum flake pigments has a strong tendency to become broad due to its production method, the average particle diameter (d50) is about 10 μm, which is not much different from the glitter pigment used in the present invention. The bright pigments used in the invention usually contain a wide range of pigments having a small particle size of 3 to 4 μm or less to a large particle size exceeding 30 μm.
Since the glittering base paint for repair of the present invention uses a glittering pigment that suppresses the incorporation of a glittering pigment having a coarse particle diameter greatly deviating from the average particle diameter, the conventional glittering base paint is applied to the intermediate coating. This is caused by the fact that the particle size distribution of the bright pigment in the polished part of the polished part, which was the cause of the sharp stain when applied directly to the film polished part, is especially sharpened by the bright pigment of large particle diameter. The alignment unevenness due to the irregular arrangement at the scratched portion is largely eliminated. Therefore, not only the problem of sharpening stains can be solved, but also a glittering base for repair containing a glittering pigment with a specific particle size distribution and average particle size, in which coarse particles are prevented from being mixed under the glittering base coating film. The presence of the coating expands the range of selection of glitter pigments that can be incorporated into the glitter base paint. That is, even if a large amount of coarse particles exceeding 30 μm are mixed, there is no sharpening stain. It is possible to easily form a strong composite film having a high brightness and a very excellent finished appearance.

本発明に係る光輝性複合塗膜形成方法において、被塗基材の表面に、まず、防食性付与のための電着塗膜を形成する。電着塗料としては、通常のカチオン型電着塗料、アニオン型電着塗料のいずれも使用することができるが、防食性の点でカチオン型電着塗料が好ましく、カチオン型電着塗料としては、エポキシ系の樹脂塗料が好ましい。
上記被塗基材には、自動車ボディー外板に適用可能な鋼板であればよく、通常、電着塗装前に上記鋼板に対し脱脂、水洗、化成皮膜形成、水洗、純水洗、乾燥までの前処理を従来公知の方法で行う。電着塗膜形成方法は、従来公知の方法の中から適当な方法を任意に選択すればよく、電着塗装条件、焼き付け乾燥条件、電着塗膜の厚さ等に関しても、被塗基材や電着塗料の種類等に応じて適宜決定される。
In the glittering composite coating film forming method according to the present invention, an electrodeposition coating film for imparting corrosion resistance is first formed on the surface of a substrate to be coated. As the electrodeposition paint, either a normal cation type electrodeposition paint or an anion type electrodeposition paint can be used, but a cationic type electrodeposition paint is preferable in terms of anticorrosion, and as a cation type electrodeposition paint, Epoxy resin paints are preferred.
The coated substrate may be a steel plate that can be applied to the outer plate of an automobile body. Usually, before electrodeposition coating, the steel plate is subjected to degreasing, water washing, chemical film formation, water washing, pure water washing, and drying. The treatment is performed by a conventionally known method. The electrodeposition coating film forming method may be arbitrarily selected from the conventionally known methods. The electrodeposition coating conditions, the baking and drying conditions, the thickness of the electrodeposition coating film, etc. It is determined appropriately according to the type of electrodeposition paint and the like.

次に、上記電着塗膜上に中塗り塗料を塗布して焼き付け乾燥し、中塗り塗膜を形成する。中塗り塗膜には、最終複合塗膜を平滑にし、外観の良好な塗膜とするための下地として機能し、電着塗膜と上塗り塗膜とのバインダーとなり、かつ、複合塗膜を通じて到達する紫外線や水による塗膜の劣化に対する耐候性が要求される。中塗り塗料としては、特に制限されるものでなく、溶剤型塗料のほか、水性塗料、粉体塗料またはハイソリッド型塗料等も適用でき、具体的には、エポキシエステル/メラミン系樹脂、アミノアルキッド/メラミン系樹脂またはオイルフリーポリエステル/メラミン系樹脂塗料等、従来公知の中塗り塗料の中から適宜選択して用いることができる。
また、上記中塗り塗料に含有される顔料は、着色顔料および体質顔料が好ましい。このうち、着色顔料としては、二酸化チタン、カーボンブラック、グラファイト、酸化鉄等の無機顔料;フタロシアニンブルー、フタロシアニングリーン、キナクリドン、インダンスロン、イソインドリノン、ペリレン、アンスラピリミジン等の有機顔料が使用され、体質顔料としては、硫酸バリウム、アルミニウムシリケート等を用いることができる。
中塗り塗膜形成方法に関しては、従来公知の方法の中から適当な方法を任意に選択すればよく、中塗り塗膜の上に透明性のある光輝性上塗り塗膜を形成する場合には、グレー色系の中塗り塗料またはカラー中塗り塗料等が用いられる。これは、中塗り塗膜と上塗り塗膜との複合色を発現させ、意匠性を高めるために行われるものである。中塗り塗膜の乾燥膜厚は、20〜100μmが好ましく、より好ましくは30〜50μmである。
Next, an intermediate coating is applied onto the electrodeposition coating film and baked and dried to form an intermediate coating film. The intermediate coating film functions as a base for smoothing the final composite coating film to form a coating film with a good appearance, serving as a binder between the electrodeposition coating film and the top coating film, and reaching through the composite coating film. The weather resistance to the deterioration of the coating film by ultraviolet rays or water is required. There are no particular restrictions on the intermediate coating, and other than solvent-based coatings, water-based coatings, powder coatings or high solid coatings can also be applied. Specifically, epoxy ester / melamine resins, aminoalkyds / Melamine-based resin or oil-free polyester / melamine-based resin paint, etc., can be appropriately selected from conventionally known intermediate coatings.
The pigment contained in the intermediate coating is preferably a color pigment or an extender pigment. Among these, as pigments, inorganic pigments such as titanium dioxide, carbon black, graphite and iron oxide; organic pigments such as phthalocyanine blue, phthalocyanine green, quinacridone, indanthrone, isoindolinone, perylene and anthrapyrimidine are used. As the extender, barium sulfate, aluminum silicate, or the like can be used.
Regarding the intermediate coating film forming method, an appropriate method may be arbitrarily selected from conventionally known methods. When forming a transparent glittering top coating film on the intermediate coating film, A gray-colored intermediate coating or a color intermediate coating is used. This is performed in order to develop a composite color of the intermediate coating film and the top coating film and to improve the design. The dry film thickness of the intermediate coating film is preferably 20 to 100 μm, more preferably 30 to 50 μm.

以下、本発明の特徴工程について順次詳述する。
(1)中塗り塗膜研磨工程:
本発明の光輝性複合塗膜形成方法は、中塗り塗膜の異常部位およびその周辺部位を研磨する工程を有する。加熱乾燥した中塗り塗膜面をチェックし、不具合の原因となる異常部位(付着した塵埃、タレ、ピンホール、くぼみ等)を除去し修正するものである。
まず、カッターナイフ、小刃等の工具を用いて中塗り塗膜の異常部位を除去し、上記異常部位を除去した後の部位およびその周囲部位10〜200mm程度の幅を研磨紙で研磨する。研磨方法等に関しては、従来公知の方法の中から任意に選択することができ、使用する研磨剤や研磨紙の種類等は研磨する塗膜異常部位の状態に応じて適宜決定すればよい。異常部位の数が少なくかつ小さい場合、研磨回数は少なくて済み、その分、中塗り塗膜研磨部位に生じる研ぎ傷は少なく収まるため研ぎ染みが生じにくい。一方、異常部位の数が多く、および/または、異常部位の面積が大きい場合、研磨回数は数十回以上にも及び、また、研磨部位に生じる研ぎ傷は数多く、かつ、深くなり、その結果、研ぎ染みがより広範囲に、かつ、顕著に生じる傾向があった。
Hereinafter, the characteristic steps of the present invention will be described in detail.
(1) Intermediate coating film polishing process:
The method for forming a glittering composite coating film of the present invention includes a step of polishing an abnormal part of an intermediate coating film and its peripheral part. The heat-dried intermediate coating film surface is checked, and abnormal parts (attached dust, sagging, pinholes, dents, etc.) that cause problems are removed and corrected.
First, an abnormal part of the intermediate coating film is removed using a tool such as a cutter knife or a small blade, and the part after the abnormal part is removed and a width of about 10 to 200 mm around the part are polished with abrasive paper. The polishing method and the like can be arbitrarily selected from conventionally known methods, and the type of abrasive or abrasive paper to be used may be appropriately determined according to the state of the abnormal portion of the coating film to be polished. When the number of abnormal sites is small and small, the number of polishings can be reduced, and the amount of polishing scratches generated in the intermediate coating film polishing site is reduced accordingly, so that it is difficult to cause sharp stains. On the other hand, when the number of abnormal parts is large and / or the area of the abnormal part is large, the number of polishing is several tens of times or more, and the number of sharpened scratches generated in the polished part is many and deep. , Sharpening stains tended to occur more extensively and significantly.

(2)補修用光輝性ベース塗料の塗布工程:
中塗り塗膜の異常部位およびその周辺部位を研磨した後、該研磨部位を含む中塗り塗膜全面に、粗大粒子の混入が抑制された、特定の粒度分布および平均粒径の光輝性顔料を含有する補修用光輝性ベース塗料を塗布し、未加熱乾燥状態の補修用光輝性ベース塗膜を形成する。ここで、該補修用光輝性ベース塗料は、粒度分布測定装置を用いて測定したd10が5〜7μm、d50(平均粒径)が10〜13μm、およびd90が19〜22μmである光輝性顔料を塗料固形分中7.5〜10質量%含む光輝性塗料である。
このように、補修用光輝性ベース塗料中の光輝性顔料は、粗大粒子の混入が抑制され、かつ、特定の粒度分布および平均粒径を有するため、従来、光輝性ベース塗料を中塗り塗膜研磨部位に直接塗布していた場合に生じた、前記研磨部位における、光輝性顔料の粒度分布がブロードであることによって生じる、特に、粗大粒子が研ぎ傷部分に不規則配列することに基づく配向ムラが大幅に解消されて、光輝性複合塗膜の研ぎ染みの問題が解消され、光輝性ベース塗料に配合できる光輝性顔料の選択の幅が拡大するため、研ぎ染み等の問題が生じやすいがために光輝性ベース塗料中への配合が躊躇された、30μmを超える粗大粒子を多量に含む光輝性顔料を配合した光輝性ベース塗料の使用が可能となり、上記光輝性ベース塗料および上塗りクリヤー塗料を塗布して形成した未加熱乾燥状態の塗膜を、同時に焼き付け乾燥することによって、粒子感の強い、より光輝性が高い、仕上がり外観のきわめて優れた光輝性複合塗膜を形成することが可能となる。
(2) Applying process for glittering base paint for repair:
After polishing the abnormal part of the intermediate coating film and its peripheral part, a glittering pigment having a specific particle size distribution and average particle diameter in which coarse particles are prevented from being mixed on the entire surface of the intermediate coating film including the polishing part. The repairing glitter base coating for repairing is applied to form a repair glittering base coating film in an unheated and dried state. Here, the glittering base paint for repair is a glittering pigment having a d10 of 5 to 7 μm, a d50 (average particle diameter) of 10 to 13 μm, and a d90 of 19 to 22 μm, measured using a particle size distribution measuring device. It is a glittering paint containing 7.5 to 10% by mass in the solid content of the paint.
As described above, the glitter pigment in the repair glitter base paint has a specific particle size distribution and average particle diameter, and the glitter paint is conventionally used as an intermediate coating film because the incorporation of coarse particles is suppressed. Unevenness due to the irregular distribution of coarse particles in the scratched part, which occurs when the particle size distribution of the bright pigment in the polishing part is broad, which is generated when it is applied directly to the polishing part. Because the problem of sharpening of the glittering composite coating is resolved and the range of options for the bright pigments that can be blended into the glittering base paint is expanded, problems such as sharpening are likely to occur. In addition, it is possible to use a glittering base paint containing a glittering pigment containing a large amount of coarse particles exceeding 30 μm, which is formulated into the glittering base paint. Forming a brilliant composite coating with a strong particle feeling, higher brilliancy, and excellent finished appearance by simultaneously baking and drying the unheated and dried coating formed by applying the rear coating. Is possible.

該補修用光輝性ベース塗料は、粒度分布測定装置を用いて測定したd10が5〜7μm、d50(平均粒径)が10〜13μm、およびd90が19〜22μmである光輝性顔料を塗料固形分中7.5〜10質量%含むが、含有量が7.5質量%未満では、補修用光輝性ベース塗膜としての効果は期待できるものの、隠蔽力が低下するため望ましい色相の塗膜が得られず、10質量%を超えると補修効果が損なわれ仕上がり外観に優れる塗膜が得られない。   The repair base paint for repair is obtained by adding a bright pigment having a d10 of 5 to 7 μm, a d50 (average particle diameter) of 10 to 13 μm, and a d90 of 19 to 22 μm, measured using a particle size distribution measuring device, to a solid content of the paint. Although the content is 7.5 to 10% by mass, if the content is less than 7.5% by mass, the effect as a glittering base coating film for repair can be expected, but the coating power with a desirable hue is obtained because the hiding power is reduced. When the amount exceeds 10% by mass, the repair effect is impaired and a coating film having an excellent finished appearance cannot be obtained.

かかる補修用光輝性ベース塗料の成分・組成は、次工程で使用する光輝性ベース塗料と同じ種類であっても異なった種類であってもよいが補修用光輝性ベース塗膜と光輝性ベース塗膜との屈折率等の光学的特性を合わせる塗布工程におけるビヒクル・溶剤成分の不相溶等に起因する塗膜白濁化回避の点から同じ種類であることが好ましい。すなわち、補修用光輝性ベース塗料に用いるビヒクル、添加剤および溶剤は、後述する光輝性ベース塗料で用いるものを用いることができ、補修用光輝性ベース塗料と光輝性ベース塗料とは同じ成分・組成で光輝性顔料の粒度分布のみが異なるのが好ましい。
そして、上記補修用光輝性ベース塗料の光輝性顔料は、前記した仕上がり外観のきわめて優れた光輝性複合塗膜を形成する上で、アルミニウムフレーク顔料および/または着色アルミニウムフレーク顔料を用いることが特に好ましい。
なお、この補修用光輝性ベース塗膜層の中塗り塗膜非研磨部位における乾燥膜厚は、5〜25μmであることが好ましく、より好ましくは5〜15μmである。
The components and composition of such a glittering base coating material for repair may be the same or different from the glittering base coating material used in the next step. The same type is preferable from the viewpoint of avoiding clouding of the coating film due to incompatibility of vehicle and solvent components in the coating process for matching optical characteristics such as refractive index with the film. That is, the vehicle, additive, and solvent used in the glittering base paint for repair can be those used in the glittering base paint described later, and the same composition and composition are used for the glittering base paint for repair and the glittering base paint for repair. It is preferable that only the particle size distribution of the glitter pigment is different.
In addition, it is particularly preferable to use an aluminum flake pigment and / or a colored aluminum flake pigment as the glitter pigment of the repair glitter base paint for forming the glitter composite coating film having an extremely excellent finished appearance. .
In addition, it is preferable that the dry film thickness in the intermediate coating film non-polishing part of this glittering base coating film layer for repair is 5-25 micrometers, More preferably, it is 5-15 micrometers.

(3)光輝性ベース塗料/上塗りクリヤー塗料の塗布工程:
上記工程(2)において、研磨部位を含む中塗り塗膜全面に上記補修用光輝性ベース塗料を塗布して形成した未加熱乾燥状態の補修用光輝性ベース塗膜の上に、光輝性ベース塗料を用いて未加熱乾燥状態の光輝性ベース塗膜を形成し、更にその上に上塗りクリヤー塗料を用いて上塗りクリヤー塗膜を形成し、前記未加熱乾燥状態の補修用光輝性ベース塗膜、光輝性ベース塗膜、および上塗りクリヤー塗膜を同時に焼き付け乾燥する方法により形成する。
光輝性ベース塗料のビヒクルを構成する塗膜形成用樹脂としては、例えば、(a)アクリル樹脂、(b)ポリエステル樹脂、(c)アルキッド樹脂、(d)フッ素系樹脂、(e)エポキシ樹脂、(f)ポリウレタン樹脂、(g)ポリエーテル樹脂等が挙げられ、これらは、単独または2種以上を組み合わせて使用することができる。特に、アクリル樹脂、ポリエステル樹脂が好ましく用いられる。また、上記塗膜形成用樹脂には、硬化反応性を有するタイプとラッカータイプがあるが、通常硬化反応性を有するタイプのものが使用される。硬化反応性を有するタイプの場合には、アミノ樹脂、(ブロック)ポリイソシアネート化合物、アミン系、ポリアミド系、多価カルボン酸等の架橋剤と混合して用いられ、加熱または常温で硬化反応を進行させることができる。また、硬化反応性を有しないラッカータイプの塗膜形成用樹脂と硬化反応性を有するタイプとを併用することも可能である。
(3) Application process of glitter base coating / top clear coating:
In the above step (2), the glittering base coating is formed on the repairable glittering base coating in an unheated and dried state, which is formed by applying the repairing glittering base coating on the entire surface of the intermediate coating including the polished part. Is used to form an unheated and dried glitter-based coating, and an overcoat clear coating is further formed thereon, and the unheated and dried glitter-based coating for repair, The base coat film and the top clear film are simultaneously baked and dried.
Examples of the resin for forming a coating film constituting the vehicle of the glitter base paint include (a) acrylic resin, (b) polyester resin, (c) alkyd resin, (d) fluorine-based resin, (e) epoxy resin, (F) Polyurethane resin, (g) polyether resin, etc. are mentioned, These can be used individually or in combination of 2 or more types. In particular, an acrylic resin and a polyester resin are preferably used. In addition, the coating film-forming resin includes a type having a curing reactivity and a lacquer type, and a type having a curing reactivity is usually used. In the case of a type having curing reactivity, it is used by mixing with a crosslinking agent such as an amino resin, a (block) polyisocyanate compound, an amine, a polyamide, or a polyvalent carboxylic acid, and the curing reaction proceeds at heating or at room temperature. Can be made. It is also possible to use a lacquer-type resin for forming a coating film having no curing reactivity and a type having a curing reactivity in combination.

上記アクリル樹脂(a)としては、アクリル系モノマーと他のエチレン性不飽和モノマーとの共重合体を挙げることができる。上記共重合に使用し得るアクリル系モノマーとしては、アクリル酸またはメタクリル酸のメチル、エチル、プロピル、n−ブチル、i−ブチル、t−ブチル、2−エチルヘキシル、ラウリル、フェニル、ベンジル、2−ヒドロキシエチル、2−ヒドロキシプロピル等のエステル化物、アクリル酸またはメタクリル酸2−ヒドロキシエチルのカプロラクトンの開環付加物、アクリルアミド、メタクリルアミドおよびN−メチロールアクリルアミド等が挙げられる。これらと共重合可能な他のエチレン性不飽和モノマーとしては、スチレン、α−メチルスチレン、イタコン酸、マレイン酸、酢酸ビニル等が挙げられる。   As said acrylic resin (a), the copolymer of an acryl-type monomer and another ethylenically unsaturated monomer can be mentioned. Acrylic monomers that can be used for the copolymerization include methyl, ethyl, propyl, n-butyl, i-butyl, t-butyl, 2-ethylhexyl, lauryl, phenyl, benzyl, 2-hydroxy of acrylic acid or methacrylic acid. Examples thereof include esterified products such as ethyl and 2-hydroxypropyl, ring-opening adducts of caprolactone of acrylic acid or 2-hydroxyethyl methacrylate, acrylamide, methacrylamide and N-methylolacrylamide. Examples of other ethylenically unsaturated monomers copolymerizable with these include styrene, α-methylstyrene, itaconic acid, maleic acid, and vinyl acetate.

上記ポリエステル樹脂(b)としては、飽和ポリエステル樹脂や不飽和ポリエステル樹脂が挙げられ、例えば、多塩基酸と多価アルコールを加熱縮合して得られた縮合物が挙げられる。多塩基酸としては、例えば、飽和多塩基酸、不飽和多塩基酸が挙げられ、飽和多塩基酸としては、例えば、無水フタル酸、テレフタル酸、コハク酸等が挙げられ、不飽和多塩基酸としては、例えば、マレイン酸、無水マレイン酸、フマル酸等が挙げられる。多価アルコールとしては、例えば、二価アルコール、三価アルコール等が挙げられ、二価アルコールとしては、例えば、エチレングリコール、ジエチレングリコール等が挙げられ、三価アルコールとしては、例えば、グリセリン、トリメチロールプロパン等が挙げられる。   As said polyester resin (b), saturated polyester resin and unsaturated polyester resin are mentioned, For example, the condensate obtained by heat-condensing a polybasic acid and a polyhydric alcohol is mentioned. Examples of the polybasic acid include saturated polybasic acid and unsaturated polybasic acid. Examples of the saturated polybasic acid include phthalic anhydride, terephthalic acid, succinic acid and the like, and unsaturated polybasic acid. Examples thereof include maleic acid, maleic anhydride, and fumaric acid. Examples of the polyhydric alcohol include dihydric alcohol and trihydric alcohol. Examples of the dihydric alcohol include ethylene glycol and diethylene glycol. Examples of the trihydric alcohol include glycerin and trimethylolpropane. Etc.

上記アルキッド樹脂(c)としては、上記多塩基酸と多価アルコールにさらに油脂・脂肪酸(大豆油、アマニ油、ヤシ油、ステアリン酸等)、天然樹脂(ロジン、コハク等)等の変性剤を反応させて変性させることによって得られたアルキッド樹脂を用いることができる。   As said alkyd resin (c), modifiers, such as fats and fatty acids (soybean oil, linseed oil, coconut oil, stearic acid, etc.), natural resins (rosin, succinic acid, etc.), etc. are added to the polybasic acid and polyhydric alcohol. An alkyd resin obtained by reaction and modification can be used.

上記フッ素系樹脂(d)としては、フッ化ビニリデン樹脂、四フッ化エチレン樹脂のいずれかまたはこれらの混合体、フルオロオレフィンとヒドロキシ基含有の重合性化合物およびその他の共重合可能なビニル系化合物からなる単量体を共重合させて得られる各種フッ素系共重合体からなる樹脂を挙げることができる。   Examples of the fluororesin (d) include any one of vinylidene fluoride resin, tetrafluoroethylene resin or a mixture thereof, a polymerizable compound containing a fluoroolefin and a hydroxy group, and other copolymerizable vinyl compounds. Examples thereof include resins made of various fluorine-based copolymers obtained by copolymerizing the following monomers.

上記エポキシ樹脂(e)としては、ビスフェノールとエピクロルヒドリンの反応によって得られる樹脂等を挙げることができる。ビスフェノールとしては、例えば、ビスフェノールA、F等が挙げられる。上記ビスフェノール型エポキシ樹脂としては、例えば、エピコート828、エピコート1001、エピコート1004、エピコート1007、エピコート1009(いずれも商品名、シェルケミカル社製)等が挙げられ、またこれらを適当な鎖延長剤を用いて鎖延長したものも用いることができる。   As said epoxy resin (e), the resin etc. which are obtained by reaction of bisphenol and epichlorohydrin can be mentioned. Examples of bisphenol include bisphenol A and F. Examples of the bisphenol type epoxy resin include Epicoat 828, Epicoat 1001, Epicoat 1004, Epicoat 1007, Epicoat 1009 (all trade names, manufactured by Shell Chemical Co., Ltd.), and the like, and these are used with an appropriate chain extender. A chain-extended one can also be used.

上記ポリウレタン樹脂(f)としては、アクリル、ポリエステル、ポリエーテル、ポリカーボネート等の各種ポリオール成分とポリイソシアネート化合物との反応によって得られるウレタン結合を有する樹脂を挙げることができる。上記ポリイソシアネート化合物としては、2,4−トリレンジイソシアネート(2,4−TDI)、2,6−トリレンジイソシアネート(2,6−TDI)、およびその混合物(TDI)、ジフェニルメタン−4,4’−ジイソシアネート(4,4’−MDI)、ジフェニルメタン−2,4’−ジイソシアネート(2,4’−MDI)、およびその混合物(MDI)、ナフタレン−1,5−ジイソシアネート(NDI)、3,3’−ジメチル−4,4’−ビフェニレンジイソシアネート(TODI)、キシリレンジイソシアネート(XDI)、ジシクロへキシルメタン・ジイソシアネート(水素化HDI)、イソホロンジイソシアネート(IPDI)、へキサメチレンジイソシアネート(HDI)、水素化キシリレンジイソシアネート(HXDI)等を挙げることができる。   As said polyurethane resin (f), resin which has a urethane bond obtained by reaction of various polyol components, such as an acryl, polyester, polyether, a polycarbonate, and a polyisocyanate compound can be mentioned. Examples of the polyisocyanate compound include 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), and mixtures thereof (TDI), diphenylmethane-4,4 ′. Diisocyanate (4,4′-MDI), diphenylmethane-2,4′-diisocyanate (2,4′-MDI), and mixtures thereof (MDI), naphthalene-1,5-diisocyanate (NDI), 3,3 ′ -Dimethyl-4,4'-biphenylene diisocyanate (TODI), xylylene diisocyanate (XDI), dicyclohexylmethane diisocyanate (hydrogenated HDI), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), hydrogenated xylylene diene Isocyanate (HX I), and the like can be given.

上記ポリエーテル樹脂(g)としては、エーテル結合を有する重合体または共重合体であり、ポリオキシエチレン系ポリエーテル、ポリオキシプロピレン系ポリエーテル、もしくはポリオキシブチレン系ポリエーテル、またはビスフェノールAもしくはビスフェノールFなどの芳香族ポリヒドロキシ化合物から誘導されるポリエーテル等の1分子当たりに少なくとも2個の水酸基を有するポリエーテル樹脂が挙げられる。また上記ポリエーテル樹脂とコハク酸、アジピン酸、セバシン酸、フタル酸、イソフタル酸、テレフタル酸、トリメリット酸等の多価カルボン酸類、または、これらの酸無水物等の反応性誘導体とを反応させて得られるカルボキシル基含有ポリエーテル樹脂が挙げられる。   The polyether resin (g) is a polymer or copolymer having an ether bond, and is a polyoxyethylene polyether, polyoxypropylene polyether, polyoxybutylene polyether, bisphenol A or bisphenol. Examples thereof include polyether resins having at least two hydroxyl groups per molecule, such as polyethers derived from aromatic polyhydroxy compounds such as F. Also, the polyether resin is reacted with a polyvalent carboxylic acid such as succinic acid, adipic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, trimellitic acid, or a reactive derivative such as these acid anhydrides. And a carboxyl group-containing polyether resin obtained.

上記ビヒクルが架橋剤を含む場合、塗膜形成用樹脂と架橋剤の割合としては、固形分換算で塗膜形成用樹脂が90〜50質量%、架橋剤が10〜50質量%であり、好ましくは塗膜形成用樹脂が85〜60質量%であり、架橋剤が15〜40質量%である。架橋剤が10質量%未満では(塗膜形成用樹脂が90質量%を超えると)、塗膜中の架橋が十分でない。一方、架橋剤が50質量%を超えると(塗膜形成用樹脂が50質量%未満では)、塗料組成物の貯蔵安定性が低下するとともに硬化速度が大きくなるため、塗膜外観が悪くなるおそれが生じる。   When the vehicle includes a cross-linking agent, the ratio of the resin for forming a coating film to the cross-linking agent is preferably 90 to 50% by mass of the resin for forming a film and 10 to 50% by mass of the cross-linking agent in terms of solid content. The film-forming resin is 85 to 60% by mass, and the crosslinking agent is 15 to 40% by mass. When the crosslinking agent is less than 10% by mass (when the coating film forming resin exceeds 90% by mass), crosslinking in the coating film is not sufficient. On the other hand, if the cross-linking agent exceeds 50% by mass (if the coating film-forming resin is less than 50% by mass), the storage stability of the coating composition is lowered and the curing rate is increased, which may deteriorate the appearance of the coating film. Occurs.

上記ビヒクルが架橋剤を含む場合、架橋剤としては、アミノ樹脂、特にメラミン樹脂が好ましい。上記メラミン樹脂としては、n−ブチル基またはi−ブチル基単独によりエーテル化されたブチル化メラミン樹脂、n−ブチル基またはi−ブチル基およびメチル基によりエーテル化されたメチル・ブチル混合エーテル化メラミン樹脂がより好ましい。また、上記以外のものであっても、他のアミノ樹脂、例えば、ベンゾグアナミン樹脂等を使用することができる。   When the vehicle contains a crosslinking agent, the crosslinking agent is preferably an amino resin, particularly a melamine resin. Examples of the melamine resin include butylated melamine resin etherified by n-butyl group or i-butyl group alone, and methyl / butyl mixed etherified melamine etherified by n-butyl group or i-butyl group and methyl group. A resin is more preferable. In addition, other amino resins such as benzoguanamine resin can be used even if they are other than the above.

上記光輝性ベース塗料に含有される顔料は、光輝性顔料および必要により着色顔料を併用する。光輝性顔料としては、例えばアルミニウムフレーク顔料、着色アルミニウムフレーク顔料、マイカ顔料、金属チタンフレーク顔料、アルミナフレーク顔料、シリカフレーク顔料、二酸化チタン被覆ガラスフレーク顔料、グラファイト顔料、ステンレスフレーク顔料、ホログラム顔料、または板状酸化鉄顔料等が挙げられる。
これらのなかでも、本発明における粒子感の強い、より光輝性が高い、仕上がり外観のきわめて優れた光輝性複合塗膜を形成するには、光輝性顔料としてアルミニウムフレーク顔料および/または着色アルミニウムフレーク顔料を用いることが特に好ましい。
また、着色顔料として、アゾレーキ系顔料、フタロシアニン系顔料、インジゴ系顔料、ペリレン系顔料、キノフタロン系顔料、ジオキサジン系顔料、キナクリドン系顔料、イソインドリノン系顔料、金属錯体顔料等の有機着色顔料;黄色酸化鉄顔料、ベンガラ顔料、二酸化チタン顔料、カーボンブラック顔料等の無機着色顔料が挙げられる。また各種体質顔料等を併用することができる。
As the pigment contained in the glitter base coating material, a glitter pigment and, if necessary, a colored pigment are used in combination. Examples of glitter pigments include aluminum flake pigment, colored aluminum flake pigment, mica pigment, metal titanium flake pigment, alumina flake pigment, silica flake pigment, titanium dioxide-coated glass flake pigment, graphite pigment, stainless steel flake pigment, hologram pigment, or Examples thereof include plate-like iron oxide pigments.
Among these, in order to form a glittering composite coating film having a strong particle feeling, a higher glitter, and an excellent finished appearance in the present invention, an aluminum flake pigment and / or a colored aluminum flake pigment is used as the glitter pigment. It is particularly preferable to use
In addition, as colored pigments, organic colored pigments such as azo lake pigments, phthalocyanine pigments, indigo pigments, perylene pigments, quinophthalone pigments, dioxazine pigments, quinacridone pigments, isoindolinone pigments, metal complex pigments; yellow Examples thereof include inorganic coloring pigments such as iron oxide pigments, bengara pigments, titanium dioxide pigments, and carbon black pigments. Various extender pigments can be used in combination.

上記光輝性ベース塗料は、上記成分のほかに、脂肪族アミドの潤滑分散体であるポリアミドワックスや酸化ポリエチレンを主体としたコロイド状分散体であるポリエチレンワックス、沈降防止剤、乾燥触媒、紫外線吸収剤、酸化防止剤、レベリング剤、シリコーン系や有機高分子等の表面調整剤、タレ止め剤、増粘剤、消泡剤、架橋性重合体粒子(ミクロゲル)等を適宜添加して含有することができる。これらの添加剤は、通常、上記ビヒクル100質量部(固形分基準)に対して例えば、それぞれ15質量部以下の割合で配合することにより、塗料や塗膜の性能を改善することができる。
上記光輝性ベース塗料は、上記構成成分を、通常、溶剤に溶解または分散した態様で提供される。溶剤としては、ビヒクルを溶解または分散するものであればよく、有機溶剤および/または水を使用し得る。有機溶剤としては、塗料分野において通常用いられるものを挙げることができる。例えば、トルエン、キシレン、ソルベッソ100,ソルベッソ150、メチルシクロヘキサン等の炭化水素類;アセトン、メチルエチルケトン、メチルイソブチルケトン、シクロヘキサノン等のケトン類;酢酸エチル、酢酸n−ブチル、酢酸イソブチル、セロソルブアセテート、プロピレングリコールモノメチルエーテルアセテート等のエステル類;メタノール、エタノール、n−ブタノール、イソプロピルアルコール、シクロヘキサノール等のアルコール類;メチルセロソルブ、ブチルセロソルブ、メチルカルビトール、カルビトール、ブチルカルビトール等のエーテル類等を例示できる。環境面の観点から有機溶剤の使用が規制されている場合には、水を用いることが好ましい。この場合、適量の親水性有機溶剤を含有させてもよい。
In addition to the above-mentioned components, the glittering base paint includes a polyamide wax which is a lubricating dispersion of an aliphatic amide, a polyethylene wax which is a colloidal dispersion mainly composed of polyethylene oxide, an anti-settling agent, a drying catalyst, and an ultraviolet absorber. , Antioxidants, leveling agents, surface conditioners such as silicones and organic polymers, sagging inhibitors, thickeners, antifoaming agents, crosslinkable polymer particles (microgels) and the like may be added as appropriate. it can. These additives can improve the performance of paints and coating films by blending, for example, at a ratio of 15 parts by mass or less with respect to 100 parts by mass (based on solid content) of the vehicle.
The glittering base coating is usually provided in a form in which the constituent components are dissolved or dispersed in a solvent. Any solvent can be used as long as it dissolves or disperses the vehicle, and an organic solvent and / or water can be used. Examples of the organic solvent include those usually used in the paint field. For example, hydrocarbons such as toluene, xylene, Solvesso 100, Solvesso 150, methylcyclohexane; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone; ethyl acetate, n-butyl acetate, isobutyl acetate, cellosolve acetate, propylene glycol Examples include esters such as monomethyl ether acetate; alcohols such as methanol, ethanol, n-butanol, isopropyl alcohol, and cyclohexanol; ethers such as methyl cellosolve, butyl cellosolve, methyl carbitol, carbitol, and butyl carbitol. Water is preferably used when the use of organic solvents is restricted from an environmental point of view. In this case, an appropriate amount of a hydrophilic organic solvent may be contained.

上記光輝性ベース塗料において、光輝性顔料の含有量は、塗料固形分中7.5〜10質量%であることが好ましい。
上記光輝性ベース塗膜の乾燥膜厚は、5〜30μmが好ましく、より好ましくは5〜10μmである。
In the glitter base paint, the content of the glitter pigment is preferably 7.5 to 10% by mass in the solid content of the paint.
5-30 micrometers is preferable and, as for the dry film thickness of the said glittering base coating film, More preferably, it is 5-10 micrometers.

さらに上記光輝性ベース塗膜上には、トップコート層として、上塗りクリヤー塗膜を少なくとも一層形成する。上塗りクリヤー塗膜の乾燥膜厚は、20〜100μmが好ましく、この範囲を外れると塗膜外観が低下する恐れが生じる。より好ましくは30〜50μmである。
また、上記上塗りクリヤー塗膜は、溶剤型塗料、水性塗料または粉体型塗料から形成してもよい。溶剤型塗料または水性塗料としては、一液型塗料を用いてもよいし、二液型ウレタン樹脂塗料等のような二液型樹脂を用いてもよい。
上記上塗りクリヤー塗料としては、上塗り用として一般に使用されているものを用いることができる。特に、特公平8−19315号公報に記載されたカルボキシル基含有ポリマーとエポキシ基含有ポリマーとを含有するクリヤー塗料が、耐酸性雨対策および前記ウェット・オン・ウェット方式で光輝性ベース塗膜上に塗装した際に、光輝性ベース塗膜における光輝性顔料の配向を乱さないという観点から好ましく用いられる。また、これらのクリヤー塗料は、必要に応じて、その透明性を損なわない範囲で、着色顔料、体質顔料、改質剤、紫外線吸収剤、レベリング剤、分散剤、消泡剤等の添加剤を含むことができる。
Furthermore, at least one clear clear coating film is formed as a top coat layer on the glittering base coating film. The dry film thickness of the top clear film is preferably 20 to 100 μm, and if it is out of this range, the appearance of the coating film may be lowered. More preferably, it is 30-50 micrometers.
Further, the above clear clear coating film may be formed from a solvent-type paint, a water-based paint or a powder-type paint. As the solvent-based paint or water-based paint, a one-component paint may be used, or a two-component resin such as a two-component urethane resin paint may be used.
As the overcoat clear paint, those generally used for topcoat can be used. In particular, a clear coating containing a carboxyl group-containing polymer and an epoxy group-containing polymer described in Japanese Patent Publication No. 8-19315 is provided on a glittering base coating film by acid rain resistance and the wet-on-wet method. From the viewpoint of not disturbing the orientation of the glitter pigment in the glitter base coating film when applied, it is preferably used. In addition, these clear paints may contain additives such as coloring pigments, extender pigments, modifiers, ultraviolet absorbers, leveling agents, dispersants, antifoaming agents, etc., as long as the transparency is not impaired. Can be included.

(4)補修用光輝性ベース塗膜/光輝性ベース塗膜/上塗りクリヤー塗膜の焼き付け乾燥工程:
本発明における工程(4)では、上記の未加熱乾燥状態の補修用光輝性ベース塗膜、光輝性ベース塗膜および上塗りクリヤー塗膜を同時に焼き付け乾燥する。焼き付け乾燥条件としては、120〜160℃で所定時間焼き付け乾燥され、光輝性複合塗膜を得ることができる。
(4) Baking and drying process of repairing glitter base coating / brilliance base coating / overcoat clear coating:
In the step (4) in the present invention, the above-mentioned repaired glittering base coating film, dry glittering base coating film and topcoat clear coating film in an unheated and dried state are simultaneously baked and dried. As the baking and drying conditions, a brilliant composite coating film can be obtained by baking and drying at 120 to 160 ° C. for a predetermined time.

次に、本発明を、実施例を挙げてさらに具体的に説明するが、本発明はこれらの実施例にのみ限定されるものではない。なお、配合量は特に断りのないかぎり質量部を表す。   EXAMPLES Next, although an Example is given and this invention is demonstrated further more concretely, this invention is not limited only to these Examples. In addition, a compounding quantity represents a mass part unless there is particular notice.

実施例1〜2および比較例1〜2
[中塗り塗膜の形成]
ダル鋼板(長さ300mm、幅100mmおよび厚さ0.8mm)を燐酸亜鉛処理剤(商品名:「サーフダインSD2000」、日本ペイント社製)を使用して化成処理した後、カチオン電着塗料(商品名:「パワートップV−8」、日本ペイント社製)を平均乾燥膜厚が25μmとなるように電着塗装した。次いで、160℃で30分間焼き付けた後、電着塗膜上に中塗り塗料としてポリエステル/メラミン系中塗り塗料(商品名:「オルガF−60」、日本ペイント社製)を酢酸エチル/ソルベッソ100(シェル化学社製)/ブチルジグリコールアセテート=1/1/1(重量比)を用いて、フォードカップNo.4による粘度が30秒となるように調整し、回転式静電塗装機を用いて中塗り塗装を行い、140℃×30分の条件で焼き付け乾燥し、平均乾燥膜厚30μmの中塗り塗膜を形成した。
[研磨工程]
本発明の補修用光輝性ベース塗料の効果を明らかなものとするために、焼き付け乾燥した前記中塗り塗膜を、600番および800番の研磨紙を用いて、5回、10回、20回、30回、60回および90回の6水準で、研磨紙の面を使い円を描くように研ぎ上げる丸研ぎおよび研磨紙の面を使い左右または上下の往復運動により研ぎ上げる立研ぎにより研磨した。
[補修用光輝性ベース塗料]
本発明の補修用光輝性ベース塗料用の光輝性顔料として光輝性顔料1Aおよび1Cを、比較例用に光輝性顔料1Bを用いた。表1の配合比率で原料を撹拌容器に順次仕込み、回転式攪拌機にて、実施例1〜2用の製造例1(2A塗料)および製造例2(2B塗料)、ならびに比較例1〜2用の製造例3(2C塗料)および製造例4(2D塗料)を調製した。
光輝性顔料1A・・・アルミニウムフレーク顔料(d10=6μm、d50=11μm、d90=20μm)
光輝性顔料1B・・・アルミニウムフレーク顔料(d10=10μm、d50=19μm、d90=30μm)
光輝性顔料1C・・・着色アルミニウムフレーク顔料(d10=6.4μm、d50=11.3μm、d90=19.7μm)
[補修用光輝性ベース塗膜の調製]
実施例1〜2では、次に、研磨部分、研磨部位周辺部分および非研磨部分の中塗り塗膜の全面に、第1ステージとして、2A塗料および2B塗料を非補修部分の平均乾燥膜厚が9μmとなるように、回転霧化型静電塗装機を用いて未加熱乾燥状態の補修用光輝性ベース塗膜(2A塗膜、2B塗膜)を形成した。
比較例1〜2としては、第1ステージとして、2C塗料および2D塗料を用いて実施例1と同じ条件で未加熱乾燥状態の補修用光輝性ベース塗膜(2C塗膜、2D塗膜)を形成した。
[光輝性ベース塗膜および上塗りクリヤー塗膜の形成]
次に、実施例1〜2で得られた補修用光輝性ベース塗膜上および比較例1〜2で得られた補修用光輝性ベース塗膜上に、第1ステージから3分間のセッティング後に、第2ステージとして、実施例1〜2および比較例1〜2では光輝性顔料1Bを塗料固形分中に14質量%含有する光輝性ベース塗料であるアクリル/メラミン系樹脂塗料(商品名:「スーパーラックM−300」、日本ペイント社製)(3A塗料)を、トルエン/ソルベッソ100/酢酸ブチル/ブチルジグリコールアセテート=1/6/1/2(重量比)を用いて、フォードカップNo.4による粘度が13秒となるように調整し、霧化型静電塗装機を用いて平均乾燥膜厚が6μmとなるように未加熱乾燥状態の光輝性ベース塗膜を形成した。3分間のセッティング後、酸/エポキシ系上塗りクリヤー塗料(商品名:「マックフローO−580クリヤー」、日本ペイント社製)(4A塗料)を、ソルベッソ100/ジブチルジグリコールアセテート=8/2(重量比)を用いて、フォードカップNo.4による粘度が30秒となるように調整し、回転霧化型静電塗装機を用いて平均乾燥膜厚が40μmとなるように未加熱乾燥状態の上塗りクリヤー塗膜を形成した。
そして、上記未加熱乾燥状態の補修用光輝性ベース塗膜、光輝性ベース塗膜および上塗りクリヤー塗膜を同時に、140℃で30分間焼き付け乾燥させた。これを試験板として、形成された光輝性複合塗膜の研ぎ染み性を、以下の方法にて評価した。結果を表2に示す。
Examples 1-2 and Comparative Examples 1-2
[Formation of intermediate coating film]
Dull steel plate (length 300 mm, width 100 mm and thickness 0.8 mm) was subjected to chemical conversion treatment using a zinc phosphate treating agent (trade name: “Surfdyne SD2000”, manufactured by Nippon Paint Co., Ltd.), and then a cationic electrodeposition paint ( Product name: “Power Top V-8” (manufactured by Nippon Paint Co., Ltd.) was electrodeposited so that the average dry film thickness was 25 μm. Subsequently, after baking at 160 ° C. for 30 minutes, a polyester / melamine-based intermediate coating (trade name: “Orga F-60”, manufactured by Nippon Paint Co., Ltd.) as an intermediate coating on the electrodeposition coating film is ethyl acetate / solvesso 100 (Shell Chemical Co., Ltd.) / Butyl diglycol acetate = 1/1/1 (weight ratio) 4 was adjusted so that the viscosity was 30 seconds, and the intermediate coating was performed using a rotary electrostatic coating machine, and baked and dried under conditions of 140 ° C. × 30 minutes, and the intermediate coating film having an average dry film thickness of 30 μm Formed.
[Polishing process]
In order to clarify the effect of the glittering base paint for repair according to the present invention, the above-mentioned intermediate coating film which has been baked and dried is used 5 times, 10 times and 20 times using No. 600 and No. 800 abrasive papers. Polished by round sharpening that uses the surface of the abrasive paper to draw a circle, and sharpening that sharpens by reciprocating left and right or up and down using the surface of the abrasive paper at 6 levels of 30, 60, and 90 times .
[Glossy base paint for repair]
The glitter pigments 1A and 1C were used as the glitter pigments for the glitter base paint for repair of the present invention, and the glitter pigment 1B was used for the comparative example. The raw materials are sequentially charged into the stirring vessel at the blending ratios shown in Table 1, and using a rotary stirrer, Production Example 1 (2A paint) and Production Example 2 (2B paint) for Examples 1 and 2 and Comparative Examples 1 and 2 are used. Production Example 3 (2C paint) and Production Example 4 (2D paint) were prepared.
Bright pigment 1A ... aluminum flake pigment (d10 = 6 μm, d50 = 11 μm, d90 = 20 μm)
Bright pigment 1B ... aluminum flake pigment (d10 = 10 μm, d50 = 19 μm, d90 = 30 μm)
Bright pigment 1C ... colored aluminum flake pigment (d10 = 6.4 μm, d50 = 11.3 μm, d90 = 19.7 μm)
[Preparation of glitter-based coating film for repair]
In Examples 1 and 2, the average dry film thickness of the non-repaired portion of the 2A paint and 2B paint as the first stage is then applied to the entire surface of the intermediate coating film of the polishing portion, the polishing portion peripheral portion, and the non-polishing portion A non-heated dry glittering base coating film (2A coating film, 2B coating film) was formed using a rotary atomizing electrostatic coating machine so as to be 9 μm.
As Comparative Examples 1 and 2, as a first stage, using a 2C paint and a 2D paint, an unheated dry glittering base coating (2C paint, 2D paint) under the same conditions as in Example 1 Formed.
[Formation of glitter base coating and top clear coating]
Next, on the glittering base coating film for repair obtained in Examples 1-2 and on the glittering base coating film for repair obtained in Comparative Examples 1-2, after setting for 3 minutes from the first stage, As the second stage, in Examples 1 and 2 and Comparative Examples 1 and 2, an acrylic / melamine resin paint (trade name: “Super”, which is a glitter base paint containing 14% by mass of the glitter pigment 1B in the solid content of the paint) Rack M-300 "(manufactured by Nippon Paint Co., Ltd.) (3A paint) using Ford Cup No. 1 with toluene / solvesso 100 / butyl acetate / butyl diglycol acetate = 1/6/1/2 (weight ratio). A viscosity-based coating film in an unheated dry state was formed so that the average dry film thickness was 6 μm using an atomizing electrostatic coating machine. After setting for 3 minutes, an acid / epoxy-based clear paint (trade name: “MACFLOW O-580 Clear”, manufactured by Nippon Paint Co., Ltd.) (4A paint) is Solvesso 100 / dibutyl diglycol acetate = 8/2 (weight) Ratio), Ford Cup No. The viscosity of 4 was adjusted to 30 seconds, and an unheated dry clear coating film was formed using a rotary atomizing electrostatic coater so that the average dry film thickness was 40 μm.
Then, the repaired glittering base coating film for repairing, the glittering base coating film, and the top clear coating film in an unheated and dried state were simultaneously baked and dried at 140 ° C. for 30 minutes. Using this as a test plate, the sharpness of the formed glittering composite coating film was evaluated by the following method. The results are shown in Table 2.

[評価方法]
研ぎ染み性:試験板の光輝性複合塗膜における研磨部分と非研磨部分との研ぎ染みの有無を目視で評価した。
○…研磨部と非研磨部との研ぎ染みの差がなし
△…研磨部と非研磨部との研ぎ染みの差が僅かにあり
×…研磨部と非研磨部との研ぎ染みの差が顕著にあり
[Evaluation methods]
Abrasion stain: The presence or absence of sharp stain between the polished portion and the non-polished portion in the glittering composite coating film of the test plate was visually evaluated.
○: There is no difference in sharpening between the polished part and the non-polished part. △ ... There is a slight difference in sharpening between the polished part and the non-polished part. × ... The difference in sharpness between the polished part and the non-polished part is remarkable. In

Figure 2006212478
Figure 2006212478

Figure 2006212478
Figure 2006212478

表2記載の実施例1〜2および比較例1〜2の結果より、本発明の光輝性複合塗膜形成方法が優れた光輝性複合塗膜を与えることが明らかである。

From the results of Examples 1 and 2 and Comparative Examples 1 and 2 shown in Table 2, it is clear that the method for forming a glittering composite coating film of the present invention gives an excellent glittering composite coating film.

Claims (3)

被塗基材に電着塗膜、中塗り塗膜を形成後、光輝性ベース塗膜、上塗りクリヤー塗膜をウェット・オン・ウェット方式で塗膜形成する塗装方法であって、光輝性ベース塗料の塗布前に前記中塗り塗膜の異常部位を補修する工程を含み、以下の工程を順次行うことにより光輝性複合塗膜を形成することを特徴とする光輝性複合塗膜形成方法;
(1)前記中塗り塗膜の異常部位およびその周辺部位を研磨する工程、(2)前記研磨部位を含む中塗り塗膜全面に、粒度分布測定装置を用いて測定したd10が5〜7μm、d50が10〜13μm、およびd90が19〜22μmである光輝性顔料を塗料固形分中7.5〜10質量%含む補修用光輝性ベース塗料を用いて、未加熱乾燥状態の補修用光輝性ベース塗膜を形成する工程、(3)未加熱乾燥状態の前記補修用光輝性ベース塗膜上に、未加熱乾燥状態の前記光輝性ベース塗膜および前記上塗りクリヤー塗膜を形成する工程、(4)未加熱乾燥状態の前記補修用光輝性ベース塗膜、光輝性ベース塗膜および上塗りクリヤー塗膜を同時に焼き付け乾燥する工程。
A coating method for forming a glossy base coating film and a top clear coating film by wet-on-wet method after forming an electrodeposition coating film and an intermediate coating film on a substrate to be coated. A method of forming a glittering composite coating film, comprising the step of repairing an abnormal portion of the intermediate coating film before coating, and forming the glittering composite coating film by sequentially performing the following steps;
(1) The step of polishing the abnormal part of the intermediate coating film and the peripheral part thereof, (2) The entire surface of the intermediate coating film including the polishing part has a d10 of 5 to 7 μm measured using a particle size distribution measuring device. A repair glitter base for repairing in an unheated dry state using a glitter base paint for repair containing a glitter pigment having d50 of 10 to 13 μm and d90 of 19 to 22 μm in the solid content of the paint. A step of forming a coating film, (3) a step of forming the glittering base coating film in an unheated dry state and the clear clear coating film on the repairable glittering base coating film in an unheated and dried state, (4) ) A step of simultaneously baking and drying the repairing glitter base coating, the glitter base coating and the top clear coating in an unheated and dried state.
前記補修用光輝性ベース塗料における光輝性顔料がアルミニウムフレーク顔料および/または着色アルミニウムフレーク顔料である請求項1記載の光輝性複合塗膜形成方法。   The method for forming a glittering composite coating film according to claim 1, wherein the glittering pigment in the repairable glittering base coating material is an aluminum flake pigment and / or a colored aluminum flake pigment. 請求項1または2のいずれかに記載の塗装方法によって得られる塗装物。


A coated product obtained by the coating method according to claim 1.


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