JP4762792B2 - Paint for automobile outer plate and coating method thereof - Google Patents
Paint for automobile outer plate and coating method thereof Download PDFInfo
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Description
本発明は、金属部材とそれに付属するプラスチック製部材とからなる自動車外板の表面に、上塗り塗料を両部材上に同時に塗装し、該プラスチック製部材が熱変形しない温度で焼付乾燥することを特徴とする自動車外板の塗装方法及びそれに使用される塗料組成物に関する。 The present invention is characterized in that a top coat is simultaneously applied on both members on the surface of an automobile outer plate composed of a metal member and a plastic member attached thereto, and the plastic member is baked and dried at a temperature at which the plastic member is not thermally deformed. The present invention relates to a coating method for an automobile outer plate and a coating composition used therefor.
自動車車体の外板部には、鋼板などの金属部材と、プラスチックバンパーなどのプラスチック製部材とが併存して使用されることが多くなっている。又、車体の計量化を図るために、鋼板全体又はその一部を、プラスチックに置き換えることが試みられている。
そのような金属部材と、プラスチック製部材とが一体的に組み合わされた複合部材を塗装し、焼付けする場合、プラスチック製部材の種類によっては耐熱性が不十分な為、熱変形を起こしたり、塗膜の発泡等で外観品質が低下したりするため、目的とする複合部材を調製することができない問題がある。
そのため、金属部材とプラスチック製部材とは別々に塗料を塗装し、塗膜を焼付硬化することが一般に行われる。自動車車体鋼板部の上塗り塗料は、通常140℃前後で、20〜30分焼付けることで硬化する塗料が使用されている。FRPなどのプラスチック製部材は、常温乾燥もしくは100℃以下の低温で乾燥できる2液型ウレタン塗料が一般的に使われる。
従来、例えば、金属部材及びプラスチック部材が併存する自動車車体に、金属部材には水酸基含有樹脂、メラミン樹脂及び着色顔料を含有する着色塗料(A)を塗装し、プラスチック部材には、この着色塗料(A)にポリイソシアネート化合物を配合した着色塗料(B)を塗装する技術が提案されている(例えば、特許文献1参照)。
A metal member such as a steel plate and a plastic member such as a plastic bumper are often used together in the outer plate portion of an automobile body. In addition, in order to measure the vehicle body, attempts have been made to replace the entire steel plate or a part thereof with plastic.
When coating and baking a composite member in which such a metal member and a plastic member are integrally combined, heat resistance may be insufficient depending on the type of the plastic member. Since the appearance quality is deteriorated due to foaming of the film, there is a problem that the intended composite member cannot be prepared.
Therefore, it is generally performed that the metal member and the plastic member are separately coated with a paint and the coating film is baked and cured. As a top coating material for an automobile body steel plate portion, a coating material that is normally cured by baking at around 140 ° C. for 20 to 30 minutes is used. As a plastic member such as FRP, a two-component urethane paint that can be dried at room temperature or at a low temperature of 100 ° C. or lower is generally used.
Conventionally, for example, a colored paint (A) containing a hydroxyl group-containing resin, a melamine resin, and a color pigment is applied to a metal member, and the colored paint (A) is applied to a plastic member. A technique for applying a colored paint (B) in which a polyisocyanate compound is blended with A) has been proposed (see, for example, Patent Document 1).
上記のように、従来の塗装法では、金属部材と、プラスチック部材とを別々に塗装する必要があるため、工程が煩雑化し、余計な工程がかかるなど問題となっている。
プラスチック部材用塗料は、硬化剤としてイソシアネート化合物を使用しており、その分低温で硬化できるものの、メラミン樹脂を用いたものと比べると、仕上がり品質がやや劣り、2液型塗料のため取り扱いも煩雑となる。また、金属部材とプラスチック部材とを別々に塗装し、焼付乾燥するため、各々部材を組み合わせた場合、塗膜の色彩に差が生じることもある。そのため自動車車体の塗装においては、金属部材とプラスチック部材との一体塗装の要望がある。
As described above, in the conventional coating method, since it is necessary to separately coat the metal member and the plastic member, there are problems such as complicated steps and extra steps.
The paint for plastic parts uses an isocyanate compound as a curing agent, which can be cured at a low temperature, but the finished quality is slightly inferior to that using a melamine resin, and handling is complicated due to the two-component paint. It becomes. In addition, since the metal member and the plastic member are separately coated and baked and dried, when the members are combined, there may be a difference in the color of the coating film. Therefore, there is a demand for integral painting of a metal member and a plastic member in painting an automobile body.
本発明は、上記の問題点を解決するため、金属部材と、それに付属するプラスチック製部材とからなる自動車外板の表面に、低温で硬化する上塗り塗料などの塗料組成物を塗装し、該プラスチック製部材が熱変形しない低温で順次焼付乾燥することを特徴とする。 In order to solve the above problems, the present invention applies a coating composition such as a top coating that cures at a low temperature to the surface of an automobile outer plate comprising a metal member and a plastic member attached thereto, and the plastic. It is characterized in that the manufactured member is baked and dried sequentially at a low temperature that is not thermally deformed.
以下、本発明について詳細に説明する。
本発明は、自動車車体の外板部であるボディーなどの金属部材と、それに付属するバンパーなどのプラスチック製部材とが一体的に組み合わされた自動車外板に好適に適用されるものである。例えば、大型バスなどの重量のある商用車の外板鋼板部と、鋼板部の一部をプラスチック化して、鋼板部とプラスチック部とが一体的に取り付けられた自動車外板に適用する場合に、大変に有利である。
なお、ボディーなどの自動車車体の金属部材には、予め、防錆性を付与するために、電着塗膜等のプライマー塗装を施こすことが好適である。
Hereinafter, the present invention will be described in detail.
The present invention is suitably applied to an automobile outer plate in which a metal member such as a body, which is an outer plate portion of an automobile body, and a plastic member such as a bumper attached thereto are integrally combined. For example, when applying to an automobile outer plate in which a steel plate part and a plastic part are integrally attached, by converting a part of the steel plate part of a heavy duty commercial vehicle outer plate steel plate part and the steel plate part into plastic, It is very advantageous.
In addition, it is preferable to apply a primer coating such as an electrodeposition coating to a metal member of an automobile body such as a body in advance in order to impart rust prevention.
金属部材としては、自動車用等の通常の鋼板、ステンレス鋼、アルミニウムなどの金属、及び合金などを加工したものである。
プラスチック製部材としては、ボディー構体の一部をプラスチック化した部位、バンパー、エンジンフード、リッド、フェンダー、ドアー、リアーゲートなどがある。プラスチック製部材の素材としては、一般に、ポリエステル系樹脂や、エポキシ樹脂、を主体としたFRPや、ポリオレフィン、ポリウレタン、ポリカーボネート、ポリフェニレンオキシド、ポリアミド、ABS、及びこれらのポリマーアロイなどがあるが、そのコストや強度などが優れるポリエステル系樹脂が好ましい。ポリエステル系樹脂としては、飽和ポリエステル樹脂、あるいは不飽和ポリエステル樹脂の何れでもよく、また併用してもよい。
これらプラスチック製部材は、塗料の焼付け温度(110℃以下)で熱変形しない素材であることが好ましい。
The metal member is obtained by processing a normal steel plate for automobiles, a metal such as stainless steel or aluminum, and an alloy.
Examples of the plastic member include a plastic body part, a bumper, an engine hood, a lid, a fender, a door, and a rear gate. Generally, plastic materials include FRP mainly composed of polyester resin and epoxy resin, polyolefin, polyurethane, polycarbonate, polyphenylene oxide, polyamide, ABS, and polymer alloys thereof. A polyester resin having excellent strength and strength is preferred. The polyester resin may be either a saturated polyester resin or an unsaturated polyester resin, or may be used in combination.
These plastic members are preferably made of a material that is not thermally deformed at the baking temperature of the paint (110 ° C. or lower).
本発明の塗料は、自動車外板に適用されるものであり、自動車としては、例えば、乗用車や、バス、トラックなどであるが、中でもバスや、トラックなどの商用車が好ましい。
本発明で使用される上塗り塗料は、ポリエステル樹脂20〜50質量%、イミノ基型メラミン樹脂5〜25質量%、及び酸触媒0.01〜2質量%を含み、かつ110℃以下、好ましくは、110〜100℃(通常は、120℃以上でないと、優れた硬化塗膜とはなり難い)で焼付け硬化する塗料である。
The paint of the present invention is applied to an automobile outer plate. Examples of automobiles include passenger cars, buses, and trucks. Among them, commercial vehicles such as buses and trucks are preferable.
The top coating used in the present invention comprises 20 to 50% by weight of a polyester resin, 5 to 25% by weight of an imino group-type melamine resin, and 0.01 to 2% by weight of an acid catalyst, and is 110 ° C. or less, preferably It is a paint that is baked and cured at 110 to 100 ° C. (usually, it is difficult to form an excellent cured coating unless it is 120 ° C. or higher).
上塗り塗料で使用されるポリエステル樹脂としては、各種のポリエステル樹脂を特に制限なく使用することができる。このようなポリエステル樹脂は、例えば、無水フタル酸や、イソフタル酸及びその水素化物、コハク酸、トリメリット酸等の多塩基酸成分と、エチレングリコールや、プロピレングリコール、トリメチロールプロパン、ネオペンチルグリコール等のポリオール成分とを縮合重合させて得られる。天然由来の脂肪酸又は合成脂肪酸で変性したものも含む。ポリエステル樹脂の酸価としては、例えば、5〜20KOHmg/g、好ましくは6〜12KOHmg/gが望ましい。
ここで言うポリエステル樹脂とは、一般的であるオイルフリーアルキド樹脂以外にも、少量の脂肪酸類で変性したオイルレスアルキド樹脂、合成脂肪酸類で変性したアルキド樹脂なども含まれる。ここで言うオイルレスアルキド樹脂は、油長15以下のアルキド樹脂をいい、ポリエステル樹脂の一種である。また、ロジンや、エポキシ、アクリル、シリコン、フッ素等で変性されたポリエステル樹脂も使用できる。
As the polyester resin used in the top coating, various polyester resins can be used without particular limitation. Such polyester resins include, for example, polybasic acid components such as phthalic anhydride, isophthalic acid and its hydride, succinic acid, trimellitic acid, ethylene glycol, propylene glycol, trimethylolpropane, neopentyl glycol, etc. It is obtained by condensation polymerization of the polyol component. It includes those modified with naturally-derived fatty acids or synthetic fatty acids. The acid value of the polyester resin is, for example, 5 to 20 KOH mg / g, preferably 6 to 12 KOH mg / g.
The polyester resin referred to here includes oilless alkyd resins modified with a small amount of fatty acids, alkyd resins modified with synthetic fatty acids, and the like in addition to common oil-free alkyd resins. The oilless alkyd resin mentioned here refers to an alkyd resin having an oil length of 15 or less, and is a kind of polyester resin. In addition, rosin, a polyester resin modified with epoxy, acrylic, silicon, fluorine, or the like can also be used.
上塗り塗料で使用されるイミノ基型メラミン樹脂は、メラミンとホルムアルデヒドとを縮合して得られる生成物を更にアルキルエーテル化して得られる樹脂であり、一部にイミノ基を含有する縮合生成物である。イミノ基型メラミン樹脂は、塗膜の仕上がり品質(つや、肌など)に優れているとともに、酸触媒と組み合わせた時に低温での反応性に優れている。
本発明の上塗り塗料で使用される酸触媒は、低温焼付けに適した上塗り塗料を構成するために配合される触媒である。この酸触媒は、上塗り塗料を焼付けた時に、塗膜の硬化反応を促進する。
The imino group-type melamine resin used in the top coating is a resin obtained by further alkylating a product obtained by condensing melamine and formaldehyde, and is a condensation product partially containing an imino group. . The imino group-type melamine resin is excellent in the finished quality of the coating film (glossy, skin, etc.) and has excellent reactivity at low temperatures when combined with an acid catalyst.
The acid catalyst used in the top coating composition of the present invention is a catalyst formulated to constitute a top coating composition suitable for low temperature baking. This acid catalyst accelerates the curing reaction of the coating film when the top coat is baked.
本発明で使用される酸触媒としては、例えば、p−トルエンスルホン酸や、ドデシルベンゼンスルホン酸、キュメンスルホン酸、ジノニルナフタレンモノスルホン酸、ジノニルナフタレンジスルホン酸などのスルホン酸化合物、リン酸トリメチル、リン酸トリエチル、リン酸モノブチル、リン酸ジブチル、リン酸トリブチル、リン酸トリオクチルなどのリン酸アルキル類、リン酸、ギ酸、酢酸、塩酸などが好適に挙げられる。本発明においては、特に、110℃以下の低温で焼付け硬化できるように、p−トルエンスルホン酸、キュメンスルホン酸、ドデシルベンゼンスルホン酸、ジノニルナフタレンモノスルホン酸、ジノニルナフタレンジスルホン酸、及びアルキルリン酸からなる群から選択される化合物を3種類以上含む酸触媒の混合物であることが好ましい。ただし、これらの酸触媒は、アミン類などの塩基性化合物で、一部あるいは完全に中和されたものであってもよい。 Examples of the acid catalyst used in the present invention include p-toluenesulfonic acid, sulfonic acid compounds such as dodecylbenzenesulfonic acid, cumenesulfonic acid, dinonylnaphthalene monosulfonic acid, dinonylnaphthalenedisulfonic acid, and trimethyl phosphate. Preferable examples include alkyl phosphates such as triethyl phosphate, monobutyl phosphate, dibutyl phosphate, tributyl phosphate and trioctyl phosphate, phosphoric acid, formic acid, acetic acid and hydrochloric acid. In the present invention, in particular, p-toluenesulfonic acid, cumenesulfonic acid, dodecylbenzenesulfonic acid, dinonylnaphthalene monosulfonic acid, dinonylnaphthalenedisulfonic acid, and alkylphosphorus are used so that they can be baked and cured at a low temperature of 110 ° C. or lower. A mixture of acid catalysts containing three or more compounds selected from the group consisting of acids is preferred. However, these acid catalysts may be partially or completely neutralized with basic compounds such as amines.
本発明に用いる上塗り塗料は、ポリエステル樹脂20〜50質量%、好ましくは、22〜40質量%、イミノ基型メラミン樹脂5〜25質量%、好ましくは、8〜16質量%、及び酸触媒0.01〜2質量%、好ましくは、0.3〜1.2質量%を含む。
ポリエステル樹脂が、上塗り塗料の質量に対して、20質量%より少ないと、塗膜外観が悪くなり易い。一方、ポリエステル樹脂が、50質量%を越えると、塗膜の隠蔽性や、硬度が出にくい等の問題が生じ易くなり、好ましくない。
イミノ基型メラミン樹脂が、上塗り塗料の質量に対して、5質量%より少ないと、塗膜が十分に硬化し難い。一方、イミノ基型メラミン樹脂が、25質量%を越えると、塗膜の硬度が高すぎて十分な柔軟性が得られ難いなど、好ましくない。
The top coat used in the present invention is 20 to 50% by mass of polyester resin, preferably 22 to 40% by mass, 5 to 25% by mass of imino group-type melamine resin, preferably 8 to 16% by mass, and 0. 01 to 2% by mass, preferably 0.3 to 1.2% by mass.
When the polyester resin is less than 20% by mass relative to the mass of the top coat, the appearance of the coating film tends to deteriorate. On the other hand, when the amount of the polyester resin exceeds 50% by mass, problems such as concealment of the coating film and difficulty in producing hardness are likely to occur, which is not preferable.
When the imino group type melamine resin is less than 5% by mass with respect to the mass of the top coat, the coating film is hardly cured. On the other hand, when the imino group type melamine resin exceeds 25% by mass, the hardness of the coating film is too high and it is difficult to obtain sufficient flexibility.
酸触媒が、上塗り塗料の重量に対して、0.01質量%より少ないと、塗膜が十分に硬化し難い。一方、酸触媒が2質量%を越えると、塗料の貯蔵安定性が低下したり、塗膜の硬化反応が進み過ぎ塗膜の光沢の低下、耐水性の低下等が起こり、好ましくない。 When the acid catalyst is less than 0.01% by mass with respect to the weight of the top coat, the coating film is hardly cured. On the other hand, when the acid catalyst exceeds 2% by mass, the storage stability of the paint is lowered, the curing reaction of the paint film is excessively advanced, the gloss of the paint film is lowered, the water resistance is lowered, and the like.
本発明の上塗り塗料には、上記で説明した樹脂成分や触媒以外に、溶剤や、必要に応じて、着色顔料、体質顔料等の顔料類、レオロジーコントロール剤、顔料分散剤、表面調整剤、光安定剤、紫外線吸収剤、静電助剤等の各種添加剤などを配合することができる。
溶剤としては、例えば、メタノール、エタノール、プロパノール、イソプロパノール、ブタノールなどのアルコール類、酢酸エチル、酢酸ブチルなどのエステル類、エチレングリコールモノエチルエーテル、エチレングリコールモノブチルエーテルなどのアルコールエーテル類、アセトン、メチルエチルケトンなどのケトン類や、トルエン、キシレン、芳香族炭化水素混合溶剤等の各種塗料用有機溶剤又はその混合物が使用可能である。その配合量は、塗料中0〜80質量%、好ましくは、20〜60質量%が適当である。
顔料としては、二酸化チタン、カーボンブラック、オーカ、ベンガラ、ビスマスバナデート、黄鉛、モリブデートオレンジ、群青、複合酸化物焼成顔料等の無機系着色顔料。また、有機系着色顔料には、フタロシアニン類、アゾ系化合物、キナクリドン、ペリレン、ペリノン、イソインドリノン、イソインドリン、ジオキサジン、アンスラキノン、キノフタロン、ジケトピロロピロール、各種金属錯体等の化合物がある。塗料用体質顔料には、硫酸バリウム、炭酸カルシウム、ベントナイト、シリカ、リトポン等が使用可能である。その配合量は、上塗り塗料中に塗色により、1.5〜50質量%が適当である。
更に、必要に応じて、顔料分散剤や、紫外線吸収剤、光安定剤、レオロジーコントロール剤、静電助剤、表面調整剤、などの各種添加剤を加えても良い。
In addition to the resin component and catalyst described above, the top coating composition of the present invention includes a solvent and, if necessary, pigments such as colored pigments and extender pigments, a rheology control agent, a pigment dispersant, a surface conditioner, light Various additives such as a stabilizer, an ultraviolet absorber, and an electrostatic assistant can be blended.
Examples of the solvent include alcohols such as methanol, ethanol, propanol, isopropanol, and butanol, esters such as ethyl acetate and butyl acetate, alcohol ethers such as ethylene glycol monoethyl ether and ethylene glycol monobutyl ether, acetone, and methyl ethyl ketone. Ketones, various organic solvents for paints such as toluene, xylene, and aromatic hydrocarbon mixed solvents, or mixtures thereof can be used. The blending amount is 0 to 80% by mass, preferably 20 to 60% by mass in the paint.
Examples of the pigment include inorganic color pigments such as titanium dioxide, carbon black, ocher, bengara, bismuth vanadate, chrome lead, molybdate orange, ultramarine, and complex oxide fired pigment. The organic coloring pigments include compounds such as phthalocyanines, azo compounds, quinacridone, perylene, perinone, isoindolinone, isoindoline, dioxazine, anthraquinone, quinophthalone, diketopyrrolopyrrole, and various metal complexes. Barium sulfate, calcium carbonate, bentonite, silica, lithopone and the like can be used as extender pigments for paints. The blending amount is suitably 1.5 to 50% by mass depending on the coating color in the top coat.
Furthermore, you may add various additives, such as a pigment dispersant, a ultraviolet absorber, a light stabilizer, a rheology control agent, an electrostatic adjuvant, and a surface conditioning agent, as needed.
本発明は、上記の上塗り塗料を、自動車用金属部材の一部にプラスチック製部材が一体的に組み合わされた自動車外板に塗装するのに好適である。金属製の車体部分には、予め、防錆性を付与するために、電着塗装等のプライマー塗装及び中塗り塗装を施こすことが望ましい。また、プラスチック製部材の表面には、塗料との密着性を付与するために、エッチングやプライマー塗装などの表面処理が施されていてもよい。
本発明は、上塗り塗料を自動車外板の表面に塗装し、該プラスチック製部材が物性強度低下や、熱変形、発泡等の不具合を起こさない温度で焼付乾燥する。その焼付温度は、基材表面温度で、好ましくは、110〜100℃、また、その焼付時間は、例えば、10〜40分間、好ましくは、20〜30分間であることが好ましい。
塗膜の焼付温度が、例えば、100℃より低いと、塗膜が十分に硬化し難い。一方、110℃を越えると、塗膜は硬化するものの、プラスチック製部材の物性強度低下や、熱変形、発泡等の不具合が起こり易くなり好ましくない。
本発明の塗料の塗装方法は、エアスプレーや、エアレススプレー、静電塗装など、自動車車体に適用される塗装方法であれば、特に限定されず、各種の塗装方法が適用できる。
上塗り塗料の膜厚は、乾燥膜厚で、例えば、15〜60μm、好ましくは、25〜50μmであることが好ましい。
以下、本発明について、実施例により更に詳細に説明するが、これらの実施例は、本発明の範囲を何ら限定するものではない。
なお、実施例中の「部」や「%」は、特に断らない限り、質量基準で示す。
The present invention is suitable for coating the above-mentioned top coat paint on an automobile outer plate in which a plastic member is integrally combined with a part of an automobile metal member. It is desirable to preliminarily apply primer coating such as electrodeposition coating and intermediate coating to the metal body portion in order to impart rust prevention. Further, the surface of the plastic member may be subjected to surface treatment such as etching or primer coating in order to provide adhesion with the paint.
In the present invention, a top coat is applied to the surface of an automobile outer plate, and the plastic member is baked and dried at a temperature that does not cause problems such as deterioration in physical strength, thermal deformation, and foaming. The baking temperature is the substrate surface temperature, preferably 110 to 100 ° C., and the baking time is, for example, 10 to 40 minutes, preferably 20 to 30 minutes.
When the baking temperature of the coating film is lower than 100 ° C., for example, the coating film is not sufficiently cured. On the other hand, when the temperature exceeds 110 ° C., the coating film is cured, but problems such as a decrease in physical strength of the plastic member, thermal deformation, foaming and the like are likely to occur.
The coating method of the present invention is not particularly limited as long as it is a coating method applied to an automobile body such as air spray, airless spray, electrostatic coating, and the like, and various coating methods can be applied.
The film thickness of the top coating is a dry film thickness, for example, 15 to 60 μm, preferably 25 to 50 μm.
EXAMPLES Hereinafter, although an Example demonstrates this invention further in detail, these Examples do not limit the scope of the present invention at all.
In the examples, “parts” and “%” are based on mass unless otherwise specified.
<上塗り塗料の調製>
表1に示す配合で、樹脂、酸触媒、顔料、添加剤等の各成分を混合し、攪拌・練合を行い、最後に酸触媒を添加混合して調製例1〜5及び参考調製例1〜2の上塗り塗料の調製を行った。なお、液状のものは、固形分として記載した。
<Preparation of top coat>
In the formulation shown in Table 1, each component such as resin, acid catalyst, pigment, and additive is mixed, stirred and kneaded, and finally an acid catalyst is added and mixed to Preparation Examples 1 to 5 and Reference Preparation Example 1 A top coat of ~ 2 was prepared. In addition, the liquid thing was described as solid content.
表1
Table 1
表1(続き)
Table 1 (continued)
(注1:合成脂肪酸アルキド樹脂(大日本塗料製、IN−45K−70、不揮発分70%、油長45、酸価8.5KOHmg/g)
(注2:オイルレスアルキド樹脂(大日本塗料製、CIH11−65、不揮発分65%、油長11、酸価10.2KOHmg/g)
(注3:ポリエステル樹脂(大日本塗料製、HI33E−65、不揮発分65%、酸価7.5KOHmg/g)
(注4:メラミン樹脂A(三井東圧製、ユーバン225、不揮発分60%、低温硬化タイプ、ノルマルブチル化メラミン樹脂)
(注5:イミノ基型メラミン樹脂B(三井サイテック製、サイメル207、不揮発分75%、低温硬化タイプ、イミノ基型アルキル化メラミン樹脂)
(注6:メラミン樹脂C(三井東圧製、ユーバン128、不揮発分60%、中温硬化タイプ、ノルマルブチル化メラミン樹脂)
(Note 1: Synthetic fatty acid alkyd resin (Dainippon Paint, IN-45K-70, non-volatile content 70%, oil length 45, acid value 8.5 KOHmg / g)
(Note 2: Oilless alkyd resin (Dai Nippon Paint, CIH11-65, 65% non-volatile content, oil length 11, acid value 10.2 KOHmg / g)
(Note 3: Polyester resin (Dai Nippon Paint, HI33E-65, 65% non-volatile content, acid value 7.5 KOHmg / g)
(Note 4: Melamine resin A (manufactured by Mitsui Toatsu, Yuban 225, nonvolatile content 60%, low temperature curing type, normal butylated melamine resin)
(Note 5: Imino group type melamine resin B (Mitsui Cytec, Cymel 207, non-volatile content 75%, low temperature curing type, imino group type alkylated melamine resin)
(Note 6: Melamine resin C (Mitsui Toatsu, Uban 128, nonvolatile content 60%, medium temperature curing type, normal butylated melamine resin)
(注7:酸化チタン顔料(ルチル型酸化チタン顔料)
(注8:分散剤(酸基を含む共重合物)
(注9:表面調整剤(ビニル系重合物、変性シリコン化合物の混合物)
(注10:レオロジーコントロール剤(尿素系重合物)
(注11:紫外線吸収剤(ベンゾトリアゾール系/ヒンダードアミン系=2/1混合物)
(注12:酸触媒A(テイカ(株)製、リン酸モノブチル)
(注13:酸触媒B(テイカ(株)製、p−トルエンスルホン酸)
(Note 7: Titanium oxide pigment (rutile titanium oxide pigment)
(Note 8: Dispersant (copolymer containing acid group)
(Note 9: Surface conditioner (mixture of vinyl polymer and modified silicon compound)
(Note 10: Rheology control agent (urea polymer)
(Note 11: UV absorber (benzotriazole type / hindered amine type = 2/1 mixture)
(Note 12: Acid catalyst A (manufactured by Teika Co., Ltd., monobutyl phosphate)
(Note 13: Acid catalyst B (Taika Corporation, p-toluenesulfonic acid)
(注14:酸触媒C(テイカ(株)製、キュメンスルホン酸)
(注15:酸触媒D(テイカ(株)製、ドデシルベンゼンスルホン酸)
(注16:アクリタンスーパー3000 ホワイト(大日本塗料製、アクリルポリイソシアネート2液型エナメル塗料)
(Note 14: Acid catalyst C (manufactured by Teika), cumene sulfonic acid)
(Note 15: Acid catalyst D (manufactured by Teika Co., Ltd., dodecylbenzenesulfonic acid)
(Note 16: Acrytan Super 3000 White (Dainippon Paint, acrylic polyisocyanate 2-pack enamel)
<試験板>
ダル鋼板(0.8mm×70mm×150mm)に、所定の工程でカチオン電着塗装を施した試験板(日本テストパネル社製)を、金属部材とした。以下、電着鋼板と言う。
ビニルエステル系ゲルコートを施した不飽和ポリエステルFRP板(中部工業製)を、1mm×70mm×150mmに切断し、プラスチック部材とした。以下、FRP板と言う。
<Test plate>
A test plate (manufactured by Nippon Test Panel Co., Ltd.) obtained by applying cationic electrodeposition coating to a dull steel plate (0.8 mm × 70 mm × 150 mm) in a predetermined process was used as a metal member. Hereinafter, it is referred to as an electrodeposited steel sheet.
An unsaturated polyester FRP plate (manufactured by Chubu Kogyo Co., Ltd.) coated with a vinyl ester gel coat was cut into 1 mm × 70 mm × 150 mm to obtain a plastic member. Hereinafter, it is referred to as an FRP plate.
<試験板の作製>
上記電着鋼板とFRP板の表面を、石油ベンジンを含ませたガーゼで拭き脱脂処理とした。この電着鋼板とFRP板を、それぞれ一体的に組み合わせ、外板用試験板とした。
これに塗装に適した粘度に希釈した中塗り塗料(大日本塗料製、デリコン中塗SF110ホワイト:ポリエステル/メラミン系塗料)を30〜35μm(乾燥膜厚)になるようにスプレー塗装し、温度110℃で20分間焼付乾燥した後、室温まで冷却した。
次いで、上記のように調製した上塗り塗料を塗装に適した粘度に希釈し、各々35〜40μm(乾燥膜厚)スプレー塗装し、実施例1〜5の塗料は温度110℃で20分間、比較例1の塗料は120℃で20分間、比較例2の塗料は140℃で20分間、比較例3の塗料は80℃で30分間、それぞれ焼付乾燥した後、室温に冷却し、試験板を作製した。
上記で作製した塗料の塗膜の評価は、以下のように行った。
<Preparation of test plate>
The surfaces of the electrodeposited steel plate and the FRP plate were wiped with gauze containing petroleum benzine for degreasing. The electrodeposited steel plate and the FRP plate were integrally combined to form an outer plate test plate.
This was spray-coated with an intermediate coating diluted to a viscosity suitable for coating (Daikon Paint, Delicon intermediate coating SF110 white: polyester / melamine-based coating) to a thickness of 30 to 35 μm (dry film thickness), temperature 110 ° C. And baked and dried for 20 minutes, and then cooled to room temperature.
Next, the top coating material prepared as described above was diluted to a viscosity suitable for coating, and spray coating was performed at 35 to 40 μm (dry film thickness), and the coating materials of Examples 1 to 5 were compared at a temperature of 110 ° C. for 20 minutes. The paint of No. 1 was baked and dried at 120 ° C. for 20 minutes, the paint of Comparative Example 2 at 140 ° C. for 20 minutes, and the paint of Comparative Example 3 at 80 ° C. for 30 minutes, and then cooled to room temperature to prepare a test plate. .
Evaluation of the coating film of the coating material produced above was performed as follows.
<塗膜外観>
上記で作製した塗板の塗膜外観を、光沢計を用いて60°光沢値を測定し、以下のように評価した。
○…92以上
△…92未満〜88以上
×…88未満
<Appearance of coating film>
The coating film appearance of the coated plate prepared above was evaluated by measuring the 60 ° gloss value using a gloss meter as follows.
○… 92 or more Δ… less than 92 to 88 or more ×… less than 88
<ペーパー目試験>
中塗り塗料を塗装後、乾燥させ、回転サンダー#320番で塗膜表面を研磨した後、上塗り塗料で塗装後、乾燥させて塗膜の表面を、以下のように目視評価した。
〇…研ぎ跡が見られない
△…わずかに見られる
×…はっきりと見られる
<Paper eye test>
After applying the intermediate coating, it was dried, and the surface of the coating film was polished with a rotating sander # 320, and then coated with a top coating, and then dried, and the surface of the coating was visually evaluated as follows.
〇… Sharp marks are not seen △… Slightly seen ×… Clearly seen
<ダスト抵抗性>
上塗り塗料を塗装10分後に、塗料ダストを表面から掛けて、塗膜表面の荒れ具合を、以下のように目視評価した。
〇…良好
△…わずかに肌荒れが見られる
×…明らかな肌荒れが見られる
<Dust resistance>
Ten minutes after the top coating was applied, paint dust was applied from the surface, and the roughness of the coating film surface was visually evaluated as follows.
○… Good △… Slightly rough skin is seen ×… Clear skin rough is seen
<塗膜硬度>
上記で作製した塗板を用いて、JIS K5600−5−4に従い、三菱ハイユニ鉛筆を用いて塗膜表面を引っかき、塗膜に傷が生じなかった最も堅い鉛筆硬度で、以下のように評価した。
〇…F以上
△…HB
×…B以下
<Coating hardness>
Using the coated plate prepared above, according to JIS K5600-5-4, the surface of the coating film was scratched using a Mitsubishi Hi-Uni pencil, and the hardness was evaluated as follows with the hardest pencil hardness at which the coating film was not damaged.
○… F or more △… HB
× ... B or less
<耐溶剤性>
上記で作製した塗板を用いて、室温において、塗膜表面をキシレンで湿らせたガーゼで往復10回ラビングテストを繰り返した後、塗膜表面の状態を、以下のように目視評価した。
〇…異常なし
△…わずかに艶引け
×…完全に艶引け
<層間付着性>
同一上塗り塗料で1回目の塗装し、前記試験板作製条件の規定温度/時間の焼付を4回繰り返し行った後、その上に同一塗料で2回目の上塗り塗装し、前記規定温度/時間で1回焼付け乾燥して試験板を作製した。その試験板にJIS K5600−5−6に従い、2mm巾ゴバン目付着テストを行い、その塗膜表面をセロテープ(登録商標)ではがした際に、はがれなかったゴバン目の数に応じて、以下のように評価した。
〇…100/100
×…99/100以下
<Solvent resistance>
Using the coated plate prepared above, the rubbing test was repeated 10 times with gauze where the surface of the coating film was moistened with xylene at room temperature, and then the state of the coating film surface was visually evaluated as follows.
○… No abnormality △… Slightly glossy ×… Completely glossy <Interlayer adhesion>
After the first coating with the same top coating and the baking at the specified temperature / time specified in the test plate preparation conditions was repeated four times, the second top coating was applied with the same coating on the test plate, and 1 at the specified temperature / time. Test plates were prepared by baking and drying. According to JIS K5600-5-6, the test plate was subjected to a 2 mm wide gobang eye adhesion test, and when the surface of the coating film was peeled off with cello tape (registered trademark), depending on the number of gobang eyes, the following: It was evaluated as follows.
○ ... 100/100
× ... 99/100 or less
上記の塗膜評価方法に従い、塗膜を評価した結果を、以下の表2に示す。 The results of evaluating the coating film according to the above-described coating film evaluation method are shown in Table 2 below.
表2
Table 2
表2(続き)
Table 2 (continued)
本発明により、鋼板部とプラスチック製部材とを一体的に有する自動車車体の塗装において、鋼板部とプラスチック製部材との両方の表面に、上塗り塗料の塗装及び焼付乾燥を一体的に同時に行うことができ、また、その塗膜は、仕上がり外観や硬度、耐溶剤性、層間付着性などに優れていた。このように、メラミン樹脂タイプの焼付塗料においても、低温焼付が可能となり、ウレタン樹脂系タイプの塗装より優れた仕上がり感の塗膜が得られる。同時に、鋼板やプラスチックなどの素材の異なる一体化した部材にも、塗装・焼付乾燥が同時にできるため、工程短縮が可能になり、更に部材間の微妙な色違いなども無くなる。今後多色デザイン塗装なども可能になり、意匠性に優れた自動車車体の塗装への応用が期待される。 According to the present invention, in the coating of an automobile body integrally having a steel plate portion and a plastic member, it is possible to simultaneously and simultaneously apply a top coat paint and bake drying on both surfaces of the steel plate portion and the plastic member. The coating film was excellent in finished appearance, hardness, solvent resistance, interlayer adhesion, and the like. Thus, even melamine resin type baking paints can be baked at a low temperature, and a coating film having a finished feeling superior to urethane resin type coatings can be obtained. At the same time, integrated members with different materials, such as steel plates and plastics, can be painted and baked and dried at the same time, which makes it possible to shorten the process and eliminate subtle color differences between the members. In the future, multicolor design painting will be possible, and it is expected to be applied to the painting of automobile bodies with excellent design.
Claims (7)
ポリエステル樹脂20〜50質量%、イミノ基型メラミン樹脂5〜25質量%、及び酸触媒0.01〜2質量%を含み、かつ110℃以下で焼付け硬化する上塗り塗料を塗装し、該温度で焼付乾燥することを特徴とする自動車外板の塗装方法。 A method of painting a surface of an automobile outer plate in which a metal member and a plastic member are integrally combined,
A top coat containing 20-50% by mass of a polyester resin, 5-25% by mass of an imino group-type melamine resin, and 0.01-2% by mass of an acid catalyst and baked and cured at 110 ° C. or less is applied and baked at the temperature. A method of painting an automobile outer plate characterized by drying.
ポリエステル樹脂20〜50質量%、イミノ基型メラミン樹脂5〜25質量%、及び酸触媒0.01〜2質量%を含み、かつ110℃以下で焼付け硬化することを特徴とする塗料組成物。 A coating composition for an automobile outer plate surface in which a metal member and a plastic member are integrally combined,
A coating composition comprising 20 to 50% by mass of a polyester resin, 5 to 25% by mass of an imino group-type melamine resin, and 0.01 to 2% by mass of an acid catalyst, and is baked and cured at 110 ° C. or less.
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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