JPWO2013141305A1 - 複層塗膜形成方法 - Google Patents
複層塗膜形成方法 Download PDFInfo
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- JPWO2013141305A1 JPWO2013141305A1 JP2014506272A JP2014506272A JPWO2013141305A1 JP WO2013141305 A1 JPWO2013141305 A1 JP WO2013141305A1 JP 2014506272 A JP2014506272 A JP 2014506272A JP 2014506272 A JP2014506272 A JP 2014506272A JP WO2013141305 A1 JPWO2013141305 A1 JP WO2013141305A1
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- coating film
- water
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- base
- uncured
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- 150000005846 sugar alcohols Polymers 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000003784 tall oil Substances 0.000 description 1
- 125000000999 tert-butyl group Chemical group [H]C([H])([H])C(*)(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- YBRBMKDOPFTVDT-UHFFFAOYSA-N tert-butylamine Chemical compound CC(C)(C)N YBRBMKDOPFTVDT-UHFFFAOYSA-N 0.000 description 1
- AUHHYELHRWCWEZ-UHFFFAOYSA-N tetrachlorophthalic anhydride Chemical compound ClC1=C(Cl)C(Cl)=C2C(=O)OC(=O)C2=C1Cl AUHHYELHRWCWEZ-UHFFFAOYSA-N 0.000 description 1
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 1
- 229910052718 tin Inorganic materials 0.000 description 1
- 239000011135 tin Substances 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 1
- 125000005270 trialkylamine group Chemical group 0.000 description 1
- IMFACGCPASFAPR-UHFFFAOYSA-N tributylamine Chemical compound CCCCN(CCCC)CCCC IMFACGCPASFAPR-UHFFFAOYSA-N 0.000 description 1
- BJAARRARQJZURR-UHFFFAOYSA-N trimethylazanium;hydroxide Chemical compound O.CN(C)C BJAARRARQJZURR-UHFFFAOYSA-N 0.000 description 1
- QXJQHYBHAIHNGG-UHFFFAOYSA-N trimethylolethane Chemical compound OCC(C)(CO)CO QXJQHYBHAIHNGG-UHFFFAOYSA-N 0.000 description 1
- 239000002383 tung oil Substances 0.000 description 1
- 229940005605 valeric acid Drugs 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
- 239000003981 vehicle Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 238000013191 viscoelastic testing Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000011701 zinc Substances 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- LRXTYHSAJDENHV-UHFFFAOYSA-H zinc phosphate Chemical compound [Zn+2].[Zn+2].[Zn+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O LRXTYHSAJDENHV-UHFFFAOYSA-H 0.000 description 1
- 229910000165 zinc phosphate Inorganic materials 0.000 description 1
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Abstract
Description
例えば、特許文献1には、特定の不飽和モノマーから生成したアクリル系エマルション樹脂、水酸基含有樹脂、硬化剤および特定の固形分含量の着色顔料を含む水性中塗り塗料組成物が開示されている。
また、特許文献2には、鋼板上に形成された電着塗膜上に、塗膜物性値を限定した耐チッピング塗料、中塗り塗料、ベースコート塗料およびクリヤーコート塗料を順次塗り重ねて複層塗膜を形成する塗膜形成方法が開示されている。
しかしながら、特許文献1の組成物では、耐チッピング性に有効なウレタン結合のような凝集力が強い結合基が樹脂骨格内に存在しないために、中塗り塗膜での耐チッピング性が不充分であった。また、スリーウェット塗装方法では最低溶融粘度が低いために、加熱硬化時の中塗り塗料とベース塗料との混層制御が不充分であり、ツーコート・ワンベーク塗装方法よりも外観が低下するという問題があった。
また、特許文献2の塗膜形成方法では、中塗り塗膜に扁平顔料が含まれ、石などが衝突した際の衝撃緩和を塗膜水平方向に分散させるため、鋼板と電着塗膜との界面や電着塗膜と中塗り塗膜との界面の剥離は抑制できるが、中塗り塗膜での塗膜水平方向の剥離する面積が増大し、車体の外観を損なうという問題があった。
すなわち、本発明は、
[1] 電着塗膜を備えた自動車車体上に、第1水性ベース塗料を乾燥塗膜が10〜40μmとなるように塗装して未硬化の第1ベース塗膜を形成する工程(1);
上記工程(1)で得られた未硬化の第1ベース塗膜上に第2水性ベース塗料を乾燥塗膜が5〜30μmとなるように塗装して未硬化の第2ベース塗膜を形成する工程(2);
工程(1)および(2)で得られた未硬化の第1ベース塗膜および未硬化の第2ベース塗膜を加熱乾燥させた後に、クリヤー塗料を乾燥塗膜が10〜70μmとなるように塗装して未硬化のクリヤー塗膜を形成する工程(3);ついで
工程(1)、(2)および(3)で得られた未硬化の第1ベース塗膜、未硬化の第2ベース塗膜および未硬化のクリヤー塗膜を同時に加熱硬化させて第1ベース塗膜、第2ベース塗膜およびクリヤー塗膜からなる複層塗膜を形成する工程(4)を含む、複層塗膜形成方法において、
第1ベース塗膜単膜の乾燥膜厚が25μm、第2ベース塗膜単膜の乾燥膜厚が10μm、および、クリヤー塗膜単膜の乾燥膜厚が30μmである複層塗膜の、20℃における伸び率が40〜60%であり、抗張力が400〜600kgf/m2であり、−20℃における弾性項に対する粘性項の比(tanδ)が0.04〜0.06であることを特徴とする複層塗膜形成方法;
[4] ポリカーボネートジオール(a2−1)が重量平均分子量1,500〜5,000を有する[3]に記載の複層塗膜形成方法;
を提供する。
このうち、水分散型ポリウレタン組成物(A)は、ジイソシアネートを必須成分とし、他のポリイソシアネートを任意成分として含んでいてもよいポリイソシアネート成分(a1)、重量平均分子量1,500〜5,000のポリカーボネートジオール(a2−1)とカルボキシル基含有ジオール(a2−2)とを必須成分とし、他のポリオールを任意成分として含んでいてもよいポリオール成分(a2)、モノアミン化合物を必須成分とし、ジアミン化合物を任意成分として含んでいてもよいアミン成分(a3)、カルボキシル基中和成分(a4)、および水(a5)から得られる。
また、水酸基価についても、特に限定されるものではなく、任意の値を選択することができ、通常0〜100mgKOH/gである。
また、モノマー混合物は、カルボニル基含有エチレン性不飽和モノマー、加水分解重合性シリル基含有モノマー、種々の多官能ビニルモノマーなどの架橋性モノマーを含んでいてもよい。その場合、得られる水分散型アクリル樹脂エマルションは自己架橋性となる。
硬化剤(C)としては、水分散型ポリウレタン組成物(A)および水分散型アクリル樹脂(B)のどちらか一方、または両方と硬化反応を生じ、第1水性ベース塗料に配合できるものであれば特に限定されるものではないが、例えば、アミノ樹脂および/またはブロックイソシアネート樹脂が特に好ましく用いられる。
1,6−ヘキサンジオールから得られる重量平均分子量2,000のポリカーボネートジオール0.26モル部、イソホロンジイソシアネート1.0モル部、ジメチロールプロピオン酸0.36モル部、これらの全質量の39質量%のN−メチル−2−ピロリドンを反応フラスコに仕込み、窒素気流下で、125℃で2時間反応させプレポリマーを得た。シリコーン系消泡剤SE−21(商品名、ワッカーシリコン社製)0.25g、トリエチルアミン22.0g、エチレンジアミン0.315g、モノエタノールアミン5.35gを溶解した600gの水に、上記で得られたプレポリマー500gを15分で滴下した。IR測定でイソシアネート基由来の吸収が消失するまで40℃で撹拌して、固形分31.5%の水分散型ポリウレタン組成物Aを得た。これに分散しているポリウレタン組成物の数平均分子量をGPC法によるポリスチレン標準で測定したところ、30,000であった。
1,6−ヘキサンジオールから得られる重量平均分子量2,000のポリカーボネートジオール0.13モル部、イソホロンジイソシアネート1.0モル部、ジメチロールプロピオン酸0.36モル部、これらの全質量の40質量%のN−メチル−2−ピロリドンを反応フラスコに仕込み、窒素気流下で、125℃で2時間反応させ、プレポリマーを得た。上記シリコーン系消泡剤SE−21を0.25g、トリエチルアミン31.0g、エチレンジアミン0.315g、モノエタノールアミン5.35gを溶解した600gの水に、上記で得られたプレポリマー500gを15分で滴下した。さらにIR測定でイソシアネート基由来の吸収が消失するまで40℃で30分撹拌して、固形分32.0%の水分散型ポリウレタン組成物Bを得た。これに分散しているポリウレタン組成物の数平均分子量を上記製造例1と同様に測定したところ、22,000であった。
1,6−ヘキサンジオールから得られる重量平均分子量1,000のポリカーボネートジオール0.26モル部、イソホロンジイソシアネート1.0モル部、ジメチロールプロピオン酸0.36モル部、これらの全質量の40質量%のN−メチル−2−ピロリドンを反応フラスコに仕込み、窒素気流下で、125℃で2時間反応させ、プレポリマーを得た。上記シリコーン系消泡剤SE−21を0.25g、トリエチルアミン22.0g、エチレンジアミン0.315g、モノエタノールアミン5.35gを溶解した600gの水に、上記で得られたプレポリマー500gを15分で滴下した。さらにIR測定でイソシアネート基由来の吸収が消失するまで、40℃で30分撹拌して、固形分31.7%の水分散型ポリウレタン組成物Cを得た。これに分散しているポリウレタン組成物の数平均分子量を上記製造例1と同様に測定したところ、17,000であった。
1,6−ヘキサンジオールから得られる重量平均分子量1,000のポリカーボネートジオール0.26モル部、ジシクロヘキシルメタン−4,4’−ジイソシアネート1.0モル部、ジメチロールプロピオン酸0.36モル部、これらの全質量の40質量%のN−メチル−2−ピロリドンを反応フラスコに仕込み、窒素気流下で、125℃で2時間反応させ、プレポリマーを得た。上記シリコーン系消泡剤SE−21を0.25g、トリエチルアミン22.00g、エチレンジアミン0.315g、モノエタノールアミン5.35gを溶解した600gの水に、上記で得られたプレポリマー500gを15分で滴下した。さらにIR測定でイソシアネート基由来の吸収が消失するまで、40℃で30分撹拌して、固形分31.7%の水分散型ポリウレタン組成物Dを得た。これに分散しているポリウレタン組成物の数平均分子量を上記製造例1と同様に測定したところ、15,000であった。
攪拌機、温度計、滴下ロート、還流冷却器および窒素導入管などを備えた通常のアクリル系樹脂エマルション製造用の反応容器に、水445部およびニューコール293(日本乳化剤社製アニオン系乳化剤)5部を仕込み、攪拌しながら75℃に昇温した。メタクリル酸メチル45部、アクリル酸ブチル299部、スチレン50部、アクリル酸2−ヒドロキシエチル92部、メタクリル酸14部およびエチレングリコールジメタクリレート20部からなるモノマー混合物(樹脂の酸価:18mgKOH/g、水酸基価:85mgKOH/g、Tg:−22℃)、水240部およびニューコール293 30部の混合物を、ホモジナイザーを用いて乳化し、そのモノマープレ乳化液を上記反応容器中に3時間にわたって攪拌しながら滴下した。モノマープレ乳化液の滴下と併行して、重合開始剤として過硫酸アンモニウム1部を水50部に溶解した水溶液を、上記反応容器中に上記モノマープレ乳化液の滴下終了時まで均等に滴下した。モノマープレ乳化液の滴下終了後、さらに80℃で1時間反応を継続し、その後、冷却した。冷却後、ジメチルアミノエタノール2部を水20部に溶解した水溶液を投入し、不揮発分40.6質量%の水分散型アクリル樹脂を得た。
反応容器にエチレングリコールモノメチルエーテル76部を仕込み、スチレン45部、メチルメタクリレート63部、2−ヒドロキシエチルメタクリレート48部、n−ブチルアクリレート117部、メタクリル酸27部およびアゾビスイソブチロニトリル3部からなるモノマー混合物のうち60部を加えて撹拌下、温度を120℃にした。120℃になると同時に上記モノマー混合液243部を3時間で等速滴下し、さらにその温度で1時間反応させて酸価が58mgKOH/g、水酸基価が70mgKOH/g、数平均分子量が10,000のアクリル樹脂を得た。これをジメチルエタノールアミンで中和して中和率80%、不揮発分50質量%の水溶性アクリル樹脂を得た。
エチレングリコール20.51部、トリメチロールプロパン12.91部、および無水フタル酸51.70部を加え、160〜220℃で5時間エステル化反応させた後、さらに無水トリメリット酸14.88部を加えて180℃で1時間反応させて酸価が50mgKOH/g、水酸基価が60mgKOH/g、数平均分子量2,000のポリエステル樹脂を得た。これをジメチルエタノールアミンで中和して中和率80%、不揮発分35質量%の水溶性ポリエステル樹脂を得た。
第1水性ベース塗料の製造例
水分散型ポリウレタン組成物(A)28.3部(固形分8.9部)、水分散型アクリル樹脂4.9部(固形分2.0部)、水溶性アクリル樹脂10.6部(固形分5.3部)および水溶性ポリエステル樹脂15.1部(固形分5.3部)に、硬化剤としてサイメル327(商品名、日本サイテックインダストリーズ社製メラミン樹脂)8.4部(固形分7.6部)を混合した後、アデカノールUH814(商品名、ADEKA社製ウレタン会合型増粘剤)を混合攪拌し、水分散型ポリウレタン組成物(A)を塗料樹脂固形分100部に対して固形分として30部含まれる第1水性ベース塗料を得た。
但し顔料としては、塗料樹脂固形分合計100部に対してルチル型酸化チタン27部、硫酸バリウム48部およびカーボンブラック9部を配合した。
尚、これらの顔料は、予め水溶性アクリル樹脂と脱イオン水、消泡剤を加え、予備混合を行った後、ペイントコンディショナーにてガラスビーズ媒体中で分散処理した。
アクアレックスAR−2100NH−730(商品名、日本ペイント社製水性ソリッドベース塗料)と水分散型ポリウレタン組成物(A)をアクアレックスAR−2100NH−730の樹脂固形分100部に対して固形分が30部となるように混合攪拌し、第2水性ベース塗料を得た。
リン酸亜鉛処理したダル鋼板に、パワーニクス150(商品名、日本ペイント社製カチオン電着塗料)を、乾燥塗膜が20μmとなるように電着塗装し、160℃で30分間の加熱硬化後冷却して、鋼板基板を準備した。
また、鋼板基板に代えてポリプロピレン製試験板を使用し、かつ、回転霧化式静電塗装装置に代えてエアースプレーを用いたこと以外、同様にして複層塗膜を形成した。その後、複層塗膜をポリプロピレン製試験板から10×70mmの大きさに切断して取り出した応力歪特性用試験片と、5×20mmの大きさに切断して取り出した粘弾性用試験片を作製した。
応力歪特性
<伸び率・抗張力>
作製した応力歪特性用試験片を、オートグラフAGS−G型およびアナログメーター(島津製作所社製)を用いて、測定長さ50mm、温度20℃、引っ張り速度10mm/minで測定を行った。抗張力は、引っ張り試験直後のグラフの傾きより得た。また、伸び率は、グラフから読み取った試験片の伸び〔試験前の試験片の軸方向の長さを50(mm)、試験片が破断するまでの軸方向の長さL(mm)とする場合に、伸び率(%)=(L−50)×100/50〕より得た。
作製した粘弾性用試験片を、強制伸縮振動型粘弾性測定装置(オリエンテック社製、商品名「バイブロン」)を用いて、昇温時に発生する応力と振動ひずみの間に生じる位相差から−20℃のtanδを求めた。なお、測定周波数は11Hz、昇温速度は2℃/分とした。
グラベロテスター試験機(スガ試験機社製)を用いて、7号砕石50gを35cmの距離から2kgf/cm2の空気圧で、上記試験片の複層塗膜に90°の角度で衝突させた。水洗乾燥後、ニチバン社製工業用ガムテープを用いて剥離した
塗膜片を除去し、その後、塗膜のはがれの程度を目視により評価した。その後、塩水噴霧試験を行い、傷が鋼板にまで達している際に発生する錆の状態を目視にて評価した。塗膜のはがれおよび錆の状態は以下の評価基準にて評価した。結果を表1に示した。
1 ほとんどない
2 わずかにあるが外観上問題ないレベル
3 やや大きく、または、やや多く、かつ、外観上問題のあるレベル
4 大きい、または、多い
5 著しく大きい、または、著しく多い
上記のようにして得た複層塗膜を形成した試験片を、40℃の温水に10日間浸漬した後に取り出して、試験片の塗膜の膨潤によって生じる塗膜表面のチヂミ現象を目視で評価した。チヂミ現象が生じなかった試験片を○と評価し、生じた試験片を×と評価し、結果を表1に示した。
複層塗膜を形成した試験片に1滴のキシレン(0.1〜0.3cc)を落とし、室温にて30分間放置した後に拭き取り、塗膜の部位の膨潤および膨潤によって生じる塗膜表面のチヂミ現象を目視で評価した。膨潤やチヂミ現象が生じなかった試験片を○と評価し、生じた試験片を×と評価し、結果を表1に示した。
表1に記載のとおり、水分散型ポリウレタン組成物(A)を、塗料樹脂固形分100部に対して固形分として各々所定量含まれる第1水性ベース塗料および第2水性ベース塗料を、実施例1と同様にして得た。
さらに、実施例1と同様にして、複層塗膜の形成された試験片を得た後、各種評価試験を実施した。結果を表1に示した。なお、実施例2〜5および比較例7のクリヤー塗料としては、O−100に代えて、マックフローO−1900(商品名、日本ペイント社製、酸エポキシ硬化型クリヤー塗料)を用いた。
Claims (5)
- 電着塗膜を備えた自動車車体上に、第1水性ベース塗料を乾燥塗膜が10〜40μmとなるように塗装して未硬化の第1ベース塗膜を形成する工程(1);
上記工程(1)で得られた未硬化の第1ベース塗膜上に第2水性ベース塗料を乾燥塗膜が5〜30μmとなるように塗装して未硬化の第2ベース塗膜を形成する工程(2);
工程(1)および(2)で得られた未硬化の第1ベース塗膜および未硬化の第2ベース塗膜を加熱乾燥させた後に、クリヤー塗料を乾燥塗膜が10〜70μmとなるように塗装して未硬化のクリヤー塗膜を形成する工程(3);ついで
工程(1)、(2)および(3)で得られた未硬化の第1ベース塗膜、未硬化の第2ベース塗膜および未硬化のクリヤー塗膜を同時に加熱硬化させて第1ベース塗膜、第2ベース塗膜およびクリヤー塗膜からなる複層塗膜を形成する工程(4)を含む、複層塗膜形成方法において、
第1ベース塗膜単膜の乾燥膜厚が25μm、第2ベース塗膜単膜の乾燥膜厚が10μm、および、クリヤー塗膜単膜の乾燥膜厚が30μmである複層塗膜の、20℃における伸び率が40〜60%であり、抗張力が400〜600kgf/m2であり、−20℃における弾性項に対する粘性項の比(tanδ)が0.04〜0.06であることを特徴とする複層塗膜形成方法。 - 前記第1水性ベース塗料が、ポリイソシアネート成分(a1)、ポリオール(a2)、アミン成分(a3)、カルボキシル基中和成分(a4)および水(a5)から得られる水分散型ポリウレタン組成物(A)を含む請求項1に記載の複層塗膜形成方法。
- 前記ポリオール(a2)がポリカーボネートジオール(a2−1)およびカルボキシル基含有ジオール(a2−2)を含んでいる請求項2に記載の複層塗膜形成方法。
- ポリカーボネートジオール(a2−1)が重量平均分子量1,500〜5,000を有する請求項3に記載の複層塗膜形成方法。
- 水分散型ポリウレタン組成物が、1:0.8〜1:2のモル比であるポリカーボネートジオール(a2−1)とカルボキシル基含有ジオール(a2−2)とを含む請求項3または4に記載の複層塗膜形成方法。
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JP2013535311A (ja) * | 2010-07-02 | 2013-09-12 | 関西ペイント株式会社 | 複層塗膜形成方法 |
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CA2867309A1 (en) | 2013-09-26 |
JP6208120B2 (ja) | 2017-10-04 |
MX362200B (es) | 2019-01-08 |
US20150079293A1 (en) | 2015-03-19 |
WO2013141305A1 (ja) | 2013-09-26 |
MX2014011319A (es) | 2014-10-17 |
CN104411415A (zh) | 2015-03-11 |
CA2867309C (en) | 2020-05-12 |
US9393592B2 (en) | 2016-07-19 |
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