JP2005000905A - プラスチック基材の塗膜形成方法 - Google Patents
プラスチック基材の塗膜形成方法 Download PDFInfo
- Publication number
- JP2005000905A JP2005000905A JP2003369103A JP2003369103A JP2005000905A JP 2005000905 A JP2005000905 A JP 2005000905A JP 2003369103 A JP2003369103 A JP 2003369103A JP 2003369103 A JP2003369103 A JP 2003369103A JP 2005000905 A JP2005000905 A JP 2005000905A
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- Prior art keywords
- coating film
- coating
- paint
- film
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Abstract
【解決手段】(1)プラスチック基材に、明度(L*値)80以上の塗膜が得られる、水分含有量15〜48重量%の水性白色プライマー塗料(A)を塗装する工程、(2)この塗装塗膜を予備加熱して、塗膜の水分含有量を1〜10重量%に、且つ塗膜の表面電気抵抗値を109Ω/□未満に調整する工程、(3)この調整塗膜上に、熱硬化性透明着色塗料(B)を静電塗装する工程、(4)該塗料(B)の未硬化塗膜上に、熱硬化性クリヤ塗料(C)を静電塗装する工程、次いで(5)これらの三層塗膜を同時に焼き付けて、明度(N値)8.5以上の複層塗膜を得る工程、を含むプラスチック基材の塗膜形成方法。
【選択図】なし。
Description
(2)該プライマー塗料(A)の上記塗装塗膜を、予備加熱して、塗膜中の水分含有量を1〜10重量%の範囲内に、且つ、塗膜の表面電気抵抗値を109Ω/□未満に調整する工程、
(3)該プライマー塗料(A)の上記調整塗膜上に、熱硬化性透明着色塗料(B)を静電塗装する工程、
(4)該着色塗料(B)の未硬化塗膜上に、熱硬化性クリヤ塗料(C)を静電塗装する工程、次いで
(5)上記の塗料(A)、(B)及び(C)からなる三層塗膜を同時に焼き付けて、JIS Z 8721に規定されるマンセル表色系に基づく明度(N値)が8.5以上を有する複層塗膜を得る工程、を含むことを特徴とするプラスチック基材の塗膜形成方法。
本発明方法におけるプラスチック基材としては、特に限定されないが、例えば、バンパー、スポイラー、グリル、フェンダーなどの自動車外板部や、家庭電化製品の外板部などに使用される各種プラスチック部材などが挙げられる。
水性白色プライマー塗料(A)は、プラスチック基材に、直接塗装される塗料であり、JIS Z 8729に規定されるL*a*b*表色系に基づく明度(L*値)として80以上という白色度が高い塗膜を形成できる塗料である。
熱硬化性透明着色塗料(B)としては、上塗りベースコート用の着色塗料としてそれ自体公知の塗料をいずれも使用でき、例えば、カルボキシル基、水酸基などの架橋性官能基を有する、アクリル樹脂、ポリエステル樹脂、アルキド樹脂、ウレタン樹脂、エポキシ樹脂などの基体樹脂;ポリイソシアネート化合物、ブロック化ポリイソシアネート化合物、メラミン樹脂、尿素樹脂などの架橋剤;及び着色顔料を、水及び/又は有機溶剤に溶解ないし分散させて塗料化したものを、好適に使用できる。
熱硬化性クリヤ塗料(C)としては、上塗りクリヤコート用の塗料としてそれ自体公知の塗料をいずれも使用でき、例えば、カルボキシル基、水酸基などの架橋性官能基を有する、アクリル樹脂、ポリエステル樹脂、アルキド樹脂、ウレタン樹脂、エポキシ樹脂などの基体樹脂と、ポリイソシアネート化合物、ブロック化ポリイソシアネート化合物、メラミン樹脂、尿素樹脂などの架橋剤とを、水及び/又は有機溶剤に溶解ないし分散させて塗料化したものを、好適に使用できる。
本発明の塗膜形成方法は、下記工程(1)〜(5)を含んでいる。
(2)該プライマー塗料(A)の上記塗装塗膜を、予備加熱して、塗膜中の水分含有量を1〜10重量%の範囲内に、且つ、塗膜の表面電気抵抗値を109Ω/□未満に調整する工程、
(3)該プライマー塗料(A)の上記調整塗膜上に、熱硬化性透明着色塗料(B)を静電塗装する工程、
(4)該着色塗料(B)の未硬化塗膜上に、熱硬化性クリヤ塗料(C)を静電塗装する工程、次いで
(5)上記の塗料(A)、(B)及び(C)からなる三層塗膜を同時に焼き付けて、JIS Z 8721に規定されるマンセル表色系に基づく明度(N値)が8.5以上を有する複層塗膜を得る工程。
塩素化ポリプロピレン(塩素含有率15%、マレイン酸変性量2.0%、ケン化価30mgKOH/g、重量平均分子量80,000)500部、n−ヘプタン150部、N−メチル−ピロリドン50部からなる混合物(50℃)に、ジメチルエタノールアミン12部、及びノニオン系界面活性剤(商品名「ノイゲンEA−140」、第一工業製薬(株)製)5部を仕込み、同温度で1時間攪拌した後、脱イオン水2,000部を徐々に仕込み、さらに1時間攪拌を行った。次に、70℃の温度で減圧して、n−ヘプタン及び脱イオン水の合計600部を留去して、固形分24%のポリオレフィンエマルションNo.1を得た。
塩素化ポリプロピレン(塩素含有率35%、マレイン酸変性量1.9%、ケン化価28mgKOH/g、重量平均分子量60,000)を用いて、製造例1と同様にして、固形分24%のポリオレフィンエマルションNo.2を得た。
撹拌機、温度計、還流冷却器等の備わった反応槽に、エチレングリコールモノブチルエーテル40部、イソブチルアルコール30部を仕込み、加熱撹拌し、100℃に達してから下記の単量体等の混合物を3時間かけて滴下した。
メチルメタクリレート 38部
n−ブチルアクリレート 25部
2−ヒドロキシエチルメタクリレ−ト 20部
アクリル酸 7部
2,2’−アゾビスイソブチロニトリル 1部
イソブチルアルコール 5部。
製造例1で得られたポリオレフィンエマルションNo.1を40部(固形分)、製造例3で得られた水溶性アクリル樹脂15部(固形分)、ウレタンエマルション(商品名「サンプレンUX−5100A」、三洋化成工業(株)製)30部(固形分)、親水性ヘキサメチレンジイソシアヌレート(商品名「バイヒジュール3100」、住化バイエルウレタン(株)製)15部(固形分)、ルチル型酸化チタン(商品名「JR−903」、テイカ社製)130部を混合し、ミキサーで十分に攪拌し、水性白色プライマー塗料No.1を得た。この塗料の水分含有量は45%であり、固形分含量は52%であった。
製造例4と同様の操作にて、表1の配合内容に従って、水性白色プライマー塗料No.2〜No.5を得た。
「バイヒジュール3100」:商品名、住化バイエルウレタン(株)製、親水性ヘキサメチレンジイソシアヌレート、
「JR−903」:商品名、テイカ社製、ルチル型酸化チタン、
「ケッチェンブラックEC600J」:商品名 、ライオン(株)製、導電性カーボン、
「デントールWK500」:商品名、大塚化学(株)製、酸化スズ/アンチモンで表面被覆された針状酸化チタン。
工程1:プラスチック基材として、黒色のポリプロピレンをバンパー形状に成型加工したのち、脱脂処理したものを用い、これに水性白色プライマー塗料No.1を、乾燥膜厚で25μmになるようにエアスプレー塗装した。基材の温度は25℃であった。
実施例1と比べて、下記表2の内容を変更する以外は、同じ工程によって複層塗膜No.2〜No.6を形成した。
工程1:プラスチック基材として、黒色のポリプロピレンをバンパー形状に成型加工したのち、脱脂処理したものを用い、これに水性白色プライマー塗料No.1を、乾燥膜厚で25μmになるようにエアスプレー塗装した。基材の温度は25℃であった。
比較例1と比べて、下記表4の内容を変更する以外は、同じ工程によって複層塗膜を形成した。
Claims (6)
- (1)プラスチック基材に、JIS Z 8729に規定されるL*a*b*表色系に基づく明度(L*値)として80以上の塗膜が得られる、水分含有量15〜48重量%の水性白色プライマー塗料(A)を塗装する工程、
(2)該プライマー塗料(A)の上記塗装塗膜を、予備加熱して、塗膜中の水分含有量を1〜10重量%の範囲内に、且つ、塗膜の表面電気抵抗値を109Ω/□未満に調整する工程、
(3)該プライマー塗料(A)の上記調整塗膜上に、熱硬化性透明着色塗料(B)を静電塗装する工程、
(4)該着色塗料(B)の未硬化塗膜上に、熱硬化性クリヤ塗料(C)を静電塗装する工程、次いで
(5)上記の塗料(A)、(B)及び(C)からなる三層塗膜を同時に焼き付けて、JIS Z 8721に規定されるマンセル表色系に基づく明度(N値)が8.5以上を有する複層塗膜を得る工程、を含むことを特徴とするプラスチック基材の塗膜形成方法。 - 工程(3)における熱硬化性透明着色塗料(B)塗装後の水性白色プライマー塗料(A)の塗膜の表面電気抵抗値が、109Ω/□未満である請求項1に記載の塗膜形成方法。
- 工程(1)において、プラスチック基材をあらかじめ35〜60℃程度に加熱しておく請求項1に記載の塗膜形成方法。
- 水性白色プライマー塗料(A)が、塩素化ポリオレフィン、白色顔料及び水を含有する塗料である請求項1に記載の塗膜形成方法。
- 水性白色プライマー塗料(A)が、更に、改質樹脂を含有する塗料である請求項4に記載の塗膜形成方法。
- 請求項1〜5のいずれかに記載の塗膜形成方法によって得られた塗装プラスチック物品。
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CN101790428A (zh) * | 2007-07-06 | 2010-07-28 | 丰田自动车株式会社 | 涂装方法和使用该涂装方法得到的涂装体 |
US8795835B2 (en) | 2007-07-06 | 2014-08-05 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Coating method and coated article obtained by the same |
JP2010535914A (ja) * | 2007-08-14 | 2010-11-25 | ビーエーエスエフ コーティングス ゲゼルシャフト ミット ベシュレンクテル ハフツング | 水性被覆剤、その製造法及びその使用 |
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WO2013081029A1 (ja) * | 2011-11-30 | 2013-06-06 | いすゞ自動車株式会社 | 静電塗装方法 |
JP2013111554A (ja) * | 2011-11-30 | 2013-06-10 | Isuzu Motors Ltd | 静電塗装方法 |
US9724728B2 (en) | 2011-11-30 | 2017-08-08 | Taikisha Ltd. | Electrostatic coating method |
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