JP2020022934A - プラスチック成形品の塗装方法 - Google Patents
プラスチック成形品の塗装方法 Download PDFInfo
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- JP2020022934A JP2020022934A JP2018148809A JP2018148809A JP2020022934A JP 2020022934 A JP2020022934 A JP 2020022934A JP 2018148809 A JP2018148809 A JP 2018148809A JP 2018148809 A JP2018148809 A JP 2018148809A JP 2020022934 A JP2020022934 A JP 2020022934A
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- Prior art keywords
- aqueous
- mass
- white primer
- plastic molded
- acid
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- -1 diester compound Chemical class 0.000 claims abstract description 54
- 238000000034 method Methods 0.000 claims abstract description 38
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- 238000010521 absorption reaction Methods 0.000 claims abstract description 14
- 125000004432 carbon atom Chemical group C* 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 21
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- NIXOWILDQLNWCW-UHFFFAOYSA-M Acrylate Chemical compound [O-]C(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-M 0.000 description 27
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- 239000005028 tinplate Substances 0.000 description 4
- DYWSVUBJGFTOQC-UHFFFAOYSA-N xi-2-Ethylheptanoic acid Chemical compound CCCCCC(CC)C(O)=O DYWSVUBJGFTOQC-UHFFFAOYSA-N 0.000 description 4
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- AWQSAIIDOMEEOD-UHFFFAOYSA-N 5,5-Dimethyl-4-(3-oxobutyl)dihydro-2(3H)-furanone Chemical compound CC(=O)CCC1CC(=O)OC1(C)C AWQSAIIDOMEEOD-UHFFFAOYSA-N 0.000 description 3
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- 239000005057 Hexamethylene diisocyanate Substances 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
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- 238000005259 measurement Methods 0.000 description 3
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Abstract
Description
(1)プラスチック成形品に水性白色プライマー(I)を塗装し、白色プライマー層を形成する工程、
(2)前記白色プライマー層上に、水性干渉色ベースコート塗料(II)を塗装し、干渉色ベースコート層を形成する工程、
(3)前記干渉色ベースコート層上に、クリヤーコート塗料(III)を塗装し、クリヤーコート層を形成する工程、
(4)前記工程(1)〜(3)により形成された3層の塗膜を同時に焼付け硬化させる工程、
を含むプラスチック成形品の塗装方法であって、
前記水性白色プライマー(I)が、前記(A)〜(F)成分の固形分中、水性ポリオレフィン系樹脂(A)を16〜50質量%、水性アクリル系樹脂(B)を26〜50質量%、ポリエステル樹脂(C)を4〜10質量%、メラミン樹脂(D)を2.5〜10質量%、ブロックポリイソシアネート化合物(E)を4〜20質量%および下記一般式(1)で表されるジエステル化合物(F)を2.5〜10質量%含有し、さらに白色顔料(G)を前記(A)〜(F)成分の固形分100質量部に対して100〜200質量部の範囲内で含有し、
前記水性白色プライマー(I)を60℃で3分間加熱したときの粘度が100〜1000Pa・s(シェアレート0.1秒−1)の範囲内であり、かつ前記白色プライマー層の20℃、2分間水浸漬後における吸水率が50質量%以下である
ことを特徴とするプラスチック成形品の塗装方法。
(1)プラスチック成形品に水性白色プライマー(I)を塗装し、白色プライマー層を形成する工程、
(2)前記白色プライマー層上に、水性干渉色ベースコート塗料(II)を塗装し、干渉色ベースコート層を形成する工程、
(3)前記干渉色ベースコート層上に、クリヤーコート塗料(III)を塗装し、クリヤーコート層を形成する工程、および
(4)前記工程(1)〜(3)により形成された3層の塗膜を同時に焼付け硬化させる工程。
本発明の方法におけるプラスチック成形品としては、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成形品などが挙げられる。
本発明の方法に使用される水性白色プライマー(I)は、水性ポリオレフィン系樹脂(A)、水性アクリル系樹脂(B)、ポリエステル樹脂(C)、メラミン樹脂(D)、ブロックポリイソシアネート化合物(E)、前記一般式(1)で表されるジエステル化合物(F)および白色顔料(G)を含有する。
なかでも、好ましいブロック剤としては、活性メチレン系のブロック剤、ピラゾール又はピラゾール誘導体が挙げられる。
ジエステル化合物(F)は、例えば、2個の末端水酸基を有するポリオキシアルキレングリコールと炭素数4〜18の炭化水素基を有するモノカルボン酸とをエステル化反応させることにより得ることができる。
これら成分の量的関係を一つでも満たさない場合は、本発明の効果を奏することができない。
本発明の方法に使用される水性干渉色ベースコート塗料(II)は、干渉性顔料を水性干渉色ベースコート塗料(II)の全樹脂固形分100質量部に対して例えば1〜80質量部、好ましくは2〜60質量部の範囲で含有する。
本発明の方法に使用されるクリヤーコート塗料(III)は、上塗りクリヤー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。
本発明の方法における工程(1)は、プラスチック成形品に前記水性白色プライマー(I)を塗装し、白色プライマー層を形成する工程である。
なお、前記粘度は、水性白色プライマー(I)について、シェアレート0.1秒−1において、測定温度を3分間で20℃から60℃まで変化させたときの、60℃における粘度を、粘弾性測定装置「HAAKE RheoStress RS150」(商品名、HAAKE社製)を用いて測定することができる。
吸水率(%)={(W3−W1)/(W2−W1)−1}×100 (1)
前記吸水率を調整するには、ジエステル化合物(F)の配合量を調整する等の方法がある。
干渉色ベースコート層の膜厚は、通常、硬化膜厚として、5〜30μm程度、好ましくは10〜20μm程度の範囲内とすることができる。塗装後、適宜、セッティングを施してもよい。
前記クリヤーコート層の膜厚は、通常、硬化膜厚として、10〜40μm程度、好ましくは20〜35μm程度の範囲内とすることができる。塗装後、適宜、セッティングを施してもよい。
<水性ポリオレフィン系樹脂(A)>
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」、第一工業製薬社製)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%の水性ポリオレフィン系樹脂(A)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
トリメチロールプロパン、シクロヘキサンジメタノール、イソフタル酸およびアジピン酸を用いて常法によりエステル化反応せしめた。数平均分子量4500、水酸基価120、酸価10。
重量平均分子量1200、イミノ基含有メチルブチル混合エーテル化メラミン。
ヘキサメチレンジイソシアネ−トをマロン酸ジメチルでフルブロックした化合物。
ジエステル化合物(F−1):ポリオキシエチレングリコールとn−ヘキサン酸とのジエステル化合物。前記一般式(1)において、R1及びR2がそれぞれペンチル基であり、R3がエチレン基であり、mが5である化合物。分子量:434。
ジエステル化合物(F−2):ポリオキシエチレングリコールと2−エチルヘキサン酸とのジエステル化合物。前記一般式(1)において、R1及びR2がそれぞれ2−エチルペンチル基であり、R3がエチレン基であり、mが7である化合物。分子量:578。
ルチル型酸化チタン(商品名「JR−806」、テイカ社製)。
すなわち、プラスチック成形体として、黒色のポリプロピレンを用い、脱脂処理し、これに水性白色プライマー(I)を、乾燥膜厚で30μmになるようにエアスプレー塗装した。得られた塗装塗膜を、室温で3分間放置してセッティングしてから、60℃、3分間のプレヒートを施し、白色プライマー層を形成した。
11cm×45cmの大きさとしたポリプロピレン板の長尺側の端部から3cmの部分に、直径5mmのポンチ孔を、2cm間隔で21個一列状に設けたものを使用し、該ポリプロピレン板上に、水性白色プライマー(I)を、長尺方向にほぼ30μm〜60μmの膜厚が得られるように膜厚勾配をつけて塗装し、3分間放置後、60℃で3分間プレヒートを行なった。
次いで、該未硬化の白色プライマー層上に、水性干渉色ベースコート塗料「WBC−713T No.062」(製品名、関西ペイント社製)を、乾燥膜厚で15μmとなるように非静電塗装し、2分間放置後、80℃で3分間プレヒートを行なった。
さらに、該干渉色ベースコート層上に、クリヤーコート塗料「ソフレックス7175」(製品名、関西ペイント社製)を、乾燥膜厚で25μmとなるように非静電塗装し、該塗装板をほぼ垂直に立てて、塗装後7分間経過後、120℃で30分間加熱して、水性白色プライマー層、干渉色ベースコート層及びクリヤーコート層を硬化させることにより試験板を作製した。
得られた各試験板のポンチ孔下端部から5mmの塗膜のタレが観察される位置を調べ、該位置の膜厚[タレ限界膜厚(μm)]を測定し、以下の基準で耐タレ性の評価を行なった。タレ限界膜厚が大きいほど耐タレ性は良好である。
◎:タレ限界膜厚が40μm以上
○:タレ限界膜厚が35μm以上40μm未満
×:タレ限界膜厚が35μm未満
得られた各試験板のワキが観察される位置を調べ、該位置の膜厚[ワキ限界膜厚(μm)]を測定し、以下の基準で耐ワキ性の評価を行なった。ワキ限界膜厚が大きいほど耐ワキ性は良好である。
◎:ワキ限界膜厚が40μm以上
○:ワキ限界膜厚が35μm以上40μm未満
×:ワキ限界膜厚が35μm未満
平滑性:試験板について、「Wave Scan DOI」(商品名、BYK Gardner社製)によって測定されるWd値を用いて評価した。Wd値が小さいほど塗面の平滑性が高いことを示す。Wd値は小さいほどよいが、少なくとも、27未満という条件を満たす必要がある。
A:21未満
B:21以上24未満
C:24以上27未満
D:27以上30未満
E:30以上
◎:ゴバン目塗膜が100個残存し、カッターの切り込みの縁において塗膜の小さなフチカケが生じていない
○:ゴバン目塗膜が100個残存するが、カッターの切り込みの縁において塗膜の小さなフチカケが生じている
△:ゴバン目塗膜が90〜99個残存する
×:ゴバン目塗膜の残存数が89個以下である。
Claims (1)
- (1)プラスチック成形品に水性白色プライマー(I)を塗装し、白色プライマー層を形成する工程、
(2)前記白色プライマー層上に、水性干渉色ベースコート塗料(II)を塗装し、干渉色ベースコート層を形成する工程、
(3)前記干渉色ベースコート層上に、クリヤーコート塗料(III)を塗装し、クリヤーコート層を形成する工程、
(4)前記工程(1)〜(3)により形成された3層の塗膜を同時に焼付け硬化させる工程、
を含むプラスチック成形品の塗装方法であって、
前記水性白色プライマー(I)が、前記(A)〜(F)成分の固形分中、水性ポリオレフィン系樹脂(A)を16〜50質量%、水性アクリル系樹脂(B)を26〜50質量%、ポリエステル樹脂(C)を4〜10質量%、メラミン樹脂(D)を2.5〜10質量%、ブロックポリイソシアネート化合物(E)を4〜20質量%および下記一般式(1)で表されるジエステル化合物(F)を2.5〜10質量%含有し、さらに白色顔料(G)を前記(A)〜(F)成分の固形分100質量部に対して100〜200質量部の範囲内で含有し、
前記水性白色プライマー(I)を60℃で3分間加熱したときの粘度が100〜1000Pa・s(シェアレート0.1秒−1)の範囲内であり、かつ前記白色プライマー層の20℃、2分間水浸漬後における吸水率が50質量%以下である
ことを特徴とするプラスチック成形品の塗装方法。
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JP2004358462A (ja) * | 2003-05-13 | 2004-12-24 | Nippon Paint Co Ltd | 複層塗膜の形成方法 |
WO2011096480A1 (ja) * | 2010-02-05 | 2011-08-11 | 関西ペイント株式会社 | 水性プライマー組成物及びそれを用いた塗装方法 |
WO2013176266A1 (ja) * | 2012-05-24 | 2013-11-28 | 関西ペイント株式会社 | 水性塗料組成物、複層塗膜形成方法及び複層塗膜を有する物品 |
JP2016087569A (ja) * | 2014-11-07 | 2016-05-23 | 日本ペイント・オートモーティブコーティングス株式会社 | 複層塗膜の形成方法 |
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