JP2005194352A - 熱硬化型一液塗料組成物 - Google Patents
熱硬化型一液塗料組成物 Download PDFInfo
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- JP2005194352A JP2005194352A JP2004000745A JP2004000745A JP2005194352A JP 2005194352 A JP2005194352 A JP 2005194352A JP 2004000745 A JP2004000745 A JP 2004000745A JP 2004000745 A JP2004000745 A JP 2004000745A JP 2005194352 A JP2005194352 A JP 2005194352A
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- Prior art keywords
- group
- urethane prepolymer
- active hydrogen
- thermosetting
- weight
- 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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- 239000000203 mixture Substances 0.000 title claims abstract description 15
- 238000000576 coating method Methods 0.000 title abstract description 74
- 239000011248 coating agent Substances 0.000 title abstract description 70
- 239000000463 material Substances 0.000 title abstract description 12
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 claims abstract description 60
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims abstract description 52
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 claims abstract description 46
- 150000001875 compounds Chemical class 0.000 claims abstract description 32
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- 125000003118 aryl group Chemical group 0.000 description 2
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Abstract
【解決手段】アクリル重合体微粒子(A)と、粉体状ブロック型ウレタンプレポリマー(B)と、活性水素基含有化合物(C)と、触媒(D)とを含有している熱硬化型一液塗料組成物であって、前記粉体状ブロック型ウレタンプレポリマーが、末端イソシアネート基含有ウレタンプレポリマーのイソシアネート基とブロック化剤の活性水素基とが結合した粉体状ブロック型イソシアネート基含有ウレタンプレポリマーからなり、さらに、前記粉体状ブロック型ウレタンプレポリマーの熱溶融温度が100℃以上160℃以下であり、かつ、熱解離温度が130℃以下であり、前記活性水素基含有化合物の重量平均分子量が1000以上10000以下であり、かつ、平均活性水素基数が2.7以上6以下である。
【選択図】なし
Description
活性水素基(AH基)が水酸基(OH基)であると、取り扱いが容易であり、低コストであり、さらに、塗膜を作製したときに、耐腐食性が向上する。
酢酸エチル溶媒にトリメチロールプロパン200gを溶解した後、2,4−トリレンジイソシアネート780gを添加し90℃で3時間反応させ、NCO基の含有量が19重量%の末端イソシアネート基含有ウレタンプレポリマーを調製した。さらに、メチルエチルケトオキシム430gを徐々に添加して40℃で1時間反応させた。NCO基の含有量が消失した時点で20℃まで冷却して24時間放置して再結晶させた後、得られた結晶化物を取り出し乾燥させ、ジェットミル粉砕機により粉砕処理した。
酢酸エチル溶媒に4,4'−ジフェニルメタンジイソシアネート1000gを溶解した後、メチルエチルケトオキシム730gを徐々に添加して40℃で1時間反応させた。NCO基の含有量が消失した時点で20℃まで冷却して24時間放置して再結晶させた後、得られた結晶化物を取り出して乾燥させ、ジェットミル粉砕機により粉砕処理した。
(粉体状ブロック型ウレタンプレポリマー(B’)の調整)
酢酸エチル溶媒に4,4'−ジフェニルメタンジイソシアネート1000gを溶解した後、ジシクロヘキシルアミン1600gを徐々に添加して40℃で1時間反応させた。NCO基の含有量が消失した時点で20℃まで冷却して24時間放置して再結晶させた後、得られた結晶化物を取り出して乾燥させ、ジェットミル粉砕機により粉砕処理した。
粉体状ブロック型イソシアネート基含有ウレタンプレポリマー(I)、粉体状ブロック型イソシアネート(II)、粉体状ブロック型イソシアネート(III)、アクリル重合体微粒子、ポリプロピレンポリオール(I)、ポリプロピレンポリオール(II)(活性水素基含有化合物(C’))、ポリプロピレンポリオール(III)(活性水素基含有化合物(C’))、ポリプロピレンポリオール(IV)(活性水素基含有化合物(C’))、ジオクチルチンジラウレート、炭酸カルシウム、ジイソノニルフタレート、脂肪族系炭化水素を、表1の配合(重量部)により、混合機で混合して、実施例1〜2及び比較例1〜6に係る塗料を調製した。
実施例1〜2及び比較例1〜6に係る塗料について、スプレー特性、及び、貯蔵安定性を下記方法で評価した。その結果を表1に示した。
エアレス塗装機を使用して塗装したときの被塗装物上に形成されるパターン幅により評価した。評価基準は以下の通りである。
○:パターン幅が250mmを越える、
×:パターン幅が250mm未満である。
実施例1〜2及び比較例1〜6に係る塗料を、40℃×10日間貯蔵し、貯蔵前後の20℃での塗料の粘度増加率(%)を測定した。評価基準は以下の通りである。
○:粘度増加率が30%以下である、
×:粘度増加率が30%を超える。
実施例1〜2及び比較例1〜6に係る塗膜について、基材に対する接着性及び塗膜外観を下記方法で評価した。その結果を表1に示した。
実施例1〜2及び比較例1〜6に係る塗膜に、幅25mmにカッターナイフで切り込みを入れ、180°剥離試験を行って、剥離状況を観察した。評価基準は以下の通りである。
○:塗膜の凝集破壊が生じる、
×:電着塗装板/塗膜の界面剥離が生じる、
<塗膜外観:フクレ、ワキ、ピンホール等>
実施例1〜2及び比較例1〜6に係る塗膜を目視で評価した。評価基準は以下の通りである。
○:フクレ、ワキ、ピンホール等なし、
×:フクレ、ワキ、ピンホールのいずれかあり。
Claims (6)
- アクリル重合体微粒子(A)と、粉体状ブロック型ウレタンプレポリマー(B)と、活性水素基含有化合物(C)と、触媒(D)とを含有している熱硬化型一液塗料組成物であって、
前記粉体状ブロック型ウレタンプレポリマー(B)が、末端イソシアネート基含有ウレタンプレポリマーのイソシアネート基(NCO基)とブロック化剤の活性水素基(BH基)とが結合した粉体状ブロック型イソシアネート基含有ウレタンプレポリマー(B1)、又は、有機ポリイソシアネートのイソシアネート基(NCO基)とブロック化剤の活性水素基(BH基)とが結合した粉体状ブロック型イソシアネート(B2)からなり、
さらに、前記粉体状ブロック型ウレタンプレポリマー(B)の熱溶融温度が100℃以上160℃以下であり、かつ、熱解離温度が130℃以下であり、
前記活性水素基含有化合物(C)の重量平均分子量が1000以上10000以下であり、かつ、平均活性水素基(AH基)数が2.7以上6以下であることを特徴とする熱硬化型一液塗料組成物。 - 前記末端イソシアネート基含有ウレタンプレポリマー又は有機ポリイソシアネートのイソシアネート基(NCO基)と活性水素基含有化合物(C)の活性水素基(AH基)との当量比(NCO基/AH基)が、0.5以上2.0以下である請求項1に記載の熱硬化型一液塗料組成物。
- 前記活性水素基含有化合物(C)の活性水素基(AH基)は、水酸基(OH基)である請求項1又は2に記載の熱硬化型一液塗料組成物。
- 前記触媒(D)は、粉体状ブロック型ウレタンプレポリマー(B)及び活性水素基含有化合物(C)の合計量100重量部に対して、0.1重量部以上5重量部以下で含有している請求項1〜3のいずれかに記載の熱硬化型一液塗料組成物。
- 前記粉体状ブロック型ウレタンプレポリマー(B)は、アクリル重合体微粒子(A)100重量部に対して、3重量部以上80重量部以下で含有している請求項1〜4のいずれかに記載の熱硬化型一液塗料組成物。
- 可塑剤、充填剤、発泡剤及び溶媒からなる群から選択される少なくとも1種の添加物質をさらに含有している請求項1〜5のいずれかに記載の熱硬化型一液塗料組成物。
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JP2009509028A (ja) * | 2005-09-21 | 2009-03-05 | イー・アイ・デュポン・ドウ・ヌムール・アンド・カンパニー | 非水性液体コーティング組成物 |
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US8691006B2 (en) | 2005-09-21 | 2014-04-08 | Axalta Coating Systems Ip Co., Llc | Non-aqueous, liquid coating compositions |
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