JP2018150421A - 熱硬化型ウレタン樹脂組成物、フィルム及び物品 - Google Patents
熱硬化型ウレタン樹脂組成物、フィルム及び物品 Download PDFInfo
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- JP2018150421A JP2018150421A JP2017046071A JP2017046071A JP2018150421A JP 2018150421 A JP2018150421 A JP 2018150421A JP 2017046071 A JP2017046071 A JP 2017046071A JP 2017046071 A JP2017046071 A JP 2017046071A JP 2018150421 A JP2018150421 A JP 2018150421A
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- urethane resin
- thermosetting urethane
- film
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Abstract
Description
窒素導入管、温度計、攪拌機を備えた1リットル4つ口丸底フラスコに、酢酸エチル35質量部を投入した。そこに、4,4’−ジシクロヘキシルメタンジイソシアネートを12.5質量部を入れ攪拌を開始した。次いで、予め50℃に加温して融解しておいたポリオキシテトラメチレングリコール(三菱化学株式会社製「PTMG−1000」)17.5質量部加えた。発熱に注意しながら内温を60℃に上昇させた後、温度を保ちながら3時間攪拌し、不揮発分のイソシアネート基の当量重量が500に達したことを確認した。次に、内温を50℃に温調し、1,4−ブタンジオール0.6質量部、1,3−ブタンジオール0.6質量部、トリメチロールプロパン0.6質量部を投入した。発熱に注意しながら内温を60℃に上昇させた後、温度を保ちながら3時間攪拌し、不揮発分のイソシアネート基の当量重量が1630に達したことを確認した。 最後に、メチルエチルケトン35質量部、耐光剤(BASFジャパン株式会社製「チヌビン765」)0.1質量部、および酸化防止剤(BASFジャパン株式会社製「イルガノックス245」)0.15質量部を追加し、30分間攪拌することで主剤(i−1)を得た。
鎖伸長剤の種類及び/または量を表1に示す通り変更した以外は実施例1と同様にして主剤(i−2)〜(i−5)を得た。
鎖伸長剤の種類及び/または量を表1に示す通り変更した以外は実施例1と同様にして主剤(i−6)〜(i−11)を得た。
窒素導入管、温度計、攪拌機を備えた1リットル4つ口丸底フラスコに、65:35の比率で調製した1,4−ブタンジオール/トリメチロールプロパン0.71質量部、反応遅延剤3質量部、ならびに触媒0.06質量部を投入し、室温で30分攪拌することにより硬化剤を得た。
エラストマー注型機のA液タンクに、調製例1で得られた主剤(i−1)100質量部、レベリング剤(ビックケミー・ジャパン株式会社製「BYK−394」)0.2質量部を、B液タンクに、製造例1で得られた硬化剤4.0質量部を仕込んだ。A液系、B液系ともに室温で運転し、ミキシングヘッドでNCO/OH比=1.10で二液を混合して熱硬化型ウレタン樹脂組成物(1)を得た。
主剤の種類及び硬化剤の量を表2に示す通り変更した以外は実施例1と同様にして熱硬化型ウレタン樹脂組成物(2)〜(5)を得た。
エラストマー注型機のA液タンクに、比較調製例1で得られた主剤(i−6)100質量部、レベリング剤(ビックケミー・ジャパン株式会社製「BYK−394」)0.2質量部を、B液タンクに、製造例1で得られた硬化剤4.0質量部を仕込んだ。A液系、B液系ともに室温で運転し、ミキシングヘッドでNCO/OH比=1.10で二液を混合して熱硬化型ウレタン樹脂組成物(C1)を得た。
主剤の種類及び硬化剤の量を表3に示す通り変更した以外は比較例1と同様にして熱硬化型ウレタン樹脂組成物(C2)〜(C6)を得た。
実施例及び比較例で得られた熱硬化型ウレタン樹脂組成物をマヨネーズ瓶に投入し、粘度(25℃)を測定した。その粘度を基準とし、混合液を25℃で静置して20%増粘するまでの時間を測定し、以下のように評価した。
◎:20時間以上
〇:10時間以上20時間未満
△:6時間以上10時間未満
×:6時間未満
実施例及び比較例で得られた熱硬化型ウレタン樹脂組成物をPETフィルム上にナイフコーターにより厚さ30μmで塗工し、その後、乾燥機で硬化させ、触感覚でタックがなくなるまでの時間を測定して以下のように評価した。
〇:110℃×2分でタックがなくなる
△:110℃×4分でタックがなくなる
×:110℃×6分でタックがなくなる
実施例及び比較例で得られた熱硬化型ウレタン樹脂組成物を離型処理の施されたポリエチレンテレフタラートフィルムへナイフコーターにより厚さ30μmで塗工し、次いで、オーブン中で、110℃でタックがなくなるまで加熱し硬化させて、フィルムを作製した。
前記フィルムに真鍮ブラシを500g荷重で塗膜に押し当て、10往復移動させた後、目視で傷の有無を確認し、以下のように評価した。
◎:5分以内で傷が回復
〇:10分以内で傷が回復
△:1時間以内で傷が回復
×:1時間を経過しても傷が回復しない
前記フィルムを幅1cm長さ5cmの短冊状に切り取り、株式会社島津製作所製「オートグラフAG−I」を用いてフィルムを引っ張り、伸び率を測定した。
◎:220%以上
〇:180%以上220%未満
△:150%以上180%未満
×:150%未満
Claims (7)
- 芳香族環式構造を有しないポリオール(a1)と芳香族環式構造を有しないポリイソシアネート(a2)との反応物である分子末端にイソシアネート基を有するウレタンプレポリマー(A)、鎖伸長剤(B)、及び有機溶剤(C)を含有する主剤(i)と、硬化剤(ii)とを含有する熱硬化型ウレタン樹脂組成物であって、
前記鎖伸長剤(B)が、分岐ジオール(b1)を含有するものであり、
前記分岐ジオール(b1)の前記主剤(i)の不揮発分中の含有量が、2質量%以下であることを特徴とする熱硬化型ウレタン樹脂組成物。 - 前記鎖伸長剤(B)が、さらに、前記分岐ジオール(b1)以外の分子量500以下の低分子量ジオール、及び分子量500以下の低分子量トリオールを含有するものである請求項1記載の熱硬化型ウレタン樹脂組成物。
- 前記分岐ジオール(b1)が有するすべての水酸基が1級水酸基である請求項1記載の熱硬化型ウレタン樹脂組成物。
- 前記主剤(i)の不揮発分中のイソシアネート基当量が、1,000〜4,000g/eq.の範囲である請求項1記載の熱硬化型ウレタン樹脂組成物。
- 前記熱硬化型ウレタン樹脂組成物からなる硬化塗膜の周波数1Hzでの動的粘弾性スペクトルで測定されるtanδのピーク温度が、10〜40℃の範囲である請求項1記載の熱硬化型ウレタン樹脂組成物。
- 請求項1〜5のいずれか1項記載の熱硬化型ウレタン樹脂組成物の硬化塗膜を有することを特徴とするフィルム。
- 請求項6項記載のフィルムを有することを特徴とする物品。
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