JP6680401B2 - 湿気硬化型ポリウレタンホットメルト樹脂組成物、及び、それを用いた物品 - Google Patents
湿気硬化型ポリウレタンホットメルト樹脂組成物、及び、それを用いた物品 Download PDFInfo
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- JP6680401B2 JP6680401B2 JP2019511511A JP2019511511A JP6680401B2 JP 6680401 B2 JP6680401 B2 JP 6680401B2 JP 2019511511 A JP2019511511 A JP 2019511511A JP 2019511511 A JP2019511511 A JP 2019511511A JP 6680401 B2 JP6680401 B2 JP 6680401B2
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Classifications
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Description
また、近年は生産効率を向上するため、養生時間を短縮可能な材料が強く求められている中で、前記耐湿熱性ホットメルト接着剤組成物は、低温時においても接着できるというメリットを有するものの、速硬化を望む場面では実際上使用できないものであった。また、触媒等を添加することにより、速硬化性を向上する手法も考えられるが、経時での粘度上昇等も懸念されるため、その両立を実現することは困難であった。
<アクリルポリオール−1の合成>
温度計、攪拌機及び冷却管を備えた反応容器に、メチルエチルケトン300質量部を入れ、容器内温度を80℃にした後、メタクリル酸340質量部、メタクリル酸ブチル340質量部、メタクリル酸2−ヒドロキシエチル10質量部、アゾビスイソブチロニトリル8.5質量部をメチルエチルケトン160質量部に溶解したものを添加、混合し、16時間反応させることによって、アクリルポリオール−1(不揮発分:52質量%、粘度;20,000mPa・s(23℃))を得た。
<ウレタンプレポリマー(i−1)の合成>
温度計、撹拌機、不活性ガス導入口および還流冷却器を備えた四口フラスコに、ポリプロピレングリコール(数平均分子量;1,000)15質量部、ポリプロピレングリコール(数平均分子量;2,000、以下「PPG2000」と略す。)15質量部、結晶性ポリエステルポリオール(1,6−ヘキサンジオールと1,12−ドデカンジカルボン酸とを反応させたもの、数平均分子量;3,500)20質量部、非晶性ポリエステルポリオール(ビスフェノールAのプロピレンオキサイド6モル付加物と、セバシン酸、イソフタル酸を反応させたもの、数平均分子量;2,000)7.5質量部、非晶性ポリエステルポリオール(ネオペンチルグリコール、ジエチレングリコール、1,6−ヘキサンジオール及びアジピン酸を反応させたもの、数平均分子量;2,000)7.5質量部、アクリルポリオール−1の溶剤を乾燥して固形化したものを20質量部仕込み、減圧下100℃でポリオール混合物中の水分含有率が0.05質量%以下となるまで脱水した。
次いで、容器内温度70℃に冷却後、4,4’−ジフェニルメタンジイソシアネート(MDI)15.5質量部を加え、100℃まで昇温して、NCO基含有率が一定となるまで約3時間反応させて、イソシアネート基を有するウレタンプレポリマー(i−1)を得た。
前記合成例において、ポリオールの数平均分子量は、ゲル・パーミエーション・クロマトグラフィー(GPC)法により、下記の条件で測定した値を示す。
カラム:東ソー株式会社製の下記のカラムを直列に接続して使用した。
「TSKgel G5000」(7.8mmI.D.×30cm)×1本
「TSKgel G4000」(7.8mmI.D.×30cm)×1本
「TSKgel G3000」(7.8mmI.D.×30cm)×1本
「TSKgel G2000」(7.8mmI.D.×30cm)×1本
検出器:RI(示差屈折計)
カラム温度:40℃
溶離液:テトラヒドロフラン(THF)
流速:1.0mL/分
注入量:100μL(試料濃度0.4質量%のテトラヒドロフラン溶液)
標準試料:下記の標準ポリスチレンを用いて検量線を作成した。
東ソー株式会社製「TSKgel 標準ポリスチレン A−500」
東ソー株式会社製「TSKgel 標準ポリスチレン A−1000」
東ソー株式会社製「TSKgel 標準ポリスチレン A−2500」
東ソー株式会社製「TSKgel 標準ポリスチレン A−5000」
東ソー株式会社製「TSKgel 標準ポリスチレン F−1」
東ソー株式会社製「TSKgel 標準ポリスチレン F−2」
東ソー株式会社製「TSKgel 標準ポリスチレン F−4」
東ソー株式会社製「TSKgel 標準ポリスチレン F−10」
東ソー株式会社製「TSKgel 標準ポリスチレン F−20」
東ソー株式会社製「TSKgel 標準ポリスチレン F−40」
東ソー株式会社製「TSKgel 標準ポリスチレン F−80」
東ソー株式会社製「TSKgel 標準ポリスチレン F−128」
東ソー株式会社製「TSKgel 標準ポリスチレン F−288」
東ソー株式会社製「TSKgel 標準ポリスチレン F−550」
合成例2で得られたウレタンプレポリマー(i−1)100質量部、ビス(2,6−ジメチルモルホリノエチル)エーテル0.4質量部、メタンスルホン酸0.03質量部を混合して湿気硬化型ポリウレタンホットメルト樹脂組成物を得た。
用いる硬化触媒(ii)および有機酸(iii)の種類及び/又は量を表1〜2に示す通りに変更した以外は実施例1と同様にして湿気硬化型ポリウレタンホットメルト樹脂組成物を得た。
(初期粘度の測定方法)
実施例および比較例にて湿気硬化型ポリウレタンホットメルト樹脂組成物を得た直後に、湿気硬化型ポリウレタンホットメルト樹脂組成物を110℃に溶融し、1mlをサンプリングし、コーンプレート粘度計(40Pコーン、ローター回転数;50rpm)にて粘度を測定した。
(継経時粘度の測定方法)
実施例および比較例にて得られた湿気硬化型ポリウレタンホットメルト樹脂組成物を50℃の条件下で4週間放置した後、同様にして粘度を測定した。
(評価)
経時粘度の値を初期粘度の値で除した数が1.3未満であれば「○」、1.3以上であれば「×」と評価した。
実施例および比較例で得られた湿気硬化型ポリウレタンホットメルト樹脂組成物を110℃に溶融し、110℃に予め加熱された内径0.4mmのディスペンサーニードル(武蔵エンジニアリング株式会社製「ML−5000Xii)を用いて吐出圧力:0.3MPa、速度:50mm/秒にて、中央に1cm径の穴の開いたPC板(5cm×9cm)上に1インチの円形で0.2mm厚となるように塗布して、その上からアクリル板(5cm×5cm)を貼り合わせた後、温度23℃、湿度50%の恒温恒湿槽中に放置することで物品を作製した。
前記[物品の作製方法]にて、恒温恒湿槽中に放置してから30分経過後の物品を取り出し、物品のプッシュ強度をオートグラフ(株式会社島津製作所AUTOGRAPH「AGS−X」を使用して、クロスヘッドスピード:10mm/分の条件で測定し、初期接着強度(N/cm2)を測定した。なお、初期接着強度が70N/cm2以上であれば、優れた初期接着強度を有すると判断した。
前記[物品の作製方法]にて、恒温恒湿槽中に放置してから48時間経過後の物品を取り出し、同様異にテンシロンを使用して最終接着強度(N/cm2)を測定した。
前記[最終接着強度の測定方法]で接着強度測定後の物品を、デュポン式落下衝撃試験機にてアクリル板から撃芯を介して、荷重:100g、高さ:10cmで衝撃を3回与え、PC板の剥がれの発生がなければ更に10cm高さを高くする条件でそれぞれ耐落下衝撃性試験を続けた。それぞれ目視観察により剥がれの有無を確認し、剥がれが生じた高さ(cm)を評価した。なお、30cm以上であれば耐落下衝撃性に優れると判断した。
実施例および比較例で得られた湿気硬化型ポリウレタンホットメルト樹脂組成物を110℃に溶融し、110℃に予め加熱された内径0.4mmのディスペンサーニードル(武蔵エンジニアリング株式会社製「ML−5000Xii)を用いて吐出圧力:0.3MPa、速度:50mm/秒にて、中央に穴の開いていないPC板(5cm×9cm)上に1インチの円形で0.2mm厚となるように塗布して、その上からアクリル板(5cm×5cm)を貼り合わせた後、温度23℃、湿度50%の恒温恒湿槽中に48時間放置することで評価用物品を作製した。
この評価用物品を、水浸漬(23℃、0.5時間)させた後、物品内部への水侵入の有無の評価を、JIS IPX−7に準拠して行い、水の侵入が確認されなかったものは防水性に優れるため「○」、水の侵入が確認されたものは「×」と評価した。
Claims (3)
- イソシアネート基を有するウレタンプレポリマー(i)を含有する湿気硬化型ポリウレタンホットメルト樹脂組成物であって、
前記ウレタンプレポリマー(i)が、ポリエーテルポリオール(a−1)、結晶性ポリエステルポリオール(a−2)、非晶性ポリエステルポリオール(a−3)、及び、アクリルポリオール(a−4)を含有するポリオール(A)とポリイソシアネート(B)との反応物であり、
前記結晶性ポリエステルポリオール(a−2)の使用量が、前記ポリエーテルポリオール(a−1)100質量部に対して、20〜150質量部の範囲であり、
前記非晶性ポリエステルポリオール(a−3)の使用量が、前記ポリエーテルポリオール(a−1)100質量部に対して、20〜150質量部の範囲であり、
前記アクリルポリオール(a−4)の使用量が、前記ポリエーテルポリオール(a−1)100質量部に対して、20〜400質量部の範囲であり、
前記湿気硬化型ポリウレタンホットメルト樹脂組成物が、更に下記一般式(1)で示される硬化触媒(ii)を、前記ウレタンプレポリマー(i)100質量部に対して、0.2〜1質量部の範囲で含有し、
硫黄原子を含む有機酸(iii)を、前記ウレタンプレポリマー(i)100質量部に対して、0.0001〜0.5質量部の範囲で含有し、
前記有機酸(iii)が、メタンスルホン酸、及び/又は、エタンスルホン酸であり、
前記硬化触媒(ii)と有機酸(iii)との質量比[(ii)/(iii)]が、92/8〜99.5/0.5の範囲であることを特徴とする湿気硬化型ポリウレタンホットメルト樹脂組成物。
- 前記硬化触媒(ii)が、ジモルホリノジエチルエーテル、及び/又は、ビス(2,6−ジメチルモルホリノエチル)エーテルである請求項1記載の湿気硬化型ポリウレタンホットメルト樹脂組成物。
- 少なくとも2つの部材を請求項1又は2記載の湿気硬化型ポリウレタンホットメルト樹脂組成物で貼り合わせたことを特徴とする物品。
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