JP7125307B2 - 硬化性樹脂組成物、複合部材及びその製造方法 - Google Patents
硬化性樹脂組成物、複合部材及びその製造方法 Download PDFInfo
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- JP7125307B2 JP7125307B2 JP2018161085A JP2018161085A JP7125307B2 JP 7125307 B2 JP7125307 B2 JP 7125307B2 JP 2018161085 A JP2018161085 A JP 2018161085A JP 2018161085 A JP2018161085 A JP 2018161085A JP 7125307 B2 JP7125307 B2 JP 7125307B2
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- polyamide
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Description
(b)ラクタム成分及びアミノカルボン酸成分のうち少なくとも一方の成分からなる第2のアミド形成成分;
(c)第1のアミド形成成分及び第2のアミド形成成分。
ブロックポリイソシアネートのポリイソシアネートは、芳香族ポリイソシアネート、脂環族ポリイソシアネート、脂肪族ポリイソシアネート、複素環式ポリイソシアネートのいずれであってもよい。芳香族ポリイソシアネートとしては、例えば、トリレンジイソシアネート(TDI)、キシリレンジイソシアネート(XDI)、テトラメチルキシリレンジイソシアネート(TMXDI)、ナフタレンジイソシアネート(NDI)、ビス(イソシアナトフェニル)メタン(MDI)、1,3-ビス(イソシアナトフェニル)プロパン、ビス(イソシアナトフェニル)エーテル、ビス(イソシアナトフェニル)スルホン、トルイジンジイソシアネート(TODI)などのジイソシアネートなどが例示できる。脂環族ポリイソシアネートとしては、例えば、シクロヘキサン1,4-ジイソシアネート、イソホロンジイソシアネート(IPDI)、水添キシリレンジイソシアネート、水添ビス(イソシアナトフェニル)メタンなどのジイソシアネート;ビシクロヘプタントリイソシアネートなどのトリイソシアネートなどが例示できる。前記脂肪族ポリイソシアネートとしては、例えば、プロピレンジイソシアネート、トリメチレンジイソシアネート、テトラメチレンジイソシアネート、ヘキサメチレンジイソシアネート(HDI)、トリメチルヘキサメチレンジイソシアネート(TMDI)、リジンジイソシアネート(LDI)などのC2-12アルカンジイソシアネート;1,3,6-ヘキサメチレントリイソシアネート、1,6,11-ウンデカントリイソシアネートメチルオクタンなどのアルカントリイソシアネートなどが例示できる。
エポキシ化合物(又はエポキシ樹脂)としては、例えば、グリシジルエーテル化合物、グリシジルエステル化合物、グリシジルアミン化合物、複素環式エポキシ化合物、脂環式エポキシ化合物などが挙げられ、複数のグリシジル基又はオキシラン環を有している。グリシジルエーテル化合物(グリシジルエーテル型エポキシ樹脂)としては、例えば、ビスフェノール型エポキシ樹脂(ビスフェノールA型、ビスフェノールF型、ビスフェノールAD型、ビスフェノールS型、ビスフェノールフルオレン型などのビスフェノール類をベースとするエポキシ樹脂)、ナフトール型エポキシ樹脂、ビフェニル型エポキシ樹脂、トリフェノールメタン型エポキシ樹脂、ノボラック型エポキシ樹脂(フェノールノボラック型エポキシ樹脂、クレゾールノボラック型エポキシ樹脂など)、変性ノボラック型エポキシ樹脂などが挙げられる。
本発明では、前記ポリアミド系樹脂のアミノ基(並びにカルボキシル基)、ブロックポリイソシアネートのイソシアネート基、及びエポキシ化合物のエポキシ基(並びにヒドロキシル基)が複雑に反応し、金属などの基材に対して高い密着力で密着するようである。例えば、代表的には、ブロックポリイソシアネートのイソシアネート基は、ポリアミド系樹脂のアミノ基(並びにエポキシ化合物のヒドロキシル基)と反応し、エポキシ化合物のエポキシ基は、ポリアミド系樹脂のアミノ基(並びにカルボキシル基)と反応して、基材に接着剤層(硬化膜又はプライマー層)を形成するようである。そのため、各成分の割合及び各成分の上記反応性基の割合も複雑化する。
本発明の硬化性樹脂組成物は、溶媒を含む液体組成物(溶液状組成物又は分散体)であってもよく、粉末状又は粉粒状の形態を有していてもよい。硬化性樹脂組成物は、通常、粉末状の前記ポリアミド系樹脂と、粉末状のブロックポリイソシアネートと、粉末状のエポキシ化合物との混合物(粉末混合物)であってもよく、前記成分(前記ポリアミド系樹脂、ブロックポリイソシアネート及びエポキシ化合物)を混合した組成物(一体に固化した組成物)の粉末又は粉粒体の形態を有していてもよい。
複合部材は、基材(又は部材)の表面に前記硬化性樹脂組成物(接着性樹脂組成物)をコーティングし、接着剤層(硬化膜又はプライマー層)を形成することにより製造できる。
複合成形部材は、前記複合部材(前記金属基材などの基材と、この基材の表面に形成された前記接着剤層とを備えた複合部材)の接着剤層に、少なくとも熱可塑性樹脂を含む組成物をモールド又は積層することにより製造できる。
鋼板(日本テストパネル(株)から販売されているステンレス鋼板SUS430)を脱脂処理して用いた。
PA1:ポリアミド12(ダイセル・エボニック(株)製、吸水率0.25%、アミノ基濃度145 mmol/kg、カルボキシル基濃度4 mmol/kg、粉体:平均粒子径47μm)
PA2:コポリアミド6/6/12(ダイセル・エボニック(株)製、吸水率1.5%、アミノ基濃度187 mmol/kg、カルボキシル基濃度1.5 mmol/kg、粉体:平均粒子径42μm)
B-I:ブロックイソシアネート(Evonik社製「VESTAGON BF1540」ウレチジオン(Uretdione) ポリイソシアネート アダクト、イソシアネート基濃度 3600 mmol/kg、ガラス転移温度84℃以下、粉体)
なお、イソシアネート基の濃度は、イソシアネート含量から算出した。
EP1:ビスフェノールA型エポキシ樹脂(三菱ケミカル(株)製、エポキシ基濃度500 mmol/kg、ヒドロキシル基濃度 3600 mmol/kg、粉体)
EP2:ビスフェノールA型エポキシ樹脂(チバ・ガイギー社製「AralditeGT7004」、エポキシ基濃度1500 mmol/kg、粉体)
エポキシ基の濃度は、エポキシ当量から算出し、ヒドロキシル基濃度は、エポキシ樹脂の分子量から得られた繰り返し単位の数に基づいて算出した。
PA3:(株)東レ製 「アミランCM1017」、ASTM D570による吸水率1.8%、アミノ基濃度37 mmol/kg)
ポリアミド樹脂の粉体、ブロックポリイソシアネートの粉体及びエポキシ樹脂の粉体を表1に示す割合で混合して粉体混合物を調製し、脱脂処理した基材に約100μmの厚みで静電塗装し、オーブン中、185℃で5分間加熱し、塗膜を形成し、複合部材を調製した。
得られた複合成形体の基材に対する樹脂層の接着強度を、ISO 19095-2 Type Bに従って測定した。
得られた複合成形体を、80℃の熱水に50時間浸漬した後、上記と同様にして接着強度を測定した。
Claims (15)
- ポリアミド系樹脂と、ブロックポリイソシアネートと、エポキシ化合物とを含む樹脂組成物であって、前記ポリアミド系樹脂のアミノ基とカルボキシル基との割合(モル比)が、前者/後者=60/40~99.9/0.1であり、前記ポリアミド系樹脂が、アミノ基を20~300mmol/kgの濃度で含み、かつASTM D570に規定する吸水性試験において1質量%以下の吸水率を有しており、
前記ポリアミド系樹脂の量的割合が、前記ポリアミド系樹脂、前記ブロックポリイソシアネート及び前記エポキシ化合物の総量100質量%に対して50~95質量%であり、
前記ブロックポリイソシアネートのイソシアネート基の全モル数が、前記ポリアミド系樹脂のアミノ基の全モル数に対して1.3~50倍であり、
前記エポキシ化合物のエポキシ基の割合が、前記ポリアミド系樹脂のアミノ基濃度1モルに対して0.1~1モルであり、
前記ポリアミド系樹脂のカルボキシル基と前記エポキシ化合物のエポキシ基との割合(モル比)が、前者/後者=0.01/1~0.5/1である、硬化性樹脂組成物。 - ポリアミド系樹脂が、C8-18アルキレン鎖を含んでおり、アミノ基濃度25~275mmol/kg、及び融点160~250℃を有する請求項1記載の硬化性樹脂組成物。
- ポリアミド系樹脂が、ポリアミド系樹脂を形成する成分の総量に対して、C8-16アルキレン鎖を有する成分の割合が65~100モル%であり、ASTM D570に規定する吸水性試験において0.75質量%以下の吸水率を有する、請求項1又は2記載の硬化性樹脂組成物。
- ポリアミド系樹脂が、ポリアミド系樹脂を形成する成分の総量に対して、C10-14アルキレン鎖を有する成分の割合が70~100モル%であり、アミノ基濃度が50~250mmol/kgであり、融点が170~220℃である請求項1~3のいずれかに記載の硬化性樹脂組成物。
- ポリアミド系樹脂が、C11-13ラクタム及びC11-13アミノカルボン酸から選択された少なくとも一種のC11-13アルキレン鎖を有する成分を、ポリアミド系樹脂を形成する成分の総量に対して、75~100モル%の割合で含み、ASTM D570に規定する吸水性試験において0.65質量%以下の吸水率を有するホモ又はコポリアミド樹脂である請求項1~4のいずれかに記載の硬化性樹脂組成物。
- ポリアミド系樹脂が、ASTM D570に規定する吸水性試験において0.3質量%以下の吸水率を有する請求項1~5のいずれかに記載の硬化性樹脂組成物。
- ブロックポリイソシアネートが、ガラス転移温度60~110℃、融点70~130℃、及び解離温度120~200℃を有し;エポキシ化合物が、軟化温度75℃以上のビスフェノール型エポキシ樹脂を含む、請求項1~6のいずれかに記載の硬化性樹脂組成物。
- ポリアミド系樹脂のアミノ基1モルに対して、ブロックポリイソシアネートのイソシアネート基の割合が1.5~5モルであり、エポキシ化合物のエポキシ基の割合が0.1~0.8モルである請求項1~7のいずれかに記載の硬化性樹脂組成物。
- ポリアミド系樹脂のアミノ基に対して、ブロックポリイソシアネートのイソシアネート基が、15~450mmol/kg過剰であり、アミノ基、イソシアネート基及びエポキシ基の総モル数に対して、エポキシ基の濃度が3~35モル%である請求項1~8のいずれかに記載の硬化性樹脂組成物。
- ポリアミド系樹脂のアミノ基の全モル数に対して、ブロックポリイソシアネートのイソシアネート基の全モル数が、1.5~40倍であり、
ポリアミド系樹脂100質量部に対して、ブロックポリイソシアネートを5~30質量部、エポキシ化合物を5~30質量部の割合で含む請求項1~9のいずれかに記載の硬化性樹脂組成物。 - 基材の表面に請求項1~10のいずれかに記載の硬化性樹脂組成物の接着剤層が形成されている複合部材。
- 基材の表面を請求項1~10のいずれかに記載の硬化性樹脂組成物でコーティングし、接着剤層を形成する、複合部材の製造方法。
- 請求項11記載の複合部材の接着剤層に、少なくとも熱可塑性樹脂を含む組成物がモールド又は積層されている複合成形部材。
- 基材が金属基材であり、熱可塑性樹脂が、硬化性樹脂組成物のポリアミド系樹脂よりも高い融点を有するポリアミド系樹脂を含む請求項13記載の複合成形部材。
- 請求項11記載の複合部材の接着剤層に、少なくとも熱可塑性樹脂を含む組成物をモールド又は積層し、複合成形部材を製造する方法。
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