JP6132256B2 - 反応生成物および防錆性組成物 - Google Patents
反応生成物および防錆性組成物 Download PDFInfo
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- JP6132256B2 JP6132256B2 JP2012202821A JP2012202821A JP6132256B2 JP 6132256 B2 JP6132256 B2 JP 6132256B2 JP 2012202821 A JP2012202821 A JP 2012202821A JP 2012202821 A JP2012202821 A JP 2012202821A JP 6132256 B2 JP6132256 B2 JP 6132256B2
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Description
温度計、冷却器、攪拌機および窒素導入管を備えた反応装置に、(A)成分として3,5−ジメチルピラゾール(1分子中の活性水素数1、活性水素当量96g/eq)96部(活性水素の当量数1)、(B)成分としてビスフェノールA型エポキシ樹脂(ジャパンエポキシレジン社製、製品名「EP1001」、エポキシ当量約475g/eq、不揮発分100%)475部、溶剤としてエチレングリコールモノブチルエーテル571部を仕込み、窒素気流下、撹拌しながら130℃まで昇温し、同温度でエポキシ開環付加反応を行い、適宜に系内サンプリングして、該サンプルのエポキシ基の消失状態を以下のようにして監視した。すなわち、1H-NMR(CDCl3溶液)測定によりエポキシ環のメチンピーク(3.3ppm付近)の保持状態を追跡し、昇温後約4時間経過時に、エポキシ基の消失を確認して反応を終了することにより、固形分濃度50%の中間体を得た(以下、中間体(1−1)という)。ついで、反応系内を90℃まで冷却した後、(C)成分としてメチルトリメトキシシラン部分縮合物(多摩化学(株)製、商品名「MTMS−A」)120部を仕込み、窒素気流下、撹拌しながら90℃で脱メタノール縮合反応を行った。脱メタノール縮合反応の終点は、1H-NMR(CDCl3溶液)測定によるエポキシ樹脂中の水酸基由来のピーク(3.85ppm付近)の保持状態から求めた。更に、所要量のエチレングリコールモノブチルエーテルを加えて希釈し、固形分濃度50%、数平均分子量2800の目的物を得た(以下、反応生成物(1−1)という)。
実施例1において、3,5−ジメチルピラゾール96部に代えて3−アミノ−1,2,4−トリアゾール(1分子中の活性水素数2、活性水素当量42g/eq)42部(活性水素の当量数1)を用いた他は、同様にエポキシ開環付加反応を行うことにより、固形分濃度50%であって、エポキシ基が消失した中間体を得た(中間体(1−2)という)。ついで実施例1と同様に、脱メタノール縮合反応を行うことにより、固形分濃度50%、数平均分子量3300の目的物を得た(以下、反応生成物(1−2)という)。
実施例1と同様にして固形分濃度50%であって、エポキシ基が消失した中間体を得た(以下、中間体(1−3)という)。ついで、実施例1において、(C)成分としてメチルトリメトキシシラン部分縮合物120部に代えてテトラメトキシシラン部分縮合物(多摩化学(株)製、商品名「メチルシリケート51」)130部を用いた他は、同様に脱メタノール縮合反応を行うことにより、固形分濃度50%、数平均分子量3050の目的物を得た(以下、反応生成物(1−3)という)。
実施例1において、3,5−ジメチルピラゾールの使用量を96部から67.2部(活性水素の当量数0.7)に変更した他は、同様にエポキシ開環付加反応を行うことにより、残存エポキシ基を有する中間体を得た(中間体(1−4)という)。ついで実施例1と同様に脱メタノール縮合反応を行うことにより、固形分濃度50%、数平均分子量2200の目的物を得た(以下、反応生成物(1−4)という)。
実施例1において、3,5−ジメチルピラゾールの使用量を96部から48部(活性水素の当量数0.5)に変更した他は、同様にエポキシ開環付加反応を行うことにより、固形分濃度50%であって、残存エポキシ基を有する中間体を得た(中間体(1−5)という)。ついで実施例1と同様に脱メタノール縮合反応させて、固形分濃度50%、数平均分子量2100の目的物を得た(反応生成物(1−5)という)。
実施例1において、(A)成分として3,5−ジメチルピラゾール67.2部(活性水素の当量数0.7)、(B)成分としてジエタノールアミン(1分子中の活性水素数1、活性水素当量105g/eq)31.5 部(活性水素の当量数0.3)に変更した他は、同様にエポキシ開環付加反応を行うことにより、固形分濃度50%であって、エポキシ基が消失した中間体を得た(中間体(2−1)という)。ついで実施例1と同様に脱メタノール縮合反応させて、固形分濃度50%、数平均分子量3900の目的物を得た(反応生成物(2−1)という)。
実施例1で得た中間体(1−1)をいう。
実施例2で得た中間体(1−2)をいう。
実施例4で得た中間体(1−4)をいう。
実施例5で得た中間体(1−5)をいう。
1)防錆性
実施例1〜3および実施例6で得られた反応生成物(固形分換算で80部)、ならびに比較例1〜2記載のもの(固形分換算で80部)からなる各供試サンプルに、カーボンブラック10部、沈降性硫酸バリウム30部、タルク30部、防錆顔料(テイカ(株)製、商品名「Kホワイト#84」)10部、および所要量のエチレングリコールモノエチルエーテルを混合した後、ペイントシェーカーで30分間混練し、固形分50%の防錆プライマーを得た。該プライマーをそれぞれ脱脂鋼板にスプレー塗布し、常温で5日間放置することにより、乾燥塗膜厚が30μmの試験板を調製した。該試験板について、JIS K5400の耐塩水噴霧試験を行い、120時間後の錆の発生状態を目視観察した。評価基準は、クロスカット部の剥離幅をいい、結果を表1に示す。
前記試験板を40℃の水中に240時間浸漬した後、JIS K5400の碁盤目試験に準拠し、カッターを用いて2mm幅の碁盤目100個を作成し、次いでセロハンテープ剥離して、剥離状態を目視判定した。評価結果を表1に示す。なお、碁盤目試験結果の100/100とは、100個(分子)が全く剥離せず、全てが残存したことを示す(表2においても同じ)。
実施例4および5で得られた各反応生成物、ならびに比較例3および4記載のものからなる各供試サンプル70部(固形分換算)、ビスフェノールA型エポキシ樹脂(ジャパンエポキシレジン社製、製品名「EP1001」、エポキシ当量約475g/eq、不揮発分100%)30部、アミン系硬化剤(大都産業(株)製、MXDA系変性アミン、活性水素当量95)15部、酸化チタン40部、および沈降性硫酸バリウム60部を混合した後、ペイントシェーカーで30分間混練し、次いで所要量のエチレングリコールモノエチルエーテルを加えることにより、固形分50%の防錆塗料を調製した。該塗料をそれぞれ脱脂鋼板にスプレー塗布し、常温で7日間放置して、試験板を調製した。該試験板について前記と同様に耐塩水噴霧試験および碁盤目試験を行い、防錆性と密着性を評価した。結果を表2に示す。なお、顔料分散安定性は、調製した塗料を25℃で1か月放置後、酸化チタンおよび硫酸バリウムの沈降状態および粒ゲージによる顔料の凝集状態より目視評価した。
Claims (9)
- 活性水素含有ヒドラジン類と水酸基含有エポキシ樹脂とを、前記水酸基含有エポキシ樹脂のエポキシ基1当量に対して前記ヒドラジン類の活性水素が0.2〜1.0当量となる割合でエポキシ開環付加反応させて得られる中間体(1)と、アルコキシシラン部分縮合物とを、脱アルコール縮合反応させて得られることを特徴とし、前記ヒドラジン類が、ピラゾール化合物、トリアゾール化合物、テトラゾール化合物、チアジアゾール化合物およびピリダジン化合物からなる群より選ばれる少なくとも1種である、反応生成物(1)。
- 前記アルコキシシラン部分縮合物がテトラメトキシシランおよび/またはメチルトリメトキシシランから得られる部分縮合物である請求項1記載の反応生成物(1)。
- 前記中間体(1)の水酸基1モルに対して前記アルコキシシラン部分縮合物が0.5〜1.5モルとなる割合で脱アルコール縮合反応させて得られる請求項1または2記載の反応生成物(1)。
- 活性水素含有ヒドラジン類および活性水素含有アミン化合物と、水酸基含有エポキシ樹脂とを、前記水酸基含有エポキシ樹脂のエポキシ基1当量に対して、前記ヒドラジン類の活性水素と前記アミン化合物の活性水素との合計が0.2〜1.0当量となる割合でエポキシ開環付加反応させて得られる中間体(2)と、アルコキシシラン部分縮合物とを、脱アルコール縮合反応させて得られることを特徴とし、前記ヒドラジン類が、ピラゾール化合物、トリアゾール化合物、テトラゾール化合物、チアジアゾール化合物およびピリダジン化合物からなる群より選ばれる少なくとも1種である、反応生成物(2)。
- 前記アミン化合物が、第1級および/または第2級アミン化合物である請求項4記載の反応生成物(2)。
- 前記アミン化合物の使用量が、前記ヒドラジン類の使用量に対して、活性水素の当量換算で30%未満である請求項4または5記載の反応生成物(2)。
- 前記アルコキシシラン部分縮合物がテトラメトキシシランおよび/またはメチルトリメトキシシランから得られる部分縮合物である請求項4〜6のいずれかに記載の反応生成物(2)。
- 前記中間体(2)の水酸基1モルに対して前記アルコキシシラン部分縮合物が0.5〜1.5モルとなる割合で脱アルコール縮合反応させて得られる請求項4〜7のいずれかに記載の反応生成物(2)。
- 請求項1〜3のいずれかに記載の反応生成物(1)および/または請求項4〜8のいずれかに記載の反応生成物(2)を含んでなることを特徴とする防錆性組成物。
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