JP7137113B1 - 溶融性フッ素樹脂プライマー - Google Patents
溶融性フッ素樹脂プライマー Download PDFInfo
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- JP7137113B1 JP7137113B1 JP2022033067A JP2022033067A JP7137113B1 JP 7137113 B1 JP7137113 B1 JP 7137113B1 JP 2022033067 A JP2022033067 A JP 2022033067A JP 2022033067 A JP2022033067 A JP 2022033067A JP 7137113 B1 JP7137113 B1 JP 7137113B1
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- primer
- fep
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- heat
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Abstract
Description
更に、FEP粒子の固形分に対して質量基準で0.001~5%の熱安定剤を含有することが好ましい。
本開示は、金属基材が配管、パイプ又はダクトであり、その内面に上記積層体が設けられた塗装物品でもある。
本開示の溶融性フッ素樹脂プライマーは、テトラフルオロエチレン(TFE)/ヘキサフルオロプロピレン(HFP)共重合体(FEP)粒子、耐熱性樹脂、非イオン性界面活性剤及び水を含むものであり、前記FEPの平均粒子径が10~60μm、前記耐熱性樹脂は、ポリアミドイミド樹脂、ポリエーテルサルフォン及びポリイミド樹脂からなる群より選ばれる少なくとも1種であり、前記FEP粒子と前記耐熱性樹脂との固形分質量比は50:50~95:5であり、非イオン性界面活性剤は、ポリオキシエチレンアルキルエーテル系界面活性剤であり、水を質量基準で10~60%含むことを特徴とする。
本開示は、水を分散媒とする水系プライマーにおける分散安定性を向上させた、溶融性フッ素樹脂プライマーを提供するものである。
また、被塗装物と溶融性パーフルオロポリマーからなるトップコート層との間での高い接着強度を得るためには、粒子径が大きいFEP粒子を使用することが必要である。
しかしながら、溶融性フッ素樹脂粒子の中でもFEP粒子は、特に疎水性が強く、その粒子径が10~60μmと大きい場合、水に分散させることが極めて困難である。本開示の溶融性フッ素樹脂プライマーは、非イオン性界面活性剤として、ポリオキシエチレンアルキルエーテル系界面活性剤を用いることによって、プライマー中のおけるFEP粒子の優れた分散安定性を実現したものである。
本明細書において、上記FEPのMFRは、ASTM D2116に従って、温度372℃、2.16Kgの荷重で直径2mmのノズルから10分間に押し出された重量で示すものである。
上記FEPは、後述する共重合組成や分子量を調整することにより、上述の範囲内のメルトフローレートを有するものとすることができる。
上記その他の単量体は、通常、FEP樹脂の15mol%以下であることが好ましい。より好ましい上限は10mol%であり、更に好ましい上限は5mol%である。
R-O-A-H
(式中、Rは直鎖状又は分岐鎖状の炭素数5~18のアルキル基、Aはオキシエチレン基を5~20個有するポリオキシエチレン鎖である)で示されるものが好ましい。
Rとしてのアルキル基の炭素数は、10~16であることがより好ましい。上記アルキル基としては、デシル基、ラウリル基、トリデシル基、セチル基、ステアリル基等が例示でき、直鎖状でも分岐鎖状でもよい。
上記ポリオキシエチレン鎖は、オキシエチレン基を7~15個有することがより好ましい。
この範囲にあれば、上記FEP粒子の分散安定性に優れたプライマーが得られる。
なお、本開示において、HLBは、グリフィン法により、次の算出式で定義される値である。
HLB値=20×[親水部の化学式量の総和]/分子量
水の含有量の下限は20質量%であることがより好ましく、25質量%であることが更に好ましい。水の上限は、50質量%であることがより好ましく、40質量%であることが更に好ましい。水の含有量がこの範囲であれば、均一な水分散体が得られる。
このようなアセチレンジオール系界面活性剤として具体的には例えば、下記一般式(1)で表される化合物、及び/又は下記一般式(2)で表される化合物を挙げることができる。
HLBが高いアセチレンジオール系界面活性剤は、耐熱性に優れる。
なお、本開示において、HLBは、グリフィン法により、次の算出式で定義される値である。
HLB値=20×[親水部の化学式量の総和]/分子量
中でも、N-エチル-2-ピロリドン、N-ブチル-2-ピロリドン、3-アルコキシ-N,N-ジメチルプロパンアミド、1,3-ジメチル-2-イミダゾリジノン、3-メチル-2-オキサゾリジノン、N-ホルミルモルホリン、N-アセチルモルホリン及びジメチルプロピレンウレアからなる群より選択される少なくとも1種であることがより好ましい。
上記合計量は、液体クロマトグラフィーにより測定する値である。
本開示の溶融性フッ素樹脂プライマーは、N-メチル-2-ピロリドン、N,N-ジメチルアセトアミド、N,N-ジメチルホルムアミド及びγ-ブチロラクトンのいずれを含まないことも好ましい。
上記アミン系酸化防止剤としては、例えば、フェニル基、ナフチル基等の芳香族性炭化水素基を分子中に有する芳香族アミンが挙げられ、例えば、N,N’-ジフェニル-p-フェニレンジアミン、N,N’-ジ-2-ナフチル-p-フェニレンジアミン、ジフェニルアミンとジイソブチレンとの反応生成物等のフェニレンジアミン系化合物;ジナフチルアミン、フェニル-α-ナフチルアミン、フェニル-β-ナフチルアミン、4,4′-ビス(α,α′-ジメチルベンジル)ジフェニルアミン、フェニルシクロヘキシル-p-フェニレンジアミン、スチレン化ジフェニルアミン等のその他の芳香族第2級アミン化合物等が挙げられる。
上記有機硫黄含有化合物としては、また、例えば、窒素原子に結合する水素原子の少なくとも1個が炭素数1~6の飽和又は不飽和の炭化水素基に置換されていてもよいチオ尿素が好ましく、チオ尿素、N,N′-ジエチルチオ尿素、N,N′-ジブチルチオ尿素、ジラウリルチオ尿素、N,N′-ジフェニルチオ尿素等のチオ尿素誘導体等であってもよい。
上記熱安定剤としては、1種又は2種以上を組み合わせて用いることができる。組み合わせて用いる場合、上述した熱安定剤の質量は、組み合わせた全ての熱安定剤の合計質量である。
本開示の溶融性フッ素樹脂プライマーは、金属又は非金属無機材料からなる基材上に直接塗布されるか、又は、耐熱性樹脂からなる層(以下、耐熱層ともいう)の上に塗布されることが好ましく、金属又は非金属無機材料からなる基材上に直接塗布されることがより好ましい。
本開示のプライマー皮膜は、被塗装物及び溶融性パーフルオロポリマー皮膜との密着性に優れる。
上記アルキルフェノール類の含有量は、液体クロマトグラフィーにより測定する値である。
本開示は、プライマー皮膜の上に、溶融性パーフルオロポリマーを含む皮膜が設けられた積層体でもある。
ただし、フッ素樹脂粒子の液体分散液を噴霧乾燥する工程を経て粉体塗料を製造する方法では、液体分散液を安定化させるための界面活性剤が粉体塗料、さらには、塗布された皮膜に残存することがある。このような場合には、パーフルオロポリマー皮膜の耐熱性や耐薬品性が損なわれるために好ましくない。
本開示の塗装物品は、上記プライマー皮膜と上記被塗装物及び上記パーフルオロポリマー皮膜との密着性に優れる。
特に、本開示は、金属基材上に上記積層体が設けられた塗装物品でもある。金属基材である、配管、パイプ、ダクト等の内面に上記積層体が設けられた塗装物品とすることが好ましい。
以下の実施例においては特に言及しない場合は、「部」「%」はそれぞれ「質量部」「質量%」を表す。
FEP粉末(MFR:20g/10min、平均粒子径:30μm)33.0g、耐熱性樹脂としてポリアミドイミド(PAI、昭和電工マテリアルズ社製)の粉砕物である平均粒子径1.5μmのPAI粒子10.0g、ポリオキシエチレンアルキルエーテル系界面活性剤(日油社製)、1.90g、アセチレンジオール系界面活性剤(日信化学社製)1.0g及び純水25.0gをステンレス容器に入れ、プロペラ攪拌機を用いて300rpmで20分間よく攪拌し、次いで、N-メチル-2-ピロリドン(NMP)20.0gを攪拌しながら添加しよく分散させて、FEP塗料用プライマーを得た。
FEP粉末36.1g、PAI粒子6.9gにすることのほかは、実施例1と同様にしてFEP塗料用プライマーを得た。
耐熱性樹脂としてポリアミドイミドの代わりにポリエーテルサルフォン(PES、住友化学社製)の粉砕物である平均粒子径5.0μmのPES粒子を用いることのほかは実施例1と同様にしてFEP塗料用プライマーを得た。
耐熱性樹脂としてポリアミドイミドの代わりにポリイミド(PI、三菱ガス化学社製)の粉砕物である平均粒径8.0μmのPI粒子を用いることのほかは実施例1と同様にしてFEP塗料用プライマーを得た。
ポリオキシエチレンアルキルエーテル系界面活性剤の添加量を6.0gにすることのほかには実施例1と同様にしてFEP塗料用プライマーを得た。
界面活性剤として、上記ポリオキシエチレンアルキルエーテル系界面活性剤のみを使用したこと以外は実施例1と同様にして、FEP塗料用プライマーを得た。
N-メチル-2-ピロリドン(NMP)の代わりに3-メトキシ-2-プロピオンアミドを使用したこと以外は実施例1と同様にして、FEP塗料用プライマーを得た。
アミン系酸化防止剤(大内新興化学社製)を0.5g追加すること以外は実施例1と同様にして、FEP塗料用プライマーを得た。
上記ポリオキシエチレンアルキルエーテル系界面活性剤に代えて、ポリオキシエチレンアルキルフェニルエーテル系界面活性剤(シグマアルドリッチジャパン社製)を使用したこと以外は実施例1と同様にして、FEP塗料用プライマーを得た。
FEP粉末41.0g、PAI粒子2.0gにすることのほかは、実施例1と同様にしてFEP塗料用プライマーを得た。
FEP粉末21.0g、PAI粒子22.0gにすることのほかは、実施例1と同様にしてFEP塗料用プライマーを得た。
FEP粉末の平均粒子径が5μmであること以外は実施例1と同様にしてFEP塗料用プライマーを得た。
(溶融性フッ素樹脂プライマーの密着試験)
脱脂された鉄基材(100mm×200mm×5mm)に80メッシュのアルミナとしてトサエメリー(宇治電化学工業社製)を0.5MPaの圧力でブラストを行い、エアーでブラスト粉を除去した上に、上記により得た溶融性フッ素樹脂プライマーをスプレーで乾燥膜厚が15~20μmとなるように塗装し、80℃で30分間乾燥させ、次いで、FEP粉体塗料(MFR:20g/10min、平均粒子径:40μm)を静電塗装し、320℃で30分間焼成を行い、約800μmの厚みの塗装膜を持つ塗装物を得た。この塗膜に10mm幅にナイフで筋目を入れ、島津社製オートグラフDSC-500を用いて50mm/分の速度で90度の剥離試験を行った。また、上記塗装物を98℃の沸騰水の中に24時間浸漬したものを用意し、同様の条件で剥離試験を行った。結果を表1に示す。
上記により得られた溶融性フッ素樹脂プライマーを100mlビーカーに80ml入れ撹拌直後、24時間後及び1週間後の粒子の沈降状態を目視及び樹脂棒を用いて評価を行った。結果を表1に示す。
沈降なし:目視で堆積がなく、樹脂棒で撹拌した際に底面に粒子成分の堆積がない。
やや沈降:目視では堆積がないが樹脂棒で撹拌した際に底面に粒子成分の堆積がある。
沈降あり:目視で堆積が認められ、樹脂棒で撹拌した際も底面に粒子成分の堆積がある。
上記により得られた溶融性フッ素樹脂プライマーを100mlビーカーに80ml入れ24時間及び1週間静置した溶融性フッ素樹脂プライマーを、樹脂棒を用いて撹拌し再分散評価を行った。結果を表1に示す。なお、評価を行っていない場合は、「-」と記載する。
良好:堆積した粒子が容易に均一に分散する。
不良:堆積した粒子が容易に均一に分散しない。
Claims (7)
- テトラフルオロエチレン/ヘキサフルオロプロピレン共重合体(FEP)粒子、耐熱樹脂、非イオン性界面活性剤及び水を含む溶融性フッ素樹脂プライマーであり、
前記FEPの平均粒子径が10~60μm、前記耐熱性樹脂は、ポリアミドイミド樹脂、ポリエーテルサルフォン及びポリイミド樹脂からなる群より選ばれる少なくとも1種であり、
前記FEP粒子と前記耐熱性樹脂との固形分質量比は50:50~95:5であり、
非イオン性界面活性剤は、ポリオキシエチレンアルキルエーテル系界面活性剤であり、
更に、アセチレンジオール系界面活性剤を含み、
水を質量基準で10~60%含む
ことを特徴とする溶融性フッ素樹脂プライマー。 - FEP粒子のメルトフローレートが0.1~50g/10分である、請求項1に記載の溶融性フッ素樹脂プライマー。
- 更に、FEP粒子の固形分に対して質量基準で0.001~5%の熱安定剤を含有する請求項1又は2に記載の溶融性フッ素樹脂プライマー。
- 請求項1~3のいずれかに記載の溶融性フッ素樹脂プライマーから形成されるプライマー皮膜。
- 請求項4に記載のプライマー皮膜の上に、溶融性パーフルオロポリマーを含む皮膜が設けられた積層体。
- 金属基材上に請求項5に記載の積層体が設けられた塗装物品。
- 金属基材が配管、パイプ又はダクトであり、その内面に請求項5に記載の積層体が設けられた塗装物品。
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