JP2020097750A - 成形材料の製造方法および成形品の製造方法 - Google Patents
成形材料の製造方法および成形品の製造方法 Download PDFInfo
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Abstract
Description
前記空気の露点が、−10℃以下であることが好ましい。
前記成形材料の水分含有量が、1質量%以下であることが好ましい。
前記フッ素樹脂が、フッ素化処理されたフッ素樹脂であることが好ましい。
前記フッ素樹脂が、テトラフルオロエチレン/パーフルオロ(アルキルビニルエーテル)共重合体および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種であることが好ましい。
前記成形材料が、パウダーまたはペレットであることが好ましい。
したがって、本開示における金属含有量には、成形材料の表面に存在する金属成分の量に加えて、成形材料の内部に含有される金属成分の量も含まれる。
CH2=CX5Rf3、CF2=CFRf3、CF2=CFORf3、CH2=C(Rf3)2
(式中、X5はHまたはF、Rf3はエーテル結合を含んでいてもよいフルオロアルキル基を表す。)で表される単量体が挙げられ、なかでも、CF2=CFRf3、CF2=CFORf3およびCH2=CX5Rf3で表される含フッ素ビニルモノマーが好ましく、HFP、CF2=CF−ORf4(式中、Rf4は炭素数1〜5のパーフルオロアルキル基を表す。)で表されるパーフルオロ(アルキルビニルエーテル)およびRf3が炭素数1〜8のフルオロアルキル基であるCH2=CX5Rf3で表される含フッ素ビニルモノマーがより好ましい。また、TFEおよびエチレンと共重合可能な単量体としては、イタコン酸、無水イタコン酸等の脂肪族不飽和カルボン酸であってもよい。上記ETFEは、TFEおよびエチレンと共重合可能な単量体単位が、0.1〜10モル%であることが好ましく、0.1〜5モル%であることがより好ましく、0.2〜4モル%であることが特に好ましい。
ダイヤフラムポンプの隔膜部、ベローズ成形品、電線被覆品、半導体用部品、パッキン・シール、コピーロール用薄肉チューブ、モノフィラメント、ベルト、ガスケット、光学レンズ部品、石油発掘用チューブ、地熱発電用チューブ、石油発掘用電線、サテライト用電線、原子力発電用電線、航空機用電線、太陽電池パネルフィルム、二次電池や電気二重層コンデンサーなどのガスケット、OAロール等。
成形材料の灰化分析は、国際公開第94/28394号に記載されている灰化法を用いて行った。すなわち、実施例および比較例で得られたペレットから、試料を2〜6mgの範囲で精秤し、グラファイト製のキュベット内にて、1100℃で180秒間加熱することにより灰化させて、原子吸光分光光度計(偏光ゼーマン原子吸光分光光度計(Z−8100)、日立製作所社製)にて分析した。
重合槽として、ガラスライニングされたオートクレーブを準備した。また、洗浄槽として、ガラスライニングされた洗浄槽を用いた。さらに、貯槽、配管などの、原料およびフッ素樹脂と接するその他の設備についても、PFAでライニングされた設備を用いた。
ガラスライニングされた重合槽および洗浄槽に代えて、PFAライニングされた重合槽および洗浄槽を用いた以外は、実施例1と同様にして、乾燥パウダーを得た。得られた乾燥パウダーを用いて、PFAの物性を測定したところ、実施例1と同様の物性を有するPFAであることが確認された。
熱風乾燥および移送に用いる空気として、エアドライヤーおよびULPAフィルター(捕集率:150nmの粒子に対して99.999%以上)を通過させた空気(露点が−15℃の乾燥空気)を用いた以外は、実施例2と同様にして、ペレットを得て、同様に評価した。結果を表1に示す。
熱風乾燥および移送に用いる空気として、エアドライヤーおよびULPAフィルター(捕集率:100nmの粒子に対して99.999%以上)を通過させた空気(露点が−15℃の乾燥空気)を用いた以外は、実施例2と同様にして、ペレットを得て、同様に評価した。結果を表1に示す。
重合槽および洗浄槽として、SUS317製の重合槽および洗浄槽を用い、また、貯槽、配管などの、原料およびフッ素樹脂と接するその他の設備についても、SUS317製の設備を用いた以外は、実施例1と同様にして、湿潤パウダーを得た。得られた湿潤パウダーを、実施例1と同様の方法により乾燥させて、乾燥パウダーを得た。
SUSの材質を、SUS317からSUS316に変更した以外は、比較例1と同様にして、乾燥パウダーおよびペレットを得て、同様に評価した。結果を表1に示す。
実施例1、比較例1および2で得られたペレットを、PFA製容器に入れた50質量%フッ酸に、25℃で24時間浸漬させた。
また、比較例3として、金属成分を比較的多く含有するが、その他の構成は比較例1および2で得られたペレットと同様であるペレットを準備して、フッ酸に同様に浸漬させた。
同時に、ペレットを浸漬させていないフッ酸も、25℃で24時間放置して、参照水溶液を調製した。
(1)溶融加工性を有するフッ素樹脂を含有し、灰化法により測定される金属含有量が100ng/1g以下である成形材料。
(2)前記フッ素樹脂のメルトフローレートが、1〜6g/10分である(1)に記載の成形材料。
(3)前記フッ素樹脂が、テトラフルオロエチレン単位と、ヘキサフルオロプロピレン単位、フルオロアルキルエチレン単位、パーフルオロ(アルキルビニルエーテル)単位およびエチレン単位からなる群より選択される少なくとも1種の単量体単位とを含有する共重合体である(1)または(2)に記載の成形材料。
(4)前記フッ素樹脂が、テトラフルオロエチレン/パーフルオロ(アルキルビニルエーテル)共重合体および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からなる群より選択される少なくとも1種である(1)〜(3)のいずれかに記載の成形材料。
(5)前記フッ素樹脂が、フッ素化処理されたフッ素樹脂である(1)〜(4)のいずれかに記載の成形材料。
(6)(1)〜(5)のいずれかに記載の成形材料からなるチューブ。
Claims (11)
- 溶融加工性を有するフッ素樹脂を含有し、灰化法により測定される金属含有量が100ng/1g以下である成形材料を得るための成形材料の製造方法であって、
前記フッ素樹脂の乾燥および移送に用いる空気として、清浄で、かつ、乾燥した空気を用いる製造方法。 - 前記空気が、300nmの粒子に対する捕集率が99.97%以上であるHEPAフィルターまたは150nmの粒子に対する捕集率が99.999%以上であるULPAフィルターを通過させた空気である請求項1に記載の製造方法。
- 前記空気の露点が、−10℃以下である請求項1または2に記載の製造方法。
- 前記成形材料の水分含有量が、1質量%以下である請求項1〜3のいずれかに記載の製造方法。
- 前記フッ素樹脂が、フッ素化処理されたフッ素樹脂である請求項1〜4のいずれかに記載の製造方法。
- 前記フッ素樹脂が、テトラフルオロエチレン/パーフルオロ(アルキルビニルエーテル)共重合体および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からなる群より選択される少なくとも1種である請求項1〜5のいずれかに記載の製造方法。
- 前記成形材料が、パウダーまたはペレットである請求項1〜6のいずれかに記載の製造方法。
- 純水中でフルオロモノマーを懸濁重合することにより、フッ素樹脂を含有する懸濁液を得る工程、
懸濁液から湿潤パウダーを回収する工程、
回収した湿潤パウダーを純水により洗浄する工程、および、
洗浄した湿潤パウダーを乾燥させて、乾燥したパウダーを得る工程
を含む請求項1〜6のいずれかに記載の製造方法。 - 乾燥したパウダーを成形してペレットを得る工程を含む請求項8に記載の製造方法。
- 請求項1〜9のいずれかに記載の製造方法により成形材料を得た後、前記成形材料を成形することにより成形品を得る成形品の製造方法。
- 前記成形品が、チューブである請求項10に記載の製造方法。
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