JP2011196008A - 無機繊維の製造方法 - Google Patents
無機繊維の製造方法 Download PDFInfo
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- JP2011196008A JP2011196008A JP2011038404A JP2011038404A JP2011196008A JP 2011196008 A JP2011196008 A JP 2011196008A JP 2011038404 A JP2011038404 A JP 2011038404A JP 2011038404 A JP2011038404 A JP 2011038404A JP 2011196008 A JP2011196008 A JP 2011196008A
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- inorganic fiber
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Abstract
【解決手段】水溶性の塩基性カルボン酸アルミニウムと水溶性のカルシウム化合物と水溶性または水分散性のケイ素化合物とを水性媒体中に溶解して紡糸原料水性溶液を作製した後、該紡糸原料水性溶液を紡糸して粗無機繊維を得、次いで、該粗無機繊維を焼成することにより、35質量%〜88質量%のAl2O3、3質量%〜45質量%のCaOおよび5質量%〜40質量%のSiO2を含み、Al2O3、CaOおよびSiO2を合計した含有割合が繊維全体の98質量%以上である無機繊維を製造することを特徴とする無機繊維の製造方法である。
【選択図】なし
Description
(1)水溶性の塩基性酸アルミニウムと水溶性のカルシウム化合物と水溶性または水分散性のケイ素化合物とを水性媒体中に溶解して紡糸原料水性溶液を作製した後、
該紡糸原料水性溶液を紡糸して粗無機繊維を得、
次いで、該粗無機繊維を焼成することにより、
35質量%〜88質量%のAl2O3、3質量%〜45質量%のCaOおよび5質量%〜40質量%のSiO2を含み、Al2O3、CaOおよびSiO2を合計した含有割合が繊維全体の98質量%以上である無機繊維を製造する
ことを特徴とする無機繊維の製造方法、
(2)前記上記水溶性の塩基性酸アルミニウムが、下記式(I)
Al(OH)XYZ (I)
(ただし、Xは0を超え3未満の正の数であり、Yは、Cl原子、NO3基、SO4基、RCOO基から選ばれるいずれか一種であり、Zは、YがCl原子、NO3基、RCOO基である場合3−X、YがSO4基である場合(3−X)/2であり、前記Rは水素原子または炭素数1〜10の炭化水素基若しくは水酸基含有炭化水素基であって、RCOO基が複数存在する場合、各Rは同一であっても異なっていてもよい)
で表される化合物から選ばれる一種以上である上記(1)に記載の無機繊維の製造方法、
(3)前記紡糸が静電紡糸法により行われる上記(1)または(2)に記載の無機繊維の製造方法、
(4)前記焼成する温度が、500℃以上液相生成温度未満である上記(1)〜(3)のいずれかに記載の無機繊維の製造方法、
を提供するものである。
Al(OH)XYZ (I)
(ただし、Xは0を超え3未満の正の数であり、Yは、Cl原子(塩素原子)、NO3基、SO4基、RCOO基(カルボキシル基)から選ばれるいずれか一種であり、Zは、YがCl原子、NO3基、RCOO基である場合3−X、YがSO4基である場合(3−X)/2であり、前記Rは水素原子または炭素数1〜10の炭化水素基若しくは水酸基含有炭化水素基であって、RCOO基が複数存在する場合、各Rは同一であっても異なっていてもよい)で表わされる化合物を挙げることができる。なお、こうした塩基性カルボン酸アルミニウムは、ヒドロキシ基で架橋された8面体配位のアルミニウム多核錯体(無機イオン性ポリマー)で、2量体やオリゴマーの形をとり得る。
Al2O3の含有割合が上記範囲内にあることにより、所望の耐熱性を得やすくなる。
CaOの含有割合が上記範囲内にあることにより、所望の生体溶解性を得やすくなる。
SiO2の含有割合が上記範囲内にあることにより、所望の耐熱性を得やすくなる。
無機繊維の平均繊維径が1μm以下であることにより、フィルター材及びシール材の構成材料として好適に使用することができる。平均繊維径が1μm以下である無機繊維は、上記静電紡糸法による静電紡糸時の雰囲気や印加電圧を調整したり、紡糸原料水性溶液の濃度や粘度を調整すること等によって製造することができる。
このため、例えば、平均繊維径が1μm以下の細繊維化物を、フィルター材及びシール材の構成材料等として、種々の産業分野で利用することができる。
なお、本出願書類において、無機繊維の融点は、上述した無機繊維組成を基に、熱力学平衡計算から求めた値を意味する。
得られた無機繊維のうち、評価試料として25 mgの範囲に収まる量を精秤した。
M=π×d2×L×ρ/4 (1)
また、無機繊維の表面積A(m2)は式(2)で表わされる。
A=π×d×L (2)
式(2)よりL=A/(π×d)であることから、このLを式(1)に代入してAについてまとめると、以下の式(3)のとおりとなる。
A=4M/dρ (3)
上記焼成時の温度および得られた無機繊維の組成(質量%およびモル%表示)を表2に示すとともに、得られた無機繊維の平均繊維径、溶解速度および融点を表3に示す。
得られる無機繊維中のAl2O3量、CaO量およびSiO2量が表2に示す割合になるように、紡糸原料水性溶液中の塩基性カルボン酸アルミニウム水溶液量、酢酸カルシウム水溶液量およびコロイダルシリカ量を調整するとともに、焼成温度(電気炉中で2時間保持した温度)を表3に示す温度にして、実施例1と同様にして無機繊維を作製した。
なお、比較例1においては、紡糸原料水溶液を作製し、粘度調整した段階で沈殿が生成したため、紡糸できなかった。
2 シリンジ
3 ノズル
4 高電圧発生装置
5 試料捕集台
Claims (4)
- 水溶性の塩基性酸アルミニウムと水溶性のカルシウム化合物と水溶性または水分散性のケイ素化合物とを水性媒体中に溶解して紡糸原料水性溶液を作製した後、
該紡糸原料水性溶液を紡糸して粗無機繊維を得、
次いで、該粗無機繊維を焼成することにより、
35質量%〜88質量%のAl2O3、3質量%〜45質量%のCaOおよび5質量%〜40質量%のSiO2を含み、Al2O3、CaOおよびSiO2を合計した含有割合が繊維全体の98質量%以上である無機繊維を製造する
ことを特徴とする無機繊維の製造方法。 - 前記上記水溶性の塩基性酸アルミニウムが、下記式(I)
Al(OH)XYZ (I)
(ただし、Xは0を超え3未満の正の数であり、Yは、Cl原子、NO3基、SO4基、RCOO基から選ばれるいずれか一種であり、Zは、YがCl原子、NO3基、RCOO基である場合3−X、YがSO4基である場合(3−X)/2であり、前記Rは水素原子または炭素数1〜10の炭化水素基若しくは水酸基含有炭化水素基であって、RCOO基が複数存在する場合、各Rは同一であっても異なっていてもよい)
で表される化合物から選ばれる一種以上である請求項1に記載の無機繊維の製造方法。 - 前記紡糸が静電紡糸法により行われる請求項1または請求項2に記載の無機繊維の製造方法。
- 前記焼成する温度が、500℃以上液相生成温度未満である請求項1〜請求項3のいずれかに記載の無機繊維の製造方法。
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WO2013114808A1 (ja) * | 2012-01-31 | 2013-08-08 | ニチアス株式会社 | 無機繊維及びその製造方法 |
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