JP2011525571A - セルロース繊維及びその製造方法 - Google Patents
セルロース繊維及びその製造方法 Download PDFInfo
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- D06M11/82—Treating fibres, threads, yarns, fabrics or fibrous goods made from such materials, with inorganic substances or complexes thereof; Such treatment combined with mechanical treatment, e.g. mercerising with boron or compounds thereof, e.g. borides with boron oxides; with boric, meta- or perboric acids or their salts, e.g. with borax
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Abstract
・繊維をpH4.0〜10.0の範囲内で(特に水分及び/又は熱の影響下で)保管すると、架橋剤により誘導されるフィブリル化防止作用が変化する;
・pH4.0〜10.0の範囲内に最適値が存在し、保管中、最適値では架橋剤により誘導されるフィブリル化防止の安定性が最も高くなる;
・最適値の周辺に適当範囲が存在し、最適値での安定性と比較して、適当範囲では安定性が最大で20%低下する;
・pH4.0〜10.0の範囲内で適当範囲が少なくとも1つの制限値によって限定され、最適値での長期安定性と比較して、制限値では安定性が20%低下し、制限値の前後で更に低下する;
・架橋剤がpH値を変える機能を有する;
を示す。
本発明の繊維は適当範囲に緩衝する物質を含有し、適当範囲内で繊維1kgあたり少なくとも12mmol、好ましくは15〜70mmolの緩衝能力であることを特徴とする。
Description
・繊維をpH4.0〜10.0の範囲内で(特に水分及び/又は熱の影響下で)保管すると、架橋剤により誘導されるフィブリル化防止作用が変化する;
・pH4.0〜10.0の範囲内に最適値が存在し、繊維の保管中、最適値では架橋剤により誘導されるフィブリル化防止の安定性が最も高くなる;
・最適値の周辺に適当範囲が存在し、最適値での安定性と比較して、適当範囲では安定性が最大で20%低下する;
・pH4.0〜10.0の範囲内で適当範囲が少なくとも1つの制限値によって限定され、最適値での長期安定性と比較して、制限値では安定性が20%低下し、制限値の前後で更に低下する;
・架橋剤がpH値を変える機能を有する;
を示す。
a)架橋剤で処理した繊維をpH4.0〜10.0の範囲内で(特に水分及び/又は熱の影響下で)保管するとフィブリル化防止作用が変化するかどうか、
b1)pH4.0〜10.0の範囲内に、繊維の保管中、架橋剤により誘導されるフィブリル化防止の安定性が最も高くなる最適値が存在するかどうか、
b2)最適値の周辺に、最適値での安定性と比較して、安定性が最大で20%低下する適当範囲が存在するかどうか、
b3)pH4.0〜10.0の範囲内で適当範囲が少なくとも1つの制限値によって限定されるかどうか、ここで最適値での長期安定性と比較して、制限値では安定性が20%低下する、および
c)架橋剤がpH値を変える機能を有するかどうか
を満たす場合は、各架橋剤固有の適当なpH範囲に緩衝する緩衝剤を添加することによって、繊維のpH値を該適当範囲に維持でき、それによって保管中のフィブリル化防止作用の低下を遅らせることができると分かった。
1)温度
2)水分
3)繊維pH
に依存する。
測定方法:
繊維のpH値の測定方法:
この方法では、繊維を脱塩水(VE水)で処理し、続いてこの水のpH値を測定する。
原則:
当業者に公知の緩衝系(酢酸塩、クエン酸塩、リン酸塩、重炭酸塩、炭酸塩、ホウ砂等)から、4.0〜10.0のpH範囲で0.5pH単位ずつ異なるpH値を有する緩衝溶液を調製する。緩衝溶液は、少なくとも0.1mol/lの緩衝物質濃度を有し、調整pH値から0.8pH単位よりも大きく逸脱することがない緩衝系のpKaを有する。
まず、試験する架橋剤で処理した出発繊維のフィブリル化防止作用を、耐湿潤摩耗性(特許文献8記載の試験)に基づいて、少なくとも3回のパラレルな測定で判定する。耐湿潤摩耗性(「NSF」)の値はx U/dtex(回転/dtex)の単位で示し、良好なフィブリル化防止のためにはxは>450の値であるべきである。
この方法は、元々のNSFを測定した後、架橋剤で処理した各出発繊維に緩衝系を含浸させることを除いて、変形例1と同様である。上記と同様に、緩衝系は約0.1mol/lの各緩衝剤を含有し、0.5pH単位ずつpH値のグラデーションを有する4.0〜10.0のpH範囲である。後の絞り又は遠心処理によって、このように処理した全ての繊維が同様に高い溶液取り込み率(liquor pick-up)を示すことを確認する。その後、実験用乾燥器中で慎重に繊維を乾燥する(60℃、5時間)。
この目的では12週間の保管試験を行わなければならない。週に1度NSFを測定する。(平均湿度のベールを25℃で保管した場合と比較して、この試験の気候条件下では実質的に10倍はやくフィブリル化防止作用の変化が進行すると考えられる。)
この場合、底部の空間に脱塩水を満たした密封可能容器を系として用い、液体上に繊維を一定距離で載置する。凝縮現象を予防するために、繊維が壁等に接触しないよう注意を払う必要がある。系1)と同様に、この簡易試験は、2日おきにNSFを測定しながら、25日間で完了する。
本発明に従うと、繊維や繊維を含有する製品(ベール、糸、織物生地等)中で架橋剤が反応性基を含み、繊維を保管中及び/又は糸/織物集合体への典型的な湿潤及び/又は熱処理プロセス中に、緩衝剤無しで適当なpH範囲が放置される(left)というような方法で該反応性基が繊維のpH値を変化させ得る場合、緩衝物質を用いることにより架橋剤がその適当なpH範囲に保持される。
所定の架橋剤の適当範囲を決定した後、緩衝系による安定化および繊維の緩衝能力の決定のために、以下の手順をとることができる:
ちょうど1:10の溶液比率で、脱塩水を用いて繊維(任意に糸または織物生地の形態)を室温で1時間抽出する。繊維と抽出物を分離し、この抽出物のちょうど50ml分のアリコートを、まず0.01mol/lのHClを用いて、事前に決定した「制限値」よりもちょうど1.50単位低いpH値まで滴定する。その後、溶液を0.01mol/lのNaOHを用いて、「制限値」よりもちょうど1.50単位高いpH値まで滴定する。この3.00のpH単位内における0.01mol/lNaOHの消費量を、滴定曲線から読む。5mlが、繊維1kgあたり10mmolの緩衝能力に対応する。
ちょうど1:10の溶液比率で、脱塩水を用いて繊維(糸、生地)を室温で1時間抽出する。繊維と抽出物を分離し、この抽出物のちょうど50ml分のアリコートを、まず0.01mol/lNaOHで事前に決定した「制限値」よりもちょうど1.50単位高いpH値まで滴定する。その後、溶液を0.01mol/lHClで制限値よりもちょうど1.50pH単位低いpH値まで滴定する。この3.00のpH単位内における0.01mol/lHClの消費量を、滴定曲線から読む。5mlが、繊維1kgあたり10mmolの緩衝能力に対応する。
実施例1:
各例において同様に、先行技術に従って製造し、上記式(I)の架橋剤(2,4−ジクロロ−6−ヒドロキシ−1.3.5−トリアジンのナトリウム塩)を用いて架橋したリヨセル繊維を、以下の通り処理した:
例1b)(本発明に従って)−炭酸塩緩衝剤処理(Na2CO3/NaHCO3、モル比1:1、繊維に対して0.2%)、繊維pH値=10.2
例1c)(比較例)−未処理、繊維pH値=8.5
例1d)(比較例)−弱酸性繊維仕上げ剤処理、繊維pH値=6.7
例1b)(炭酸塩):10週
例1c)(緩衝剤無し):約7週
例1d)(酸性仕上げ剤):3週
2,4−ジクロロ−6−ヒドロキシ−1.3.5−トリアジンのナトリウム塩に関して、上記方法によって、pH8.5に、それ未満のpH値ではフィブリル化防止の保存安定性が悪化する「制限値」が存在することを決定した。
NaOH消費量(ml)*0.01*1000/5=緩衝剤量(mmol)/繊維量(kg)
試料1:繊維1kgあたり2gのホウ砂で処理した繊維
試料2:繊維1kgあたり3.5gのホウ砂で処理した繊維
試料3:繊維1kgあたり12gのホウ砂で処理した繊維
試料4:繊維1kgあたり6gのホウ砂で処理した繊維
試料5:繊維1kgあたり1.5gの炭酸ナトリウムで処理した繊維
試料6:繊維1kgあたり1gの炭酸ナトリウムで処理した繊維
試料7〜11:各場合の緩衝物質で未処理の繊維の試料
Claims (17)
- 架橋剤で処理したリヨセル系セルロース繊維であって、
架橋剤は繊維のフィブリル化を防止し、下記特性:
・繊維をpH4.0〜10.0の範囲内で(特に水分及び/又は熱の影響下で)保管すると、架橋剤により誘導されるフィブリル化防止作用が変化する;
・pH4.0〜10.0の範囲内に最適値が存在し、繊維の保管中、最適値では架橋剤により誘導されるフィブリル化防止の安定性が最も高くなる;
・最適値の周辺に適当範囲が存在し、最適値での安定性と比較して、適当範囲では安定性が最大で20%低下する;
・pH4.0〜10.0の範囲内で適当範囲が少なくとも1つの制限値によって限定され、最適値での長期安定性と比較して、制限値では安定性が20%低下し、前記値の前後で更に低下する;
・架橋剤がpH値を変える機能を有する;
を示し、
繊維は適当範囲に緩衝する物質を含有し、適当範囲内で繊維1kgあたり12mmol以上、好ましくは15〜70mmolの緩衝能力を示すことを特徴とするセルロース繊維。 - 繊維が適当範囲内のpH値を示すことを特徴とする、請求項1に記載のセルロース繊維。
- 緩衝物質又は任意に用いられる複数の緩衝物質のうち少なくとも1つが、適当範囲内又は適当範囲からpH1単位以下だけ外れた範囲内のpKa値を有することを特徴とする、請求項1又は2に記載のセルロース繊維。
- 繊維が8.5〜10.5のpH値を示すことを特徴とする、請求項4に記載のセルロース繊維。
- 前記緩衝物質又は任意に用いられる複数の緩衝物質のうち少なくとも1つが、8.0〜11.0のpKa値を有することを特徴とする、請求項4または5に記載のセルロース繊維。
- 緩衝物質が、ホウ砂;アルカリ金属イオン、アンモニウム、又は置換アミン由来カチオンの炭酸塩又は重炭酸塩;アルカリ金属イオン、アンモニウム、又は置換アミン由来カチオンのリン酸塩、リン酸水素塩、又はリン酸二水素塩;アンモニア;置換アミン;グアニジン又はグアニジン塩;およびそれらの混合物、カルボン酸との混合物、ならびにそれらの塩からなる群から選ばれることを特徴とする、請求項4〜6のいずれか一項に記載のセルロース繊維。
- 緩衝物質として、ホウ砂を少なくとも繊維1kgあたり1525mgの濃度で含有することを特徴とする、請求項7に記載のセルロース繊維。
- 緩衝物質として、ホウ砂を繊維1kgあたり2860mg〜14000mgの濃度で含有することを特徴とする、請求項8に記載のセルロース繊維。
- 緩衝物質として、炭酸水素ナトリウム/炭酸ナトリウム緩衝系を少なくとも繊維1kgあたり848mg以上の濃度(炭酸ナトリウム換算)で含有することを特徴とする、請求項7に記載のセルロース繊維。
- 緩衝物質として、炭酸水素ナトリウム/炭酸ナトリウム緩衝系を前記繊維1kgあたり1580mg〜7420mgの濃度(炭酸ナトリウム換算)で含有することを特徴とする、請求項10に記載のセルロース繊維。
- 繊維水分(fibre moisture)が8%〜10%であることを特徴とする、請求項1〜11のいずれか一項に記載のセルロース繊維。
- 請求項1〜13のいずれか一項に記載のセルロース繊維を含有する、セルロース繊維ベール。
- 請求項1〜13のいずれか一項に記載のセルロース繊維を含有する糸、織物、編物、組物、及びメリヤス。
- 請求項1〜13のいずれか一項に記載のセルロース繊維を製造する方法であって、適当なpH範囲に緩衝する物質をリヨセル系セルロース繊維に適用する工程を含むことを特徴とする方法。
- 前記セルロース繊維の製造中、ベール状にプレス成形する前に緩衝物質を適用することを特徴とする、請求項16に記載の方法。
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