JP2021116490A - 再生セルロース繊維の処理方法及び処理された再生セルロース繊維 - Google Patents
再生セルロース繊維の処理方法及び処理された再生セルロース繊維 Download PDFInfo
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Abstract
Description
(1)表面に吸着物を有する再生セルロース繊維であって、当該吸着物にはセルロースナノファイバーが含まれる再生セルロース繊維。
(2)セルロースナノファイバーの重量割合が0.01wt%以上である上記の再生セルロース繊維。
(3)上記吸着物には更に樹脂が含まれる上記の再生セルロース繊維。
(4)上記の再生セルロース繊維を含む織編物。
(5)セルロースナノファイバーが分散したセルロースナノファイバー分散液中に再生セルロース繊維を浸漬してセルロースナノファイバーを吸着させるセルロースナノファイバー吸着工程と当該セルロースナノファイバーを吸着させた再生セルロース繊維を乾燥させる乾燥工程を含む再生セルロース繊維の防縮処理方法。
(6)セルロースナノファイバー分散液が樹脂成分を含む上記の再生セルロース繊維の防縮処理方法。
(7)上記乾燥工程の後に、更に樹脂成分を含む溶液中に再生セルロース繊維を浸漬する樹脂吸着工程を含む上記の再生セルロース繊維の防縮処理方法。
(8)上記再生セルロース繊維が織編物に加工されたものである上記の再生セルロース繊維の防縮処理方法
また、特に再生セルロース繊維を含む織編物に対してCNF吸着処理を行うことで、織編物内に存在する繊維の交錯箇所にもCNFが吸着し、繊維間で生じるズレが抑制されることが期待され、より効果的に防縮効果等を生じることができる。
上記浸染加工によりCNFを再生セルロース繊維等に吸着する場合には、CNF分散液中のCNFのほぼ全量を再生セルロース繊維等に吸着することが可能であるため、処理に係る再生セルロース繊維等の量と、目標とするCNF吸着量に応じた量のCNFを分散させた処理液を用いることができる。
例示的には、0.001%程度以上のCNFが存在する処理液中に再生セルロース繊維等を浸染し、又は当該処理液を用いてパディング加工を行うことで、再生セルロース繊維等に対して膨潤性の低下や、水洗い洗濯後の収縮量の低下等を生じさせることが可能である。
以下、実施例を用いて本発明を更に詳細に説明するが、本発明は以下の実施例によって限定されるものではない。
CNFによる繊維表面の吸着処理は、第一工業製薬(株)製のCNF含有水溶液(レオクリスタ I−2SP。CNF含有率;2.2wt%。以下、「原液1」ということがある。)に対して、原液1の2wt%に相当する量の分散剤(明成化学工業製、アルコゾールGL)を加えた後、各処理に使用する処理液(300ml)に含まれるCNF固形分重量が表1に記載の量になるように工業用水で希釈したものを処理液として用いた。なお、以下に説明するように、各処理液には10gの布地を浸漬するため、各実施例における布地に対するCNFの重量比は表1右欄に示す値となる。
つまり、以下に示すような再生セルロース繊維表面にCNFを吸着することで生じる効果を得るためには、必ずしもCNFが繊維表面に隙間無く吸着して皮膜を形成する必要はなく、繊維表面の一部を覆う程度にCNFが吸着することによって、繊維の膨潤や、その後の乾燥の際の収縮の程度を軽減可能であると考えられる。
CNFによる繊維表面の吸着処理は、日本製紙(株)製のCNF含有水溶液(セレンピア。CNF含有率;1.0wt%。「原液2」ということがある。)に、当該原液2に対して2wt%に相当する量の分散剤(明成化学工業製、アルコゾールGL)を加えた後、CNF固形分の重量割合が表5に示す条件になるように工業用水で希釈したものを処理液として用いた。また、表5中の「比較例2」については、工業用水を処理液として用いた。
表6に示すように、比較例2は湿潤時の膨張と乾燥後の収縮が顕著であるのに対して、CNFを用いた処理を行った実施例2−1〜5では寸法変化が抑制されていることが観察された。
樹脂加工処理:上記CNFの吸着処理を行った布地(実施例4−1)に対して、更にグリオキザール樹脂(DIC(株)製、ベッカミンN−80;1wt%,ベッカミンM−3;1wt%)と触媒(DIC(株)製、キャタリスト376;0.5wt%)、原液1に由来するCNFを0.5wt%含有する処理液を用いてパディング処理を行い、ウェットピックアップが100重量%となるようにロールで絞り、乾燥させた後、上記と同様のセット処理を行った(実施例4−2)。
Claims (8)
- 表面に吸着物を有する再生セルロース繊維であって、当該吸着物にはセルロースナノファイバーが含まれることを特徴とする再生セルロース繊維。
- セルロースナノファイバーの重量割合が0.01wt%以上であることを特徴とする請求項1に記載の再生セルロース繊維。
- 上記吸着物には更に樹脂が含まれることを特徴とする請求項1又は2に記載の再生セルロース繊維。
- 請求項1〜3のいずれかに記載の再生セルロース繊維を含むことを特徴とする織編物。
- セルロースナノファイバーが分散したセルロースナノファイバー分散液中に再生セルロース繊維を浸漬してセルロースナノファイバーを吸着させるセルロースナノファイバー吸着工程と、
当該セルロースナノファイバーを吸着させた再生セルロース繊維を乾燥させる乾燥工程を含むことを特徴とする再生セルロース繊維の防縮処理方法。 - セルロースナノファイバー分散液が樹脂成分を含むことを特徴とする請求項5に記載の再生セルロース繊維の防縮処理方法。
- 上記乾燥工程の後に、更に樹脂成分を含む溶液中に再生セルロース繊維を浸漬する樹脂吸着工程を含むことを特徴とする請求項5又は6に記載の再生セルロース繊維の防縮処理方法。
- 上記再生セルロース繊維が織編物に加工されたものであることを特徴とする請求項5〜7のいずれかに記載の再生セルロース繊維の防縮処理方法。
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