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    • 21. 发明申请
    • PROCESSES FOR PRODUCING CELLULOSE NANOFIBERS, CELLULOSE OXIDATION CATALYSTS AND METHODS FOR OXIDIZING CELLULOSE
    • 生产纤维素纳米纤维的方法,纤维素氧化催化剂和用于氧化纤维素的方法
    • US20100282422A1
    • 2010-11-11
    • US12811046
    • 2008-12-25
    • Shoichi MiyawakiShiho KatsukawaHiroshi AbeYuko IijimaAkira Isogai
    • Shoichi MiyawakiShiho KatsukawaHiroshi AbeYuko IijimaAkira Isogai
    • D21C3/16D21H11/00B01J31/18
    • D21H17/25C08B15/02D21H11/18D21H11/20D21H19/34D21H21/18
    • The present invention aims to provide a process for producing cellulose nanofibers using a 4-hydroxy TEMPO derivative less expensive than TEMPO and a process capable of rapidly producing homogeneous cellulose nanofibers. Wood cellulose can be efficiently converted into nanofibers by a process for producing cellulose nanofibers comprising treating a cellulosic material with an oxidizing agent in water in the presence of a cellulose oxidation catalyst comprising an N-oxyl compound represented by formula 1 below: wherein R1 and R2 are each independently hydrogen or a C1-C6 straight or branched alkyl group; and (i) one of R4 or R5 is —OR, —OCOR or —OSO2R wherein R is a straight or branched carbon chain having 4 or less carbon atoms, and the other of R4 or R5 is hydrogen, and R3 and R6 are methyl, or (ii) R4 is hydrogen, and R5, R3 and R6 are taken together with a piperidine ring to form an aza-adamantane compound having formula 2 below: or a mixture thereof, and a compound selected from the group consisting of bromides, iodides and mixtures thereof to prepare oxidized cellulose, and microfibrillating the oxidized cellulose to convert it into nanofibers.
    • 本发明旨在提供使用比TEMPO便宜的4-羟基TEMPO衍生物的纤维素纳米纤维的制造方法以及能够快速制造均匀的纤维素纳米纤维的方法。 木质纤维素可以通过生产纤维素纳米纤维的方法被有效地转化成纳米纤维,包括在含有由下式1表示的N-氧基化合物的纤维素氧化催化剂存在下用氧化剂在水中处理纤维素材料:其中R1和R2 各自独立地为氢或C1-C6直链或支链烷基; 和(i)R4或R5中的一个是-OR,-OCOR或-OSO2R,其中R是具有4个或更少碳原子的直链或支链碳链,R4或R5中的另一个是氢,R3和R6是甲基 ,或(ii)R 4为氢,并且R 5,R 3和R 6与哌啶环一起形成具有下式2的氮杂 - 金刚烷化合物:或其混合物,以及选自溴化物, 碘化物及其混合物以制备氧化纤维素,并将氧化纤维素微纤化以将其转化成纳米纤维。