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    • 3. 发明申请
    • METHOD OF MAKING CARBOXYLATED CELLULOSE FIBERS AND PRODUCTS OF THE METHOD
    • 制备羧甲基纤维素纤维的方法及其制备方法
    • WO01029309A1
    • 2001-04-26
    • PCT/US2000/027837
    • 2000-10-06
    • C08B15/04D06M11/00D06M11/07D06M11/13D06M11/80D06M13/322D06M13/355D06M23/00D21C9/00D21H11/20D21H13/04
    • D06M13/388C08B15/04D21C9/004D21C9/005D21H11/20
    • The invention is directed to a method of making carboxylated cellulose fibers whose fiber strength and degree of polymerization is not significantly sacrificed. The method involves the use of cyclic nitroxide free radical compounds as a primary oxidant and a hypohalite salt as a secondary oxidant in an aqueous environment. Preferably the oxidized cellulose is then stabilized against D.P. loss in alkaline environments and color reversion with a reducing agent such as sodium borohydride. Alternatively it may be treated with an oxidant such as sodium chlorite. The method results in a high percentage of carboxyl groups located at the fiber surface. The product is especially useful as a papermaking fiber where it contributes strength and has a higher attraction for cationic additives. The product is also useful as an additive to recycled fiber to increase strength. The method can be used to improve properties of either virgin or recycled fiber. It does not require high alpha -cellulose fiber but is suitable for regular market pulps.
    • 本发明涉及一种制备纤维强度和聚合度不被显着牺牲的羧化纤维素纤维的方法。 该方法包括在水性环境中使用环状氮氧自由基化合物作为主要氧化剂和次卤酸盐作为次级氧化剂。 优选地,氧化的纤维素然后对抗D.P. 在碱性环境中的损失和还原剂如硼氢化钠的颜色反转。 或者也可以用氧化剂如亚氯酸钠处理。 该方法导致位于纤维表面的羧基的高百分比。 该产品作为造纸纤维特别有用,其中它提供强度并且对阳离子添加剂具有更高的吸引力。 该产品还可用作再生纤维的添加剂以增加强度。 该方法可用于改善原始纤维或再生纤维的性能。 它不需要高的α-纤维素纤维,但适用于常规市场纸浆。