两种微交联羧甲基纤维素的结构和性能研究

在制备羧甲基纤维素（ＣＭＣ）过程中加入适量四硼酸钠或Ｎ－羟甲基丙烯酰胺（ＨＭＡＭ）使ＣＭＣ分子间发生微交联。阐述了有关的交联机理，研究了交联剂量对ＣＭＣ溶液性质的影响。结果表明，微交联工艺使ＣＭＣ溶液粘度、抗盐性和取代基分布均一性明显提高。与未交联ＣＭＣ比较，四硼酸钠用量３％—９％时，２％水溶液粘度提高２０％—６０％，盐粘比提高２３％—４９％，造浆率和滤失性也得到改进。用ＸＲＤ和ＩＲ对微交联ＣＭＣ结构进行了表征。

STUDY ON THE STRUCTURE AND PROPERTIES OF TWO MICROCROSSLINKED CARBOXYMETHYL CELLULOSES

An improved slurry process for preparing carboxymethyl celluloses(CMCs) is investigated. During the etherification of cellulose, intermolecule crosslinking was obtained by introducing optimum amount of borax or Nhydroxymethyl acrylamide(HMAM) as crosslinking agent. The crosslinking mechanism and the influence of the amount of crosslinking agent on the properties of microcrosslinked CMCs in solution are described. It has been found that by the microcrosslinking technique, the solution viscosity, saltresistance and the uniformity of substituent distribution of CMCs are obviously improved. When 3% to 9% of borax is introduced, the viscosities of 2% CMC aqueous solution are increased by 20% to 60% and the saltresistanceby 23% to 49%. The behavior of microcrosslinked CMCs in drilling mud and its fluid loss property are also discussed. The structure of microcrosslinked CMCs is characterized by XRD and IR spectra. The crosslinked CMC obtained by this method are valuable as viscosifier for drilling mud.