リファイナーメカニカルパルプを用いるカルボキシメチルセルロースの調製

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タイトル別名
  • Preparation of Carboxymethylcellulose from Refiner Mechanical Pulp
  • リファイナー メカニカル パルプ オ モチイル カルボキシ セルロース ノ チ

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抄録

Softwood refiner mechanical pulp (RMP) was carboxymethylated according to the standard method. The carboxyl content of carboxymethylated RMP (CM-RMP) was almost equal to that of linter cellulose carboxymethylated under the same condition (Table 1). Nevertheless, the water-soluble fraction consisting exclusively of carbohydrates (Table 2) comprised only one third of CM-RMP or less than one-half of carbohydrates in RMP (Table 1).<BR>The water-insoluble fraction has almost the same carboxyl content as the water-soluble fraction (Table 1), indicating that also carbohydrates in the water-insoluble fraction was highly carboxymethylated. In accordance with this result, hydrolysis of this fraction yielded non-carboxymethylated sugars in low yields (Table 2) and a complete delignification with chlorite made this fraction soluble into water (Fig. 2). Thus it may be concluded that lignin in RMP does not prevent the carboxymethylation of carbohydrates, but prevents the dissolution of carboxymethylated carbohydrates into water.<BR>The content of carboxymethylated carbohydrates with low DP in the water-soluble fraction of CM-RMP could be determined by the use of g.p.c. (Fig. 3). The viscosity of the water-soluble fraction of CM-RMP was equal to about half the viscosity of a commercial CMC, because of contamination with hemicellulose.

収録刊行物

  • 紙パ技協誌

    紙パ技協誌 35 (9), 798-804, 1981

    紙パルプ技術協会

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