Verfahren zur Herstellung von wasserabsorbierenden, vernetzten, carboxalkyliertem, Zellstoff enthaltendem Material

摘要

A water absorbent cross-linked, carboxyalkylated cellulose-containing material is produced by impregnating a cellulose-containing material with an aqueous reaction solution including a carboxyalkylating agent, an alkali metal hydroxide, a cross-linking agent dissolved in water in an initial content of 50 to 90% by weight, a molar ratio of the carboxylating agent to glucose groups of cellulose being 0.7 to 2.0; adjusting the water content of the aqueous reaction solution impregnated in the cellulose-containing material to 20 to 60% by weight and 5% by weight below the initial water content by evaporating a portion of water; and subjecting the water content-adjusted cellulose-containing material to a simultaneous cross-linking and carboxylating reaction procedure at 50 to 110 DEG C, while maintaining the water content at 20 to 60%.