Effect of fluff pulp characteristics on the efficiency of gas grafting by fatty acid chloride

초록

Gas grafting induces esterification between fatty acid chloride and polar group of cellulose, such as hydroxyl groups. Main factors of gas grafting reaction includo reaction conditions such as reaction time, concentration, and temperature as well as characteristics of raw material. In this study, different kinds of pulp were used as raw materials of gas grafting in order to investigate the influence of pulp types and fiber length on the reaction efficiency. Pulp fibers grafted did not absorb water regardless of pulp types and fiber length distribution. Reacted fatty acid chloride contents of Sw-BKP was lower than those of BCTMP and DIP. However, Sw-BKP showed the best efficiency of gas grafting due to the lowest formation of residual fatty acid chloride. According to the decrease in fiber length, total amount of fatty acid chloride involved in gas grafting was increased. Un-reacted fatty acid chloride resulted in increase in free fatty acid residue. In case of fractionated BCTMP. un-reacted fatty acid chloride and total used fatty acid chloride during gas grafting reaction of BCTMP, which had passed 100 mesh screen, dramatically increased. Furthermore, it was assumed that short fiber length and high amount of fines had adverse effects on the efficiency of gas grafting.

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