KOH与NaOH浸渍麦草化学机械法制浆性能比较

Comparison of Chemical Mechanical Pulping Properties of Wheat Straw Impregnated with KOH and NaOH

探究了KOH与NaOH在用碱量3%~7%(以KOH计)与浸渍时间10~80 min的不同条件对麦草化学机械浆及所抄纸张物理化学性能的影响。结果表明,在常压、浸渍温度95℃的温和条件下,KOH浸渍的麦草化机浆与NaOH浸渍的麦草化机浆相比,具有更高的紧度和强度。在浸渍过程中,由于KOH具有较强的脱木素能力,纸浆得率下降较多;KOH碱性较强,导致残液的pH值较高。KOH比NaOH破坏麦草纤维素结晶区的能力更强,因此其浸渍后的麦草浆中纤维形态较NaOH浸渍后的纤维形态更优。

In this study,the effects of different pulping conditions were investigated including KOH and NaOH dosages of 3%~7%(KOH basis)and immersion times of 10~80 min on the physical and chemical properties of wheat straw chemical mechanical pulp and paper.The results showed that under normal pressure and a mild immersion temperature of 95℃,the wheat straw chemical mechanical pulp impregnated with KOH had higher tightness and strength than that impregnated with NaOH.During the impregnation process,due to the strong delignification ability of KOH,the pulp yield of wheat straw chemical mechanical pulp impregnated with KOH was lower.KOH was relatively alkaline,resulting in a higher pH value of the residual liquid.In addition,KOH had a stronger ability to destroy the crystallization zone than NaOH,so the fiber morphology of the wheat straw pulp with KOH impregnation was better than that with NaOH impregnation.