【摘要】 分别采用复合纤维素酶、内切纤维素酶和木聚糖酶3种酶对漂白针叶木纤维进行改性处理,比较不同的酶对漂白针叶木浆性能的影响。结果表明:复合纤维素酶对漂白针叶木浆性能影响较大,随着酶用量的增加,浆料滤水性先增加后下降,纤维保水值(WRV)和Zeta电位绝对值先降低后增加,纤维表面亲水性降低,纤维长度急剧下降,手抄片抗张指数先增加后急剧下降;在酶用量5.0 U/g时,纤维平均长度较对照样降低了48.64%,抗张指数较对照样下降了23.23%;内切纤维素酶和木聚糖酶对漂白针叶木浆的影响都比较小,改性处理后WRV和Zeta电位绝对值逐渐降低,但纤维表面亲水性增加,手抄片抗张指数也有所增加。对于造纸工业而言,内切纤维素酶的改性效果较好,当其用量为5.0 U/g时,纤维表面亲水性增加,有利于对纤维进行打浆处理,同时手抄片抗张指数增加到22.04 N·m/g,较改性处理前增加了20.77%。更多还原

【Abstract】 Complex cellulase,endo-cellulase and xylanase were applied to modify bleached softwood fiber( BSF). The influences of three enzymes on the performance of pulp were investigated. The results indicated that complex cellulase had the biggest influence on the performance of BSF among three enzymes. With the dosage of complex cellulase increasing,the pulp drainability first increased and then decreased. Both of water retention value( WRV) and the absolute value of Zeta potential decreased first and then increased. The hydrophilic of fiber surface reduced; the fiber length declined sharply; and the tensile index of hand-sheet increased first and then declined sharply. In the dosage of 5.0 U / g,compared with the sample without modification,the average fiber length was declined by 48. 64%,and the tensile index of hand-sheet decreased by 23. 23%. The effects of endo-cellulase and xylanase on the pulp were relatively small. After modification by these two enzymes,both of WRV and the absolute value of Zeta potential decreased gradually,but the hydrophilic of fiber surface and the tensile index of hand-sheet increased slowly. Endocellulase had the best modification effect for the paper industry. When the dosage of endo-cellulase was 5. 0 U / g,the hydrophilic of fiber surface increased. It was beneficial for fiber refining and the tensile index of hand-sheet increased to 22. 04 N·m / g by 20. 77%compared with the sample without modification.更多还原