纤维素酶处理对麦草APMP浆性能的影响

Effects of Cellulase Treatment on Wheat Straw APMP

关键词:  纤维素酶  麦草APMP浆  纤维形态  物理性能

Key Words:cellulase  wheat straw APMP  fiber morphology  physical properties

摘要:实验采用纤维质量分析仪、扫描电镜和X射线衍射分析了纤维素酶预处理前后麦草APMP浆纤维形态及纤维素结晶度的变化。结果表明，纤维素酶的最佳处理条件为：温度60℃、酶用量6 IU/g 绝干浆、pH值5.0～6.0；与未处理浆相比，经纤维素酶处理后麦草APMP浆的细小纤维含量下降，纤维的平均长度、扭结指数和卷曲指数增加；纤维表面变得光滑，纤维更为柔软；成纸的撕裂指数、抗张指数、耐破指数和紧度分别增加了7.6%、9.3%、15.1%和10.1%。

Abstract:Physical properties of alkline peroxide mechanical pulp (APMP) of wheat straw were modified by cellulase. The fiber morphology and cellulose crystallinity before and after treatment with cellulase were analyzed by fiber quality analyzer (FQA)，environment scanning electron microscope (ESEM) and X-ray diffraction (XRD). The results showed that the optimal treatment conditions are temperature 60℃, cellulase dosage 6 IU/g and pH value 5.0~6.0. Compared with the control pulp, tearing index, tensile index, burst index and density of the treated pulp increase by 7.6%, 9.3%, 15.1% and 10.1% respectively. The fines content of the pulp treated by cellulase decrease, and the length, kink index and curl index of the treated fiber increase. ESEM results revealed that the smoothness and the softness of the treated fiber are improved. From XRD analysis, the crystallinity of the treated fiber increase by 3.14%. The results showed that cellulase treatment has an obvious influence on fiber morphology and physical properties of the pulp.