纤维素酶提高竹溶解浆反应性能的研究  

Enhancement of Bamboo Kraft-based Dissolving Pulp Reactivity by Cellulase Treatment

作　　者：陈秋艳[1,2] 苗庆显[1] 马晓娟[1] 黄六莲[1] 

机构地区：[1]福建农林大学材料工程学院,福建福州350002 [2]福建农林大学生命科学学院,福建福州350002

出　　处：《西北林学院学报》2017年第5期208-212,288,共6页Journal of Northwest Forestry University

基　　金：国家自然科学基金(31500488);福建省自然科学基金面上项目(2015J01074);中央财政林业科技推广示范项目([2014]YC12);福建省产业技术联合创新专项([2014]514)

摘　　要：纤维素的反应性能在粘胶纤维的制备过程中发挥着重要作用。采用纤维素酶处理用以提高竹溶解浆的反应性能,考察酶用量、反应时间及浆浓度3个因素对聚合度、Fock反应性能、α-纤维素及竹浆得率的影响,揭示纤维素酶提高反应性能的机理。结果表明,在pH值4.6及温度55℃的环境下,纤维素酶处理的最优工艺条件为酶用量0.1U/g、反应时间60min、浆浓度5%,Fock反应性能由69.5%提高至88.2%,同时聚合度仅由643降至593。α-纤维素、得率和相对分子质量分布(MWD)也表明了纤维素酶处理可明显提高反应性能却仅有微小的聚合度下降。这些结果主要是由于酶的剥皮或侵蚀效应部分破坏了纤维素纤维的初生壁,形成了更多孔隙,导致浆料纤维可及度提高。比表面吸附仪、扫描电子显微镜(SEM)及凝胶渗透色谱仪(GPC)测试结果表明了纤维素纤维形态的改变,这支持了酶处理后浆料可及度提高的结论。Cellulose reactivity plays an important role in the production of viscose rayon. The eellulase treatment was adopted to improve the reactivity of bamboo dissolving pulp. The effects of cellulase dosage,reaction time and pulp consistency on the degree of polymerization,Fock reactivity,a-cellulose and pulp yield were studied in order to reveal the mechanism of the reactivity improvement. The results showed that cellu- lase dosage 0.10 U/g,enzymatic treating time 60 min,pulp consistency 5~ were chosen as the optimal con- ditions based on the conditions of pH 4.6 and temperature 55℃. As a consequence,promising results were obtained after the cellulase treatment. The Fock reactivity increased from 69. 5% to 88. 2% and only a modest cellulose degradation was obtained,while the degree of polymerization decreased only from 643 to 593. The results of other properties including a-cellulose,yield and molecular weight distribution also sup- ported these conclusions. These results were mainly due to the effects of etching or peeling of fibers prima- ry wall during the cellulase treatment,thus opening up cellulose structure and increasing the accessibility of fibers. The enhancement of accessibility of enzymatic treated pulp was supported by the test results from BET specific surface area, scanning electron microscope and gel permeation chromatography methods.

关 键 词：竹溶解浆 纤维素酶 反应性能 聚合度 可及度 

分 类 号：TQ351[化学工程]