漆酶/天冬氨酸生物体系处理改善旧瓦楞纸纤维性能

The Improvement of Fiber Properties of OCC by Laccase/Aspartic Acid Biological System

利用漆酶/天冬氨酸体系对旧瓦楞纸(OCC)进行纤维改性,以提高OCC再生纸的物理性质,降低或避免OCC回用过程中的性能衰减。实验结果表明,漆酶/天冬氨酸体系处理OCC能明显提高其性能,最佳处理条件为漆酶200 mg(活性2000 U/g)、天冬氨酸1%(相对于绝干浆)、p H 5、反应温度40℃、反应时间2 h。最佳处理条件下的改性OCC再生纸相比于空白样而言,其抗张指数、撕裂指数、耐破指数分别提高了127. 91%、40. 05%、19. 74%。漆酶/天冬氨酸改性后的纤维酸不溶木素的含量比空白样纤维的酸不溶木素的含量降低了48. 40%。傅里叶变换红外光谱结果显示改性后OCC纤维素的红外结晶度指数相比于处理前有所降低。

The fiber modification of the old corrugated cardboard （OCC） was made by using the laccase/aspartic acid system, in order to improve the physical properties of OCC recycled paper and to reduce or avoid the performance attenuation in the process of OCC reuse. Experimental resuhs showed that using the laccase/aspartic acid system treatment OCC can significantly improve the performance of fiber. The optimum processing conditions for experience was lacease 200 mg （enzymatic activity is 2000 U/g）, aspartic acid 1% （ relative to the absolute dry pulp ）, pH 5, reaction temperature 40 ~C, reaction time 2 h. Under optimum treatment conditions, compared with the control sample, the modified OCC pulp with the best condition, its tensile, tearing and burst indexes were improved by 127.91% , 40. 05% and 19. 74% , respectively. The insoluble lignin of the modified OCC fiber was reduced by 48.4% , compared with the control sample. The infrared crystallinity index N. O ＇KI of the modified OCC cellulose obtained by fourier infrared spectroscopy （FTIR） was lower than the control sample.