生物酶催化交联提高纸板湿强度的研究

Effect of crosslink of unbleached straw KP catalyzed by laccase on wet strength of paperboard

木素-碳水化合物复合体(LCC)是植物细胞壁的重要组成部分,木素和碳水化合物之间的交联赋予了木材和植物茎杆的物理强度和抗生物降解性能。但用植物组织制成纸浆后,其大部分LCC和细胞壁不再存在,重新交织形成的纸板的强度远远低于原本木材和植物茎杆的强度,尤其是湿强度。本研究拟通过在纸板中模拟生物合成木素脱氢聚合物(DHP)和LCC的方法,使得纸板中的纤维之间产生类似于复合胞间层的结构,在一定程度上实现植物纤维细胞的胞间层的修复。结果表明:利用木素前驱物松柏醇葡萄糖苷处理后的纸板湿强度大幅度提高,最多提高了2.51倍,但对纸张的干强度没有明显提高。纸板的后续高温干燥处理,能明显提高纸张的湿强度,湿强度从3.27N.m/g提高到10.20N.m/g,但对干强度影响不大。随着松柏醇葡萄糖苷量的增加,未漂浆的卡伯值也随着增加。

Lignin-carbohydrate complexes（LCC） constitutes an important part of the plant cell wall.With the existence of the LCC,the stem strength and physical properties of anti-biodegradable are well enhanced.But the LCC won＇t exist anymore when when pulping,then the strength of the paperboard will be much less than that of the origin plant stem,especially the wet strength.In this sdudy,a structure similar to middle lamella was produced between fibers to realize the repairation of middle lamella of fibers,by simulation of producing lignen dehydrogenation polymer（DHP） and lignen-carbonhydrate complex（LCC） biologically.The results show that the wet strength of paperboard is reatly increased after unbleached KP is reated with coniferin.The wet strength is mostly enhanced by 2.51 times compared to untreated paperboard,whereas the dry strength of paper having no significant change.After the following heat treatment,the wet strength of paper is increased from 3.27 N·m/g to10.20 N·m/g,while the dry strength having little change.The Kappa number of unbleached KP increases with the increase of oniferin dosage.