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采用漆酶、纤维素酶和半纤维素酶,对旧瓦楞箱纸板(OCC)纸浆进行酶改性处理,研究了酶协同作用对OCC浆强度性能的影响。结果显示,当处理条件pH值7.3、温度45℃、浆浓3%、时间2h时,三种酶单独处理OCC浆料的最佳酶用量分别为:漆酶16U·g-1,通空气;纤维素酶2U·g-1;半纤维素酶5U·g-1。与空白样比较,采用纤维素酶、漆酶的两段处理,干环压指数提高27%,干、湿抗张指数分别提高18%和54%,湿环压指数提高14%。采用扫描电子显微镜(SEM)分析技术,对几种酶处理的OCC浆手抄片纤维表面形态变化进行了观察分析,结果表明,漆酶与纤维素酶或半纤维素酶协同作用处理样,纤维表面更加粗糙,纤维间黏合较漆酶单独处理增加。
Laccase, cellulase and hemicellulase were used to modify OCC pulps. The effect of enzyme synergism on the strength properties of OCC pulp was studied. The results showed that when the treatment conditions pH 7.3, temperature 45 ℃, slurry concentration 3%, time 2h, the optimum enzyme dosage of the three enzymes were: laccase 16U · g-1, through the air; Cellulase 2U · g-1; Hemicellulase 5U · g-1. Compared with the blank samples, the dry-ring pressure index increased by 27% and the wet and dry tensile index increased by 18% and 54% and the wet-ring pressure index increased by 14% with the treatment of cellulase and laccase. Scanning electron microscopy (SEM) analysis technique was used to observe the surface morphological changes of several enzyme-treated OCC pulp hand-laid fibers. The results showed that the laccase and cellulase or hemicellulase treated synergistically with the fiber The surface is rougher, the adhesion between the fibers is higher than the laccase alone.