造纸污泥酶改性及其对制备PVC复合材料性能影响的研究

Effect of Enzymatic Modified Chemical Pulping and Papermaking Wastewater Sludge on the Properties of PVC Composite Filled with the Sludge

在分别采用漆酶、纤维素酶和半纤维素酶对化学制浆造纸污泥(CPPS)进行预水解处理的基础上,研究了酶改性CPPS作为填料对制备CPPS-聚氯乙烯(PVC)复合材料性能的影响。结果表明,酶预水解改性CPPS有利于改善CPPS-PVC复合材料的拉伸强度、弹性模量。填料用量为30%时,CPPS及漆酶、纤维素酶和半纤维素酶改性CPPS制备的CPPS-PVC复合材料的拉伸强度较CaCO_3-PVC复合材料分别提高了22.4%、63.2%、61.8%和43.6%;填料用量为40%时,CPPS及漆酶、纤维素酶和半纤维素酶改性CPPS制备的CPPS-PVC复合材料的弹性模量值较CaCO_3-PVC复合材料分别降低了26.6%、25.6%、21.9%和9.2%。添加填料可赋予PVC复合材料更好的热稳定性,而酶改性填料有助于促进CPPS-PVC复合材料的高温热稳定性,CPPS及其酶改性CPPS制备的CPPS-PVC复合材料与CaCO_3-PVC复合材料具有相似的热失重变化规律。

The chemical pulping and papermaking wastewater sludge hydrolyzed（ CPPS） by laccase,cellulase and hemicellulose under appropriate conditions was used as the filler to prepare the composite with polyvinyl chloride（ PVC）,the effects of enzymatic modified sludge on the properties of the composites were studied. Enzymatic modified sludge was useful to improve tensile strength,elastic modulus of the sludge-PVC composite. With the filler content of 30%,the tensile strength of PVC composites filled with raw sludge and its modified products hydrolyzed by laccase and cellulase and hemicellulose could be increased by 22. 4%,63. 2%,61. 8% and 43. 6% respectively compared with that of PVC composite filled with calcium carbonate. With the filler content of 40%,the elastic modulus of PVC composites filled with raw sludge and its modified products hydrolyzed by laccase and cellulase and hemicellulose could be decreased 26. 6%,25. 6%,21. 9% and 9. 2% respectively.Adding filler into PVC matrix could endow better thermal stability to PVC composites and enzymatic modification was helpful to promote the thermal stability of sludge-PVC composites in higher temperature range such as equal or more than 340℃. The composites filled with raw sludge and its enzymatic modified products had similar thermal gravimetric variation with calcium carbonate based PVC composite.