废纸浆/HDPE复合发泡材料的流变行为及发泡形态  

Rheological behavior and cell morphology of foamed waste paper pulp/HDPE composites

作　　者：曾广胜[1,2] 许超[1,2] 刘跃军[1,2] 瞿金平[3] 

机构地区：[1]湖南工业大学包装新材料与技术中国包装总公司重点实验室,湖南株洲412008 [2]湖南工业大学先进包装材料与技术湖南省普通高校重点实验室,湖南株洲412008 [3]华南理工大学聚合物新型成型装备国家工程研究中心,广东广州510640

出　　处：《化工学报》2011年第9期2643-2650,共8页CIESC Journal

基　　金：湖南省自然科学基金项目(09JJ6083);国家科技部中小企业技术创新基金项目(09C26214301937);湖南省教育厅科技计划(08C278);湖南省高校科技成果产业化培育项目(09CY016)~~

摘　　要：将废旧瓦楞纸板粉碎制浆,与HDPE(高密度聚乙烯)通过模压成型制备了废纸浆/HDPE发泡复合材料。利用英国Rosand双料筒毛细管流变仪,在线研究了发泡剂AC含量、废纸浆含量、温度以及吸热、放热和平衡发泡剂对废纸浆/HDPE复合发泡材料的流变行为的影响,并在SEM下观察了不同AC含量和废纸浆含量对发泡形态的影响。结果表明:废纸浆/HDPE复合发泡材料熔体表现为假塑性流动特征,当剪切速率达到600s-1时,出现管壁滑移现象。发泡剂AC能明显降低熔体黏度,随着AC含量的增加,熔体黏度下降。随着废纸浆含量的增加,熔体黏度增加。当剪切速率小于275s-1时,随着温度的升高,熔体黏度降低;当剪切速率大于275s-1时,熔体黏度反而随着温度的升高而升高。当剪切速率小于325s-1时,吸热型发泡剂(NaHCO3)熔体黏度最高;当剪切速率大于325s-1时,放热型发泡剂AC熔体黏度最高。通过SEM观察发现,随着发泡剂AC含量的增加,泡孔数量增加,孔径变小;随着废纸浆含量的增加,泡孔数量减小,孔径增大,泡孔合并现象严重。Waste corrugated board was ground to paper pulp,which was used to prepare the foamed waste paper pulp/high density polyethylene（HDPE）composites by compression molding with HDPE.The Rosand double-barrel capillary rheometer was used to study the influences of the blowing agent AC （azodicarbonamide）content,waste paper pulp content,temperature and different blowing agents on the melt of the composites.Scanning electron microscopy（SEM）was also used to observe the effects of different contents of AC and waste paper pulp on cell morphology.The results showed that the melt behavior of the foamed waste paper pulp/ HDPE composites was pseudoplastic flow,and when shear rate was up to 600 s^-1 wall slip was observed.The viscosity of the melt was significantly reduced with increasing content of AC,but increased with increasing content of waste paper pulp.When shear rate was reduced to 275 s^-1 or below,the viscosity of the melt was reduced as temperature increased;while when shear rate went up to 275 s^-1 or higher,the viscosity of the melt increased as temperature increased.When shear rate was reduced to 325 s^-1 or below,the melt with endothermic blowing agent（NaHCO3）showed the highest viscosity;when shear rate went up to 325 s^-1 or higher,the melt with exothermic blowing agent AC showed the highest viscosity.The number of cell increased and the size of cell became smaller with increasing AC content,but the number of cell was reduced and the size of cell became larger with increasing content of waste paper pulp as observed by SEM.

关 键 词：木塑 HDPE 发泡 流变 泡孔 

分 类 号：TQ321.5[化学工程—合成树脂塑料工业]