摘要
采用超临界二氧化碳作为物理发泡剂,进行软质聚氯乙烯(PVC)的发泡试验研究。探讨了实验过程中主要助剂用量对发泡材料的宏观性能和微观泡孔结构的影响。结果表明,当PVC用量为100份,交联剂为0.5份,泡孔调节剂为6份时,发泡材料各项性能较为优异。添加了成核剂纳米Ca CO3后,相比于纯PVC发泡体系,发泡材料的表观密度都有所减小,当成核剂含量为5份时,发泡材料的表观密度最小,为0.294 g/cm3,发泡倍率最大为3.873倍。材料微观的泡孔分布更为均匀,泡孔密度提高到原来的近3倍,泡孔的平均直径较没有添加成核剂的体系缩小了近一半,平均孔径为35.7μm。
The foaming experiments of polyvinyl chloride（PVC） were done with taking supercritical carbon dioxide（sc-CO2） as foaming agent. PVC foams were made by different contents of additives,to research their contents on the morphology and material properties of the foams. The results show that the foaming materials possessed excellent properties when the content of PVC, cross-linking agent and cell regulator is 100 phr, 0.5 phr and 6 phr respectively. After adding nano-CaCO3,compared with pure PVC foam system,the apparent density of foam materials is reduced,as nuclear agent content is 5 phr,the foamed material’s apparent density is smallest（0.294 g/cm3）,foaming rate is biggest（3.873）. Micro bubble hole distribution is more homogeneous,bubble hole density can be up to above three times,bubble hole of average diameter compared with not adding nucleating agent system is reduced nearly 50%and the average hole diameter is 35.7 microns.
出处
《工程塑料应用》
CAS
CSCD
北大核心
2015年第2期95-100,共6页
Engineering Plastics Application
关键词
超临界CO2发泡
发泡倍率
性能
PVC
PVC
supercritical CO2 foaming
foaming ratio
property
