摘要
以超临界CO_2为发泡剂,在连续挤出发泡过程中研究了超临界CO_2用量对高熔体强度均聚聚丙烯(PP)发泡成型过程的影响。随着超临界CO_2用量的增加,发泡挤出机口模压力降低,试样发泡倍率降低,泡孔尺寸变小,泡孔密度提高。在w(CO_2)为3%,5%时,得到发泡倍率最高为13左右的PP发泡材料。w(CO_2)为7%,发泡温度为123℃时,制备了孔径为10～30μm,泡孔密度为6.84×10~7个/cm^3的PP微孔泡沫塑料。
A kind of high melt strength homopolypropylene foaming material was prepared with supereritieal CO2 as blowing agent. The effect of supercritical CO2 content on the foaming process was studied in a continuous extrusion foaming process. The die pressure of the foaming extruder, expansion ratio and cell size of the samples decreased while the cell population density increased with the augmentation of the supereritieal CO2 content. Polypropylene（PP） foams with expansion ratio as high as 13 were obtained when the mass fraction of the supercritical CO2 were 3% and 5%. Microcellular PP foams with cell size in the range of 10-30 μm and cell population density of 6.84×10^7 eells/cm^3 were produced when setting the mass fraction of supercritical CO2 at 7% and temperature at 123 ℃, respectively.
出处
《合成树脂及塑料》
CAS
北大核心
2011年第3期13-16,共4页
China Synthetic Resin and Plastics
关键词
聚丙
烯超临界二氧化碳
发泡
挤出
polypropylene
supercritical carbon dioxide
foam
extrusion
