超临界二氧化碳发泡热硫化硅橡胶的研究

摘要

The feasibility of silicone rubber foam prepared by supercritical carbon dioxide was investigated. Adopting the "precured-foamed-fully cured" process, the effect of the foaming temperature, pressure, swelling time and depressurization time on the density and foam structure of silicone rubber foam was studied. The foam structure was analyzed by scanning electron microscopy (SEM). The results showed that the silicone rubber foam with small pore size (＜100μm), uniform and controllable foam structure was formed by use of supercritical carbon dioxide.%对超临界二氧化碳制备硅橡胶泡沫材料的可行性进行了研究.采用“预硫化—发泡—完全硫化”工艺,研究了发泡温度、压力、溶胀时间、卸压时间等对硅橡胶泡沫的密度和泡孔结构的影响,通过扫描电子显微镜(SEM)对泡孔结构进行了分析.结果表明:利用超临界二氧化碳发泡热硫化硅橡胶,得到了泡孔孔径小(＜ 100μm)、泡孔均匀、泡孔结构可控的硅橡胶泡沫材料.