CO2加合物替代HFC用于聚氨酯硬泡的发泡研究

CO2 Adducts Instead of HFC-365mfc as Blowing Agents for Polyurethane Foams

以辛基和聚丙二醇链（聚合度为3）接枝的聚乙烯亚胺的CO2加合物（C8-bPEI—CO，和PPG-bPEI-CO2）为发泡剂制备聚氨酯硬泡，研究其发泡性能，并和以HFC-365mfc（1，1，1，3，3．五氟丁烷）为发泡剂制备的泡沫的性能进行比较。结果表明，两种CO2加合物固体粉末发泡剂的发泡效率高，和相同质量的HFC-365mfc发泡效果相当。在泡孔均匀性和压缩强度方面，PPG—bPEI—CO，与HFC-365mfc几乎没有差别，C8-bPEI-CO2的泡沫稍差一些。CO，加合物为发泡剂的泡沫导热系数稍高，不过在尺寸稳定性和吸水率上可以和HFC-365mfc发泡的泡沫相当，甚至更好。降低导热系数将是以后研究的重点。

The CO2 adducts of hydrophobically modified polyethyleneimines（ R-bPEI-CO2） could release CO2 to blow polyurethanes during the exotherrnic polymerization. These CO2 releasing blowing agents were climate- friendly. In this study, two CO2 adducts with either octyl （ i.e. R = C8 ） or poly （ propylene glycol ） （ i.e. R = PPG, whose polymerization degree was 3） side chains were used to blow polyurethanes. The properties of the resultant foams were compared with those blown by HFC-365mfc（ CH3CF2CH2CF3 ）. The three blowing agents were compara- ble in decreasing the foam density at the same dosage by weight. The foams blown by PPG-bPEI-CO2 and HFC- 365mfe were similar in compressive strength and pore homogeneity, both being superior to those of the foams blown by G8-bPEI-CO2. The foams from both CO2 adduets possessed similar dimensional stability and lower water uptake, compared with the foams from HFC-365nffe. However, the thermal conductivity of the foams blown by CO2 adducts was higher than that of the foarns blown by HFC-365mfc. Future works should focus on how to lower the thermal conductivity of these climate-friendly foams.