以长链烷基改性的聚乙烯亚胺的CO2加合物(Cn-bPEI-CO2,n为烷基碳原子数,n=4~16)为气候友好发泡剂,以聚醚4110、聚合MDI等为原料制作了一系列硬质聚氨酯泡沫塑料.讨论了该发泡剂(可利用聚氨酯的聚合热来释放CO2作为发泡气相)与聚醚4110和蓖麻油多元醇的相容性和发泡性能.结果表明,C8-和C12-bPEI-CO2与聚醚多元醇的相容性最好,能分散形成半透明溶液.C8-bPEI-CO2发泡效率最高,得到的泡沫密度最低.加大发泡剂用量和用蓖麻油多元醇代替聚醚4110可以得到密度低、泡孔更均匀的聚氨酯硬泡.Cn-bPEI-CO2更适合于蓖麻油多元醇的发泡体系.%A series of CO2 adducts from alkyl grafted polyethyleneimines (Cn-bPEI-CO2, where thealkyl car-bon number n ranged from 4 to 16) as blowing agents, and polyether 4110 and polymeric 4,4′-diphenylmethanedi-isocyanate as the main ingredients, the rigid polyurethane foams were perpared. These new blowing agents could disperse into polyether polyols and released CO2 during the exothermal polymerization of polyurethanes. Among the blowing agents investigated, C8-and C12-bPEI-CO2 showed higher dispersibility than the other samples. The C8-bPEI-CO2 blown foams showed the lowest density at the same amount of blowing agent used. Increasing the blowing agent amount and replacing the polyether polyol with castor oil-derived polyol could obtain foams with lower density and more homogeneous pore size. Cn-bPEI-CO2 blowing agents were more suitable for castor oil-based polyurethanes than for polyether-based polyurethanes.
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