CO2 Adducts as Blowing Agents for Polyether-Based and Castor Oil-Based Polyurethanes
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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万方数据
维普
