Properties of Rigid Polyurethane Foams Prepared with Synthesized PIPA Polyol

摘要

Polyisocyanate polyaddition (PIPA) polyol was synthesized in laboratory. Fourier transform infrared spectrometry (FTIR) and gel permeation chromatography (GPC) were employed to characterize the PIPA polyol and the best synthetical formula was found. The rigid polyurethane foams blown by water were made from the mixture of PIPA polyol and low hydroxyl number polyol. How the controlling variables such as the ratio of two kinds of polyols, surfactant, chain growth and cross linking, and isocyanate index affected the properties of the foams were studied with the scanning electron microscopy (SEM), mechanical testing and rheological testing. When the amounts of surfactant, 1, 4-butanediol, trimethylolpropane and TMN-3050 polyol were respectively 1.0 php, 1.0 php, 1.0 php, and 15 php, and the isocyanate index was 1.15, the cells were well-proportioned and close, the cell size and foaming time were moderate, and the foams performed the best strength and toughness.