Production of a High-Functionality RBD Palm Kernel Oil-Based Polyester Polyol

摘要

A diol-based refined,bleached,and deodorized (RBD) palm kernel oil polyol was prepared.It was found that the polyurethane foam produced only gives a good compressive strength property at a 45 kg/m~3 molded density.The combination of sorbitol into the polyol system resulted in a better dimensional stability and improved thermal conductivity as well as enhanced compressive strength.These were obtained by increasing the functionality of the polyol (functionality of 4.5) through introduction of a high molecular weight and branching polyhidric compound.Direct polycondensation and transesterification methods were used for the reaction .A comparative study of the mechanical properties and morphological behavior was carried out with a diolbased polyol.From the waster-blown molded foam (zero ODP) with a density of about 44.2 kg/m~3 and a closed-cell content of 93%,a compressive strength of 222 kPa and a dimensional stability of 0.09,0.10,and 0.12% at the length,width,and thickness of the foam,respectively,conditioned at-15 deg C for 24 h,were obtainde.The thermal conductivity improved to an initial value of 0.00198 W/mK,tested at 0 deg C.