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In rigid foams, the use of biopolyols instead of petroleum-based polyols will have a negative impact on foam performance
.
One solution is to use additives to improve the performance of biopolyols
A research team at the Missouri University of Science and Technology studied the role of additives in the structure and thermal insulation of these foams
.
In this research partly funded by the Missouri Soybean Marketing Board and the United States Department of Agriculture, soy-based polyols were used to make rigid polyurethane foam
.
The study evaluated cell size, density, thermal resistance, and compression deflection and compared it with Covestro’s petroleum-based foam Baydur 683
The study also evaluated the effects of catalysts, blowing agents, surfactants, and polyols with different functionalities
.
In this case, they used dibutyltin dilaurate as a catalyst and water as a blowing agent
They determined that the foam produced by 5g of surfactant per 100g of polyol has the smallest surface tension and the highest thermal resistance, with an R value of 26.
11m2K/W
.
Conversely, CFD values are negatively affected by higher surfactant loadings
In addition, the blend with 5g of high-functionality soy-based polyol increases the CFD value to 328kPa
.
They stated that this is comparable to Baydur's 683 figure
