Properties of Biobased Rigid Polyurethane Foams Reinforced with Fillers: Microspheres and Nanoclay

Table 1

Foaming formulation of rigid soybean oil-based polyurethane foams (SBO PU foams) modified with fillers.

Ingredients	Concentration, php^a
B-side materials	Control PU foams	SBO PU foams
VORANOL 490 (Petroleum-based polyol)	100	85
Soybean oil-based polyol	0	15
Dimethylcyclohexylamine (gelling catalyst)	0.84	0.84
Pentamethyldiethylenetriamine (blowing catalyst)	1.26	1.26
Dabco DC 5357 (surfactant)	2.5	2.5
Distilled Water (blowing agent)	3.0	3.0
Filler (glass microsphere or nanoclay)	0	1,3,5,7
A-side material
Isocyanate index^b of PAPI 27	110	110

^aThe concentration of all ingredients are expressed in parts per hundred part of polyol, which conventionally dictates that the sum of all polyols adds up to 100 parts.
^bThe amount of isocyanate used relative to the theoretical equivalent amount. The isocyanate index is the ratio of the actual amount of isocyanate used over theoretical amount of isocyanate required times 100.