Example formulation guidelines for Bio Polyol RD, TT, TD

  Foamed using a hand mixing method
Rigid PUR foam composition, pbw FP-25
Bio Polyol RD, TT, TD 80
Cross linking polyols (e.g. Lupranol 3422 or Alcupol R-4720) 15
Glycerol 5
Water 2
c-pentane 13
Catalysts 1,2
TCPP 25
Surfactant 1,5
Characteristics of the system  
Isocyanate index >125
Renewable materials in polyurethane foam, %  up to 29
Technical parameters at 20 °C  
Start time, s 16
String time, s 44
End time, s 65
Tack free time, s 58
Rigid PUR foam characteristics  
Free rise density, kg/m3 29
Density when foamed in a mould, kg/m3 46
Compression strength (parallel foaming direction)  
EMod, MPa 3,98
σMax, Mpa 0,18
Other PUR foam characteristics  
Closed cell content, % 89,50
Water absorption (after 7 days), % 1,90
Thermal conductivity test  
Apparent Density, kg/m3 46,20
Average Lambda value, mW/mK 21,93

Our bio polyols should always be used alongside cross-linking polyols with a functionality of more than 5. For this we suggest using the Lupranol 3422 polyol from BASF or the Alcupol R-4720 from Repsol. All blowing agents currently used in the polyurethane industry are suitable for compositions with our polyols. We have studied water and c-pentane blowing agents, obtaining stable, high quality, rigid polyurethane compositions. As catalysts, tertiary amine compounds were used, but for a catalysis trimerization reaction of isocyanate potassium, an acetate solution in diethylene glycol was used.

FP-25 polyurethane composition was foamed by a hand mixing method in an open mould. An isocyanate component pMDI from BASF (Lupranat M20R) was used. Rigid polyurethane materials obtained from this composition contain up to 29 percent of renewable materials, and in the end product, compression strength, closed cell content, density, and thermal conductivity is comparable with commercially used polyurethane foams from petrochemical materials. An interesting benefit of using our polyols is that the polyurethane materials show very high hydrophobicity characteristics.

Thermal conductivity of 0.022 W/mK can be explained by the high density of prepared samples through the method of obtaining samples in moulds. Industrial mixing techniques could improve the cell structure of rigid polyurethane foams, which would improve thermal conductivity characteristics.