HydroFluoro olefin propellant in a polyurethane foam composition
A process and composition is described for the inclusion of polyether polyols in concentrations greater than 10% loading on the B-side formulation with a catalyst package less than 1% loading on the B-side formulation. In one specific example, the use of glycerin as a fluorine ion scavenger is utilized to improve performance of the polyurethane systems through a twelve-month shelf life.
1. A two component low pressure polyurethane foam comprising:
an A-side comprising:
at least one diisocyanate, and
an HFO propellant; and
a B-side comprising:
approximately 30-50% by weight of the B-side of at least one polyester polyol;
approximately 35% or greater by weight of the B-side of at least one polyether polyol;
approximately 1-15% by weight of the B-side of a triol that comprises glycerin as a fluoride ion scavenger;
an amine catalyst;
a catalyst that includes an organotin catalyst; and
an HFO propellant; and
a catalytic decay ratio (gel) is <1.5;
a catalytic decay ratio (tack-free) is <1.5; and
water in an amount of less than 1% by weight of the B-side prior to inclusion of the HFO propellant at the B-side.
2. The polyurethane foam of claim 1 wherein the HFO propellant is 1,3,3,3-tetrafluoropropene.