Typical Formulation Ingredients
Phase
Ingredient
Parts by weight
A (Polyol Component):
Polybutadiene resin (Poly bd R45HTLO, Cray Valley)
A (Polyol Component):
Asphalt AA4909 (77 pen.)
A (Polyol Component):
White mineral oil (Renoil, Renkert Oil)
A (Polyol Component):
Dibutyltin dilaurate catalyst (T-12, Dabco)
B (Isocyanate Component):
Polymeric diphenylmethane diisocyanate (Mondur MRS 2, Convestro)
Resulting Properties
The formulations above are for general purpose two component asphalt filled polyurethane adhesives based on polybutadiene polyol. Using polybutadiene polyol will provide much better hydrolytic stability than other conventional polyols (e.g., polyester or polyether).
Often additives are not required to provide flexibility or toughness as in the case of epoxy formulations. Polyurethanes have the capability of providing these properties through manipulation of the resulting molecule by proper choice of isocyanate and polyol. However, additives are used mainly to stabilize the adhesive relative to moisture, oxidation, UV, etc.
(Source: Cray Valley)