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Formulation

2K, General Purpose Poly bd Polyurethane Self-Adhesive (A) by Cray Valley

Typical Formulation Ingredients

Phase
Ingredient
Parts by weight
A (Polyol Component): 
Polybutadiene resin (Poly bd R45HTLO, Cray Valley) 
   
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    A (Polyol Component): 
    Asphalt AA4909 (407 pen.) 
       
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    A (Polyol Component): 
    White mineral oil (Renoil, Renkert Oil) 
       
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    A (Polyol Component): 
    Dibutyltin dilaurate catalyst (T-12, Dabco) 
       
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    B (Isocyanate Component): 
    Modified diphenylmethane diisocyanate (Isonate 143, Dow Chemical) 
       
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    Typical Properties

    Properties
    There appears to be no significant difference in performance of adhesives based upon either Isonate 143L or Mondur MRS 2 
       
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    Low temperature flexibility (due to low Tg of Poly bd) 
       
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    High temperature resistance (due to crosslinking) 
       
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    Good chemical resistance (dependent on asphalt concentration) 
       
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    Good adhesion to construction materials 
       
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    Compatibility with high loading of fillers 
       
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  • Applicable Base Polymer Properties

    Poly bd resin-based polyurethanes can be formulated to make self-adhesive systems. Such systems may contain tackifying resins or asphalt. The key to prepare such a product is to cure the system using a NCO index of less than 1 (preferably between 0.65 and 0.8). This can lead to a very good self adhesive product. Further, since the glass transition temperature of the Poly bd resin is very low, the tack is maintained at low temperatures, allowing contractors to work under winter-like weather conditions. Since this is a thermoset system, it also maintains its integrity at high temperature with excellent sag and chemical resistance.

    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)

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