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Adhesives Ingredients
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Adhesives Ingredients

2K, Modified Poly-BD Polyurethane Self-Adhesive (B)

Adhesives Formulation | Supplied by Cardolite

Applicable Type
Applicable Base Polymer
Applicable Industrial Sectors

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. 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. As a thermoset system, it also maintains its integrity at high temperature with excellent sag and chemical resistance.

Cardolite NX-9203LP by Cardolite is a di-functional CNSL polyester diol with reduced reactivity. It offers excellent moisture resistance and hydrolytic stability in aqueous solutions. Compatibility with PPG diols and Poly BD are outstanding, thus, when Cardolite NX-9203LP is blended with other diols, it shows significant improvement of hydrolytic stability.

This formulation showcases use of NX-9203LP as full replacement of PolyBD resin. View formulation variations:

Typical Formulation Ingredients

Phase
Ingredient
Parts by weight
Polyester diol (Cardolite® NX-9203LP, Cardolite) 
xxx 
Polyether triol (Voranol™ 260, Dow Chemical) 
xxxxx 
Calcium carbonate powder 
xxx 
Adhesion promoter (epoxy silane) 
xxxxx 
Modified diphenylmethane diisocyanate (Isonate™ 143LP, Dow Chemical) 
xxxx 

Typical Properties

Properties
Mixed viscosity, cps, at 25°C 
xxxx 
Tensile strength, MPa 
xxx 
Elongation at break, % 
xxxx 
Hardness, Shore A 
xx 
Water absorption at 25°C, % 7 Days 
xxxx 
Water absorption at 25°C, % 14 Days 
xxxx 
Aluminum Adhesion strength, MPa 
xxx 
Polycarbonate Adhesion strength, MPa 
xxx 
PVC Adhesion strength, MPa 
xxx 
Nylon Adhesion strength, MPa 
xxx 

Processing

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Resulting Properties

The formulations above are for general purpose two component 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.

Tips and Tricks

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