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Formulation

1K NBR Toughened Epoxy Adhesive (B) by Zeon Chemicals

Applicable Type
Applicable Base Polymer

Typical Formulation Ingredients

Phase
Ingredient
Parts by weight
DGEBA liquid epoxy (Epon 828, Momentive) 
   
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    DGEBA liquid epoxy (Epon 836, Momentive) 
       
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    NBR powder (DuoMod 5045, Zeon Chemicals) 
       
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    Triphenyl phosphine catalyst 
       
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    Dicyandiamide 
       
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    Diuron catalyst 
       
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    Typical Properties

    Properties
    Improved toughness at levels of less than 4% by weight 
       
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    Only slight reduction of glass transition temperature 
       
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    Carboxyl functionality and pre-crosslinked 
       
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    Ultra-fine powder particles are easily incorporated into epoxy resins 
       
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  • Applicable Base Polymer Properties

    Epoxy adhesives are generally more resistant to a wide variety of liquid environments than other structural adhesives. However, they are generally considered to be very rigid systems, and as such they do not have exceptionally good impact or peel resistance unless modified with tougheners. DuoMod® 5045 is pre-crosslinked and carboxyl functional ultra fine NBR powder designed specifically for the modification of epoxy based resins. It provides large increases in fracture toughness when compared with unmodified formulations. DuoMod has been found to overcome many of the shortcomings of conventional epoxy tougheners at loading levels less than 4%.

    Resulting Properties

    The above table presents typical one component epoxy adhesive formulations using NBR powder toughening agents. Toughened epoxy adhesives are generally available as single component, elevated temperature curing systems that employ dicyandiamide as the curing agent. Typical cure requirements are one hour at 125°C. Tensile shear strength and temperature resistance of these adhesives are relatively high. Peel strength is also high and does not decrease rapidly with lower temperatures. The durability of modified epoxies is satisfactory as measured by most long term moisture tests.

    (Source: Zeon Chemicals)

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