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The material selection platform
Adhesives Ingredients
The material selection platform
Adhesives Ingredients

2K Room Temperature Cured Toughened Epoxy Adhesive (C)

Adhesives Formulation

Applicable Type
Applicable Base Polymer

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.

Hypox products are predominately reactants of CTBN with the base thermoset resin to gain product performance improvements. These resultant pre-reacts (adducts) can be incorporated at various levels to suit the needs of the specific formulation.

Typical Formulation Ingredients

Phase
Ingredient
Parts by weight
DGEBA liquid epoxy (EEW: 180-190) 
xxxx 
CTBN – DGEBA epoxy adduct (HyPox RA 1340, CVC Thermosets) 
xxxx 
Aliphatic amine adduct 
xxxx 
Atomite Whiting 
xx 

Typical Properties

Properties
Lap shear strength (sandblasted cold roll steel), psi, at: 
 
+83°C 
xxxx 
Room temperature 
xxxx 
-40°C 
xxxx 
T-peel strength, pli, at room temperature 
xx 

Processing

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Resulting Properties

The above table presents typical two component epoxy adhesive formulations using CTBN toughening agents. Toughened epoxy adhesives are generally available as single component, elevated temperature curing systems that employ dicyandiamide as the curing agent. 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 CTBN modified epoxies is satisfactory as measured by most long term moisture tests.

Tips and Tricks

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