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Adhesives Ingredients
The material selection platform
Adhesives Ingredients

1K CTBN Toughened Epoxy Adhesive (B) by CVC Thermoset Specialties

Adhesives Formulation

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. Hypro 1300X13 CTBN is a carboxyl terminated butadiene acrylonitrile copolymer used predominately as a reactant with the base thermoses 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: 190) 
xxxx 
CTBN – DGEBA epoxy adduct (HyPox RA 1340, CVC Thermosets) 
xx 
CTBN (Hypro 1300x13, CVC Thermosets) 
xx 
Tabular alumina 
xx 
Fumed silica (Cab-O-Sil TS 720, Cabot Corp.) 
xxx 
Dicyandiamide (Omnicure DDA10, CVC Thermosets) 
x 
Aromatic substituted urea, catalyst (Omnicure U405, CVC Thermosets) 
x 

Typical Properties

Properties
Fracture energy (J/m2) 
xxx 
Modulus (MPa) 
xxxx 
Glass transition temperature (°C) 
xxx 
T-peel strength (N/mm) 
xxx 

Processing

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Resulting Properties

The above table presents typical one 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. 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 CTBN modified epoxies is satisfactory as measured by most long term moisture tests.

(Source: CVC Thermoset Specialties)

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