Energy savings plus mechanical reinforcement and rheology control

Polybutadiene Toughened RT Cure Epoxy Adhesives

Adhesives Formulation

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Epoxies (EP)

Applicable Industrial Sectors

Automotive , Buildings & constructions , Electrical & Electronic Bonding , Industrial Assembly , Tapes , Transportation (excl. Automotive)

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.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Part A

PolybutadieneGrade, Supplier Ricon 130MA20, Sartomer

xxxx

Part A

Maleic anhydrideGrade, Supplier Lindride 12, Lindau Corp.

xxxx

Part A

CatalystGrade, Supplier Byk A500, Byk Chemie

xxx

Part A

Catalyst Grade , Supplier Byk A515. Byk Chemie

xxx

Part B

Epoxy ResinGrade, Supplier DER 331, Dow Grade, Supplier DER 331, Dow

xxx

Part C

Grade, Supplier Name DAMA 1010

xxxxxxxxxxxxx

Processing

Resulting Properties

The above table presents typical three component epoxy adhesive formulations using polybutadiene with maleic anhydride as a toughening agent. The material is mixed 2:1 Part A : Part B by weight and then the DAMA 1010 is mixed into the formulation.
This epoxy system is claimed to provide a hydrophobic backbone, low viscosity, softness and high tensile strength and adhesion. Typical cured properties are:

Hardness	75 Shore D
Tensile Strength	2650 psi
Lap Shear Strength	9350 psi
Tg	119°-127°C

This adhesive formulation can cure at either room temperature or elevated temperatures. 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 polybutadiene modified epoxies is satisfactory as measured by most long term moisture tests.

Tips and Tricks

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