Energy savings plus mechanical reinforcement and rheology control

2K Epoxy-Polyurethane Adhesive with Enhanced Flexibility (C)

Adhesives Formulation | Supplied by Covestro

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Epoxy-functional , Polyurethanes

Applicable Industrial Sectors

Buildings & constructions , Industrial Assembly

Applicable Base Polymer Properties

Desmocap 12A is a linear aromatic urethane polymer with ether groups. Desmocap 12A can be considered as a flexibilizer for epoxy resins. The joint reaction with polyamines ensures the incorporation of the polyether urethane in the system. A particular advantage of Desmocap 12A is the relatively low viscosity of the solvent free product. This formulation demonstrates the flexibilizing effect of Desmocap 12A when used in combination with an unmodified liquid epoxy resin.

Typical Formulation Ingredients

Phase

Ingredient

Parts by weight

Unmodified epoxy resin (Epoxy value 0.5-0.55)

Polyurethane prepolymer (Desmocap 12 A, Covestro)

Amine hardener (Laromine C260, BASF Corporation)

xxxx

Typical Properties

Properties

Elongation at break, %

xxx

Tensile strength, psi

xxxx

Shore D hardness

Water absorption, %

xxx

Processing

Resulting Properties

Epoxy urethane adhesives provide properties when cured that are similar to epoxy-nylons except they provide a major improvement in moisture resistance. Isocyanate monomers and prepolymers will react with the hydroxyl groups on epoxy resins to give tough, flexible hybrids. These adhesives have been noted for their excellent adhesion to many high-energy plastic substrates and for their propensity to bond to oily metal substrates.

Tips and Tricks

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