2K EpoxyPolyurethane Sealant for Bridge Expansion Joints Standard Formulation

Typical Formulation Ingredients

Ingredient

Parts by weight

Part A:

Epoxy resin (Epikote 880, Shell)

xxxxxxx

Polyurethane resin (Desmocap 11, Bayer)

xxxxxxx

Part B:

Liquid tar

xxxx

Latent epoxy curing agent (Eurodur 43, Schering, AG)

xxxx

Dialkylamine epoxy curing agent (Anchor 1110, Anchor Chemicals)

xxxx

Plasticizer, dibutyl phthalate

xx

(Source: Mittal, K. and Pizzi, A., eds., Handbook of Sealant Technology, CRC Press, New York, 2009, p. 442)

Typical Properties

Properties

Strength at break, MPa

• At room temperature

xxxxx

• At -20°C

xx

Elongation at break, %

• At room temperature

xxx

• At -20°C

xx

Processing

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Resulting Properties

Polyurethanes are extensively and successfully used as adhesives and sealants, and they have an excellent record of durability. Blocked prepolymers are used in some of these formulations. At room temperature these blocked compounds do not react with the polyol, thus providing long shelf life. The blocked polyurethane systems can be applied either in the form of 100% solids, solution, or aqueous systems using elevated temperatures to deblock the isocyanate which then reacts with the other components.

Tips and Tricks

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2K Epoxy-Polyurethane Sealant for Bridge Expansion Joints (Standard Formulation)

Applicable Base Polymer Properties

Typical Formulation Ingredients

Typical Properties

Processing

Resulting Properties

Tips and Tricks