Economical One-package Epoxy Adhesives

Adhesives Formulation

Applicable Type

Applicable Base Polymer

Applicable Industrial Sectors

Structural assembly , Assembly , Transportation (excl. Automotive)

Applicable Base Polymer Properties

Latent curing agents, such as BF3 amines, are commonly used in producing one component epoxy adhesives. Being latent, these curing agents react with epoxies only on heating. They are relatively insoluble in the epoxy resin at room temperature, yet melt and become soluble at an activation temperature. Once activated, they cure relatively quickly at elevated temperatures.

Typical Formulation Ingredients

Ingredient

Parts by weight

Epoxy resin (Epon 828, Momentive Specialty Chemicals)

Ground calcium carbonate (Excal W3, Excalibar Minerals Inc.)

Fumed silica (Cab-O-Sil TS-720, Cabot Corporation)

BF3 amine catalyst (Leecure 38-239B, Leepoxy Plastics, Inc.)

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(Source: Momentive)

Typical Properties

Properties

Shelf life at 25°C, months

Viscosity at 25°C

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Density at 25°C, lbs/gal

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Cure schedule

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Tensile shear strength, psi, measured at 25°C on aluminum, after aging 7 days at 93°C

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Processing

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Resulting Properties

This one-package adhesive requires a moderate high temperature cure but it has a relatively long shelf life at room temperature. The high filler loading makes this adhesive thixotropic and high in viscosity, but it also reduces the cost of the formulation significantly. Tensile shear strength is only moderate due to the high filler loading.

Tips and Tricks

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