Energy savings plus mechanical reinforcement and rheology control

One-Component Epoxy Adhesive for Bonding Oily Steel (B)

Adhesives Formulation

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Epoxies (EP)

Applicable Industrial Sectors

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

Applicable Base Polymer Properties

Latent curing agents, such as dicyandiamide, are commonly used in producing 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. Dicyandiamide provides excellent high temperature properties.

Typical Formulation Ingredients

Ingredient

Parts by weight

DGEBA epoxy resin (EPON 828 from Momentive)

Elastomer modified epoxy resin (EPON 58034 from Momentive)

Thixotrope (Kevlar pulp from Dupont Advanced Fibers)

Curing agent – dicyandiamide (Dyhard 100SF from Degussa)

Curing agent– carbohydrazide, micronized ( from Fairmont Chemicals)

Curing agent– adipic dihydrazide, micronized ( from Fairmont Chemicals)

Catalyst – 1-methylimidazole (Imicure AMI-1 from Air Products)

Catalyst (Dyhard UR300 from Degussa)

(Source: Momentive)

Typical Properties

Properties

Viscosity

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Shelf life at 4.5°C, months

xxx

Cure schedule

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Tensile shear strength, psi, at 25°C on:

Galvanized steel*

xxxx

Cold rolled steel*

xxxx

Tensile shear strength, psi, at 121°C on:

Galvanized steel*

xxx

Cold rolled steel*

xxxx

*all substrates lightly coated with drawing oil

Processing

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Resulting Properties

These starting point one-package adhesive formulations are especially suited for metal – metal bonding when the metal surfaces have a small amount of residual drawing oil, such as often encountered in automotive body assembly operations. Suggested uses include automotive stamped metal flange adhesives and other applications where metal panels may be contaminated with small amounts of residual drawing fluids/oils which cannot be removed before assembly. The main features of these adhesives are that they are one pack, have good adhesion to metal contaminated with small amounts of drawing oil, and have service temperature up to 121°C.

One-Component Epoxy Adhesive for Bonding Oily Steel (B)

Applicable Base Polymer Properties

Typical Formulation Ingredients

Typical Properties

Processing

Resulting Properties

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