Energy savings plus mechanical reinforcement and rheology control

Fast Cure Epoxy-Mercaptan Adhesives

Adhesives Formulation

Applicable Type

Reactive Adhesives

Applicable Base Polymer

Epoxies (EP)

Applicable Industrial Sectors

Electrical & Electronic Bonding , Industrial Assembly

Applicable Base Polymer Properties

Epoxy adhesives are generally more resistant to a wide variety of liquid environments than other structural adhesives. The polymercaptans can also be used to accelerate the curing of epoxy resins systems blended with polyamines, amidoamines, or amines. The other curatives serve as the base to accelerate mercaptans, and the mercaptans react rapidly, generating the heat to accelerate the cure with the other hardener.
The major disadvantages of mercaptan curing agents are their odor, skinning, and low heat deflection temperature.

Typical Formulation Ingredients

Ingredient

Parts by weight

EPON Resin 828 (EEW 190)

xxx

Mercaptan curing agent

xxx

Tertiary amine curing agent - 2,4,5-ri(dimethylaminomethyl) phenol

Typical Properties

Properties

Gel time, mins @ 25°C

60 gm mass

xxx

0.015 inch film

xxx

Set time (sand track free), mins

Pencil hardness, 0.015 inch @ 25°C

1 hour

24 hours

Exotherm, °C, 60 gm mass

xxx

Hardness, Shore D @ 25°C, cured

• 5 minutes

• 15 minutes

• 30 minutes

• 60 minutes

• 8 hours

• 24 hours

Processing

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Resulting Properties

Typical starting formulations for rapid setting, room temperature curing epoxy mercaptan adhesive formulations are shown in the above table. The reaction of these materials when used alone is very sluggish at room temperature. However, the reaction proceeds at a practical rate by the addition of a base, which acts as an accelerator. Tertiary amines, such as DMP-10 or 30; triethylene tetramine (TETA), and diethylene triamine (DETA) are commonly used for this application.

Tips and Tricks

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