Name: Epoxy Silane Adhesion Promoter ESA-187
Brand: Coatingsink
SKU: epoxy-silane-adhesion-promoter-esa
Availability: InStock

Question 1

How does ESA-187 function as a coupling agent between glass, metal, or mineral surfaces and organic coatings?

Accepted Answer

ESA-187 carries two reactive ends: the trimethoxysilyl group hydrolyzes to silanol in the presence of moisture, then condenses with surface hydroxyl groups on glass, silica, metal oxides, and minerals to form covalent Si–O–M bonds. The epoxy group at the other end reacts with amine, hydroxyl, or carboxyl functionalities in the organic binder, creating a covalent molecular bridge across the interface.

Question 2

Can ESA-187 be used as a crosslinker in addition to an adhesion promoter?

Accepted Answer

Yes. The epoxide ring of ESA-187 participates in ring-opening reactions with primary and secondary amines, carboxylic acids, and thiols under mild conditions. In amine-cured epoxy or polyurethane-amine systems, ESA-187 acts simultaneously as an adhesion promoter (via silanol condensation on substrate) and a crosslinker (via epoxy–amine reaction in the coating network), improving both adhesion and cohesive strength.

Question 3

What is the recommended addition level and method for ESA-187 in a waterborne anticorrosion primer?

Accepted Answer

Add ESA-187 at 0.3–1.0% on total formulation weight, preferably pre-hydrolyzed in slightly acidic water (pH 4–5, 0.5% acetic acid) for 30 minutes before addition to the aqueous phase. Direct addition without pre-hydrolysis is also possible but requires adequate mixing time. Exceeding 1.5% can lead to excessive crosslink density and brittleness in the cured film.

Purity	≥98%
Density (25°C)	1.07 g/ml
Viscosity (25°C)	2–4 mPa·s
Refractive Index (20°C)	1.427–1.432
Hydrolysis Rate (pH 5, 25°C)	<30 min

Epoxy Silane Adhesion Promoter ESA-187

Specifications

FAQ

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