Name: Amphoteric Dispersant AD-200
Brand: Coatingsink
SKU: amphoteric-dispersant-ad200
Availability: InStock

Question 1

Why use an amphoteric dispersant for mixed organic and inorganic pigment systems?

Accepted Answer

Mixed pigment slurries contain surface sites with both acidic and basic character. AD-200's amphoteric backbone adsorbs onto both surface types, providing simultaneous steric and electrostatic stabilization. This prevents the charge competition that degrades performance when purely anionic or cationic dispersants are used on incompatible pigment surfaces, yielding lower mill-base viscosity and higher color strength.

Question 2

Over what pH range is AD-200 effective, and does it work in solventborne binders?

Accepted Answer

AD-200 maintains full dispersing efficiency across pH 4–10, covering acid-catalyzed alkyd systems through high-pH waterborne acrylic and polyurethane dispersions without charge reversal or performance loss. It is optimized for aqueous systems; for solventborne applications, confirm compatibility with the specific binder and pigment combination via lab trial before scale-up.

Question 3

How should AD-200 be incorporated into the pigment grinding process?

Accepted Answer

Add AD-200 to the water phase before pigment introduction. Start at 1.0% on total pigment weight and optimize by monitoring fineness-of-grind and post-grind viscosity; the effective range is 0.5–2.0% depending on pigment surface area and oil absorption. Pre-mixing AD-200 with dry pigment before binder addition improves initial wetting and shortens grind time compared to post-addition.

Active Content	40%
Density (25°C)	1.06 g/ml
Viscosity (25°C)	500–1500 mPa·s
Recommended Dosage	0.5–2.0% on pigment
pH (1% aq., 25°C)	6.0–7.5

Amphoteric Dispersant AD-200

Specifications

FAQ

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