WD-8980 Waterborne HDI Hardener with 80±2% Solids for 2K PU

Overcoming Dispersion & Compatibility Challenges

Incorporating polyisocyanate crosslinkers into waterborne resin systems can sometimes lead to phase separation, haze, or premature viscosity increase if dispersion kinetics are not optimized.

As a hydrophilically modified aliphatic polyisocyanate, WD-8980 is engineered to achieve homogeneous self-emulsification under standard mechanical stirring. To maximize pot life and ensure optical clarity, we recommend pre-dispersing the hardener with an appropriate co-solvent or checking binder compatibility in bench trials prior to line production.

Balancing Chemical Resistance and Pot Life

Achieving high chemical and solvent resistance requires adequate crosslink density, which must be carefully balanced against practical working time in reactive 2K systems.

With a calibrated 15.0 ± 1.0% NCO content, WD-8980 enables formulators to dial in the exact stoichiometric NCO:OH ratio (typically 1.05 – 1.15) for robust MEK rub resistance and film toughness. Formulators should establish their specific workable pot-life window based on actual ambient temperature and humidity.

* Note: Dongsen supplies high-purity raw material hardeners. Final coating properties and pot-life limits should always be validated within your specific resin package and application line.

WD-8980 is primarily developed as a premium crosslinker for high-performance two-component (2K) waterborne polyurethane coatings, sealers, and topcoats:

• Industrial Wood Coatings: Formulated for clear wood lacquers and pigmented topcoats requiring excellent scratch resistance, optical warmth, and water-spot resistance.
• Waterborne Industrial Flooring: Enhances mechanical abrasion resistance and chemical barrier properties in concrete and epoxy-polyurethane floor sealers.
• Plastic & Electronics Coatings: Delivers superior adhesion and chemical durability on prepared plastic enclosures and automotive interior trims.

* Recommendation: Substrate surface tension and pre-treatment methods significantly affect final film adhesion. Preliminary laboratory screening is advised for special substrates.