Polyurethane dispersion HIREN   HIREN is Polyester based non-yellowing polyurethane dispersion. In the molecular backbone, isocyanates are fully reacted and there were no unreacted isocyanate group. HIREN dispersed in water with small amount of cosolvent by neutralizing the carboxyl groups in the prepolymer backbone. Main advantage of HIREN is as following. *Gained film has good gloss. *Dried film has good mechanical properties than other emulsion(Higher elongation value, good tensile strength and modulus toughness and flexibility). *Dried film has a little surface blocking compared than other emulsion. *Good stability. *Because of low viscosity, handling is easy. *Lower VOC. *HIREN can be blend with every type of acrylic emulsion to reduce the cost and improve the film properties. -Combine with the curing agent, it is possible to get the cured film.   Physical Properties of HIREN EU Grade Physical properties HIREN EU201 HIREN EU203 HIREN EU206 Appearance Milky white liquid Solid content 34 - 36% 34 - 36% 34 - 3????? Viscosity 200cps max 100cps max 100cps max pH 9 - 10 9 - 10 9 - 10 Cosolvent (NMP/Water) 12/88 12/88 12/88 Ionic Charge Anionic Anionic Anionic Neutralizer TEA TEA TEA Film Flexibility Standard Soft Hard   Recommended crosslinkers   Aziridines - XAMA-7 : EIT,Inc - Dosage : 0.5% based on HIREN EU201   Amino crosslinker - CYMEL385 : CYTEC - HIMINO 70(Water reducible Melamine- formaldehyde. oligomer) - Dosage : 1-5% based on HIREN EU201   Recommended Acrylic emulsion   HISOL AC501 (Rigid coating) - Polymer Tg : 10 deg C - Mixing ratio : 70/30 - 50/50   HISOL AC520(Flexible coating) - Polymer Tg : -100 deg C - Mixing ratio : 70/30 - 50/50
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