PZ-28 is a propylene imine tri-functional polyaziridine with a functionality of 2.8. PZ-28 is used as a cross-linker for both aqueous and non-aqueous coatings, inks, and adhesives to promote both physical and chemical properties. The methyl group attached to the aziridine ring provides a degree of steric hinderance, which allows a pot life of 12-24 hours in a formulation with a pH of 9-9.5. Therefore, PZ-28 is ideal for general purpose factory applied applications.
PZ-33 is an ethylene imine based tri-functional polyaziridine that is also used as a cross-linker for both aqueous and non-aqueous field and factory applied coatings and inks to promote both physical and chemical properties. With the highest level of functionality at 3.3, it yields the highest level of cross-link density of polyfunctional aziridines. However, due to the unsubstituted aziridine rings, the typical pot life of the PZ-33 is 4-8 hours in a formulation with a pH of 9-9.5. This grade is ideal for field or factory applied coatings where a faster dry time and greater cross-link density is desired. Also, the added hydroxyl group on this molecule allows PZ-33 to be easily dispersed into an aqueous coating, adhesive, or ink.
PZBI-25 is a difunctional polyfunctional aziridine cross-linker used in acid functional coatings, inks, and adhesives to increase adhesion, physical, and chemical properties. It is activated at temperatures of 80º C and 120º C (200º and 275 º F). It is used in water-based systems in industrial coatings, adhesives, textile pigments, printing and leather finishingThis polyfunctional aziridine functions as the aziridine end groups react with active hydrogen as found on carboxyl groups of acrylic emulsions or polyurethane dispersions.
Typical Properties of Polyfunctional Aziridines
|Appearance||Slight amber clear liquid||Slight amber clear liquid||White dispersion|
|Aziridine Content, meq/g||5.4-6.6||6.4-7.3||N/A|
|Density @ 25° C g/ml||1.05-1.09||1.15-1.20||1.15-1.20|
|Viscosity, cp @ 25°||100-300||<4,000||<300|