Aromatic diamine used in polyurea, polyurethane foam elastomer applications.
Unilink 4200 is an easy to handle di-functional aromatic diamine that is low in toxicity, relatively insensitive to moisture and compatible with a wide range of co-curative and other components. Due to relatively low reactivity, Unilink 4200 can be used in TDI or MDI formulations, and cross-linking can be controlled by adding higher functioning polyols
Unilink 4200 improves gel time, flow and allows the polyurea coatings to be processed by spray or pour techniques. Adhesion to the substrate and surface finishes improve, and so does bonding between coats. Cured systems have excellent physical properties and exhibit significant improvements in impact resistance and low-temperature performance.
Unilink 4200 improves tensile, tear and load-bearing properties In standard TDI and high-resilience slabstock foam systems, often at lower foam densities, and significantly improves polyester foam tear strength and load-bearing. It reduces density and softens cold-molded foams, producing higher tensile strength, tear and elongation, along with improved mold flow and decreased de-mold times.
Rigid foams cured with UNILINK 4200 show significant improvements in compressive strength and dimensional stability with reduced friability, a higher percentage of closed cells and lower K-factor. Compressive strength improves by up to 100% in PIR foams, and dimensional stability also is significantly enhanced.
Coatings, Adhesives, Sealants & Elastomers
Formulations cured with UNILINK 4200 adhere better and develop smoother surface finishes.
Easy to handle and environmentally friendly liquid (Ames negative)
Low moisture sensitivity
Compatible with polyurethanes, most polyols, and curatives
Excellent storage stability in polyether and polyester polyols.
Cures TDI and MDI coating compounds at ambient temperature
Appearance Clear: light-to-dark-brown liquid
Hydroxyl number: 362
Flash point, PMCC, °C (°F), min: 161 (321.8)
Specific gravity @ 26.7 °C (80 °F): 0.98 to 0.99
Density, g/cm3 (lb/gal): 0.995 (8.3 )
Water content, ppm, max: 500
Molecular weight: 310
Equivalent weight, min: 153
Primary Chemistry: Di-functional Diamine
Chemistry: Amines; Amines