K-KAT Non-Tin, Mercury-Free Urethane Catalysts K-KAT URETHANE CATALYSTS. K-KAT Catalyst Selection Chart - Coatings. Tin alternative (Coatings)
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1 K-KAT Non-Tin, Mercury-Free Urethane Catalysts K-KAT catalysts additionally offer a number of performance advantages, including: K-KAT catalysts are metal compounds that are designed to accelerate the reaction of polyols with isocyanates. These catalysts are more environmentally acceptable than catalysts that contain tin or mercury. K-KAT catalysts are used in a wide range of urethane applications including coatings, elastomers and in prepolymer synthesis. K-KAT XK-614 Add to polyol side Efficient/ Add to NCO side 2K Polyurethane Solventborne Highly Efficient Non-yellowing Tin alternative (Coatings) Selectivity in the presence of moisture, less gassing Improved pot life/cure time relationship Mercury-like cure profile in elastomers Less toxic than tin and mercury catalysts Catalysis of secondary hydroxyl groups Cold temperature cure response K-KAT Catalyst Selection Chart - Coatings Solventless Good Gloss K-KAT XK-614 1K Blocked NCO Solventborne With MEKO Blocked NCO K-KAT XK-639 DMP Blocked NCO Efficient K-KAT XK-639 K-KAT 4205 Fast tack free time Long pot life with 2,4-PD Prepolymer Synthesis Efficient Non-persistent Add to NCO side Pages 13 & 14
2 K-KAT Catalyst Selection Chart - Elastomers Mercury Alternative (Elastomers) Aromatic NCO (Cure Profile - Closest to Hg) Aliphatic NCO (Cure Profile - Closest to Hg) K-KAT XK-618 Best Compatibility K-KAT XK-604 Best Selectivity (less gassing) K-KAT Catalysts for Coatings K-KAT Metal Use Levels (% on resin solids) K-KAT XC-B221 K-KAT XK-617 K-KAT XK-604 Best Selectivity (less gassing) K-KAT XK-617 Attributes Bi carboxylate Similar to - effective in 2K and blocked isocyanate coatings. Specially designed for European formulations. 348 Bi carboxylate Similar to - effective in 2K and blocked isocyanate coatings Al Chelate Excellent 2K urethane pot life when used with 2,4-pentanedione. Add pentanedione to polyol component before addition. XK-614 Metal Complex Most versatile. Effective in 2K waterborne and blocked isocyanate systems. Also effective in urethane elastomers. Add to polyol. XK-635 Metal Complex Very effective in solventborne and solventless 2K urethanes and 1K blocked isocyanate systems. Good with MEKO Blocked NCO. XK-639 Metal Complex Effective alternative to tin catalysts for DMP Blocked NCO Zr chelate Good pot life, recommended for 2K coatings. catalysis (less gassing) 6212 Zr chelate coating/elastomer catalysis (less gassing). Good elastomer gel profile. Add to NCO K-KAT Catalysts for Elastomers XK-604 Mixed carboxylate Very good gel profile in ambient cure 2K urethane elastomer systems XK-617 Mixed carboxylate Excellent gel profile in ambient cured 2K urethane elastomer systems Slightly less selective than XK-604 XK-618 Mixed carboxylate Best gel profile in ambient cured 2K urethane elastomer systems Less selective than XK-617
3 K-KAT Performance In Coatings K-KAT bismuth carboxylates are recommended for two component urethane systems offering: Bismuth Carboxylates & Complexes & K-KAT 348 Properties comparable to tin catalysts Non-yellowing characteristics Excellent gloss retention Catalysis of secondary OH groups Bismuth carboxylate catalysts work best in dehydrated systems. Both provide a cure profile similar to in 2K and blocked NCO systems without the environmental concerns. Zirconium Chelates K-KAT 4205 and 6212 K-KAT 4205 and 6212 are zirconium chelates used in 2K urethane coatings. Advantages include: Fast cure, selective catalysis (less gassing) Effectiveness in extreme conditions such as cold or humidity Good pot life K-KAT 4205 is unique in that it is a zirconium catalyst can be added to the polyol side. It is recommended for use in solventborne 2K coatings. must be added to the isocyanate component. It is recommended for 2K waterborne systems, 2K high solids coatings and RIM applications where plural component and in-line mixing systems are used. Aluminum Chelate can be used in both baked and ambient cured 2K urethane systems offering: Optimum synergy with pot life extenders such as 2,4 - Pentanedione The graph below demonstrates the potential improvement in the relationship between dry time and pot life when is used with 2,4-Pentanedione. The graph shows dry times and double viscosity times of a 2K polyester/hdi trimer catalyzed with and, both with and without 1.8% 2,4-Pentanedione. While pot life extension of the system was evident, the increase was much more significant in the system. Hours Metal Complexes K-KAT XK-614 and K-KAT XK-614 is a zinc complex catalyst for urethane coatings. Advantages include: Dry Time/Pot Life - / Polyester/HDI Trimer, Effect of 2,4-PD on Pot Life /1.8% PD /1.8% PD Surface Dry 2X Viscosity Excellent hydrolytic stability Better pot life in 2K WB urethanes than catalysis of the polyol/isocyanate reaction in the presence of moisture Excellent film properties K-KAT XK-614 has demonstrated excellent hydrolytic stability and an increased tendency to selectively accelerate the polyol/isocyanate reaction in the presence of moisture. These two characteristics make K-KAT XK-614 suitable for 2K waterborne urethane coating systems. A good indicator of pot life, or workable time, of a 2K waterborne urethane paint is gloss of cured films cast with aged paint. After the two components are combined, the aging process begins in the pot as polyol and water compete for free isocyanate groups. Gloss of films cast with aged paint is reduced as more water reacts with isocyanate in the pot. Pages 15 & 16
4 K-KAT Performance In Coatings The graph below demonstrates superior selectivity of K-KAT XK-614 in a white 2K waterborne urethane system. The graph plots gloss of films cast immediately after mixing and films cast on hour intervals after mixing. is very effective for solventborne and solventless 2K urethanes as well as blocked NCO solventborne, waterborne and solventless coatings. It is an environmentally friendly alternative to DBDTL offering: 60 Gloss GLOSS STUDY - K-KAT XK-614/ 2K Urethane Metal Complex Paint Age - Hours Good pot life in 2K systems Equivalent cure Excellent gloss retention Good hydrolytic stability Non-yellowing XK-614 No Catalyst Performance in 2K Urethanes As shown in the next two graphs, displayed better tack-free times and gloss than when tested in an air dry 2K urethane. TACK-FREE TIME - / Air Dry 2K Solventborne Urethane C 140 C 130 C 120 C GLOSS / Air Dry 2K Solventborne Urethane 20 Gloss, % 60 Gloss, % Performance in Blocked NCO has proven to be effective in blocked isocyanate systems offering equivalent or improved cure over. As shown below, over a range of cure temperatures offered performance as good or superior to as measured by MEK resistance in a 1K Acrylic/MEKO Blocked NCO. Both catalysts were used at 0.5% level on total resin solids with a 20 minute bake schedule. 2X MEK Rubs - / Acrylic/MEKO Blocked NCO, 20 Minute Bake no catalyst XK-635 Surface dry, hours Set to touch, hours Hours
5 K-KAT Applications Catalyst Selection by Applications Application Solvent Powder Automotive Basecoat K-KAT Automotive Topcoat Cast Elastomers Coil Electrocoat General Industrial Maintenance Prepolymer K-KAT 348, K-KAT 4205 K-KAT 348,, K-KAT XC-C227 K-KAT 4205, K-KAT 4205,, K-KAT A209 K-KAT 348, Refinish K-KAT 4205 Resin Synthesis Adhesives, Elastomers, Foam Caulks, Sealants, Roofing K-KAT A209 K-KAT 348, K-KAT A209, K-KAT XC-C227 K-KAT 348, K-KAT CATALYSTS FOR URETHANES 12
Can Coil (PCM) E-Coat Elastomers/Foam General Industrial. 1051, NACORR 1552 Acrylic Anodic 188, XM-332, XM ,188, A308
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