XC-105 polyfunctional aziridine is utilized as a crosslinking agent and adhesion promoter and modifier.
Appearance: colorless to pale amber liquid;
Total Solid (w/w ): >99%;
Molecular Formula & Weight: C20H33 N3O7, 427.50;
CAS NO.: 57116-45-7;
Viscosity, cp at 25°C: 1000-4000 max;
PH (25°C) : 8.0-11.0;
Density at 25°C g/ml: 1.18-1.20;
Freezing Point (°C): <-10.
When used as a cross-linker, XC-105 dramatically improves the final properties of many adhesive, coating, and printing applications. It imparts strength and flexibility, improves solvent resistance, alcohol and water resistance, increases hardness, and upgrades adhesion to difficult substrates.
XC-105 contains three aziridine groups in a high molecular weight, low volatile, molecule. Each aziridine group can react with an active H+, as found in the carboxyl groups of acrylic emulsions and polyurethane dispersions. This reaction protonates and opens the aziridine ring, which then reacts with the oxygen of the carboxyl groups forming a cross-link network.
TYPICAL APPLICATION CONDITIONS
Method of Addition: XC-105 is added to finish formulated coating systems just prior to use. Therefore, the polyfunctional aziridine crosslinker must be used in a two component system with addition taking place at the time of use. The crosslinker is added, slowly and with good agitation, directly to the formulated coating system. It can be added neat or in solution. If added in solution, a solvent without an active H+ should be used.
Addition Levels. The level of crosslinker to add to the formulated system will depend on the coating system and the desired properties of the coating film. Most applications find use levels between 1% and 3% based on resin solids. Higher levels, such as 5%, may yield higher solvent resistance and adhesion properties.
pH of the Formulated System. An aqueous system pH of 9.0-9.5, at the time of crosslinker addition, most often produces the optimum results. A lower pH may cause the aziridine to react prematurely in the pot.
Pot Life: An aqueous system containing a low boiling (volatile) amine, such as ammonia or triethylamine, has a pot life of about 12-24 hours. If use is extended beyond this time, there will be a loss of aziridine functionality. This loss can be replenished, without a negative effect on film properties, by adding more of the polyfunctional aziridine.
XC-105 crosslinker is miscible in water and many common organic solvents. This allows it to be used in both aqueous and solvent systems.
XC-105 crosslinker is very reactive with active hydrogen groups, such as those found in carboxyl groups of acrylic emulsions and polyurethane dispersions. Do not expose to acidic materials, high heat, direct sunlight, ultraviolet radiation, strong oxidizers.
XC-105 crosslinker must be stored away from acids and oxidizers. Store in a cool, dry, well ventilated storage area and in closed containers. Protect material from freezing. The shelf life is approximately 12 months from date of manufacture when stored in closed original containers at 25°C.
Adhesives: Increases cohesive strength, Faster cure time, Improves adhesion to difficult substrates, such as polyolefin, marble, stainless steel, and glass;
Pressure-Sensitive Adhesives: Increases cohesive strength, Adhesion modification, Improves adhesion to difficult substrates, such as polyolefin, marble, stainless steel, and glass, Faster cure time;
Printing Inks: Improves adhesion to varied substrates, Increases scuff resistance, Increases water and chemical resistance, Faster cure time;
Over-Print Varnishes: Improves adhesion to varied substrates, Increases scuff resistance, Increases water and chemical resistance, Increases high temperature resistance, Faster cure time;
Wood Coatings: Improves water and chemical resistance, Faster cure time, Low VOC formulations, Improves black heal resistance, Improves abrasion resistance;
Leather and Textile Coatings: Improves wear resistance, Faster cure time, Increases water and chemical resistance, Protective Films Adhesion modification, Faster cure time.
Photographic Films: Improved adhesion, Increases anti-static properties;
Plastic Films: Increases anti-static properties, Increases anti-blocking properties, Improves adhesion of coating.