Long Pot Life Polyisocyanate Hardener for 2 Pack Coating Applications

Product Overview

Polyisocyanate hardener typically appears as a transparent viscous liquid with a slight yellow tint, as observed through visual inspection. Its solid content ranges from 60% to 100%, a parameter that can be adjusted to fit different formulation needs. When measured at 25°C using a Brookfield RV viscometer with spindle 3 at 20 rpm, its viscosity falls between 10000 and 120000 mPa·s. The color of the polyisocyanate hardener is rated below 1# on the Fe-Co scale, ensuring it does not compromise the aesthetic of the coatings it is mixed with. With a density of 1.05–1.15 g/cm³ at 25°C, it exhibits consistent physical properties that facilitate easy integration into various coating systems. Recommended solvents for this polyisocyanate hardener include xylene, ethyl acetate, PM, PMA, IPA, and MEK, all chosen for their compatibility with the formulation. When stored in sealed containers at 5–35°C in a cool, dry place, away from direct sunlight and moisture, it maintains its quality for up to 12 months.

Key Features

✧Exceptional weatherability: Aliphatic isocyanate crosslinker systems in polyisocyanate hardener deliver UV-stable coatings, ensuring long-term durability in outdoor environments such as marine vessels and architectural exteriors.

✧Rapid cure speed: Polyisocyanate hardener enables fast development of handling strength at room or slightly elevated temperatures, increasing production throughput and reducing manufacturing downtime.

✧Adjustable reactivity: Formulators can fine-tune pot life and gel time by selecting different functionalities or blocked variants of polyisocyanate hardener, allowing customization for specific application needs.

✧Excellent adhesion: Polyisocyanate hardener forms strong bonds with metals, plastics, glass, and composites without additional primers, simplifying the coating process and ensuring long-term adherence.

✧Low-temperature flexibility: Polyisocyanate hardener retains elastomeric properties at sub-zero temperatures, making it suitable for automotive and aerospace seals with temperature fluctuations.

Applications

✧Premium PU coatings for wood and metal: Polyisocyanate hardener enhances scratch resistance and imparts smooth glossy or matte finishes, elevating the aesthetic of furniture, cabinetry, and metal fixtures.

✧Automotive coatings: Unblocked polyisocyanate hardener enables quick repairs in refinish coatings with minimal downtime; solvent-based variants in OEM topcoats deliver high-gloss, durable finishes resistant to wear and UV damage.

✧Industrial coatings: Polyisocyanate hardener is used in floor coatings to withstand chemical exposure and heavy loads, and in corrosion-resistant coatings for outdoor metals to protect against rust and degradation.

✧Textile coatings and printing inks: Waterborne polyisocyanate hardener variants contribute to low-VOC formulations with excellent adhesion and flexibility, meeting industry performance needs.

✧Marine coatings: Polyisocyanate hardener resists saltwater and UV damage, ensuring the longevity of ships and offshore structures in harsh marine environments.

 

Benefits

 

• ✧Polyisocyanate hardener forms dense cross-linked networks, enhancing the durability of coatings by protecting substrates from acids, alkalis, and solvents, thus extending the service life of coated surfaces.
• ✧When reacting with polyols, polyisocyanate hardener creates tough polyurethane films, providing superior abrasion resistance that allows coatings to withstand frequent mechanical wear, making it ideal for high-traffic areas.
• ✧It offers solvent-free and low-VOC options, including waterborne polyisocyanate hardener variants, which meet strict environmental regulations, reduce volatile emissions, and lower health risks during application due to low odor and easy water cleanup.
• ✧Polyisocyanate hardener ensures excellent film build and leveling, especially in blocked types, allowing coatings to flow smoothly before curing and avoiding defects like unevenness, resulting in a flawless finish.
• ✧Unblocked polyisocyanate hardener delivers immediate hardness, helping coatings resist early damage such as scratches, which is crucial for maintaining surface integrity from the start.