Crosslinkable Polyurethane Dispersions
Polyurethane dispersion raw materials can be formulated as one-component (1K) systems or two-component (2K) systems:
The one-component system is a polyurethane dispersion already containing a deactivated latent-reactive isocyanate
The two-component system is made with a polyurethane dispersion which can be crosslinked with a second component, such as a water emulsifiable polyisocyanate.
Both systems will provide the same level of heat resistance, good initial and final bond strength as well as long-term durability.
The choice between these two systems will be primarily determined by the manufacturing process parameters used to assemble the parts to be bonded.
|2K PUD with Emulsifiable Polyisocyanate
||1K PUD with Deactivated Isocyanate
Limited pot life once the polyisocyanate is emulsified
Error in the mixing ratio is possible when the polyisocyanate is added
Processing step must take place at the end-user
Stable if stored < 30°C
Ready to use
Long open time when applying the adhesive (if < 30°C)
Parts to be bonded can be pre-coated and sold as such to the end-user. Bonding process is simplified as there is no adhesive handling at the end-user