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 |
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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
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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
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