Isocyanate reacts rapidly with terminal amino polyether, gelating in seconds without catalyst. 1:1 two-component spray application, film thickness 1-5mmmm onceForming.
Polyurea: Component A (isocyanate prepolymer) + Component B (terminal amino polyether + chain extender) impingement mixed:
Amine group reacts with -NCO 1000x faster than hydroxyl, no catalyst, no moisture, cures even at -10°C. Gel time 5-10 seconds, 1 walkable after minutes.
| Parameter | Typical Value | Description |
|---|---|---|
| Mixing Ratio | A:B = 1:1 (by volume) | Strict Metering |
| Spray Application Temperature | 65-70℃ | Heated Viscosity Reduction |
| Spray Application Pressure | 15-20 MPa | High-pressure Impingement Mixing |
| film thickness | 1-5 mm | One-pass forming, no sagging |
| Gel Time | 5-10 s | Second-levelCure |
| Pot Life | No pot life (two-component isolation) | No post-mix pot life issue |
| Defect | Cause | Solution |
|---|---|---|
| Blistering | Substrate moisture | Substrate moisture content <8% |
| Poor Adhesion | Substrate not sanded / cleaned | Blast Sa2.5 + dedicated primer |
| Pinholes | Humidity >80% | Stop application |
| Delamination | Mix ratio deviation | Regular calibration of metering pump |
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