What's the Differences in Key Performance Between middle layer silicone catalyst and normal silicone catalyst?
The performance evaluation focuses of the two are completely different. The ordinary silicone curing agent focuses on "curing efficiency", while the middle-layer curing agent pays more attention to "interlayer performance":
| Performance Indicator | Ordinary Silicone Curing Agent | Middle-Layer Curing Agent |
|---|---|---|
| Curing Speed | A core indicator (for example, the RTV-1 silicone curing agent needs to control the surface drying / actual drying within 24 hours) | Needs to balance the "curing speed" and the "interface reaction time". If the curing is too fast, the coupling agent may not be fully combined, which will instead reduce the adhesion. |
| Interlayer Adhesion | No requirement (or only relying on the physical adsorption of the silicone itself, with an adhesion force ≤ 0.5MPa) | A core indicator (usually requiring an adhesion force ≥ 1.0MPa, and ≥ 2.0MPa in some high-requirement scenarios, which needs to be verified by a "90° peel test"). |
| Environmental Stability Resistance | Only ensure the temperature resistance (-60~200℃) and aging resistance of the silicone itself. | An additional requirement for "interlayer environmental resistance" (for example, the attenuation of interlayer adhesion force ≤ 15% to avoid interlayer cracking due to environmental changes). |
| Compatibility | Only needs to be compatible with the silicone matrix (no precipitation, no yellowing). | Needs to be compatible with both the "silicone matrix" and the "substrate (such as metal, plastic)" at the same time to avoid interface blistering and delamination due to poor compatibility. |