Abstract
CapatueTM ADP-S421 is a kind of adhesion promoter specially used for additional type silicone sealant. It is an alkoxy silane oligomers containing vinyl groups.It has good wetting ability to the surface of hard-to-stick substrate, it is mainly used to improve adhesion and water resistance of additional type silicone sealant to glass, ceramics, metal (such as aluminum, stainless steel, etc.) and polar resin (such as PC, Pet, PA, etc.) .
Mechanism of Reaction
The vinyl functional group of ADP-S421 can participate in the hydrosilylation of additional type silicone sealant, the alkoxy groups at the other end of their molecular structure hydrolyze to form silicon hydroxyl groups after being exposed to air, which can condense with the silicon hydroxyl groups on the surface of the substrate, through this bidirectional chemical bonding reaction, a strong"Molecular bridge" is built on the interface between the silica gel and the substrate, which can significantly improve the adhesion and water resistance of the additive silica gel to the substrate.
Applications and Performance
Various additional type silicone systems with SI-H, such as various additional type silicone sealant, structural adhesives, potting sealants, silicone gels and liquid silicone rubber LSR, etc.
Features and advantages:
No harmful elements such as nitrogen, phosphorus and sulfur, which can cause Catalyst poisoning in castor platinum, do not affect the curing of additional type silicone sealant.
The structure design of macromolecule, multi-monomer and multi-functional group of oligomer can not only participate in hydrosilylation, but also have low volatility and good safety.
Using Method
More than 120 ° C/30 minutes is better, if the low temperature (such as 100 ° C) should extend the baking time
Add in the vinyl component
Notes
1.First of all, make sure that there is no dirt or grease, mold release agent, lubricant, etc. , if necessary, first use alcohol, benzene, ether, ester solvent or water and other mixed solvents to clean the surface of the substrate.
2.Mechanical Beading, chemical etching, flame, ion beam, Corona, and other methods that increase Surface roughness and surface energy are useful for improving adhesion and may be recommended.
3.This product has the reaction characteristics of moisture curing, the storage process should be strictly sealed, effective isolation of air, otherwise it is easy to hydrolysis, polymerization and failure, resins, pigments, fillers, solvents, etc. should be strictly controlled water or to remove water in order to ensure the use of results.
Packing
This product is available in 5kg pail, 25kg pail, 200L drums and 1000L immediate bulk container.
Typical Properties
| Index |
Value |
| Appearance |
Colorless to yellowish transparent liquid |
| Specific Gravity (ρ20), g/cm3 |
1.18 |
| Viscosity,mPa·s |
365 |
| Dosage |
≤0.5-1.5% |
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