Volume 2, Issue 10 (November 2005)
Reducing Tin and Aminosilane Concentration in Silicone Elastomeric Coating to Improve Its Durability
This study evaluated the impacts of tin and amino-functional silane on the long-term durability of a silicone coating material.
An experimental design was applied. Tin and aminosilane's concentrations were the variables. Laboratory-made samples were tested for initial mechanical properties. Samples were further placed in the QUV accelerated weathering chamber (fluorescent UV and condensation method) and tested periodically for tensile and elongation properties within the durability evaluation.
Based on the observations of the material and the measurements of mechanical properties, the concentration of tin in the formulation has the most influential impact on durability. The higher the concentration of tin, the faster the chalking. The concentration of the aminosilane also showed similar impacts on the durability, but not as significant as tin.
This study suggested that it is feasible to reduce both tin and aminosilane's amount by 30 % without significant impacts on the material's properties, and this may improve the coating's durability by more than 50 %. This finding may also apply to silicone sealant and adhesives.