Why is white silicone adhesive sealant prone to yellowing?

The ketoxime cross-linking agent, amino silane tackifier and catalyst contained in the de ketoxime type silica gel may be yellowed on the surface due to the oxidation of amino groups or some chemical reactions of the catalyst under long-term ultraviolet light or high temperature environment above 80 ℃. In order to improve the yellowing phenomenon, special formulas are needed, such as solar silica gel, which has good yellowing resistance. When the dealcoholized silica gel is not completely solidified, the titanate catalyst that does not participate in the reaction will show its yellow color under heating conditions, which will make the colloid yellow.