Amino silicone oil is prone to yellowing mainly due to the following factors:

Oxidation reaction: The active hydrogen atoms in amino silicone oil readily react with oxygen in the air, generating oxygen-containing functional groups. These functional groups absorb certain wavelengths of visible light, causing the material to appear yellow.

Light exposure: Under light conditions, especially ultraviolet radiation, amino silicone oil undergoes cleavage reactions, producing free radicals and other reactive species. These reactive species further initiate chain reactions, leading to yellowing of the color. Prolonged light exposure accelerates this process.

High temperature conditions: High temperature environments accelerate the decomposition rate of amino silicone oil, also producing free radicals and other reactive species that cause color changes. In addition, high temperatures may promote oxidation and cleavage reactions, thereby exacerbating the yellowing phenomenon.

Chemical structure: Amino silicone oil prepared using aminoethylaminopropyl coupling agent has two amino groups and three active hydrogen atoms on its side chain. This structure makes amino silicone oil susceptible to forming azo chromophores under the influence of light, heat, and ultraviolet radiation, resulting in yellowing.

To mitigate the yellowing of amino silicone oil, measures such as selecting high-quality amino silicone oil, adding antioxidants to resist oxidation reactions, avoiding prolonged exposure to intense light, and controlling storage and usage temperatures can be taken. These measures help maintain the stability and color durability of amino silicone oil.