Amino silicone oil, as a commonly used polymer material, is widely used in the textile and cosmetics industries. The turbidity phenomenon that occurs when it comes into contact with water vapor is essentially the result of the combined effect of phase separation and emulsification imbalance. 
From the molecular structure perspective, the main chain of amino silicone oil is hydrophobic polysiloxane, while the side chains contain polar groups such as amino. The "hydrophobic main chain + polar side group" structure gives it a weak hydrophilic-hydrophobic balance. When exposed to water vapor, water molecules, as strong polar molecules, form hydrogen bonds with the polar groups in the amino silicone oil. As the water vapor content increases, a large number of water molecules gather around the polar groups, disrupting the original dissolution balance of the silicone oil molecules, causing some molecules to precipitate and form tiny droplets. 
The particle size of these droplets is usually within the visible light wavelength range (400-760nm), scattering light and causing the originally transparent amino silicone oil to appear turbid. In addition, the emulsification stability of amino silicone oil is also related to the amino content and molecular weight: the higher the amino content, the stronger the hydrophilicity, and the more likely it is to cause phase separation due to excessive water absorption when exposed to water vapor; while amino silicone oil with a larger molecular weight has a high degree of molecular chain entanglement, and the precipitated droplets are more difficult to re-disperse, resulting in more obvious turbidity. 
In practical applications, environmental humidity and temperature also affect the turbidity level. In a high-humidity environment, water vapor supply is abundant, accelerating the phase separation process; at low temperatures, the molecular movement rate is reduced, which is not conducive to the dispersion of droplets, further exacerbating the turbidity. This phenomenon is not chemical deterioration; it can usually be restored to transparency in a dry environment or by stirring evenly, but if it is exposed to a high-humidity state for a long time, it may cause the emulsion to break down, affecting the usage effect.