The reason why the pearlescent bottle turns yellow is that the outer layer of the pearlescent pigment is coated with titanium dioxide.
When the pearlescent pigment is added to the plastic, the iron dioxide and the antioxidant in the plastic (such as B star) will react chemically.
Should, produce yellowing material, so that the plastic hose becomes yellow.
In addition, titanium dioxide has strong photochemical activity. When it absorbs ultraviolet light, it can make Electronic excitation. Thereby forming a pair of electrons, triggering chemical changes in the surrounding medium, phenomena such as weakening of the pearl effect and discoloration.
To effectively solve this problem, a special pearlescent production process needs to be adopted to improve the photochemical activity of the coated dichine. It can effectively prevent the reaction of titanium dioxide with antioxidants in plastics to produce yellowing substances, improve the stability of pearlescent pigments.
In addition, the plastic itself will also encounter the problem of yellowing.
Due to easy aging, intolerance to high temperature and other issues, the plastic itself will turn yellow.