● When coloring plastic products using toner or masterbatch, color change may occur, which affects product quality.

● Possible causes of discoloration:

(1) During high temperature molding, the oxidative degradation of the matrix resin is caused;

(2) due to some components of plastic products, such as matrix and additives, or matrix and coloring pigments, or additives and pigments caused by chemical reactions;

(3) caused by the high temperature resistance of coloring pigments or auxiliaries, etc.

The following by analyzing the mechanism of color change caused by these factors, to provide a reference for plastic products manufacturers, in order to correctly select raw materials, so as to produce qualified plastic products.

● Color changes caused by plastic molding processing