(1) The pigment selected for the heat-resistant masterbatch, the most basic requirement can withstand the temperature in the production process of polypropylene fiber, and maintain its performance stability. The temperature resistance temperature is generally required to be 270 to 280 ° C or higher.
(2) The pigment for the dispersible masterbatch is excellent in dispersibility, and is uniformly dispersed in the masterbatch, and the dispersant used does not lower the quality of the polypropylene fiber. Otherwise, it is impossible to produce a good quality colored liquid of the raw liquid, and the operation is also unstable, and it is easy to break or generate abnormal fibers when the fiber is drawn.
(3) Brightness The coloring of the polypropylene stock solution has various uses, among which the bed cover base fabric and the knitted fabric require a bright color tone. Since organic pigments are bright and vivid, and are easy to color, organic pigments are required for use in the above applications.
(4) Light resistance Some pigments have a photosensitizing effect under the action of light, which causes the colored fibers to fade and be brittle, and the light resistance of the pigment is basically related to its chemical structure. Therefore, attention should be paid to the light fastness of the pigment when making the masterbatch. When a light-resistant pigment is used, it is conceivable to add a UV absorber.
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