One of the important application areas of titanium dioxide (especially anatase) is the chemical fiber industry. Chemical fibers, especially synthetic fibers, have a neat molecular arrangement, a smooth surface, a dazzling luster and a translucent state, so a matting agent must be added before spinning. Because the greater the difference between the refractive index of the pigment and the fiber, the more obvious the matting effect, and titanium dioxide has the highest refractive index among all white pigments, so titanium dioxide is the most ideal matting material for synthetic fibers. Although the refractive index of the rutile type is higher than that of the anatase type, it is not as soft as the anatase type. The hard particles of the rutile type are easy to wear the spinneret and cutter, so the anatase type is generally used.
When titanium dioxide is extinct in the fiber, it can be divided into internal extinction and external extinction. In internal extinction, titanium dioxide is added to the stock solution before spinning or added to the resin during polymerization; external extinction is to disperse the titanium dioxide in a certain This kind of organic binder is used as a covering agent and passivating agent in some textiles, such as man-made fibers and taffeta. Most chemical fiber titanium dioxide is used in internal extinction. The amount of internal extinction is generally between 0.2% and 2%, and the usual amount is 0.3% (semi-dull). For example, titanium dioxide AH-105 for chemical fiber has good uniform particle size and narrow particle size distribution, excellent wake-up dispersion performance and dispersion stability, soft and excellent blue hue, especially easy to disperse in ethylene glycol, and After being dispersed in ethylene glycol, there are few coarse particles (longer diameter greater than 5μm), and at the same time, it has good covering performance, near-neutral pH and very small amount of harmful impurities, which can not only ensure that there are very few secondary particles in chemical fiber production. The secondary aggregation phenomenon produces or good whiteness and hue.