1. Particles and particle size distribution of titanium dioxide The particle size of titanium dioxide used in plastic profiles is much finer than that used in other fields. Usually, the particle size required by industries such as coatings is within the range of 0.2-0.4 microns , and the particle size of titanium dioxide for plastic profiles is required to be 0.15-0.3 microns, so that a blue bottom phase can be obtained, because in the blue bottom phase, from the perspective of vision and the principle of pigment colorimetry, it gives people It will feel whiter. From the perspective of the plastic profile process, this can play a role in covering the light yellow of the resin raw material and the yellow of other raw materials. However, the finer the particle size, the finer the better. If the particle size If the particle size is too fine, the weather resistance of titanium dioxide will be greatly reduced, which will affect its performance. At the same time, the narrower the particle distribution range, the better, and there are almost no super-conventional large particles. Titanium dioxide particles are in the best particle size range Inside, incident light in the visible spectrum is scattered most efficiently.

2. Hiding power of titanium dioxide The hiding power of titanium dioxide is expressed by opacity in the profile industry. The higher the opacity of titanium dioxide, the higher the whiteness of plastic profiles after coloring. The hiding power of titanium dioxide is mainly affected by the pigment. Effects of particle size distribution, particle size, and crystal form.

3. Dispersion of titanium dioxide The dispersibility of titanium dioxide has a great influence on the production of plastic profiles, and is an important application performance index in the plastic profile industry. The profile obtained by titanium dioxide with good dispersibility has uniform appearance color, no yellowing, and whiteness. Good. The main factors affecting the dispersibility of titanium dioxide are: particle size distribution, specific surface area, surface potential, ph value, etc.

The qualitative characterization method of the dispersion of titanium dioxide is the electron microscope method, and the quantitative method is generally the particle size distribution meter measurement method. Now most of the research and development and production units mainly use the application test to verify the effect of the dispersion, so as to obtain the dispersion The pros and cons of sex.

4. Optical properties of titanium dioxide For plastic profiles of various substrates, the optical performance indicators are mainly the brightness and color tone of titanium dioxide. The main source of these two indicators is the test results of Lab obtained by instrumental method. out.