1. The particles and particle size distribution of Titanium Dioxide
The particle size requirement of titanium dioxide used in plastic profiles is much finer than that used in other fields. Generally, the coating and other industries require a particle size range of 0.2-0.4 microns, while the particle size requirement for titanium dioxide in plastic profiles is 0.15-0.3 microns. This can obtain a blue background because within the blue background, from the principles of visual and pigment colorimetry, it gives a cleaner feeling. From the perspective of plastic profile technology, This can help to Mask the light yellow color of Resin raw materials and the yellow color of other raw materials. However, the finer the particle size, the better. If the particle size is too small, it will greatly reduce the weather resistance of titanium dioxide and affect its performance. At the same time, it is required that the narrower the particle distribution range, the better. Unconventional large particles are almost non-existent. Titanium dioxide particles are within the optimal particle size range, The incident light in the visible spectrum can be most effectively scattered.
2. The covering power of titanium dioxide
The covering power of titanium dioxide is represented by opacity in the profile industry. The higher the opacity of titanium dioxide, the higher the whiteness of colored plastic profiles. The covering power of titanium dioxide is mainly affected by the particle size distribution, particle size, and crystal form of pigments.
3. The dispersibility of titanium dioxide powder
The dispersibility of titanium dioxide has a significant impact on the production of plastic profiles and is an important application performance indicator in the plastic profile industry. Titanium dioxide with good dispersibility produces profiles with uniform appearance color, no yellowing, and good whiteness. 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 for the dispersion of titanium dioxide is the electron microscope method, while the quantitative method is generally the particle size distribution instrument measurement method. Currently, most research and production units mainly use application experiments to verify the effectiveness of dispersion, in order to determine the quality of dispersion.
4. Optical properties of titanium dioxide
The optical performance indicators of plastic profiles made of various substrates are mainly the brightness and color tone of titanium dioxide, which are mainly derived from the test results of l \ \ a \ \ b obtained by instrumental measurement.
