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, coatings and other industries require a particle size of 0.2-0.4 microns.
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 base phase, from the perspective of vision and the principle of pigment colorimetry, it will give people a more white feeling.
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 particle size is not the finer the better. If the particle size is too fine, the weather resistance of titanium dioxide will be greatly reduced and its performance will be affected.
At the same time, the narrower the distribution range of the particles is required, the better, and there are almost no super-conventional large particles. The titanium dioxide particles are within the optimal particle size range, and the incident light in the visible spectrum can be scattered most effectively.
2. The hiding power of titanium dioxide
The hiding power of titanium dioxide is represented by opacity in the profile industry.
The higher the opacity of titanium dioxide, the higher the whiteness of the colored plastic profile. The hiding power of titanium dioxide is mainly affected by the particle size distribution, particle size and crystal form of the pigment.
3. The dispersibility of titanium dioxide
The dispersion 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, 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 of titanium dioxide dispersion is the electron microscope method, and the quantitative method is generally the particle size distribution meter measurement method.
Now most of the dispersion of R & D and production units mainly use application tests to verify its effect, so as to obtain the advantages and disadvantages of dispersion.
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 sources of these two indicators are given by the test results of l\\a\\b obtained by instrumental method.
Post time: Jul-07-2023