What Are The Main Requirements for Choosing Plastic Titanium Dioxide?

1. Particles and particle size distribution of titanium dioxide

The particle size requirement of titanium dioxide used in plastic profiles is much finer than that of titanium dioxide used in other fields. Generally, the particle size required by coating and other industries is in the range of 0.2-0.4 microns, while the particle size of titanium dioxide used in plastic profiles is The diameter is required to be 0.15-0.3 microns, so that a blue base phase can be obtained, because in the blue base phase, from the perspective of vision and pigment colorimetry principles, it will give people a whiter feeling. From the perspective of plastic profiles From a technical point of view, this can mask the light yellow color of the resin raw material and the yellow color of other raw materials. However, the finer the particle size is not, the finer the better. If the particle size is too fine, it will make the titanium dioxide The weather resistance of titanium dioxide particles is greatly reduced, affecting its performance. At the same time, the distribution range of particles is required to be as narrow as possible, and ultra-conventional large particles almost do not exist. When titanium dioxide particles are within the optimal particle size range, the incident light in the visible spectrum can most efficiently scattered.

2. Hiding power of titanium dioxide

The hiding power of titanium dioxide is expressed in terms of opacity in the profile industry. The higher the opacity of titanium dioxide, the higher the whiteness of the plastic profile after coloring. The hiding power of titanium dioxide is mainly affected by the particle size distribution, particle size, and crystal structure of the pigment. type of influence.

3. Dispersion of titanium dioxide

The dispersion of titanium dioxide has a great influence on the production of plastic profiles and is an important application performance indicator in the plastic profile industry. The profile obtained from titanium dioxide with good dispersion has a uniform appearance, no yellowing and good whiteness. It affects the dispersion of titanium dioxide. The main factors 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, while the quantitative method is generally the particle size distribution meter measurement method. Now most R&D and production units mainly use application tests to verify the effect of dispersion, thus obtaining the dispersion The merits and demerits of sex.

4. Optical properties of titanium dioxide

The optical performance indicators of plastic profiles of various base materials are mainly the brightness and hue of titanium dioxide. The main sources of these two indicators are the test results of l\\a\\b measured by the instrumental method.