• Categories:Applications
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• Time of issue:2023-06-19
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(Summary description)1. Particle and particle size distribution of titanium dioxide

 

The particle size requirements of titanium dioxide used in plastic profiles are much finer than those used in other fields. Usually coatings and other industries require a particle size of 0.2-0.4 microns, and the particle size of titanium dioxide of plastic profiles is required to be 0.15-0.3 microns, so that the blue bottom phase can be obtained, because in the blue bottom phase, from the principle of vision and pigment colorimetry, it will feel whiter.From the process of plastic profiles, this can play a role in shading the light yellow of resin raw materials and the yellow of other raw materials , unconventional large particles are almost non-existent. Titanium dioxide particles are in the optimal size range, and incident light in the visible spectrum can be scattered most efficiently.

 

2. The hiding power of titanium dioxide

 

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

 

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 index in the plastic profile industry. The profile obtained by titanium dioxide with good dispersion has uniform appearance color, no yellowing, and good whiteness. The main factors affecting the dispersion 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 distributor measurement method, and now most of the R & D and production units of the dispersion mainly use application tests to verify its effect, so as to obtain the advantages and disadvantages of dispersion.

 

4. Optical properties of titanium dioxide

 

Plastic profiles of various substrates, optical performance indicators are mainly the brightness and hue of titanium dioxide, the main source of these two indicators is the instrument method measurement of lab test results.