What are the main requirements for selecting plastic titanium dioxide powder

August 03, 2023

Titanium Dioxide R5566 1 Jpg

1. Particle size distribution of Titanium Dioxide

The particle size of titanium dioxide used in plastic profiles is much smaller than that used in other fields. Generally, the particle size of titanium dioxide used in paint and other industries is within the range of 0.2-0.4 microns, while the particle size of titanium dioxide used in plastic profiles is required to be 0.15-0.3 microns. In this way, the blue background can be obtained, because within the blue background, from the principle of vision and Colorimetry of pigments, it will give a white feeling. From the perspective of the process of plastic profiles, This can 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 can greatly reduce the weather resistance of titanium dioxide powder and affect its performance. At the same time, 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 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 colored plastic profiles. The hiding power of titanium dioxide is mainly affected by the particle size distribution, particle size and crystal shape of pigments.

3. Dispersion 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 of titanium dioxide dispersivity is the electron microscope method, while the quantitative method is generally the particle size distribution meter measurement method. At present, the dispersivity of most R&D and production units mainly uses application tests to verify its effect, so as to obtain the advantages and disadvantages of dispersivity.

4. Optical properties of titanium dioxide powder

The optical performance indicators of plastic profiles made of various substrates are mainly the brightness and color tone of titanium dioxide powder, which are mainly derived from the test results obtained by instrumental measurement.

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