Performance requirements for selection of titanium dioxide for plastic profiles

May 15, 2023

Lomon Titanium Dioxide Jpg

1. Particle size distribution of Titanium Dioxide

The particle size of titanium dioxide used in plastic profiles is much smaller than that of titanium dioxide 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 μ m, while the particle size of plastic profiles is 0.15-0.3 μ m, so that the blue bottom phase can be obtained, because within the blue bottom phase, 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 of Resin raw materials and the yellow of other raw materials. However, the finer the particle size is, the better is not the better. If the particle size is too small, the weather resistance of titanium dioxide will be greatly reduced, affecting its use performance. At the same time, the narrower the particle distribution range is, the better is. There is almost no super conventional large particles. Titanium dioxide particles are within the optimal particle size range, The incident light in the visible spectrum can be most effectively scattered.

2. 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

The dispersity of titanium dioxide has a great impact on the production of plastic profiles, and is an important application performance indicator of the plastic profile industry. The profile made of titanium dioxide with good dispersivity has uniform appearance color, no yellowing, and good whiteness. The main factors affecting the dispersity 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

For plastic profiles of various substrates, the optical performance indicators are mainly the brightness and hue of titanium dioxide, which are mainly derived from the test results of l a b measured by instrument method.

Author:

Ms. Yolanda

E-mail:

info@jinhetec.com

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+86 13298161700