I. What is TiO2 Titanium Dioxide
The scientific name of titanium dioxide is titanium dioxide. It has two crystal forms: rutile and anatase. Anatase titanium dioxide has better whiteness, but its tinting strength is only 70 of rutile type. In terms of weather resistance, the anatase-type titanium dioxide test piece started to crack or peel after only one year, while the rutile-type titanium dioxide test piece had almost no change in appearance after ten years. Because rutile titanium dioxide has good tinting strength and weather resistance, it is best to use rutile titanium dioxide for plastic coloring.
II. The difference between anatase titanium dioxide and rutile
1. The crystal forms of the two are different. Titanium dioxide has three crystal structures: brookite, anatase and rutile. Due to its unstable crystal structure, brookite cannot exist stably for a long time in nature, so its small amount has no industrial value and has not been used. The rutile type tends to be more stable.
2. There is a difference in the particle size distribution of TiO2 between rutile and anatase products: because the crystal form of rutile products tends to be hexahedral, it is easier to disperse uniformly than anatase, and the formed agglomerates are more uniform. The particle size distribution is narrow.
3. Although the production processes of rutile and anatase are basically similar, the specific parameters are quite different.
4. Anatase products can only be produced by sulfuric acid method, and rutile products now have sulfuric acid method and chlorination method.
5. The last difference is the coating film: anatase products are basically calcined and precipitated, and then packed and sold after being crushed by Raymond mill. In order to better improve the dispersibility and weather resistance of rutile products, alumina or zirconium is used for surface treatment after calcination, and some organic treatments are also carried out.
