Titanium dioxide is a kind of white pigment with best tinting strength, and it has excellent covering power and color fastness, which makes it suitable for opaque white products. According to the different crystal forms, titanium dioxide types can be divided into anatase type and rutile type.
1. Different crystal structures: The crystal structures of anatase and rutile TiO2 are composed of interconnected TiO2 octahedrons. The difference between them lies in the degree of octahedral distortion and the way of connecting octahedrons.
2. Different uses: Rutile titanium dioxide has better weather resistance, light retention and color fading power than anatase titanium dioxide. The reason is that if the pure anatase titanium dioxide is stored with water and oxygen on the particle surface, the photochemical properties will be very active. Therefore, if you want to change the difference in the application, you must first achieve the light stability of it.
Anatase titanium dioxide is A-type titanium dioxide. It is a kind of excellent white powder pigment with good light scattering ability, good whiteness, strong covering power and high chemical stability. In addition, it is non-toxic and tasteless without irritation to human body.
Titanium dioxide used in papermaking is usually treated with surface free treatment. The treated anatase titanium dioxide can play the role of fluorescence and whitening to improve the whiteness of paper. Because anatase TiO2 is softer than rutile TiO2, the former is widely used in many industrial fields, such as coatings, plastics, papermaking and inks.
Rutile titanium dioxide is R-type titanium dioxide. Based on the production quality control experience of soleplate process rutile titanium dioxide, integrating the innovative researches on inorganic coating, organic treatment, salt treatment, calcination control, hydrolysis and product application, advanced color phase and particle size control, zirconium silicon aluminum phosphorus multiple inorganic coating and new organic treatment technology are adopted to develop a new generation of high-grade general-purpose (water partial) rutile titanium dioxide. Rutile TiO2 is suitable for all kinds of architectural coatings, industrial paints, anticorrosive paints, inks, powder coatings and other industries.
1. Light resistance and weather resistance
The light resistance and weather resistance of titanium dioxide are important measuring indicators in titanium dioxide purchase. It is meaningless to refer to its light resistance and weather resistance only. Only when titanium dioxide is applied to relevant applications (such as automotive paint, profiles) can this indicator be meaningful. Therefore, the light resistance and weather resistance of titanium dioxide refer to its light resistance and weather resistance in a certain field. The main factors affecting the weather resistance of titanium dioxide include its chemical composition, the chemical form of coating material, the crystal structure, the application formula.
The volatility of titanium dioxide is actually the water content. Because of the high energy and hydroxyl groups on the surface, some water must be adsorbed on the surface to reduce the surface energy. The amount of water adsorbed is related to the surface organic treatment of titanium dioxide as well as the humidity and temperature of the surrounding environment. The quality of the product can not be determined by the volatility of titanium dioxide, but depends on its application system. Generally speaking, the volatility of water-based systems has little influence on the application, but for oil-based systems and polyolefin systems, lower volatility is better, because high volatility will affect its dispersion performance in the system and the product quality.
Dispersity is also known as abrasive dispersion or abrasive wettability. It is called water dispersibility when used in the situation where water is the medium, and it is called oil dispersion when used in solvent and other coating systems. Dispersion index is an important application index of titanium dioxide. The dispersion performance not only affects the lightening power, covering power and oil absorption of titanium dioxide pigment, but also affects the gloss and weatherability of the coating film or profile molding. When grinding and dispersing TiO2 in the coating factory, the dispersion performance directly affects the grinding dispersion time, which is one of the important economic indicators in the coating production. Moreover, if the grinding time is too long, the equipment pollution will increase and the whiteness of the product will become worse. In the production of plastic color master batches or profiles, the dispersion has a direct impact on the replacement cycle of the handpiece screen and the performance of the final product.