Matters needing attention in the application of titanium dioxide

Titanium white powder is an important fine chemical raw material, the chemical composition of titanium dioxide (TiO2), it is widely used, the market demand for a white inorganic pigment. Titanium white powder products are divided into two categories: one is the goldstone type titanium white powder, it is light-resistant, weather-resistant, more used in the production of outdoor coatings and products; Titanium white powder with its excellent performance is widely used in coatings, plastics, paper, ink, pharmaceuticals, fibers, cosmetics and other fields
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factors to be taken into account when selecting titanium dioxide
color
color is an important technical indicator for labeling pigments. Titanium white powder is known as the "king of white pigments", titanium white powder color indicator is whiteness. Even titanium dioxide of the same chemical composition, due to the different routes, raw materials, equipment, technical levels will also produce color differences, color light is certainly dependent on the chemical composition, but the more important, often decisive factors are its particle shape, size, particle size distribution, crystalline, impurity content.
the optical nature of the
of the covering force is caused by the difference in the refractive index between the pigment and the medium around it. With a refractive index of 2.71 and a sharp titanium type of 2.55, the redstone-type titanium dioxide is the white pigment with the highest cover. The masking effect is mainly due to the scattering caused by titanium dioxide, or the absorption caused by the presence of colored substances or the above two reasons to reduce the intensity of the incoming light, the masking phenomenon occurs. Therefore, the main reason for determining the cover force of titanium dioxide is related to the particle shape, particle size and particle size distribution of titanium dioxide in addition to chemical composition and crystal form.
coloring force factor
coloring force is an important characteristic of titanium dioxide, that is, titanium dioxide mixed with another pigment, the mixture can be obtained to show its own pigment capacity. That is to say, for white pigments, when mixed with a dark pigment, the lighter the color of the mixture, the stronger its coloring force (coloring force).
the oil absorption factor
the amount of oil absorbed is also one of the important pigment properties of titanium dioxide, because it involves the filling state of titanium white powder in the colorizer, and can explain its dispersion performance in the medium. In the coating industry, the consistency of the coating is estimated before the paint is mixed, the formulation of the coating is guided, and the pigment volume concentration (PVC (5680, -40.00, -0.70%) can be calculated at the press of the press.
Chemical components
the chemical composition of titanium dioxide determines the chemical properties of titanium dioxide, it is the main indicator of the difference between pigments, it not only reflects a series of pigment properties of pigments, such as whiteness, coloration, oil absorption, etc., its application performance is also very large, such as weather resistance, dispersion and so on.
light resistance, weather resistance factors
the light resistance and weather resistance of titanium dioxide is an important index to measure the application performance of titanium dioxide, it is not meaningful to refer to its light resistance and weather resistance alone. This indicator is meaningful only if titanium dioxide is applied to related applications such as automotive paint, profiles, etc. Therefore, the light resistance and weather resistance of titanium dioxide refers to its light resistance and weather resistance in a certain field, in addition to measuring the light resistance and weather resistance of titanium dioxide to ensure that its application carrier weather resistance is better than titanium white powder. The main factors affecting the weather resistance index of titanium white powder are its chemical composition, the chemical form of envelope material, crystal structure, application formula and so on.
gloss factor
The gloss of titanium dioxide is an important index to measure the application performance of titanium dioxide, usually titanium white powder has no gloss, single-fingered gloss is meaningless. This indicator is meaningful only if titanium dioxide is applied to related applications such as automotive paint, ink, profiles, mastering, etc.
the volatile part factor
the volatile part of titanium dioxide is actually the water content. Because its surface has a high energy and hydroxyl, so its surface always has to absorb a certain amount of water to reduce its surface energy, the amount of water adsorbed and titanium dioxide surface organic treatment and its storage surrounding humidity and temperature. The volatility of titanium dioxide can not determine the quality of the product, depending on its application system. In general, the level of volatile parts of water-based systems has little impact on applications, but for oily systems and polyolefins and other systems, the lower the volatility, the better, because the high volatiles will affect its dispersed performance in the system and product quality.
severysistable factors
dispersion, also known as grinding dispersion or grinding wetting, is called water dispersion when used in water as a medium, and oil dispersion when used in coating systems such as solvents. Dispersion index is an important application index of titanium dioxide. Dispersion not only affects the antichroma, covering force, oil absorption and other indicators of titanium dioxide pigments, but also affects the gloss and weather resistance of coating film or profile molding. In the paint production plant grinding dispersion, dispersion of good or bad directly affect the length of grinding dispersion time, is one of the important economic indicators of paint production, and grinding time is too long, will also increase equipment pollution, so that the whiteness of the product is worse. In the production of plastic master grain or profile, the dispersion directly affects the cycle of changing the head screen and the performance of the final product.
the main considerations in the application process of titanium dioxide
the stability of
product quality is very important to any enterprise. Because the quality stability of titanium dioxide is directly related to the stability of the product quality of its downstream users. If some indicators of titanium white instability, even if a certain indicator of titanium dioxide has been greatly improved, this is the downstream users do not want the product, because downstream users want their own product quality stability, it must be based on the changes in the quality index of titanium dioxide on the formulation of the corresponding adjustments, otherwise product quality will be a problem. Therefore, this issue is a matter of great concern to the user.
to choose a suitable titanium dioxide
products to choose a good suitable application of titanium dioxide products is very important. Now there are thousands of models of titanium dioxide in the market, mainly divided into: general-purpose and special-purpose two categories. Universal products, as the name implies, are applicable in many areas, but there is a gap between them in a particular application area and in a specific product in a particular area. Plastic master-colored titanium dioxide must be changed from unique hydrophobic to water-repulsive. Water-based, oily coatings and plastics, because of their own nature, can not be shared. If the plastics industry is very well used special products in water-related applications, there will be major quality problems. Therefore, for titanium dioxide manufacturers to know, their own company's products are suitable for which field, not suitable for which field, to avoid the emergence of your company's products recommended to the application areas not suitable for the company's products, which will effectively avoid a lot of quality objections. The downstream users of titanium dioxide should also have some understanding of the products recommended by titanium dioxide manufacturers, by understanding whether the same industry has enterprises in use, how to use, and the new product must be tested before entering the factory to determine whether this product is suitable, in order to reduce their own due to improper selection of products caused unnecessary economic losses.