The selection and application of titanium dioxide

Titanium dioxide is an important fine chemical raw material, the chemical composition of titanium dioxide (TiO2), it is widely used, the market demand is large, a white inorganic pigment. Titanium dioxide commodity is divided into two categories: one is rutile titanium dioxide, it is light resistant, weather resistance, mostly used in the production of outdoor coatings and products; The other is anatase titanium dioxide, light resistance than rutile type is poor, mainly used in the production of indoor coatings and products. Titanium dioxide is widely used in coating, plastic, paper, ink, medicine, fiber, cosmetics and other fields with its excellent performance.

Factors to consider when choosing titanium dioxide：

Color factor

Titanium dioxide is called the “king of white pigments”, and the color index of titanium dioxide is whiteness. Even the same chemical composition of titanium dioxide, due to the process route, raw materials, equipment, technical level will also produce different colors, color light depends on the chemical composition, but more important, often plays a decisive role in the factor is its particle shape, size, particle size distribution, crystal form, impurity content and so on.

Factor of hiding power

The optical nature of the hiding power is caused by the difference in the refractive index of the pigment and the medium that exists around it. Rutile titanium dioxide refractive index of 2.71, anatase type of 2.55, is the highest hiding power of the white pigment.

The masking effect is mainly due to the scattering caused by titanium dioxide, or the absorption caused by the existence of colored substances, or the above two reasons to reduce the intensity of the incident light, the masking phenomenon occurs.

Therefore, the main reason for the hiding power of titanium dioxide is not only the chemical composition and crystal form, but also the particle shape, particle size and particle size distribution of titanium dioxide.

The coloring force factor

Coloring power is an important characteristic index of titanium dioxide, which is the ability of titanium dioxide to show its own pigment after mixing with another pigment. That is to say, for white pigments, it is mixed with a dark pigment, the lighter the color of the mixture, the stronger its coloring force (achromatic force).

Oil absorption factor

Oil absorption is also one of the important pigment properties of titanium dioxide, because it relates to the filling state of titanium dioxide in the color development agent, and can explain its dispersion properties in the medium. It is used in the paint industry to estimate the consistency of the paint before mixing, guide the formulation of the paint, and can initially calculate the pigment volume concentration (PVC) according to the following formula.

Chemical composition factor

The chemical composition of titanium dioxide determines the chemical properties of titanium dioxide, which is the main symbol of the difference between pigments. In addition to reflecting a series of pigment properties, such as whiteness, achromats, oil absorption, etc., it also plays a great role in its application performance, such as weather resistance, dispersion and so on.

Light resistance, weather resistance factors

The light resistance and weather resistance of titanium dioxide are important indicators to measure the application performance of titanium dioxide, and it is meaningless to refer to the light resistance and weather resistance alone. Only when titanium dioxide is applied to related application fields (such as automotive paint, profile, etc.), this index is meaningful.

Therefore, the light resistance and weather resistance of titanium dioxide refers to its light resistance and weather resistance in a certain field. In addition, the light resistance and weather resistance of titanium dioxide should be measured to ensure that the weather resistance of its application carrier is better than that of titanium dioxide. The main factors affecting the weather resistance index of titanium dioxide are its chemical composition, chemical form of the envelope material, crystal structure, application formula and so on.

The main points for attention in the application process of titanium dioxide

Stability of quality Product quality stability is very important for any enterprise.

Because the quality stability of titanium dioxide is directly related to the stability of its downstream user product quality. If some indicators of titanium dioxide are unstable, even if an indicator of titanium dioxide has been greatly improved, this is also the downstream user does not want the product, because downstream users want their product quality to be stable, they must adjust the formula according to the change of the quality index of titanium dioxide, otherwise there will be problems with product quality. Therefore, this issue is of great concern to users.

It is very important to choose suitable titanium dioxide products and titanium dioxide products suitable for this application field. At present, there are thousands of titanium dioxide models in the market, which are mainly divided into two categories: general and special. General product as the name implies is applicable in many fields, but it is in a specific application field, relative to a specific field of products, there will be a certain gap.

Therefore, titanium dioxide manufacturers should know which field their products are suitable for and which field they are not suitable for, and avoid recommending your company’s products to the application fields that are not suitable for the company’s products, which will effectively avoid many quality objections.