The amount of titanium dioxide in coatings and its application

Titanium dioxide physics has excellent optical, electrical properties and pigment application properties, so it has a wide range of use value. The physical, chemical and optical properties of titanium dioxide pigments are mainly determined by the original state of the pigment particles before coating and the chemical structure of the surface coating.

Titanium dioxide pigments generally use the oxides of silicon, aluminum and zirconium as surface treatment agents, precipitate on the surface of the particles to form a coating, and process control the form, quantity and method of precipitation. Some also use organic treatment agents. The different surface treatment methods give the personalized characteristics of titanium white pigment to meet the different needs of coating formulation design.

In order to meet the purpose of hiding power, the general enamel 30-40 microns can be covered. The added amount is 15-25% of the total formula; From the perspective of weather resistance and high gloss, matte powder is required to obtain high weather resistance matte paint, and the minimum amount of titanium dioxide is added and no other fillers are added. From the cost point of view, the addition of other system fillers to reduce the cost, the addition of other system fillers will reduce the addition of titanium dioxide, but to balance the brightness of the problem; For the interior wall latex paint that exceeds the CPVC value, the addition amount of titanium dioxide is 2%-4% to meet the requirements.

In the dispersion problem, the primer or the top paint with low requirements can be considered from the perspective of formula cost without wetting dispersion additives, but the floating color phenomenon should be controlled within an acceptable range. The phenomenon of floating color and flaring can be controlled by adding controlled flocculation additives to the primer and top paint.

In the high-grade finish paint, titanium white slurry can be used with low molecular weight wetting dispersion agent, other organic pigment slurry using high molecular weight wetting dispersion agent, the two are generally compatible; If it is a fluorocarbon topcoat, it is generally necessary to use high dispersion and high weather resistance titanium dioxide, and choose the appropriate wetting dispersion agent to solve the problem of floating color; If the anticorrosive primer, building latex paint and anticorrosive topcoat are selected with good dispersion titanium dioxide, the dispersion effect can be achieved by directly using a high-efficiency high-speed dispersion machine with the help of wetting dispersion additives, eliminating the grinding process.

The amount and variety of wetting dispersion AIDS are not the same, so the amount needs to be added according to the production needs in order to achieve the best effect of the use of top paint.