Titanium dioxide is the coating film material can not only make the coated surface bright white, but also can enhance coating ability of weathering resistance, resistance to pulverization and rheological property.Realize the factors influencing the titanium dioxide dispersion in the coating, not only can improve the quality of coating, can also reduce pollution emissions, make cleaning industry for better implementation of the country.

　　1.The influencing factors of dispersion

　　In solvent paint, the application and performance characteristics of titanium dioxide decided the dispersion and the decentralized stabilizationof titanium dioxide in the resin and solvent oil performance.

　　Firstly,The average particle size and particle size distribution property of titanium white pigment.When the quality of titanium dioxide particle size less than 200 nm percentage is about 30%, Zeta potential around - 70 mv;If the quality percentage is less than 20%, the Zeta potential around - 40 mv,so titanium dioxide particle size of the serious influence the surface electrical,then affects surface adsorption performance.The partical size can’t too small,otherwise it will affect the other performance of the titanium dioxide, the best control granularity in Lm (0115 ~ 013).

　　Second, soluble matter content of titanium dioxide application performance.In mixed coating dispersed system, strong polarity inorganic ions will not only offset the charge on the surface of the titanium dioxide, and unable to form a powerful electric double layer, the adsorption on the surface of the titanium dioxide is abate, the resin can't firmly adsorbed on the surface of titanium dioxide particles,Reducing the titanium pigment dispersion stabilization, causing them to return to coarse in solvent coatings.

　　Finally,the high and low of oil absorption impact titanium dioxide dispersion and dispersion stability.High oil absorption of the titanium dioxide grinding after dispersion, part of solvent oil will be absorbed by titanium dioxide and make less than the oil soluble resin resin solvation degree is reduced, weaken the titanium dioxide adsorption, results in the decrease of the dispersion and dispersion stability.

　　2.For improvement of the dispersion

　　(1)Strict control of particle size and size distribution.

　　Factors affecting titanium pigment particle size and size distribution is more complicated it is difficult to fully grasp, so first of all, to improve the hydrolysis process and technology to ensure that the uniform particles generated the original level.Secondly to reinforce titanium dioxide particles uniform growth calcined critical temperature point of control.The final product of shatter, select high efficiency and good classification effect jet mill instead of Raymond system to stable titanium white surface features.

　　(2)Strictly control the oil absorption and water insoluble substance

　　Titanium dioxide oil absorption with calcination atmosphere in the sintering process and high temperature calcining temperature.If improper control.So,Must control the appropriate calcination temperature to adjust feed rate and rotational speed of kiln body is reasonable matching, thus reducing the particles of lattice defects and rule the geometric shape of particles.

　　3.Strict surface treatment

　　At present, most of Chinese paint manufacturers coating with a anatase grade titanium dioxide, its dispersion in the coating is poorer,industry under the background of the state advocates the clean, rutile type titanium dioxide application in coatings industry gradually replace anatase type titanium dioxide.To still use anatase titanium pigment coating enterprise, can change its surface properties by surface treatment, such as choosing organic silicon and nitrogen coupling reagent or some polyphosphate, etc.

　　Dispersion is one of the most important indicators in titanium dioxide production.Dispersion is not good, not only affect the effect of titanium dioxide and pollution will also increase.With the high-speed development of economy and policy in our country, especially more perfect of environmental policy, especially related to titanium dioxide industry changing paint manufacturing and it to titanium dioxide industry in China has brought unprecedented opportunities and challenges.Therefore,Titanium dioxide enterprises should carefully study the product performance,in a timely manner to improve production technology and the ramming foundation.Let the national policy change from resistance thrust achieve the stability of the enterprise.