The requirements of the performance of titanium dioxide in coatings

coatings industry is the largest user of titanium dioxide, especially redstone type titanium white powder, most of the paint industry is consumed2018, China's coatings industry 1336 enterprises output reached 17.5979 million tons, an increase of 5.9% year-on-yearIn 2018, the total amount of industrial enterprises of more than 1998 enterprises of scale reached RMB326.81 billion, up 6.5% YoY, and the total profit amounted to RMB23.648 billion, up 5.1% YoYThe demand for titanium dioxide and the development of the coating industry is inseparable, the development of the coating industry will certainly promote the development of titanium dioxide industry, in 2018 the country's 39 full-process large-scale titanium dioxide enterprises of the comprehensive output of 2.9543 million t, compared to 2017 increase of 85,000 t, an increase of 2.95%Of the total output of 2.9543 million t, the redstone type was 2.293 million t, accounting for 77.62%, the sharp titanium type was 50.76 million t, accounting for 17.18%, and other titanium dioxide products such as non-pigment sand used were 154,000 t, accounting for 5.2%TiO2 consumed by thecoating industry accounts for 58% to 60% of the total consumption of titanium dioxide pigments, and the proportion of this consumption in China is higher, about 60% to 65%Titanium dioxide is the most used pigment in the coating industry, accounting for half of the cost of paint colorants, consumption in the coating industry accounted for 90% of the total consumption of various pigments in the coating industry, in the cost of coating raw materials accounted for 10% to 25%White pigments are numerous, why have the paint for many years only focused on titanium dioxide? This is mainly due to titanium dioxide being far superior to other white pigments in terms of all major propertiestitanium dioxide and other various white pigments of the main performance of the comparison can be seen in Table 1from Table 1, titanium dioxide has the highest refractive coefficient, so it has the highest masking force (opacity) and color removal and other optical properties, bright whiteness, high gloss and good dispersionTheoretically, in terms of masking force, gold-redstone-type titanium white powder is 5.56 times ordinary Lide powder, sharp titanium-type titanium white powder is 4.43 times that of ordinary Lide powder; Therefore, from the use of the effect, 1 ton of titanium dioxide is at least equivalent to 4 tons of ordinary Lide powder, from the service life (mainly refers to outdoor anti-powder) to see, the coating of the pigment with titanium white powder is 3 times higher than the coating with ordinary Lide powder as a pigment, which is the reason why the coating has been choosing titanium dioxide for a long timetitanium dioxide is one of the indispensable components of the coating, its role is not only cover and decoration, but also to improve the physical and chemical properties of the coating, improve the mechanical strength of the coating film, adhesion, corrosion resistance, light resistanceTherefore, the application of titanium dioxide should be considered from the base material, solvent, additives and other aspects, at the same time from the pigment characteristics, paint performance and other aspects to consider, reasonable choice of suitable for the performance requirements of the paint varieties and specifications of the modelPaint industry usually uses pigment-grade titanium dioxide, its quality requirements for titanium dioxide, first, whiteness is good; The requirements for the properties of titanium dioxide in common coatings are shown in Table 2table 2 commonly used coatings on the characteristics of titanium dioxide requirements