Rutile titanium dioxide physical and chemical properties
Release time:
2022-07-26
Titanium dioxide is divided intoRutile titanium dioxideand anatase titanium dioxide. Generally, anatase titanium dioxide can be used directly without inorganic surface treatment, but its application fields and scope are somewhat limited, as the exposed surface of titanium dioxide has photoactive sites that can degrade surrounding organic fillers under sunlight or ultraviolet light, causing paints or plastics to lose luster, turn yellow, and become powdery, thereby reducing the lifespan of paints or plastics. Currently, the inorganic surface treatment process for anatase in production involves calcining titanate, followed by crushing, dispersing, and sanding the calcined kiln products, then performing inorganic surface treatment, followed by washing, flash evaporation, and powdering. This multi-step process increases production costs and reduces profit margins.
Physical and chemical properties of anatase titanium dioxide
Due to reasons such as domestic titanium resource endowment, technology, and equipment, 98% of domestic enterprises use the sulfate process to prepare anatase titanium dioxide. In the production of sulfate process titanium dioxide, calcination is one of the important processes, specifically, it is the process of converting hydrolyzed titanate into titanium dioxide particles after a series of impurity removal processes such as washing, rinsing, and filtering. During the calcination process, efforts should be made to ensure that the calcined material meets the following requirements: ① Through dehydration and desulfurization, the material should be neutral, achieving 100% conversion of the crystal form; ② The particle growth should be uniform and orderly, with the average particle size of pigment-grade titanium dioxide required to be 0.2 ~ 0.3 microns, and the shape should be as spherical as possible; ③ The calcined titanium dioxide should have no lattice defects, stable physical and chemical properties, and high pigment performance. In the industrial production process of anatase titanium dioxide, it is generally believed that calcination temperatures exceeding 930°C can easily lead to the sintering of titanium dioxide particles, resulting in decreased pigment performance and particles that are hard and difficult to break. The calcination temperature has a significant impact on the performance, morphology, and particle size of anatase titanium dioxide. As the calcination temperature increases from 915°C to 970°C, the decolorizing power gradually increases, while the blue phase gradually decreases. The higher the calcination temperature, the more titanium dioxide particles will be sintered, and the average particle size will increase to 310 nm. The ideal calcination temperature for anatase titanium dioxide is 935 ~ 945°C, resulting in titanium dioxide particle sizes of 260 nm, with a narrow particle size distribution and a decolorizing power greater than 1500. The blue phase is greater than 4.0, which belongs to high-quality anatase titanium dioxide.
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How to choose genuine rutile titanium dioxide
Rutile titanium dioxide is widely used in industries such as coatings, plastics, rubber, and inks. Rutile titanium can achieve the same technical performance as titanium dioxide, significantly reducing raw material costs. There are many fake rutile titanium dioxide products on the market, which can lead to the precipitation of white substances during plastic processing, mixed with a lot of calcium powder. To adjust the oil absorption changes caused by the addition of calcium powder, wax powder is added, deceiving many consumers. So how can we identify the authenticity of rutile titanium dioxide? 1. Chemical methods: 1. Add light calcium or heavy calcium to dilute sulfuric acid or hydrochloric acid: bubbles will make the solution turbid because calcium carbonate reacts with acid to produce carbon dioxide; 2. Add titanium white powder, dilute sulfuric acid or hydrochloric acid, which will have a rotten egg smell; 3. Make latex paint, add iron red, if the color is dark, it indicates poor hiding power, which is either fake or of poor quality titanium dioxide. 2. Physical methods: 1. A simple method is to compare the feel; fake titanium dioxide is smooth, while real titanium dioxide feels awkward; 2. Wash with water; fake titanium dioxide easily washes off hands, while real titanium dioxide does not; 3. Take a cup of clean water and add titanium dioxide. The one that floats is real, and the one that settles is fake. After understanding the methods to distinguish the authenticity of rutile titanium dioxide, let's look at...
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Differences in performance between rutile titanium dioxide and anatase titanium dioxide
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Key words: tengxian titanium dioxide, titanium dioxide, rutile, titanium dioxide manufacturers, anatase titanium dioxide, titanium dioxide manufacturers, anatase titanium dioxide, rutile titanium white
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Address: Teng County, Guangxi Chemical Industry Zone