Common knowledge of coating: difference between rutile titanium dioxide and anatase titanium dioxide

Core tip: the difference between rutile titanium dioxide and anatase titanium dioxide Physical property 1 Relative density Among the commonly used white pigments, the relative density of titanium dioxide is the smallest Among the white pigments of the same quality, titanium dioxide has the largest surface area and the largest pigment volume 2 Melting point and boiling point The melting point and boiling point of anatase titanium dioxide do not exist, because anatase will change to rutile at high temperature Only rutile titanium dioxide Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Coating home news: the difference between rutile titanium dioxide and anatase titanium dioxide physical properties 1 Relative density in common white pigments, titanium dioxide relative density is the smallest, the same quality of white pigments, titanium dioxide surface area is the largest, pigment volume is the highest 2 The melting point and boiling point of anatase titanium dioxide do not exist in fact because it will change into rutile at high temperature Only rutile titanium dioxide has melting point and boiling point The melting point of rutile titanium dioxide is 1850 ℃, the melting point in air is (1830 ± 15) ℃, and the melting point in oxygen enriched is 1879 ℃ The melting point is related to the purity of titanium dioxide The boiling point of rutile titanium dioxide is (3200 ± 300) ℃, and titanium dioxide is slightly volatile at this high temperature 3 The dielectric constant of titanium dioxide is high, so it has excellent electrical properties In the determination of some physical properties of titanium dioxide, the crystal direction of titanium dioxide crystal should be considered The dielectric constant of anatase titanium dioxide is relatively low, only 48 4 The conductivity of titanium dioxide has the properties of semiconductor, its conductivity increases rapidly with the rise of temperature, and it is also very sensitive to hypoxia The dielectric constant and semiconductor properties of rutile titanium dioxide are very important to the electronic industry, which can be used to produce electronic components such as ceramic capacitors 5 The hardness is on the scale of 10% of Mohs hardness Rutile titanium dioxide is 6-6.5 and anatase titanium dioxide is 5.5-6.0 Therefore, anatase is used to avoid abrasion of spinneret holes in chemical fiber extinction 6 Although the hygroscopic titanium dioxide has hydrophilicity, its hygroscopicity is not very strong, and the rutile type is smaller than the sharp titanium type The hygroscopicity of titanium dioxide is related to its surface area, which is large in surface area and high in hygroscopicity It is also related to surface treatment and properties 7 Chemical properties titanium dioxide is a kind of amphoteric oxide, which has stable chemical properties Under normal temperature, it hardly reacts with other elements and compounds, does not work on oxygen, ammonia, nitrogen, hydrogen sulfide, carbon dioxide, sulfur dioxide, is insoluble in water, fat, dilute acid, inorganic acid, alkali, and only in hydrofluoric acid However, under the action of light, titanium dioxide can produce continuous oxidation-reduction reaction with photochemical activity This kind of photochemical activity is especially obvious under ultraviolet irradiation, which makes titanium dioxide, even the photosensitive oxidation catalyst of some inorganic compounds, is also the photosensitive reduction catalyst of some organic compounds Rutile type is better than anatase type in powdering resistance and light retention However, the surface of pure TiO2 particles is photochemical active in the presence of water vapor and oxygen, rather than photochemical stable Pure TiO2 can even promote the degradation of the substrate around its particles Therefore, it is necessary to stabilize TiO2 itself first The stability can be obtained by controlling the kinds and contents of different inorganic oxides That is to say, TiO2 is treated by inorganic coating The formation of a screen between the surface around the TiO2 particles and the organic resin can no longer promote (reduce) the degradation of the organic resin The chemical name of titanium dioxide is titanium dioxide (TiO2), which is one of the best white pigments Compared with anatase type titanium white, rutile type titanium white has the following advantages: (1) high refractive index: rutile type refractive index is 2.71, anatase type refractive index is 2.52 So the former is better than the latter in covering power and glossiness (2) The crystal structure of rutile is different, the crystal structure is compact, the specific number is stable, the photochemical activity is small, so the weather resistance is good Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,