Production method of nano titanium dioxide powder--liquid phase method
1.TiC1 4 to alkali hydrolysis and chlorination purification plant titanium white powder TiC1 4 as raw materials, it was diluted to a certain concentration, the addition of an alkaline solution and hydrolysis of the resulting titanium oxide hydrate was washed, dried After the calcination treatment, the nano titanium dioxide product is obtained. American Tioxide companies took advantage of this method is the synthesis of nano-needle rutile titanium dioxide products. The TTO series of nano titanium dioxide products produced by Japan's original industry company may also be produced by this method. The purity of the raw material of the process is high: the impurity ion is not introduced in the whole process, and the nano-powder with high purity, small particle size and narrow particle size distribution can be obtained by strictly controlling the process conditions, and the product quality is stable. The disadvantage is that the raw material cost is high, and the gel volume shrinkage during drying and calcination is large, which easily causes agglomeration between the nano titanium dioxide particles. An aqueous alkaline solution is added to the aqueous solution of TiOSO 4 to form a precipitate of titanium dioxide hydrate, which is then added to become a positively charged transparent sol. An anionic surfactant and sodium dodecylbenzene sulfonate are added to convert the sol micelles into lipophilic aggregates. Then, an organic solvent is added and shaken vigorously to convert the alternating particles into the organic phase to obtain an organosol, and then the nanometer ultrafine titanium dioxide is obtained by refluxing, vacuum distillation and heat treatment. The nano-scale ultra-fine titanium dioxide prepared by the method has good dispersibility and high transparency, but has a long process flow and high cost. ShaoXing Change Auto Synchronizer Ring Co.,Ltd , https://www.sxcjautoparts.com
2. TiOSO 4 hydrolysis method Using TiOSO 4 as raw material, it is formulated into a certain concentration of solution, and then subjected to alkali neutralization hydrolysis or heat hydrolysis, and the formed titanium dioxide hydrate is depolymerized, washed and dried, and then subjected to different forging. At the temperature of the firing, nano titanium dioxide products of different crystal forms are obtained. The outstanding advantage of this process is that the source of raw materials is wide and the cost of the product is low; the disadvantage is that the process route is long and the degree of automation is low, and the process parameters of each process need to be strictly controlled, otherwise it is difficult to obtain a nano titanium dioxide product with good dispersibility.
3. Titanium alkoxide hydrolysis method This method is a kind of sol-gel method, which uses titanium alkoxide as raw material to obtain sol by hydrolysis and polycondensation reaction. Further polycondensation gave a gel. The gel is dried and calcined to obtain nano titanium dioxide. The response is as follows: 
4. Hydrothermal synthesis In recent years, new technologies such as microwave technology and electrode submerged arc have been introduced into hydrothermal method to synthesize a series of nano-scale ceramic powders, making hydrothermal method one of the most promising nano titanium dioxide synthesis technologies. The basic operation is: adding a nano titanium dioxide precursor (filling degree of 60% to 80%) in a closed autoclave lining a corrosion-resistant material, heating at a certain heating rate, and waiting for the autoclave to reach a desired temperature. The value is kept at a constant temperature for a period of time. After the pressure is released, the nano-scale titanium dioxide is obtained by washing and drying. The hydrothermal method provides a special physical and chemical environment for the reaction, dissolution and crystallization of titanium dioxide precursors. The nano-titanium powder prepared by hydrothermal method has the characteristics of complete grain development, small original particle size, uniform distribution and less particle agglomeration. In particular, the preparation of nano titanium dioxide by hydrothermal method may avoid high temperature calcination experienced in order to obtain rutile type titanium dioxide, thereby effectively controlling agglomeration and grain growth between nano titanium dioxide particles. The key problem of hydrothermal synthesis of nano-titanium dioxide is that the equipment has to undergo high temperature and high pressure, so the material and safety requirements are strict, and the cost is high.
5. Peptization-extraction method Peptization-extraction method is a kind of phase transfer method, and its chemical principle is:
6. W/O microemulsion method The preparation of nano-scale ultra-fine Ti0 2 by microemulsion method is one of the methods studied in recent years. The key to microemulsion technology is to prepare microemulsions with uniform microscopic size, controllability and stability. Microemulsion method is expected to prepare monodisperse nano-titanium powder micropowder, but reducing cost and reducing agglomeration are still two major problems that need to be solved by microemulsion method. It is estimated that it takes a considerable time to produce nano-scale ultra-fine titanium dioxide by microemulsion method. .