Evaluation of Nano Titanium White methods are the following criteria: The table below shows the performance of foreign nano titanium dioxide. Silanol Fluid,Organic Intermediate Silanol Fluid,Polysiloxane Silanol Fluid,Polysiloxane Chemicals Silanol Fluid Zhejiang Sucon Silicone Co.,Ltd. , https://www.hycsilicone.com
1 particle purity and surface cleanliness;
2 Whether the particle size and distribution of the particles are controllable;
3 particle geometry is uniform, crystal phase stability is good;
4 low degree of reunion, that is, good dispersion;
5 low cost, easy to mass production.
The gas phase method has a fast reaction speed and can realize continuous production, and the manufactured nano titanium dioxide powder has high purity, good dispersibility, less agglomeration and large surface activity, and the product is particularly suitable for fine ceramic materials, catalyst materials and electronic materials. However, the gas phase reaction is completed instantaneously at a high temperature, and the reaction material is required to achieve uniform microscopic mixing in a very short period of time, and has high requirements on the type of the reactor, the material of the equipment, the heating method, and the feeding mode. At present, the gas phase method is still in the stage of small trials in China. To achieve industrial production, it is also necessary to solve a series of engineering problems and equipment acquisition problems. Once China can use the gas phase method to mass produce nano titanium dioxide, it will be a big step forward in China's nanotechnology.
The liquid phase method for producing nano titanium dioxide has the advantages of wide source of raw materials, low cost, simple equipment and convenient mass production. However, the liquid phase method tends to cause the local concentration of the material to be too high, the particle size and shape are uneven, and because the ultrafine titanium dioxide particles are small, the specific surface area is large, and the surface energy is extremely high, the drying and calcining processes are likely to cause agglomeration between the particles, especially It is a hard agglomeration, which makes the dispersion of the product worse, affecting the use effect and application range of the product. The liquid phase method can introduce man-phase precipitation, microemulsion and high-temperature hydrothermal technology to control the size and particle size distribution; freeze-drying, azeotropic distillation, supercritical drying and surface treatment can also be introduced to reduce the particles. Reunion. We believe that as long as the process conditions are strictly controlled, nano-titanium dioxide powder with small particle size, narrow particle size distribution and good dispersibility can be obtained. In the liquid phase method, TiOSO 4 and TiCl 4 liquid phase neutralization hydrolysis or heating hydrolysis method The most potential for development, should increase the intensity and depth of research and development.
At present, the research direction of ultra-fine titanium dioxide in the world is as follows:
1 How to reduce the agglomeration of nano-fine titanium dioxide by surface treatment, improve its dispersibility, and broaden the application field of products, which is the urgent task of nano-titanium dioxide;
2 How to effectively control the particle size and shape.
The market price of foreign ultra-fine titanium dioxide products is generally 300,000 yuan / ton, while the price of ordinary titanium dioxide is only 14,000 yuan / ton, which shows that the added value of ultra-fine titanium dioxide technology is very high. . China's titanium ore resources are abundant, and we should seize the opportunity to develop nano titanium dioxide suitable for China with the focus on reducing costs, improving product dispersion and surface modification.
The quality test data of a brand of nano titanium dioxide is shown in the figure below. [next] 