Preparation method of high-weatherability nanometer rutile titanium dioxide

Abstract

The invention relates to a preparation method of high-weatherability nanometer rutile titanium dioxide. The method has the following specific steps: respectively pumping metatitanic acid slurry and asodium hydroxide solution into a metering tank and preheating, mixing and stirring, heating and conducting an alkali dissolution reaction, cooling a mixture to room temperature, washing and discharging to obtain an alkali dissolution material; adding deionized water to the generated alkali dissolution material and stirring, adding concentrated hydrochloric acid and regulating pH of the slurry, heating the slurry, pressurizing the mixture and conducting a sol reaction, adding water to the mixture for dilution and stirring to obtain a nanometer rutile titanium dioxide crude product, pumping thecrude product into a centrifuge and centrifuging the slurry; neutralizing by adding a neutralizing agent and successively washing, coating, washing, drying and crushing so as to obtain the high-weatherability nanometer rutile titanium dioxide product. The method has the following advantages: synthesis temperature is low; the method is easy for industrial production; conditions are easy to control;and cost is low.

Description

technical field [0001] The invention provides a preparation method of high-weather-resistant nano-rutile titanium dioxide, which belongs to the field of nanometer materials. Background technique [0002] Titanium dioxide, chemical name: titanium dioxide (TiO2), is a polymorphic compound that is non-toxic and harmless to the human body. It has three crystal forms, brookite, anatase and rutile, of which the structure of rutile TiO2 is the most Stable and widely used, especially nano-rutile TiO2 has strong hiding power, coloring power and ultraviolet absorption ability due to its small particle size and large specific surface area. It has a wide range of applications and has high commercial value. [0003] At present, the preparation methods of nano-scale titanium dioxide mainly include gas-phase method and liquid-phase method. Titanium dioxide nanoparticles prepared by the gas phase method have high purity and good dispersibility, but the required equipment is complex, energ...

AI Technical Summary

Problems solved by technology

The hydrothermal method does not require high-temperature roasting, but the method is complicated to operate, requires high equipment, and is not easy for industrial production

The microemulsion method is a method of using two incompatible solvents to synthesize a solid phase under the action of a surfactant. The surfactant introduced by this method is not easy to recycle, pollutes the environment, and affects the purity of the product.

The sol-gel method includes sol preparation, sol-gel conversion, gel drying and roasting, which also requires high-temperature roasting, high energy consumption, and large pollution

That is to say, the existing methods for preparing nano-titanium dioxide, especially nano-sized rutile-type titanium dioxide, generally have disadvantages such as relatively complicated synthesis process, difficult conditions to control, environmental pollution, and narrow application range.

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