A preparation method for in-situ synthesis of high-concentration and strong bactericidal ZNO composite aqueous dispersion

Abstract

The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a preparation method for in-situ synthesis of high-concentration ZnO composite aqueous dispersion. First, 5,5-dimethylhydantoin is dissolved in water, a certain amount of zinc chloride is added, the solution is a turbid solution, and an alkaline regulator is added to adjust the solution to be alkaline, and the solution becomes a transparent solution, forming a Zn ion Stabilize the complex, then add the nanoparticle protective agent polyvinylpyrrolidone and sodium polyacrylate, stir evenly, continue to add the alkaline regulator, and react for a period of time to directly obtain the ZnO composite aqueous dispersion. The present invention uses 5,5-dimethylhydantoin and zinc ions to complex complex to control the reaction rate, and under the protection of polyvinylpyrrolidone and sodium polyacrylate, ZnO in a complete crystal form is successfully generated at a temperature lower than 50°C. The present invention adopts the method of in-situ complexation slow-release crystallization to prepare nano-zinc oxide particles smaller than 20nm, the strength D90 of the dispersion liquid is smaller than 100nm, the dispersion liquid can exist stably for a long time without precipitation, and the storage time is at least two years.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial preparation, and in particular relates to a method for preparing a high-concentration and high-efficiency bactericidal ZnO composite aqueous dispersion. Background technique [0002] Nano-ZnO is a new type of high-function fine inorganic product facing the 21st century. Its particle size is between 1 and 100 nanometers, also known as ultra-fine ZnO. Due to the miniaturization of particle size, the specific surface area increases sharply, which makes nano-ZnO produce surface effects, small size effects and macroscopic quantum tunneling effects that its bulk materials do not have. Therefore, nano-ZnO has special properties and new uses that cannot be compared with general ZnO products in terms of magnetism, light, electricity, chemistry, physics, sensitivity, etc. The field shows broad application prospects. [0003] It is well known that nano-oxides are prone to self-agglomeration, which mak...

AI Technical Summary

Problems solved by technology

This two-step process is more complicated than the one-step process, and due to the increase of the thermal decomposition process, the equipment investment increases, the energy consumption increases, and the product cost increases; while the hydrothermal method can directly obtain the desired product in one step, but it The reaction is carried out under high temperature and high pressure, which requires high technical equipment and is not conducive to large-scale industrial production

Most of the zinc oxide dispersions currently on the market adopt the traditional method, that is, use mechanical equipment to disperse the zinc oxide powder, but the products produced by this method have some shortcomings, such as large particle size and strength D90 value greater than 200nm , the particle size distribution is uneven, the product stability is poor and the storage time is very short, the dispersion is white milky, opaque

Images