Preparation method for photosensitive and amphiphilic polyurethane-stabilized nano-zinc oxide

Abstract

The invention relates to inorganic nano-material preparing, particularly to a preparation method for photosensitive and amphiphilic polyurethane-stabilized nano-zinc oxide, wherein a new photosensitive and amphiphilic polyurethane is adopted to carry out coating, an inverse emulsion technology is adopted to prepare the nano-zinc oxide, such that the photosensitive and amphiphilic polyurethane-stabilized nano-zinc oxide is formed. The novel nano-zinc oxide synthesized through the method provided by the present invention has a particle size of 20-800 nm, can be regulated through simply controlling reaction conditions (such as reactant concentrations, ultrasonic emulsification power and the like), and has good dispersity and good dispersion stability in an organic solvent system. The synthesis method for the photosensitive and amphiphilic polyurethane prepolymer has characteristics of simpleness, controllable process, easy availability of the raw materials, non toxicity and harm, and easy industrial production. The prepared nano-ZnO can be adopted as a functional nano-filler in various polymer systems, such that characteristics of anti-ultraviolet property, mechanical property and the like of the polymer can be improved.

Description

technical field [0001] The invention relates to the preparation of inorganic nanometer materials, in particular to a method for preparing zinc oxide particles with photosensitive amphiphilic polyurethane as surface modification by using inverse emulsion technology under the coating of a new photosensitive amphiphilic polyurethane. Background technique [0002] Nano-zinc oxide (ZnO) has the ability to absorb, scatter ultraviolet light and photocatalyze, and has a wide range of applications in the fields of anti-ultraviolet coatings, photocatalytic environmental protection materials and so on. However, due to the large specific surface area and high specific surface energy of nanoparticles, the agglomeration of particles is very easy to occur in the process of preparation and application. Therefore, how to modify the surface of nanoparticles to solve the problem of agglomeration is currently a hot spot in the field of nano-zinc oxide research. . Generally, two routes are used...

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area and high specific surface energy of nanoparticles, the agglomeration of particles is very easy to occur in the process of preparation and application. Therefore, how to modify the surface of nanoparticles to solve the problem of agglomeration is currently a hot spot in the field of nano-zinc oxide research.

Generally, two routes are used to modify the surface of nano-zinc oxide: one is to modify the surface of the generated nano-zinc oxide. The commonly used modifiers include silane coupling agent, organic small molecule surfactant, amphiphilic The main problem of this method is that the modification process is relatively complicated, involving the dispersion of nano-zinc oxide, and the removal of residual modifier molecules is also a relatively big problem; In-situ generation of organic surface-modified nano-zinc oxide in the presence of organic phases such as segment copolymers. This method has the advantages of relatively simple process, and the in-situ generation of nano-zinc oxide does not require redispersion. The synthesized nano-zinc oxide has a small particle size and high modification efficiency. High, good dispersion and stability of nano-zinc oxide, has been widely concerned by researchers at home and abroad

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