Preparation method of silicon oxide nanoparticles with uniform particle sizes

Abstract

The invention discloses a preparation method of silicon dioxide nanoparticles with uniform particle sizes. The preparation method at least comprises the following steps: a) acquiring an orthosilicic acid solution; b) mixing the orthosilicic acid solution in the step a), an organic silicon source and an alcohol solvent to obtain an organic-inorganic hybrid solution; and c) mixing the organic-inorganic hybrid solution in the step b) with an alkaline solution, and carrying out an aging reaction to obtain the required silicon dioxide nanoparticles with uniform particle sizes. According to the preparation method, the purity of nanometer silicon oxide is improved, scale-controllable and uniformity-controllable preparation of the silicon dioxide nanoparticles is effectively realized, the large-scale preparation of the silicon dioxide nanoparticles can be realized, and the mildness, stability and controllability of the synthesis conditions of the silicon dioxide particles can be realized; and therefore, the batch stability of the silicon dioxide nanoparticles is easy to realize.

Description

technical field [0001] The application relates to a method for preparing nano-silica with uniform particle size, which belongs to the field of preparation of silica nano-materials. Background technique [0002] Nano-silica is amorphous silica with a particle size of nanometer (generally 1-200nm), and is a non-toxic, odorless, and non-polluting non-metallic oxide material. Nano-silica has small particle size, large specific surface area, moderate hardness, and excellent chemical properties. At the same time, nano-silica particles have physical or chemical properties with polymers due to surface defects and many non-pairing atoms. The chemical combination is more likely, so it can also be used to enhance the interfacial combination with the polymer matrix, improve the load-bearing capacity of the polymer, and thus strengthen the toughened polymer. Therefore, nano silicon oxide is widely used in integrated circuit manufacturing, rubber, chemical industry, special coatings, tex...

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Problems solved by technology

However, since the microemulsion method uses two phases and its particle size is greatly affected by factors such as the stirring speed and the form of the stirring paddle

Therefore, in the large-scale production process, the amplification effect of this preparation method is large, and it is difficult to scale up

The particle size of the scale-up produced silica spheres is not only unevenly distributed, but also has poor batch repeatability

[0008] Inorganic silicon sources obtain orthosilicic acid monomers by means of ion exchange, and then regulate the particle growth process of silica particles by means of orthosilicic acid polymerization, so that the synthesis of silica nanoparticles can be regulated and controlled. However, the raw materials in this preparation process Silicic acid has the characteristics of high activity, easy agglomeration, and instability. Generally, water glass will inevitably introduce metal impurity ions, resulting in the aggregation of orthosilicic acid to varying degrees, resulting in the size, uniformity, and surface properties of nano-silica particles. There is a big difference, especially in the process of regulating the scale by the seed crystal method, these impurity ions will cause the nucleation and growth of silicon oxide particles to mismatch, making it difficult to control the uniformity and particle morphology of nanoparticles

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