Preparation method of continuous controllable monodispersed silica microspheres

Abstract

The invention discloses a preparation method of continuous controllable monodispersed silica microspheres, and the process includes the steps of nucleation, growth and separation. The process can achieve batching preparation of the monodispersed silica microspheres with high degree of sphericity and narrow particle size distribution; according to the method, in the nucleation step of silica microsphere seeds, a reaction system is a boiling system, heat transfer and mass transfer are good in a strong convective state, the silica microsphere seeds can homogeneously and rapidly nucleate, the agglomeration problem in the prior art can be solved, the reaction time is shortened, and monodispersed microsphere seeds with narrower particle size distribution can be obtained. The monodispersed silica microspheres with high degree of sphericity and controllable particle size distribution can be obtained by one step growth or multi step growth to separate the steps of nucleation and growth, the particle size distribution deviation is less than 2%, and the performance is better. According to the actual need, monodispersed silica microspheres with various particle sizes from 20 to 10000nm can be obtained, and various problems of the prior art can be overcome.

Description

technical field [0001] The invention relates to a preparation method of silica microspheres, in particular to a continuous controllable preparation method of monodisperse silica microspheres with a particle size distribution of 20-10000nm. Background technique [0002] Monodisperse silica microspheres are non-toxic, odorless, non-polluting non-metallic materials with surface effect, small size, effect quantum size effect and macroscopic quantum tunnel effect, and produce singular mechanics, electricity, magnetism, Special properties such as optics, heat and chemistry have special significance in the field of science and technology, and have broad application prospects in many scientific fields such as standardization, information and information, analytical chemistry, medicine and biochemistry, electronic packaging materials, and polymer composite materials. [0003] In recent years, the preparation methods of monodisperse spherical nano-silica include gas phase method, prec...

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Problems solved by technology

Yoki et al. found a method to prepare nano-scale monodisperse silica with amino acids, but the reaction time is too long and the efficiency is low