一种单分散纳米二氧化硅的化学沉淀法生产工艺

Monodisperse nano-silica production process by chemical precipitation method

Abstract

The invention discloses a monodisperse nano-silica production process by a chemical precipitation method. The chemical precipitation method is combined with high dispersion of a surfactant, tetraethoxysilane is used as a raw material for the first time on the basis of earlier literature, ammonia water is used as a catalyst, and monodisperse nano-silica particles are prepared by reasonably controlling reaction conditions. The monodisperse nano-silica production process has the advantages of simple experimental equipment, operation convenience, low surfactant consumption, good stability and the like, overcomes shortcomings that the size of particles is difficult to control and uneven in distribution, the particles are easy to agglomerate and the like in the traditional preparation method, and has industrial popularization and practical application values. In addition, nano-silica prepared in the process has high monodispersion, and the size of the nano-silica is uniform and controllable. Besides, interface bonding of the nano-silica and a polymer matrix is strengthened, carrying capacity of a polymer is improved, and accordingly the purpose of strengthening the toughening polymer is achieved.
本发明采用化学沉淀法,结合表面活性剂的高度分散作用,在前期文献的基础上,第一次尝试以正硅酸乙酯为原料,氨水为催化剂,通过合理地控制反应条件,制备了单分散球形纳米二氧化硅颗粒。本发明具有实验设备简单、操作方便、表面活性剂用量少、稳定性好等优点,克服了传统制备方法存在的微粒大小难以控制、易团聚和粒度分布不均匀等缺点,具有工业推广及实际应用价值。本发明的纳米二氧化硅具有高度单分散、粒度均匀可控的特性。本产品主要用于增强与聚合物基体的界面结合,提高聚合物的承载能力,从而达到增强增韧聚合物的目的。

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