Preparation method for amphiphilic nanometer particle and application of amphiphilic nanometer particle to prepare Pickering emulsion

Abstract

The invention relates to a preparation method for an amphiphilic nanometer particle and application of amphiphilic nanometer particle to prepare Pickering emulsion. The novel amphiphilic nanometer particle is formed according to the following preparation method: firstly performing epoxy-group modification on the surface of a nanometer particle by employing a silane coupling agent, then utilizing hexylenediamine to react with epoxy groups, so as to further introduce amino groups, and finally adding proper amount of hydrochloric acid for neutralization. The particle is capable of replacing conventional surfactants for preparing highly-stable Pickering emulsions of silicone oil / water and or toluene / water. The amphiphilic nanometer particle is simple in preparation technology, good in stability and uneasy for being influenced by temperature, pH value, salinity and other factors, and therefore the amphiphilic nanometer particle possesses great application prospect and industrialization capability. The preparation method of the emulsion can be further expanded for preparing different oil / water emulsions, and even has potential application prospect in emulsion polymerization field.

Description

technical field [0001] The invention relates to an amphiphilic nano particle, in particular to a method for preparing the amphiphilic nano particle and its application in preparing Pickering emulsion. Background technique [0002] The traditional emulsion is prepared by adding a surfactant to mutually incompatible oil / water, and the unique amphiphilic molecular structure of the surfactant enriches the surfactant at the oil / water interface, thereby stabilizing the emulsion role. However, many researchers have found that the stability of the emulsion prepared by surfactant is not ideal, and it is easily affected by factors such as temperature, pH value, salt concentration, oil phase composition, etc., resulting in emulsion breakage. In addition, some surfactants also have certain toxicity, which is harmful to animals, plants, and even human body, which greatly limits the practical application of surfactants. [0003] In recent years, some researchers have proposed that amphi...

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Problems solved by technology

[0004] So far, solid particles with amphiphilic structure are mainly grafted polymer molecules with relatively complex structures onto the surface of solid particles. This surface modification method is complicated to operate and the reaction conditions are harsh. Greatly improve the cost of particles, the preparation steps of the particles are also very cumbersome and not suitable for large-scale production, which greatly limits the promotion and practical application of Pickering emulsification technology (C.J.Lin, R.A.Sperling, J.K.Li, etal.Small, 2008, 4, 334-341; E.R. Zubarev, J. Xu, A. Sayyad, et al. J. Am. Chem. Soc. 2006, 128, 4958-4959; J. Shan, M. Nuopponen, H. Jiang, et al. Macromolecules, 2005 ,38,2918-2926.)

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