Controllable slow-release phase transfer catalyst microcapsules and preparation method of controllable slow-release phase transfer catalyst microcapsules

Abstract

The invention relates to controllable slow-release phase transfer catalyst microcapsules and a preparation method of the controllable slow-release phase transfer catalyst microcapsules. The method comprises the following steps: sufficiently stirring sodium dodecyl sulfate, polyethylene glycol 6000, a phase transfer catalyst, a strong oxidant, an auxiliary surfactant, ethanol, a pH (Potential of Hydrogen) value regulator and a pyrrole monomer into de-ionized water solution under a room-temperature condition; centrifuging and drying to obtain the phase transfer catalyst microcapsules. Reaction is carried out on the de-ionized water so that an oil-soluble core material is easily subjected to phase transfer catalyst microencapsulation; a preparation process of the controllable slow-release phase transfer catalyst microcapsules is not only limited in the de-ionized water, and the phase transfer catalyst microcapsules with a water-soluble core material can also be prepared in an oily solvent system; a core material phase transfer catalyst is not limited to 2,2'-azobis(2-methylpropionitrile) and can be any one of ammonium persulfate, benzoyl peroxide, tert-butyl hydroperoxide, tert-butyl peroxybenzoate and diisopropyl peroxydicarbonate.

Description

technical field [0001] The invention belongs to the technical field of phase transfer catalysis, relates to a phase transfer catalysis microcapsule, in particular to a controllable slow-release phase transfer catalysis microcapsule and a preparation method thereof. Background technique [0002] The traditional phase transfer catalytic reaction mainly uses the phase transfer catalyst cetyltrimethylammonium bromide, and the traditional phase transfer catalytic technology mainly occurs in two immiscible phases in the same container, through phase transfer Catalyst, which transfers one phase of the dominant reaction to the other phase, so that the two chemical substances come into contact and collide to produce a chemical reaction. The biggest disadvantage of this method is that if there is no phase transfer catalyst, two immiscible phases cannot come into contact, and the other two substances will not come into contact together, so that a chemical reaction occurs. Traditional p...

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Problems solved by technology

The biggest disadvantage of this method is that if there is no phase transfer catalyst, two immiscible phases cannot come into contact, and the other two substances will not come into contact together, so that a chemical reaction occurs. Traditional phase transfer catalysis The method has higher requirements on the phase transfer catalyst, which must have a certain surface activity. It simply transfers the chemical substances in one phase to another phase, and does not participate in the chemical reaction itself.

The traditional phase transfer catalytic method has the following problems: (1) The chemical properties and physical stability of the exposed phase transfer catalyst are relatively poor, and it has a certain chemical taste; (2) The phase transfer catalyst in the form of liquid, gas or aerosol Difficult to store; (3) volatile phase transfer catalysts are volatile; (4) Some core materials are not well dispersed in aqueous solution or other solutions, or even agglomerated together; etc.

[0003] Microcapsule is a tiny container with a core-shell structure. Microcapsule technology is the technology of microencapsulating the core material. At present, microcapsule technology has been widely used in the fields of pharmaceuticals, chemical engineering and materials, but about the application in phase transfer catalysis There are not many reports on

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