Dual-core microcapsule, preparation method and application thereof

Abstract

The invention discloses a dual-core microcapsule, a preparation method and application thereof. The preparation method of the dual-core microcapsule comprises the steps of stirring and mixing melamine and a formaldehyde solution, adjusting pH value of a system to 8-9, heating and stirring a mixed solution of melamine and formaldehyde in a water bath with a temperature of 65-75 DEG C, and adding distilled water to react to obtain a water-soluble melamine-formaldehyde prepolymer; then mixing and stirring the water-soluble melamine-formaldehyde prepolymer and an emulsifying agent according to a ratio till the water-soluble melamine-formaldehyde prepolymer and the emulsifying agent are completely dissolved; adjusting pH value, adding a first core material to react to obtain a melamine-formaldehyde resin microcapsule with a particle diameter of 0.1-300 microns; adding the melamine-formaldehyde resin microcapsule and a second core material into a chitosan solution to form liquid drops by using an injection pump, collecting the liquid drops in a CaCl2 solution and curing for 0.5-3 hours, thus obtaining a dual-core microcapsule with a spherical shape and a particle diameter of 0.1-1000 microns. Through the dual-core microcapsule, the release rate of active core materials can be greatly reduced; and interaction of the core materials is small.

Description

technical field [0001] The invention relates to a microcapsule, in particular to a dual-core microcapsule and its preparation method and application; the dual-core microcapsule is suitable for application in food, cosmetics and functional materials. Background technique [0002] Although microcapsule technology began in the 1930s, it has developed very rapidly. So far, it has been widely used in food, medicine, cosmetics and other fields. Microcapsule technology refers to the technology of encapsulating solid, liquid or gas in tiny and sealed capsules so that they can be released at a certain rate under specific conditions. Among them, the substance to be encapsulated is called the core material, and the substance that encapsulates the core material to achieve microencapsulation is called the wall material. The core material can be oil-soluble or water-soluble compound or mixture, and its state can be powder, solid, liquid or gas. After research, it is found that there ar...

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Problems solved by technology

[0003] However, there are the following problems in the application of ordinary microcapsules in the fields of protection of active substances and fixed-point targeted release: (1) Limited by the inert substances in the shell layer, ordinary microcapsules can only effectively protect active substances in a certain external environment. It is difficult to cope with the damage of shell materials by different environmental conditions, and its application in targeted release in specific fields is limited; (2) The release rate curve of ordinary microcapsule active substances is normally distributed, and it is difficult to maintain a stable rate at a certain rate. (3) Ordinary microcapsules have poor sealing effect when encapsulating a variety of core materials, and the core materials affect each other, making it difficult to achieve hierarchical release

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