Double-shell microcapsule and its preparation method and use

Abstract

The invention discloses a double-shell microcapsule and its preparation method and use. The preparation method comprises orderly adding and mixing melamine and a formaldehyde solution according to a mole ratio of 1: 3-5, adding distilled water into the mixed solution to obtain a melamine-formaldehyde performed polymer, wherein the mass of the distilled water is 1-3 times that of the formaldehyde solution, adding the melamine-formaldehyde performed polymer and an emulsifier into a reactor according to a ratio of 100: 20-30, adjusting pH to 1-6, adding a solvent-curing agent-core material homogeneous mixture with a mass ratio of 1: 1: 3 to 1: 2: 12 into the reactor, wherein the total mass of the homogeneous mixture is 1-2.5 times that of the melamine-formaldehyde performed polymer, carrying out emulsification for 20-50min, heating the emulsion to more than 40 DEG C, carrying out a reaction process for 3-5h and adjusting pH to greater than or equal to 6. The double-shell microcapsule has good mechanical properties, guarantees product quality stability and storage stability and has a wide raw material source and a low shell raw material price. The preparation method has simple processes, can be used in the fields of foods, drugs and cosmetics, can be widely used in the field of functional materials and widens a microcapsule usage scope.

Description

technical field [0001] The invention relates to a double-shell microcapsule and its preparation method and application. The double-shell 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 are many kinds of substances ...

AI Technical Summary

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) ordinary microcapsules can only effectively protect active substances in a certain external environment due to the limitation of inert substances in the shell, and the single wall It is difficult for the shell material to cope with the damage of different environmental conditions to the shell material, which is not conducive to long-term storage; (2) in the process of processing, the mechanical properties and resistance (high temperature and solvent, etc.) The application of tropism release is limited; (3) the release rate curve of common microcapsule active substances is normally distributed, and it is difficult to maintain stability at a certain rate; (4) when common microcapsules encapsulate a variety of core materials, there are The sealing effect is poor, and the core materials interact with each other, making it difficult to achieve hierarchical release

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