Microencapsulation is a technology in which trace substances are encapsulated in polymer films. It is a micro-packaging technology for storing solids, liquids and gases. Specifically, it means that a certain object (core or internal phase) is completely coated with a continuous film (wall or outer phase) of various natural or synthetic polymer compounds, and the original chemical properties of the target are not damaged. And then gradually through some external stimulation or sustained release effect to make the function of the object appear again, or rely on the shielding effect of the wall to protect the core material, the diameter of the microcapsules is generally 1 ~ 500μm, the wall The thickness is 0.5 to 150 μm, and ultrafine capsules having a particle diameter of 1 μm or less have been developed. The microcapsule particles are expanded to 0.25 to 1000 μm in some examples. When the particle size of the microcapsules is less than 5 μm, it is not easy to collect due to the increase of Brownian motion; when the particle size is larger than 300 μm, the surface friction coefficient suddenly drops and the microcapsules are lost. Generally, the thickness of the capsule membrane wall is 1-30 μm. Most of the cosmetics used are 32μm and 180μm. The ultrathin wall microcapsule film wall thickness is 0.01 μm. Microcapsules improve the stability of the product and prevent mutual interference between the various components.
Microcapsule granulation technology is a technique in which a solid, liquid, and gaseous substance is embedded and sealed in a microcapsule to become a solid particulate product. The microcapsules can take on various shapes such as a sphere, a kidney, a granule, a grain, a floc, and a lumps. Inorganic materials and organic materials can be used as wall materials for microcapsules, but the most commonly used organic materials are polymers, both natural and synthetic. Microcapsules can change the existence state, quality and volume of materials; isolate the interaction between materials, protect sensitive materials; mask bad flavor, reduce volatility; control release; reduce the toxicological effects of additives.
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