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2023

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08

What is Microcapsule Technology?

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Microencapsulation technology (Microencapsulation) is a technology that microsubstances are wrapped in polymer films, and it is a micro-packaging technology that stores solids, liquids, and gases.

Specifically, it means that a certain object (core or inner phase) is completely covered with a continuous film (wall or outer phase) of various natural or synthetic polymer compounds, without any damage to the original chemical properties of the object, and then the function of the object is gradually presented outside again through some external stimulation or slow release, or the shielding effect of the capsule wall is relied on to protect the core material, the diameter of the microcapsule is generally 1 to 500 μm, and the thickness of the wall is 0.5 to 150 μm. Ultrafine capsules having a particle size of 1 μm or less have been developed. The microcapsule particles are enlarged to 0.25-1000 μm in some examples. When the particle size of microcapsules is less than 5 μm, it is not easy to collect due to the aggravation of Brownian motion, and when the particle size is greater than 300 μm, the surface friction coefficient will suddenly decrease and the microcapsule effect will be lost. The general capsule membrane wall thickness is 1-30 μm. Cosmetics are mostly used in 32μm and 180 μm. The thickness of the ultra thin wall microcapsule membrane is 0.01 μm. Foreign microcapsules have been used in covering cream, moisturizer, lipstick, eye shadow, perfume, bath soap, powder, etc. Microcapsules can improve the stability of the product and prevent the mutual interference between various components.

Use

Microcapsule: Refers to a miniature container or enclosure with a polymeric wall shell. Its size is generally 5-200μm, and its shape is various, depending on the raw material and preparation method. l Microencapsulation: The process of preparing microcapsules is called microencapsulation. l Microencapsulation technology: refers to the solid, liquid or gas embedded in tiny and sealed capsules, so that only under specific conditions will be released at a controlled rate of technology. Among them, the embedded material is called core material, including flavors, acidifiers, sweeteners, pigments, lipids, vitamins, minerals, enzymes, microorganisms, gases and other feed additives. The material that embed the core material to realize the gelatinization of microcapsules is called wall material.

Core material: can be an oil-soluble, water-soluble compound or mixture, and its state can be powder, solid, liquid or gas. Encapsulation of a wide range of species, such as cross-linking agents, catalysts, chemical reagents, chromogenic agents, wet agents, drugs, pesticides, mineral oil, aqueous solutions, dyes, pigments, detergents, food, liquid crystal, solvents, gases, hydrophobic compounds and inorganic colloids.

Wall material: natural polymer, semi-synthetic polymer and synthetic polymer materials can be used as microcapsule encapsulation materials. Depending on the nature of the encapsulated material (core), oil-soluble core material should be water-soluble encapsulation material, while water-soluble core material should be oil-soluble encapsulation material, I .e. the encapsulation material should not react with and be miscible with the core material. The properties of the polymer encapsulation material itself are also factors to be considered in selecting the encapsulation material, such as permeability, stability, solubility, polymerizability, viscosity, electrical properties, moisture absorption and film-forming properties.

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