Introduction to commonly used materials for microcapsule preparation

　　Common materials for microcapsule preparation include natural polymers (such as gelatin and gum arabic), semi-synthetic polymers (such as carboxymethyl cellulose), and fully synthetic polymers (such as polyvinyl alcohol and polyamide).

　　I. Natural Polymers

　　Natural polymers are one of the commonly used wall materials in microcapsule preparation. These materials are widely sourced, have good biocompatibility, and excellent degradability. Common natural polymers include gelatin, gum arabic, and alginate. Gelatin is a collagen hydrolysate extracted from animal skin and bones, has good film-forming properties, and is often used to prepare microcapsules. Gum arabic is a natural plant gum with good emulsification stability and film-forming properties, and is also often used as a wall material for microcapsules.

　　II. Semi-synthetic Polymers

　　Semi-synthetic polymers are obtained by chemically modifying natural polymers. These materials retain some of the excellent properties of natural polymers while also imparting new characteristics. Carboxymethyl cellulose is a typical semi-synthetic polymer, obtained by chemical modification of natural cellulose. It has excellent thickening, emulsification, and stabilization properties and is widely used in microcapsule preparation.

　　III. Fully Synthetic Polymers

　　Fully synthetic polymers are polymeric compounds prepared by chemical synthesis. These materials have stable structures and controllable properties and can be customized as needed. Commonly used fully synthetic polymers in microcapsule preparation include polyvinyl alcohol, polyamide, and polyester. Polyvinyl alcohol has good film-forming and water solubility properties and is one of the commonly used materials for preparing microcapsules. Polyamide is widely used in microcapsule preparation due to its excellent mechanical properties and chemical corrosion resistance.

　　IV. Other Auxiliary Materials

　　In addition to the main wall materials mentioned above, other auxiliary materials may also be used in the preparation of microcapsules. For example, to adjust the release properties of microcapsules, some sustained-release agents or controlled-release agents may be added; to improve the stability of microcapsules, cross-linking agents or stabilizers may be used. These auxiliary materials play an important role in the preparation of microcapsules and affect the final performance of the microcapsules.

　　In summary, commonly used materials for microcapsule preparation include natural polymers, semi-synthetic polymers, and fully synthetic polymers. The selection and use of these materials have a significant impact on the performance and application range of microcapsules. By thoroughly understanding the properties and characteristics of these materials, the preparation process of microcapsules can be better optimized, and their application effects can be improved.