Calcium chloride desiccant is a commonly used moisture-adsorbing material, often employed to absorb humidity from the air to achieve a dehumidifying effect. Its main principles can be summarized as follows:

1. Moisture Absorption Reaction: Calcium chloride has strong hydrophilic properties. When exposed to humid air, it absorbs moisture from the surrounding environment through a hygroscopic reaction. This occurs because the structure of calcium chloride contains hydrates, which form compounds with environmental moisture, thereby adsorbing water.

2. Moisture Absorption Capacity: As a desiccant, calcium chloride has a high moisture absorption capacity, allowing it to absorb humidity from the air until saturated. When calcium chloride reaches saturation, visible condensation or crystallization may appear. To prevent liquid leakage, gel starch and superabsorbent polymers are added to convert the absorbed water into a gel-like substance.