We all know that some food packaging bags, pet food packaging, and nut zipper pouches have a pack of desiccant and are marked as “not edible”. What role does desiccant play? It is obviously to reduce the humidity of the food in the package and prevent the food from spoiling and rot. Desiccants can also be broadly classified into five categories.
1. Silica gel desiccant
The silica gel desiccant is a high-porosity structured hydrous silica which has the characteristics of colorless, odorless and non-toxic, stable in chemical properties and good in moisture absorption performance. Widely used in instruments, instruments, leather, luggage, food, textiles, equipment and so on. Its role is to control the relative humidity of the environment during storage and transportation to prevent moisture, mildew and rust. The main concern is that this is the only approved desiccant in the EU.
2. Fiber desiccant
The most important feature of fiber desiccant is that it is made of pure natural plant fiber and refined by special techniques. It is worth mentioning that the coated fiber desiccant tablet saves space and is convenient and practical. Its moisture absorption capacity is equivalent to its own weight, which is much higher than that of other desiccants. Because of its moderate price, safety and hygiene, it is the best choice for many health products, medicines and biological desiccants.
3. Montmorillonite desiccant
Montmorillonite desiccant is widely used in medical care, food packaging, optical instruments, electronic products, military products, and civilian products that cannot be sealed by oil or weather. Due to the use of pure natural raw material bentonite, it has the characteristics of strong adsorption, fast adsorption, tasteless, non-toxic, no environmental pollution, no contact corrosion, green, odorless, non-toxic, no damage to the human body, good adsorption performance, and adsorption activity. Static dehumidification and odor removal.
4. Quicklime desiccant
In the chemistry class of quicklime desiccant, quicklime is mentioned, and its main component is calcium oxide. Water absorption is achieved by chemical reaction, which is irreversible. The most common is the use of such desiccants in "snow cake" and "shrimp strips". In addition, it is also commonly used in electrical appliances, leather, clothing, shoes, tea, etc., but because the quicklime is a strong alkali, it is very corrosive. When the eyes of the elderly and children are injured, it is gradually being eliminated.
5. Calcium chloride desiccant
Calcium chloride desiccant is mainly made of high quality calcium carbonate and hydrochloric acid as raw materials, refined by reaction synthesis, filtration, evaporation, concentration and drying. It is used as calcium strengthening agent, chelating agent, curing agent and desiccant in food industry. Wait. It is also used as a desiccant for gases to produce dehydrating agents for ethers, alcohols, propylene resins, and the like. Calcium chloride is mostly porous, granular or honeycomb material, odorless, slightly bitter taste, soluble in water and colorless.