Desiccant Classification Introduction
Calcium chloride
Calcium chloride desiccant is a kind of high-efficiency adsorption material, the main components are calcium chloride and gum starch. Chemically reacts water molecules with calcium chloride to absorb moisture from the surrounding environment and transform it into a gel to achieve the adsorption effect, thus completely eliminating any possibility of leakage. The common silica gel desiccant can only absorb 10%-27% of its own weight, while the calcium chloride desiccant can reach 300%. The moisture absorption rate is 8-15 times that of ordinary desiccants.
After completely absorbing moisture, it will not evaporate. After ordinary desiccant absorbs moisture, when encountering high temperature, water vapor will evaporate and re-enter into the air. Because calcium chloride desiccant can fuse water vapor and calcium chloride into a gel, it is not easy to evaporate.
It can be used at an ambient temperature of -5℃~90℃. The active ingredient of calcium chloride desiccant has good stability and is difficult to react with other substances except water. It can be used in almost all marine environments.
Silica gel
It is a kind of highly active adsorption material, the main component is silica, it is a kind of highly active adsorption material. It is usually prepared by reacting sodium silicate with sulfuric acid and undergoing a series of post-treatment processes such as aging and acid foaming. Silica gel is an amorphous substance, its shape is transparent and irregular sphere, and its chemical formula is mSiO2.nH2O.
The chemical composition and physical structure of silica gel determine that it has many characteristics that are difficult to replace with other similar materials: high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength. The inside of silica gel desiccant is a very fine pore network structure. These pores can absorb water and retain water through its physical attraction. As a desiccant, it is widely used in aviation parts, computer devices, electronic products, and leather. Dry and moisture-proof in industries such as products, medicine and food. Even if the silica gel desiccant is completely immersed in water, it will not soften or liquefy. It is non-toxic, odorless, non-corrosive and non-polluting, so it can be in direct contact with any object.
The most suitable hygroscopic environment for silica gel desiccant is room temperature (20~32℃), high temperature (60~90℃), it can reduce the relative humidity of the environment to about 40%, so the desiccant application range is very wide.
The safety performance of silica gel: silica gel can have a drying effect on human skin. Therefore, you should wear work clothes during operation. If silica gel gets into your eyes, rinse with plenty of water and seek medical treatment as soon as possible. Silica gel desiccant is the only desiccant that has passed the US FDA certification and can be used directly in contact with food and medicine. After accidental ingestion, it will not cause harm to the human body, nor will it be absorbed by the human body, and it can be naturally excreted with feces.
