Medicinal desiccant is a kind of dewatering agent that absorbs moisture from the atmosphere. The silica gel of medicinal silica gel-type desiccant is a neutral substance, and will not react with strong alkalis and strong acids under certain conditions. Reacts with any other substance. At the same time, silica gel is also the only desiccant that has passed the US FDA certification and can be used in direct contact with drugs and food. It is one of the ideal raw materials for medicine desiccant.
In addition to silica gel, medicinal desiccants also use fiber desiccant tablets as raw materials, which are small in size, high in moisture absorption, safe and non-toxic.
Features of medicinal desiccants
Medicinal desiccants have high sanitary requirements (industry license), and the packaging materials have passed the US FDA demonstration. The product is compact, efficient, exquisite and environmentally friendly, with good compatibility and chemical stability.
Most of these desiccants use silica gel desiccants, and silica gel desiccants are non-toxic, odorless, non-corrosive, and have strong absorption. Now many companies produce silica gel desiccants that have passed the SGS certification and are often used for storage. For more expensive medicinal materials such as cinnamon, the general usage is to put the medicinal materials in a wooden box with built-in aluminum skin, and then put this kind of desiccant, and then store it in an airtight manner.
Medicinal silica gel desiccant is a kind of highly active adsorption material, usually prepared by reacting sodium silicate and sulfuric acid, and after a series of post-treatment processes such as aging and acid foaming. Silica gel is an amorphous substance, and its chemical formula is mSiO2·nH2O. It is insoluble in water and any solvents, non-toxic, tasteless, chemically stable, and does not react with any substances except strong alkalis and hydrofluoric acid.
Various types of medicinal silica gel desiccants form different microporous structures due to their different manufacturing methods. The chemical composition and physical structure of silica gel determine that it has many characteristics that other similar materials are difficult to replace: high adsorption performance, good thermal stability, stable chemical properties, and high mechanical strength.
This type of desiccant is divided into: macroporous silica gel, coarse pore silica gel, B-type silica gel, and fine pore silica gel according to the size of its pore size. Due to the difference in pore structure, their adsorption properties have their own characteristics.
Coarse-pored silica gel has a higher adsorption capacity when the relative humidity is high, while fine-pored silica gel has a higher absorption capacity than coarse-pored silica gel when the relative humidity is low. Type B silica gel has a larger pore structure between coarse and fine pores. Between the pores, the adsorption capacity is also between the coarse and fine pores. Macroporous medicinal silica gel desiccant is generally used as catalyst carrier, matting agent, toothpaste abrasive and so on. Therefore, different varieties should be selected according to different uses.
Since silica gel desiccants are granular substances, in the past, medicinal desiccant manufacturers have used bags or cans to package silica gel desiccants. However, the use of paper bags to package desiccants has some disadvantages: on the one hand, the paper bags are easy to break, and if the leaked silica particles are eaten by mistake, it will endanger human health; on the other hand, the use of bagged medicinal desiccants requires pharmaceutical packaging The space is large, so it causes inconvenience in use for medicines with limited packaging space. For example, when people open the medicine bottle, they often encounter the situation that the bag of this type of desiccant is stuck in the mouth of the bottle and cannot be poured out. .
Two new types of medicinal desiccants have appeared on the market, one is a desiccant in a plastic cylinder, and the other is a flake desiccant.
