The medicinal bottle cap mainly functions to seal the mouth of the bottle. So, what raw materials are generally used for the production of bottle caps?
The commonly used processing material for pharmaceutical bottle caps is polypropylene, which is a colorless, odorless, non-toxic, and translucent solid substance, which is one of the four general materials. The main feature of polypropylene is its low density, its mechanical properties are better than that of low-pressure polyethylene, and it has outstanding rigidity and better heat resistance. It can be used above 100°C, basically does not absorb water, and has good chemical stability. It is almost stable except for concentrated sulfuric acid and concentrated nitric acid. High-frequency electrical performance is excellent, and it is not affected by temperature, and it is easy to form.
In practical applications, polypropylene can be modified by copolymerization, crosslinking, grafting, adding nucleating agents, etc. to change the polypropylene polymer components and macromolecular structure or crystal configuration to improve its mechanical Performance, heat resistance, aging resistance, etc., improve its comprehensive performance and expand its application fields.
At present, most of the pharmaceutical bottle caps are selected polypropylene raw materials, and its various excellent properties can meet the requirements of the caps for sealing, easy processing and molding, and automated production, and have a high cost performance.
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