TPE Soft Adhesive Applied to Medical Accessories Dechuang Chemical
Source：德創化工Time：2020-03-14Hits：2136
More and more medical device manufacturers tend to choose thermoplastic elastomer (TPE) materials for products requiring flexibility or rubber elasticity. These compounds have become substitutes for thermosetting rubber and PVC, and are used in many medical devices, such as pipes, medical bags, masks, plugs, gaskets, seals, etc. As the value of TPE is more widely recognized, more and more TPE manufacturers use these elastomers in new medical applications.
Everyone knows SEBS has poor fluidity, so it needs to be filled with oil when making TPE, but TPE made of medical materials such as infusion bag, infusion tube, etc. is usually not filled with oil.
As for the reason of not filling oil, we must all know. The requirements for making medical devices are very strict. Biocompatibility, cytotoxicity, sensitization, carcinogenicity, etc. should be measured, and the causes are often small molecules. Macromolecules are often stable and will not cause much impact. Besides various inorganic salts, TPR elastomer oil is an important source of small molecules.
In fact, the infusion bag is not only a thin film, there are three layers less and five layers more. Each layer is different, although it is SEBS PP substrate, but the proportion is different. Some TPV manufacturers will think that I have 3-5 layers of film for infusion bags, as long as the innermost layer is not filled with oil, and the outer layer is not affected by oil filling. However, unfortunately, the oil does not stay on the outer membrane so obediently, it will always permeate, so as long as there is one layer of oil, it will slowly permeate to all layers.
