In the production of PVC plastics, most of the films used for processing are mainly composed of carbon and hydrogen, chlorine content (about 57% by weight) and carbon. The presence of chlorine in the molecule makes PVC plastics not only used in plastic production and processing, but also It makes its use more extensive, such as: beauty industry, electrical industry and so on. Because chlorine makes it compatible with a variety of other materials, chlorine content also contributes to PVC flame retardancy. PVC materials can be molded by many techniques and use little energy to make the final product form. PVC polymers are chemically stable. PVC formulations have a wide range of applications, including the most sensitive areas such as medical equipment, construction, automotive and cable.
PVC, PE, PP and PS are general-purpose plastics. These materials are used in various fields in the application of blister packaging. Among the PVC raw materials that are mainly discussed in this article, its molecular structure has an amorphous structure with polar chlorine atoms, and has Chlorine atoms and amorphous molecular structures are inseparable. Although plastics appear to be very similar in everyday use environments, PVC has completely different characteristics in terms of performance and function than olefin plastics, which have only carbon and hydrogen atoms in the molecular structure. The chemical stability of molecular structures of general-purpose plastics is due to substances containing halogens such as chlorine and fluorine. These constituent structures have flame retardancy, durability, and oil and chemical resistance.
Flame Retardancy of PVC Blister: PVC has excellent flame retardant properties due to its chlorine content, even in the absence of flame retardant. For example, the ignition temperature of PVC is as high as 455°C. Therefore, PVC blister can not be replaced by other blister materials in certain specific fields. In addition, compared with other materials, PVC material significantly reduces the heat released from combustion to PE and PP. Therefore, even when burning, the flame heat of the PVC is less transmitted to nearby materials.
PVC plastic durability: under normal conditions of use, the factors that affect the durability of the material are the strongest and are therefore affected by atmospheric oxygen. PVC, which has a molecular structure in which chlorine atoms are bonded to other carbon chains, has a high degree of antioxidative reactivity and maintains its properties over a long period of time. Other common plastics having a structure consisting only of carbon and hydrogen are more prone to oxidative degradation in prolonged use conditions (eg, by repeated recycling). The results of the 35-year underground PVC pipe survey taken by the Japan PVC Pipe Association show that its performance is not deteriorated and its strength is the same as that of the new German pipe. German studies have shown that they have been excavating buried pipelines that have been analyzed for more than 60 years. The test results show that these PVC pipes still maintain good performance. It is estimated that these products may be used for 50 years. PVC blister contrast PET blister, PP blister with a longer storage properties of the Hu. According to our tests, it is proved that PVC is blistered at the same temperature and in the same environment as PET blister and PS blister. One year after storage, comparing them, it is obvious that the blister of some materials has weathered very easily broken, but PVC has almost no effect and can still be used normally.
The use of PVC for plastics production is not limited to the packaging industry. Many cars or large parts and components are made of thick sheet PVC plastic. Because PVC has some very obvious features above, PVC blister cannot be replaced by other blister in certain industries.
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