The performance of pvc film changes due to the different plasticizers used, and the film performance is related to the chemical structure of the plasticizer.When the film is required to have certain special properties, it is very complicated to determine the film formulation, and some requirements for the film are sometimes contradictory.It is very difficult to make a film with good cold resistance and flame retardancy. If oil resistance is also required, the various plasticizers currently known cannot meet the requirements.Therefore, it is necessary to select an appropriate plasticizer ratio when manufacturing the film, and use the method of complementing each other to make up for the defects of various plasticizers to meet the requirements of use.
Generally, the plasticizer content of PVC soft film is 18-45%. When the plasticizer is used as a processing aid, when the addition amount is less than 18%, a peculiar phenomenon can be seen, that is, the film with this content is not softer than pure PVC hard film but more brittle.Its impact strength and cold resistance are worse than pure PVC hard film.This phenomenon may be due to the small amount of plasticizer, which may not "eliminate the polarity of the polyvinyl chloride molecule."
The higher the plasticizer content of the film, the more obvious the impact on the performance of the film. In order to achieve the same softness, if the plasticizer used is different, the added amount is also different.In the comparative test of different films, the film with the same hardness is often used as the benchmark, rather than the film with the same plasticizer content as the benchmark.
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