Related introdution
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More than 45% of the films containing plasticizers are difficult to manufacture, with low strength, high elongation, and stickiness, and are therefore rarely produced. The higher the plasticizer content in the membrane, the more obvious the effect on the membrane performance. In order to achieve the same softness, if different plasticizers are used, the amount of addition is not the same. In comparison tests of different membranes, the membranes with the same hardness are usually used as reference, but the plasticizing agent content of the same membrane is not used as reference.
knowlege
It is difficult to make a film that is cold resistant and difficult to burn, and if oil resistance is also required, the use of many plasticizers currently known will not meet the requirements. Therefore, the manufacture of the film must select an appropriate proportion of plasticizers and compensate for the defects of various plasticizers by complementing each other to meet the requirements of use. Usually, the plasticizer content of PVC soft film is 18 to 45%. When the plasticizer is used as a processing assistant, the amount added is less than 18%, and you will see a strange phenomenon, that is, the content of the film is not softer than pure PVC dura film, but more brittle. Its impact strength and cold resistance is worse than pure PVC dura film. This phenomenon may be due to the low amount of plasticizer, which is unable to "eliminate" the polarity of PVC molecules. Plasticizer content less than 18% to 20% of the film is not made of pure PVC, but is usually not brittle impact resistant PVC.
