What Role Does Oxidized Polyethylene Wax Play in PVC Heat Shrinkable Film?

 In the production of PVC heat shrinkable films, plasticizers are one of the important additives in the processing of PVC heat shrinkable materials. They can reduce the intermolecular forces of the polymer, increase the plasticity of the polymer, and improve the molding performance of PVC. The amount of plasticizer should not be too much, otherwise it will reduce the mechanical properties of the film, decrease the shrinkage stress of the film, and affect the shrinkage rate. However, due to the small amount of plasticizer added, plasticization is relatively difficult, and increasing the plasticization temperature will increase the possibility of PVC thermal decomposition.

    Therefore, an appropriate amount of ACR processing modifier can be added to the formula to improve processing performance. ACR has a solubility parameter close to that of PVC resin, resulting in good compatibility and strong adhesion between the two. ACR has a higher hardness than PVC, so under a certain stress, greater friction is generated, which makes PVC particles easier to break and melt, improves the gelation speed and melting quality of the material, and ensures high melt strength.

    Lubricants also play a crucial role in polymer processing. In the production of PVC heat shrinkable films, an appropriate amount of lubricants must be added to reduce harmful friction and lower interfacial adhesion. Based on the lubrication mechanism, the dosage ratio of internal and external lubricants should be adjusted properly to reduce compounding costs. Stearic acid and oxidized polyethylene wax have carboxyl and hydroxyl polar groups on their molecular chains, which can significantly improve compatibility with PVC and provide unique internal and external lubrication effects.

    Qihong Oxidized Polyethylene Wax OA9 is a high-temperature lubricant polymerized through high-molecular oxidation, containing a certain amount of carboxyl and hydroxyl groups in its molecules. As an excellent functional processing aid and lubricant, it exhibits stable chemical properties and good electrical performance.

For more technical questions, please consult Qihong technical engineers