PVC Film

What role does oxidized polyethylene wax play in PVC heat shrinkable films?

    In the production of PVC heat shrinkable films, plasticizers are one of the important additives in PVC heat shrinkable material processing. They reduce the intermolecular forces of the polymer, increase polymer plasticity, and improve the molding performance of PVC. However, excessive plasticizer dosage will reduce the mechanical properties of the film, decrease shrinkage stress, and affect shrinkage rate. With limited plasticizer addition, plasticization becomes challenging, while increasing plasticization temperature raises the risk of PVC thermal decomposition.

    To address this, adding an appropriate amount of ACR processing modifier to the formula can improve processability. ACR has a solubility parameter close to PVC resin, ensuring good compatibility and strong adhesion. Due to its higher hardness than PVC, ACR generates greater friction under stress, promoting PVC particle fragmentation and melting, increasing gelation speed, improving melt quality, and enhancing melt strength.

    Lubricants also play a critical role in polymer processing. In PVC heat shrinkable film production, adding suitable lubricants reduces harmful friction and interfacial adhesion. By adjusting the ratio of internal and external lubricants based on their mechanisms, compounding costs can be minimized. Stearic acid and oxidized polyethylene wax, with carboxyl and hydroxyl polar groups in their molecular chains, significantly improve compatibility with PVC and provide unique internal and external lubrication effects.

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