The Preparation And Application Of Blocking Anticorrosive LDPE Film

With the low density polyethylene (LDPE) as the matrix, nano flake copper as filler, a blocking anticorrosive film was prepared via melt-blend and film blowing technique. FTIR, XRD, SEM, TG, salt spray test, blocking test and mechanical performance test were employed to characterize the resultant nanocomposites films. On the one hand, the relevant amount of nano copper powder can be evenly dispersed in the matrix, the resultant "multi-path effect (nano wall effect)" and the improvement of the crystallinity made the barrier performance of nanocomposite films been highly enhanced. On the other hand, the corrosive medium can be consumed by the reaction with the nano flake copper which has a highly reactivity. The comprehensive function of two aspects made the anti-corrosion performance of LDPE film been improved. In addition, the mechanical properties and thermal stability of the nanocomposites were also influenced. With the increase of the amount of nano flake copper, heat resistance and mechanical properties show the tendency of first increases and then reduces. Comprehensive performance of the composite film would be optimal, when the addition amount of nano flake copper was 5wt%.Antistatic blocking anticorrosive films were prepared by using glycerol monostearate/polyethylene oxide, nonylphenol polyoxyethylene (10) phosphate potassium and superconducting electrical carbon black as the antistatic modifier. In consideration of the conductive performance and appearance of the modified films, the superconductive carbon black was finally chosen as the antistatic modifier for block anticorrosive film. FTIR, XRD, SEM, TG, salt spray, test blocking test and mechanical performance test were employed to characterize the resultant nanocomposites films. The results show that, firstly, the modified films appeared obvious conductive percolation phenomena. The conductive percolation threshold of this carbon black is 2.6wt%, when the amount of carbon black beyond 2wt%, the modified films meet the requirements of electrostatic disappeared film. Secondly, the introduction of an appropriate dose of superconductive carbon black has no impact on the blocking performance and the anti-corrosion performance of the modified fims. The anticorrosive mechanism aslo has not been changed. Finally, the introduction of superconductive carbon black into matrix has aslo influenced the mechanical and heat resistance properties of the modified films, showing the tendency of first increases and then reduces.