The importance of health in today's world has led scientists and even manufacturers to optimally utilize all sorts of resources and provide a field for increasing the level of community health. Special attention is paid to promoting water hygiene as one of the main daily needs of humans. Due to the reduction of water resources and the need for water storage hygienically, the use of water storage tanks seems obvious . Nowadays, the tendency to use polymers instead of metals in the production of tanks due to their special properties, better processability and low weight of manufactured products h as been increased. However, the use of polymer for manufacturing tanks has not been able to remove all the weaknesses of metal tanks. Algae growth in tanks is one of those weaknesses. Attempts have been made to remove some of the disadvantages of the polymers, in which the most important is to add other materials to the polymer. One of the best additives to polymer is the addition of nanoparticles. In this study, by adding zinc oxide nanoparticles in 1%, 5% and 12% by weight to high density polyethylene, polyethylene zinc oxide nanocomposites were produced by two methods , namely Melt Rolling Mixing and Injection Molding. To evaluate the mechanical properties of the tensile, flexural and impact tests, and for its structural evaluation, Differential Scanning Calorimetry, X-ray Diffraction, Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy were performed on the prepared nanocomposites and pure polymer. Algae growth test was also executed on the samples. The results indicate that by comparing the percentage increase in the properties between pure polyethylene and nanocomposite with different percentages, nanocomposite containing 1% by weight of zinc oxid nanoparticles due to its significant effect on preventing algae growth while maintaining the mechanical and physical properties of pure polyethylene is optimal. Keywords : Nanocomposite, Polyethylene, Zinc Nanoxide, Anti Algae, Mechanical Properties, Structural Investigation, Injection Molding , Roller Melt Mixer
