The Application Of Antibacterial Agents On Plastics

The antibacterial properties of antibacterial plastics should have the characteristics of high efficiency, broad-spectrum, sustainability, and be non-toxic, odorless, and have no impact on the environment. Antibacterial agents should also have good compatibility with various plastics, not react chemically with various additives in plastics, and not change color due to light and heat. The processing method of antibacterial plastics generally involves mixing antibacterial powder or antibacterial masterbatch with resin, and making various products under processing and molding conditions. Foreign countries are more active in the development and application of antibacterial plastics. Countries such as the United States, Japan, and the United Kingdom have extensively used antibacterial PP, PE, PVC, ABS, PS, etc. to produce refrigerators, washing machines, water dispensers, dishwashers, sanitary ware, water pipes, toys, computer keyboards, various remote controls, food utensils, and medical hygiene materials. 70% to 80% of washing buckets in Japanese washing machines are made of antibacterial PP. In 1998, Haier Group in China successfully developed and launched air conditioners, washing machines, refrigerators, telephones, etc. with antibacterial properties. The antibacterial agents used were composite inorganic antibacterial agents. Polypropylene pipes have been widely used, but there is a fatal flaw that pipes are prone to the growth of fungi. Due to polypropylene being an organic polymer material that is easily corroded by microorganisms, a layer of slippery substance will form on the surface after a period of use; In fact, it is the growth of fungi, and once the pipeline is installed, it is difficult to clean. Zheng Ana and others from East China University of Science and Technology used molecular assembly antibacterial technology to assemble selected organic antibacterial functional groups onto the molecular chains of polypropylene matrix resin, obtaining antibacterial masterbatches; Due to the fact that the antibacterial functional groups are chemically bonded to the resin, it overcomes the shortcomings of ordinary organic antibacterial agents such as heat resistance, poor compatibility with PP matrix, and resistance to soaking and washing. Research has found that antibacterial masterbatch can act as a nucleating agent in the system, increase the crystallization temperature, accelerate the crystallization rate of the material, and to some extent improve the mechanical properties of the material; When the assembly amount of antibacterial functional groups is above 0.5%, the material has excellent antibacterial effect, strong inhibitory effect on Gram negative and positive bacteria, as well as fungi and molds, and excellent durability. Its antibacterial performance is better than imported inorganic silver antibacterial masterbatch, and it has excellent use safety. Inorganic antibacterial agents are in powder form with particle sizes as small as a few micrometers. In recent years, with the widespread research on nanotechnology, nanoscale antibacterial agents have gradually been put into production. Nano multifunctional plastic not only has antibacterial function, but also has anti-aging, toughening and strengthening effects. Nanoscale antibacterial agents are made by encapsulating antibacterial substances on the basis of nanoscale powders