Abstract: The surface of plastic contacting with drinking water is prone to breeding bacteria and other microorganisms, which will lead to excessive microorganisms in drinking water and pose a huge threat to the safety of drinking water and human health. The effects of glass loaded silver, polyhexamethylene guanidine hydrochloride (PHMG), polypropylene grafted polyhexamethylene guanidine hydrochloride (PP-g-PHMG) on physical and processing properties, safety performances of contacting with drinking water, antibacterial and long-term antibacterial properties of PP plastics were studied. The results reveal that the PP material modified with PP-g-PHMG shows excellent physical and processing properties, as well as the safety performances of contacting with drinking water. Moreover, the initial antibacterial rate is greater than 99.99%, and after 81 days of continuous boiling at 80℃, the antibacterial rate is greater than 99.9%, demonstrating the excellent antibacterial and long-term antibacterial properties. Compared with glass loaded silver and PHMG, the advantages of PP-g-PHMG are obvious in health safety and long-term antibacterial properties, which has great prospects for application in antibacterial PP plastic contacting with drinking water.

Key words: Drinking water, Health and safety, Antibacterial properties, Long-term antibacterial properties