Preparation And Bactericidal Property Of The Polyurethane Prepolymer Containing Hydroxyl Terminated Cationic Polyether

Polyurethane materials are widely used in the seat, indoor sound insulation, fabric, refrigeration, industrial industry, transportation and so on which are closely related to people’s life. However, due to the products made of polyurethane materials are susceptible to be influenced by the temperature and humidity in the process of usage and storage.What’s worse, they are prone to grow and reproduce the bacteria under this condition. Thus the research and development of the polyurethane material with antibacterial function has become a hot spot. At present the main method is to add the inorganic or organic small molecule antibacterial agent to the polyurethane surface by physical blending or coating to make the polyurethane antibacterial materials. Nevertheless, this kind of material is easy to fall off, permeates into the human body and causes the secondary environmental pollution. Based on the above shortcomings,the thesis first designed synthetic PECH with terminal hydroxyl and made end hydroxyl cationic polyether(polyurethane antibacterial material of Pre polymer) by grafting the groups with antibacterial and fungal activity onto the PECH, which laid the foundation for the preparation of polyurethane antibacterial materials.Materials prepared by this method can not only ensure not affect the physical properties of the polyurethane itself but also they can overcome the shortcomings of the antibacterial materials prepared by physical blending method, and the polyurethane materials have better antibacterial activity. The concrete research content includes:(1) The PECH was prepared by using cationic ring-opening polymerization method and characterized;(2) Compounds containing tertiary amine(or tertiary phosphine) were chosen to graft onto PECH, and their structure was characterized and grafting conditions were optimized;(3) The methods of inhibition zone and the plate colony counting were applied to test the antibacterial property of the polyurethane prepolymer containing hydroxyl terminated cationic polyether, which was prepared above. In addition, this paper also proposed and explored a further expansion of the synthesis of the precursor, using two methods to prepare different forms of cationic polyether polyurethane antibacterial material.1. This paper used epichlorohydrin(ECH) as the monomer, in the presence of catalyst by cationic ring-opening polymerization, synthesis of PECH. FTIR, NMR, GPC and potentiometric titration were used to characterize the structure and determination of hydroxyl value. The results showed that the preparation of the products conformed to our expectations. On this basis, the synthesis process was further studied, and the optimal conditions for the synthesis of PECH were also explored.2. The small molecular amine compounds(or tertiary phosphine), triethylamine(TEA) and dodecyl amine(DMA12), triphenyl phosphine(TPP) were selected and grafted on the PECH. Hydroxyl terminated cationic polyethers with antibacterial activity were prepared, in which the novel cationic polyether prepared by DMA12 and TPP grafting in the PECH were not reported in the reference. Their structure was characterized with FTIR and HNMR. Determine the optimum reaction conditions by investigating the influence rules of various factors to the reaction. The results of the study showed that the quaternization reaction was easy to carry and the grafting reaction was influenced by the kind of tertiary amine(phosphine) reagent, the property of solvent, the temperature and time of reaction and the reactant ratio. For TEA, DMA12, TPP, when using acetone as solvent, its quaternary ammonium(phosphonium) content could be up to a maximum of 45.2%, 25.8%, 19% respectively when the reaction temperature were controlled 60℃, 110℃ and 110℃, the reaction time were 10 h, 14 h, 14 h, material ratio(n PECH: ntertiary amine(phosphine) reagent were 1:2.5, 1.3.0, 1:3.0.3. Three kinds of common pathogenic bacteria including the S. aureus, E.coli and B.subtilis which were harmful to human health were used to complete the antibacterial activity. The sterilization results were displayed by the method of inhibition zone and dilution plate counting method: these three kinds of product have a certain antibacterial effect on the three kinds of bacteria, with PECH-QPC antibacterial effect the best, PECH-QAC2 the second place, and PECH-QAC1 the weekest.