| Cationic acrylate copolymer emulsion characterized by the positive charge of the emulsion by the addition of a cationic emulsifier and thus a good balance of the negative charge,which in many respects has an unparalleled function of anionic or nonionic emulsions,(PHGH)has excellent antibacterial properties,but because of its low molecular weight,easy to use in the process of easy to use,but also because of its high molecular weight,Loss caused by antibacterial effect is not lasting,thus limiting the development in the field of antibacterial applications.In order to extend the application of polyhexamethylene guanidine hydrochloride,polyhexamethylene guanidine salt was successfully introduced into the macromolecule polymer by pre-emulsified semi-continuous core-shell emulsion polymerization method.Gram-positive bacteria have excellent antibacterial properties of polyacrylate emulsion.In this paper,maleic anhydride(MA)was bonded to PHGH to obtain functional cationic antimicrobial monomer M-PHGH with unsaturated double bond.The conditions of emulsion polymerization were studied by single factor method,including initiator concentration,reaction monomer molar Ratio,reaction temperature,etc.on the properties of the emulsion.The optimum conditions were as follows:monomer molar ratio BA:MBA:M-PHGH = 25:20:1,the initiator content was 0.8 wt%,the reaction temperature was 70 ?,the particle size was uniform and stable Good antibacterial emulsion.The composition,morphology and microstructure of the polymer emulsion emulsion were characterized by multi-angle particle size and Zeta potential analyzer,infrared spectroscopy(FT-IR)and scanning electron microscopy(SEM).FT-IR indicated that the functional cationic antimicrobial monomer M-PHGH was involved in the polymerization reaction with monomer BA and BMA,and the guanidine group was successfully introduced into the polymer antibacterial agent.From the SEM and particle size analysis,the latex of the polyacrylate emulsion Particle shape is more regular,round shape,particle size is relatively uniform,particle size distribution showed good monodisperse.The average particle size of emulsion latex particles is 109.90 nm and the particle size distribution index PDI is 0.106.In this paper,Escherichia coli,Staphylococcus aureus and Candida albicans were used to test the bacteria,and the antibacterial properties of the antibacterial agent polyacrylate emulsion were studied and the antibacterial mechanism was explored.The minimum inhibitory concentrations of polyacrylate latex for Escherichia coli,Staphylococcus aureus and Candida albicans were 16 ppm,8 ppm,and 64 ppm,respectively,using a double dilution method.Indicating that the polymer antibacterial agent on the Gram-positive bacteria,Gram-negative bacteria have a good antibacterial effect.SEM showed that the bacterial or fungal morphology after antibacterial emulsion was changed to varying degrees,cell integrity was destroyed and the cell contents were dissolution.The cationic polyacrylate emulsion was used to modify the cellulose bagasse cellulose by electrostatic adsorption,and the antibacterial properties of the modified cellulose were tested by oscillating shake flask method.The results showed that cationic guanidyl polyacrylate emulsion antibacterial agent could give good antibacterial effect of bagasse cellulose,and when the dosage was 1.0%and above,the antibacterial rate of Escherichia coli could reach more than 90%.At the same time,the effects of different temperature,different concentration and time on the antibacterial properties of the modified bagasse cellulose were investigated.The results showed that the antibacterial bagasse cellulose had a good inhibitory effect on Escherichia coli,Staphylococcus aureus and Candida albicans effect. |
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