| Relative to inorganic antibacterial agents,the development of novel antibacterial agents with polylactic acid as the carrier is obviously insufficient,the research is also very weak,and the compound antibacterial agent is even less,which seriously restricts the practical application of the polylactic acid-based antibacterial materials.Therefore,antibacterial materials begin to develop in the direction of green,environmental,and healthy materials,and the development of low-cost,new-type,and highly-effective antimicrobial materials is imminent.The experiments were performed by orthogonal analysis using emulsion polymerization method using 2,3-dimethylaniline(2,3-DMA)as a monomer.sodium dodecylbenzenesulfonate as an emulsifier,and organically modified bentonite.(O-MMT)preparation of poly(2,3-dimethylaniline)(P(2,3-DMA))coated organo-modified bentonite,and adsorption of Ag+ solution,Ni2+ solution,Ag+ solution and Ni2+ solution,respectively Organic modified bentonite-poly(2,3-dimethylaniline)after adsorption of metal ions(Ag+/O-MMT-P(2,3-DMA),Nit+/O-MMT-P(2,3-DMA)and Ag+/Ni2+/O-MMT-P(2,3-DMA)antimicrobial microspheres.The optimal optimization process for preparation of antibacterial microspheres was obtained by orthogonal experiments:the amount of each component was based on 1 mol of 2,3-dimethylaniline monomer,and the amount of emulsifier:monomer = 1:1;pH = 2.5;reaction time 12h.The structure of the antimicrobial microspheres was characterized by FT-IR,XRD,scanning electron microscopy,transmission electron microscopy and thermo gravimetry.The results showed that 2,3-dimethylaniline successfully polymerized into poly(2,3-Dimethylaniline)was coated with organically modified bentonite,but the chemical reaction did not change the structure of the organically modified bentonite.The atomic absorption spectrophotometer was used to measure the adsorbed metal ion solution.The results showed that the adsorption capacity of O-MMT-P(2,3-DMA)for Ag+ can reach 7.99mg/g,and the adsorption capacity for Ni2+ can reach 30.835mg/g..The antimicrobial microspheres made of polylactic acid(PLA)were used as functional fillers to prepare PLA-supported Ag+/O-MMT-P(2,3-DMA)fiber filament products by electrospinning.PLA fiber products containing Ni2+/O-MMT-P(2,3-DMA)materials and PLA-supported Ag+/Ni2+/O-MMT-P(2,3-DMA)materials.The effect of spinning process such as polylactic acid addition amount,spinning voltage,spinning distance and spinning flow rate on the filament formation of polylactic acid(PLA)fiber was investigated.The results showed that when the mass fraction of polylactic acid was determined to be 10%,the voltage was 18 kV;the distance was 17 cm,the flow rate was 1.0 mL/h,and the functional filler was 0.5%,the fibers prepared had a better morphological structure.Next,antibacterial tests were performed on the fibers prepared from PLA-loaded antimicrobial microspheres.The antimicrobial activity of E.coli and Staphylococcus aureus were examined.The results showed that the antibacterial properties of the three antimicrobial agents were ranked:The inhibition rate of MMT-P(2,3-DMA)fiber to Escherichia coli and Staphylococcus aureus reached 92.9%and 92.2%,and the antibacterial rate was the highest.PLA loading Ag+/O-MMT-P(2,3-DMA)The antibacterial rate of the fiber products of materials against Escherichia coli and Staphylococcus aureus reached 77.7%and 73.7%,respectively. |
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