The Influence Of Layers Self-assembly’s On Antibacterial Paper Preparation, Structure And Properties

With the rapid economic development and improvement of living standards,people have higher daily requirements, paper product is necessary in our daily lifeand antimicrobial paper product, In order to prevent the spread of harmful bacteriaand infection of infectious disease, Study on antibacterial life and industry of paperis great significance. However, it is only on initial stage for research onantimicrobial paper product, neverthless the one with synergistic antimicrobial andstrength enhancing effects which is important for most paper grades.This paperfocused on investigating an antimicrobial agent suitable for papermaking industry,mainly including synthesis and characterization of antimicrobial agents,self-assembly of polyelectrolyte, synergistic antimicrobial and strength enhancingeffects.Chitosan biguanidine hydrochloride (CGH) which has more cationic wassynthesized by chitosan with the dicyandiamide as modifier, studied the reactiontemperature, time, concentration of hydrochloric acid, molar ratio of modifiedchitosan on charge quantity and yields of CGH. The optimum reaction conditions:Reaction temperature90℃, reaction time2h, concentration of hydrochloric acid0.4mol/L, chitosan and dicyandiamide molar ratio of1:3.Through the methods inthis paper, antimicrobial agents of CGH was synthesized successfully with designedcharacterized by FT-IR and XRD.In this paper, the effect of pH on environment, Self-assembly processesbetween cationic CGH polymer and sodium carboxymethyl cellulose CMC on thesurface of the fiber, on the charge properties of slurry, paper physical strengthproperties and self-assembly of fibre surface properties, the self-assembly ofadsorption mechanism were analyzed. The results showed that: the CGH/CMCself-assembly caused the Zeta potential positive and negative charge reversal, and improve Pulp Filtration. With the increasing of self-assembled layers, the strength ofpaper showed a wave-like rise, and strength performance depends on the outermostlayer of polyelectrolyte, when the outermost layer of CMC can get higher drystrength properties, the outermost layer of CGH can obtain good wet strength. InpH=7.5fiber environment, the paper tensile index, folding strength, tear index andburst index were improved by84.29%,650%,67.20%and62.56%with theself-assembled layer on8, When the self assembled layer was7, the paper wettensile index and wet strength retention rates increased by635.08%and376.22%.Through the surface properties of fiber samples were characterized by SEMtechniques, the surface of treated fibers became smooth. Finally, through FT-IR andAFM characterization, The C=NH2+of the CGH was reacted with COO-in CMC,generated polyelectrolyte complexes, these polyelectrolyte surface has a lot ofparticulate composite particles, which caused the rugged topography.CGH was determined by minimum inhibitory concentration (MIC), Escherichiacoli and Staphylococcus aureus were used in the test. It was showed that the MICof CTS were1.0mg/mL on Escherichia coli and Staphylococcus aureus,and theMIC of CGH were0.5mg/mL and0.25mg/mL on Escherichia coli andStaphylococcus aureus respectively. CGH antibacterial effect was superior to theCTS. The handsheets which treated by self-assembly in5layers on Escherichiacoli antibacterial efficiency could be above90%in three different environment,continue to increased the self-assembled layers, the handsheets did not greatlyenhance the antibacterial efficiency; and the handsheets which treated byself-assembly in2layers on Staphylococcus aureus antibacterial efficiency couldbe above90%, With the increasing of the self-assembled layers, the paperantibacterial efficiency closed to100%. This result showed that CGH/CMC selfassembled of the paper which has good antibacterial effect on Staphylococcusaureus.