Study On Preparation And Properties Of High Strength Cellulose Flame Retardant Antibacterial Paper

In recent years,the large-scale use of petroleum based non degradable plastics has caused serious environmental pollution.Cellulosic(CF)paper has attracted widespread attention as a substitute for petroleum based non degradable plastic packaging due to its extensive source of raw materials,renewable,and degradable.Cellulosic paper itself also has problems such as poor mechanical properties,easy absorption of water,poor barrier properties,susceptibility to mold,and flammability.This topic is a detailed study and has addressed its shortcomings.The specific research content is as follows:(1)Preparation and properties of cellulose polylactic acid(CFPLA)composite paper: In this study,cellulose fibers and degradable polylactic acid(PLA)fibers were used as raw materials to prepare CFPLA composite paper using wet papermaking technology and hot rolling process.The tensile strength of CFPLA composite paper can reach 100.24 MPa,and the tensile modulus reaches 2.5 GPa,which is higher than that of conventional cellulose based paper.The water absorption of CFPLA composite paper is less than 40%,which is about 1/5 of that of conventional cellulose paper.The water contact angle of CFPLA composite paper is 106.2 °,while that of conventional cellulose paper is 0 °.In addition,the breakdown strength of CFPLA composite paper can reach48.04 k V/mm,and the degradation rate can reach 70.73% after being buried in soil for120 days.This research provides a feasible approach for the innovation of traditional cellulosic based paper packaging materials and flexible integrated circuit boards.(2)Preparation and performance study of sodium alginate polyhexamethylene biguanidine/cellulose polylactic acid(SP/CFPLA)composite antibacterial paper: Due to the lack of antibacterial properties of cellulose and PLA,there are also problems such as susceptibility to mold in humid environments.In this study,antibacterial short fibers were added to CFPLA composite paper to prepare SP/CFPLA antibacterial paper.The tensile strength of the SP/CFPLA composite antibacterial paper can reach 95.8 MPa,which is 70 MPa higher than that of ordinary cellulose paper.Compared with cellulose paper,the water vapor permeability of the SP/CFPLA composite antibacterial paper decreases by 84.2%.The antibacterial ring widths of SP/CFPLA composite antibacterial paper against Escherichia coli and Staphylococcus aureus can reach 1.5mm and 1.1 mm respectively,with good antibacterial properties.In the biodegradation experiment,the maximum degradation rate of SP/CFPLA composite antibacterial paper is only 5% after being buried in compost soil for 120 days.After 180 days,the degradation rate of SP/CFPLA composite antibacterial paper can reach 31.5%,indicating that SP/CFPLA composite antibacterial paper still has biodegradability.(3)Preparation and properties of ammonium polyphosphate polyhexamethylene biguanidine/cellulose polylactic acid(AP/CFPLA)composite antibacterial flame retardant paper: Due to the excellent combustibility of cellulose and PLA,it is easy to cause great harm when encountering open flames.This study is based on the SP/CFPLA composite antibacterial paper,using antibacterial flame retardant particles instead of antibacterial short fibers to maximize the simplification of the production process,while also possessing excellent flame retardancy.The limiting oxygen index(LOI)value of CFPLA composite paper is only 16.5%,and the LOI value of the treated AP/CFPLA composite antibacterial flame retardant paper can reach 34%.In the vertical combustion experiment,the residual flame time and residual glow time of the AP/CFPLA composite antibacterial flame retardant paper are 2.7 s and 0 s,respectively,and the loss length is only 48 mm.The flame retardant performance reaches V0 level.The antibacterial ring widths of SP/CFPLA composite antibacterial paper against Escherichia coli and Staphylococcus aureus can reach 3 mm and 1.75 mm respectively,with good antibacterial properties.