Preparation And Characterization Of Ramie Bone-Based High Density Composite Wood

In order to seek a new way to clean and utilize the high value of ramie bone,the high-performance ramie bone-based composite wood was prepared,the ramie bone-based composite wood was designed and constructed,and the ramie bone-based high-density composite wood was prepared by alkali treatment of ramie bone fiber and powder as the substrate,and its preparation process and toughening factor were optimized;its weather resistance was assessed by means of Fourier infrared spectroscopy,thermohamaging analysis method,scanning electron microscopy and other means to assess its weather resistance and explore its toughness mechanism.(1)Based on the optimal model of ramie bone-based high-density composite wood "ramie bone powder-ramie bone fiber-ramie bone powder",the optimal process of ramie bone high-density composite wood forming and the main toughness factor combination were obtained by applying the response surface method:temperature 150℃,temperature pressure of 70MPa,insulation Temperature and pressure time of 20min,chitosan addition of 10%;under the conditions of optimal forming process and optimal chitosan addition,the density and static curvature strength of ramie bone-based high-density composite wood were obtained by the optimal forming process and the optimal chitosan addition,respectively,the density and static curvature strength of ramie bone-based high-density composite wood reached 1.27g/cm3,79.51 MPa,its water absorption rate is only 2.97%.(2)With the help of infrared spectrometer,the infrared spectral characteristics of ramie bone-based composite wood specimens were compared and analyzed,and it was found that the higher the temperature of the specimen,the easier it was for the specimen material to produce unsaturated bonds,and the formation of unsaturated bonds promoted the combination between ramie bone fibers and ramie bone powder particles;the addition of chitosan further promoted the combination between ramie bone fibers and ramie bone powder particles,so that ramie bone-based high-density composite wood was strengthened.(3)By strengthening the addition of chitosan,the weather resistance of ramie bone-based high-density composite wood is enhanced,and its application environment is extended from indoor to outdoor.(4)Microscopic morphology observation and analysis of ramie bone-based high-density composite wood was observed and analyzed by scanning electron microscopy,and it was found that the addition of chitosan promoted the compaction between ramie bone fibers and their powder particles and the adhesion behavior of lignin,and effectively improved the density and static curve strength of ramie bone-based composite wood.(5)Through thermogravimetric analysis,it was found that the addition of chitosan can effectively delay the pyrolysis of cellulose and hemicellulose in ramie bone substrate,thereby enhancing the thermal stability of ramie bone-based high-density composite wood;through the addition of chitosan before and after the specimen bacteriostaticity,it was found that ramie bone itself has certain bacteriostatic properties,and the addition of chitosan is conducive to enhancing the bacteriostaticity of the specimen;through the acid and alkali salt resistance test,it is found that the acid resistance of the high-density composite wood specimen with chitosan added is better than that of the specimen without chitosan.