Study on the Preparation of Non-Adhesive Corn Straw Sheets under High Temperature and High Pressure
We employed a purely physical method in this research to prepare adhesive-free corn stalk boards by crushing and sieving the corn stalks as a pretreatment,followed by high-temperature and high-pressure molding under conditions of temperature ranging from 20℃ to 150℃,pressure ranging from 10 MPa to 90 MPa,and a dwell time of 2 hours.The density of the boards ranged from 0.67 g/cm3 to 1.29 g/cm3,meeting the standards for high-density boards.Mechanical properties characterization was conducted using a universal testing machine,re-vealing that the bending strength of the adhesive-free corn stalk boards ranged from 0.20 MPa to 30.1 MPa,while the tensile strength ranged from 0.21 MPa to 21.7 MPa.This indicates that applying pressure can shorten the dis-tance between corn stalk fiber and promote the formation of hydrogen bond grid between lignin and other fibers,while regulating cellulose to increase the strength of hydrogen bond grid,and meanwhile,temperature helps solidi-fy hemicellulose to generate more thermosetting resin,thereby enhancing the internal bonding of adhesive-free corn stalk board.
high temperature and high pressuremechanical propertycorn strawnon-adhesive
万方数据
维普
