Study On Processes Of Binderless Fiberboard From Steam-Exploded Cotton Stalk And Its Bonding Mechanism

The object of the research is to achieve breakthrough development in the production of binderless fiberboard from steam-exploded cotton stalk,experimented repeatedly and optimized pressing conditions,based on the previous self-bonding theory. The key is to improve the performances of self-bonding board and explore the bonding mechanism of binderless fiberboard.In the exploding experiment, the cotton stalk fiber can be separated after being exploded, the higher of exploding pressure, the better of separated degree; cellulose and hemicellulose hydrolyzed partly, its hydrolyzable degree heighten with exploding pressure increased. Good performance binderless fiberboards can be produced, especially the waterproof ability. With increasing of the exploding pressure, the fiberboard's IB increased, MOR and MOE decreased.According to the explosive experiment, the orthogonal test, and single factor experiment, the optimized processing parameters of binderless fiberboard from steam-exploded cotton stalk in laboratory were obtained: to produce 4mm board with density of 0.85g/cm~3 under such conditions: moisture content(MC) 10%～15%, hot-pressing temperature200℃～210℃, pressure 4.5MPa and hot-pressing time about 90 s/mm. Except the modulus of rupture (MOR), The other properties of products can meet the standard of MDF(GB/T 11718-1999).By Scanning Electron Microscope(SEM), X-ray Diffraction(XRD), Fourier Transform Infrared Spectroscopy(FTIR), High performance Liquid Chromatography(HPLC) and chemical analyses, the changes of the structure, the main components, the functional groups and the crystal degree of cellulose during the processing were investigated. The probable bonding mechanism of the binderless fiberboard are:1. Hydrogen bond theory2. Furfural's resinification3. Polymerization between furfural and lignin4. New LCC's synthesization...