Study On The Self-bonding Property Of Non-wood Plant-based Particles/Powders

Plant-based materials are composed of wood and non-wood materials. environmentally friendly binderless products were manufactured from non-wood crop residues materials in this study. Post-harvest crop residues have a high fiber content, it's a major by-product of crop. Crop residues are rich resources in nature and most of them are renewable biomass resources with multiple uses. Rational use of the crop residues is important and significance for the protect forest resources and prevent environmental pollution.Many non-wood plant-basead material have self-bonding characteristics during the hot-pressing process, so in this study we try to make variety of binderless environmentally friendly products. The study mainly composed of the following four parts.(1) we use the powder of pine bark, kenaf core, ramie core and tobacco stem instead of adhesive to make plywood products. The results show that bonding strength have been enhanced with the increase of mesh size, And in the hot-pressing temperature range of 160-180℃e the bonding strength increased with the increase of hot-pressing temperature The bonding strength of plant-basead plywood with 200 mesh size power as adhesive, hot-pressing temperature 180℃, pressure 5MPa and hot-pressing time 10 minutes, can meet the requirement of classⅢstandard of GB/T17656-1999.(2)This study analyzed the feasibility of ramie core and tobacco stem as molded products. The test had proved that method of making non-wood plant-based binderless molded products is feasibility. The results show that with the increase of mesh size, the internal bond strength,surface quality and thickness swelling properties of molded products have been improved. And in certain hot-pressing temperature range, with the increase of hot-pressing temperature the mechanical properties have been enhanced.(3) Binderless particleboards were manufactured from kenaf core without adding any additives. The effects of particle size and board density on preoperties of kenaf core binderless particleboard were investigated. The experimental results showed that with the increase of kenaf powder mesh size, the internal bond strength and thickness swelling properties of kenaf core binderless particleboard have been greatly improved. And the kenaf core binderless particleboard manufactured with particle size less than 0.45mm showed best mechanical properties. And the properties of kenaf core binderless particleboard above the density of 0.8 g/cm3 could meet the requirements of the standard of GB/T 4897.2-2003.(4)At last, change of functional groups during the hot press process was studied with the fourier transform infrared spectroscopy(FTIR) to discuss the self-bonding mechanism. And the surface features of particleboards made with different particle size were studied by Scanning electron microsecopy(SEM).