Applied Basic Research On Low Density Porous Biomass Material

The research was supported by the project of the Key TechnologyR&D Progra m of China. The project is the key technology of processingand application of konjac glucomannan (KGM) in large scale（NO.2007BAE42B04). The molding container with some annual ryegrassseed was inverted repeatedly. In this process the stems and roots wouldgrow in the opposite direction when the culture dishes were invertedaccording to the tropism growth movement of plant. After repeatedlyinverted several times, the stems and roots would twine closelytogether in the culture dishes. Then dry the material in the oven, we canget the low density porous biomass material. Not only the effect ofaddition of seed and rice husk on the mechanical properties of the lowdensity porous biomass material was studied, but also the mechanicalproperties of the material strengthened by hypha of Pleuvotus dia morwas studied. The results were concluded as follows:(1)25℃was the optimum growth temperature, and under thiscondition the germination percentage and germination potential ofannual ryegrass, tall fescue, and trefoil were respectively93.67%,91.67%,84.33%and83.00%,81.67%,80.67%.(2) The effect of paclobutrazol, chlormequat chloride,6-benzylaminopurine and gibberellic acid on the growth of annual ryegrass, tallfescue, trefoil was studied. The results showed that application of1000times dilution6-benzyl a minopurine allows the grass to grow better.The height of annual ryegrass on the fifth and10th day were7.1c mand10.2cm, i ncreased by29.1%and29.1%than the blank controller. Itproved that the annual ryegrass seed soaked by1000times dilution6-benzyl aminopurine was the best to prepare the low density porousbiomass material.(3) The low density porous biomass material with different densityand mechanical property were prepared by changing the addition of theannual ryegrass seed in the molding container from5g to25g. The density of porous biomass material with20g seed in the moldingcontainer was0.0564g/c m3, and the compressive stress wererespectively4.928KPa,9.664KPa,14.848KPa,23.168KPa and40.32KPa when the compressive strain were respectively10%,20%,30%,40%and50%.(4) The density of low density porous biomass material prepared by10g annual ryegrass seed and4g rice husk was0.0451g/cm3. And thecompressive stress were respectively46.336KPa,96.704KPa,155.84KPa,263.42KPa and503.04KPa when the co mpressive strainwere respectively10%,20%,30%,40%and50%. It indicated that theporous biomass material have better mechanical properties.(5) The density of low density porous biomass material prepared by20g annual ryegrass seed after strengthening by hypha of Pleuvotusdiamor was0.0682g/cm3. And the compressive stress were respectively55.12KPa,100.23KPa,140.19KPa,190.57KPa and260.34KPa when thecompressive strain were respectively10%,20%,30%,40%and50%,increased by877.30%,805.52%,722.23%,617.51%and462.53%.Compared with low density polystyrene foamed plastic, thecompressive stress was increased by14.33%,53.54%,81.95%,100.35%and122.49%.After the research of the basic application characteristics of thelow density porous biomass material, it suggested that this kind ofmaterial was a kind of fully biodegradable environmentally friendlymaterial with light qualitative and excellent mechanical property. Itcould solve the problem of white pollution that caused by traditionalplastic foam, and it also have great potential to be widely used inconstruction, transportation, packaging, home decor and commoditymarket.