| In the nature, second to cellulose, lignin is the largest renewable resource. Theapplication of lignin in industry and agriculture is restricted due to the complicatedstructure of itself. And the lignin mainly exists in the industry waste water andagriculture castoff, utilizing inefficiently. After the modification, the molecular weight,water-solubility and surface activity of lignin increased. The modified lignin could beused in the aspects of water reducing agent, oil recovery, dyestuff dispersant,controlled release fertilizer, composite wood, reducing surface runoff, sand-fixationand water retention and so on. The modification made the application field of ligninbroadened and increased its economic value. The synthesis and application ofdustproof and waterproof biomass-based environmental film were studied in the paper.Firstly, the raw material was modified to prepare the environmental film. And theeffect on properties of factors was examined. The results showed that the optimumconditions were as follows: reaction temperature,85℃; glutaraldehyde(to PVA glue),32.32wt%; dimethyl phthalate(to PVA glue),32.32wt%； for casting solution,lignosulfonate,22.22wt%; formaldehyde,31.75wt%; urea,22.22wt%; borax,1.59wt%;PVA,22.22wt%. Under these conditions, the tensile strength could reach2.2KN/m,and the water absorption rate was35.2%.Secondly, the properties of the film were tested. Compared with the plastic filmon sale, the results showed that its dry, wet tensile strength were up to2.2KN/m and1.4KN/m, the tearing strength was2.6N, and the bursting strength was97.5kPa.Finally, the application of the film was studied. The results showed that the product sprayed at120～145kg/hm2with20～25time water. However, the product, at70Kg/hm2, was the best for reducing water surface evaporation. The significant pointwas that its degradation rate was up to75%when it had been buried in the soil for56days, the results showed that the environmental film was biodegradable. |
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