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《Environmental Science & Technology》 2012-12
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Preparation of Starch Modified Ecological Sand-fixing Agent

DU Feng1,2,FANG Xian-li1,2,XIANG Shang-lin1,2(1.Jiangsu Ruifeng Science and Technology Industrial Co.Ltd; 2.College of Materials Science and Engineering,Nanjing University of Technology,Nanjing 210009,China)  
Waterborne polyurethane sand-fixing agent with different contents of soluble starch were prepared via the prepolymer method using toluene diisocyanate(TDI),polyoxypropylene glycol(PPG)as base materials and dimethylol propionic acid(DMPA)as hydrophilic monomer,trimethylolpropane as chain-extending reagent respectively.Influence of soluble starch on the performance of polyurethane emulsion and corresponding resulted sheets was investigated.Results showed that stable emulsions were successfully prepared as soluble starch was added during chain-extending phase.Viscosity and average particle size of the emulsion were increased with increasing dosage of soluble starch,while tensile strength was reduced with increasing dosage of soluble starch.Energy storage modulus was found to decrease with increasing concentration of soluble starch via dynamic mechanical analysis while glass transition temperature was increased.Addition of starch helped to enhance the ability of water conservation.When the weight ratio of soluble starch to polyurethane was about 10%,tensile strength and elongation at break of the corresponding sheet were 16.7 MPa and 662% respectively.Water conservation result showed water loss was only 55.7% when emulsion was used as sand-fixing agent which indicated the balance of mechanical properties and water conservation can be acquired at this composition.
【Fund】: 江苏省财政厅 江苏省科技厅2011年度第一批省级科技创新与成果转化(重大科技支撑与自主创新)专项引导资金项目(BF2011003)
【CateGory Index】: TQ072
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