松香/淀粉基可生物降解热熔胶的制备及性能研究

Research on Preparation and Performance of Rosin/Starch Based Biodegradable Hot Melt Adhesive

利用复合增塑剂(甘油、乙二醇按比例组成)对天然糯米淀粉进行改性,并在高剪切作用下制得热塑性糯米淀粉基料(TPS);以松香为原料,以甘油作改性剂对松香进行酯化改性,得到松香甘油酯作增粘树脂,将制得热塑性糯米淀粉基料与松香甘油酯在一定温度下熔炼共混,并配以合适的助剂,制得松香/淀粉基可生物降解热熔胶。当松香树脂与热塑性糯米淀粉的质量配比为45/55时,所制备的热熔胶新品熔融粘度为5.1Pa·s,软化点为92℃,抗拉强度为4.5MPa,断裂伸长率为215%,月降解率为26.8%,且热稳定性较好。

The composite plasticizer（composition of glycerol and ethylene glycol according to their proportion） was applied in the modification of natural waxy rice starch,and the high shear conditions to prepare thermoplastic waxy rice starch（TPS）.Rosin,as the raw material,with glycerol as the modification agent,by esterification modification,produced the rosin glyceride which was roling as the tackifying rosin,melting blended with the prepared thermoplastic waxy rice starch base on a certain temperature,with the appropriate auxiliary agent,prepared the rosin/starch based biodegradable hot melt adhesive.When the mass ratio of rosin and thermoplastic waxy rice starch was 45/55,the melt viscosity of the prepared hot melt adhesive products was 5.1 Pa·s,the softening point was 92 ℃,the tensile strength was4.5 MPa,the elongation at break was 215%,the monthly degradation rate was 26.8%.With good thermal stability,the products could meet the technical standards requirements of the hot melt adhesive of common market.