聚酯废弃物改性植物油沥青粘结剂的红外研究

FTIR Research on the Modification of Plant Oil Pitch Binders by Polyester Waste

采用蒸馏厂的下脚料———各种植物油沥青(棉油沥青、豆油沥青、混合油沥青)为主要原料,用聚酯废弃物为改性剂,经裂解、酯化等工艺制备成三种铸造用植物油沥青粘结剂(MB)。同时采用红外光谱和热重分析等手段对该三种粘结剂的基团结构,性能与固化机理进行探索,并与合脂粘结剂比较。结果表明:改性粘结剂的主要成分与合脂粘结剂大致相同,且具有更高的干拉强度、更慢的发气速度等优异性能,达到甚至超过合脂粘结剂的性能,可用于Ⅰ级型芯砂的粘结,而且成本低廉。

Various plant oil pitchs （cottonseed pitch, bean oil pitch, and mixed plant oil pitch） were used to prepare the plant oil pitch binders for casting. They were treated by polyester waste and processed by several technics such as esterifying. Ⅰn the mean time, FTⅠR and TG were adopted to learn the structure, property, and sclerous mechanism of the binders. From the comparison with synthetic fat binder, the authors can see that the treated binders have similar components. They also have many excellent properties such as higher dry tensile strength and slower deflation velocity, which equal to or even exceed the properties of synthetic fat binder. Therefore, the treated binders, which were cheaper, can be used to make class Ⅰ mold and core binders.