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以废弃瓦楞纸板纤维和低密度聚乙烯(LDPE)为基体辅以相应的相容剂、润滑剂和发泡剂,利用挤出发泡法制备了发泡废纸板纤维/LDPE木塑复合材料。通过熔融指数仪研究了废纸板纤维含量、相容剂马来酸酐接枝聚乙烯(MAH-g-PE)的用量、润滑剂的种类与用量以及发泡剂偶氮二甲酰胺(AC)的用量对该复合材料加工流变特性的影响;并利用SEM观察不同熔融指数的复合材料对泡孔形态的影响。结果表明:随着废纸板纤维含量的增加,复合材料的熔融指数(MFI)迅速下降;MAH-g-PE增加了纤维填料与树脂基体之间的相互作用,复合材料的熔融指数随着相容剂用量的增加先降低后升高,其含量的转变点为15%;PE蜡对复合材料的综合润滑作用最明显,复合材料的熔融指数随着PE蜡的含量呈近线性变化;AC发泡剂的加入降低了复合材料的熔融指数,AC发泡剂的含量超过5%将使复合材料产生明显的壁滑移;随着熔融指数的增加,复合发泡材料的泡孔逐渐变大,当熔融指数为1.5时,泡孔大小适中且分布均匀。
Using waste fiberboard and low density polyethylene (LDPE) as matrix, the compatibilizers, lubricants and foaming agents were co-extruded. The foamed waste paperboard fiber / LDPE wood-plastic composites . The fiber content of waste paperboard, the amount of MAH-g-PE as compatibilizer, the type and amount of lubricant and the foaming agent azodicarbonamide (AC) The amount of the composite material rheological properties of the impact; and SEM observation of different melt index composite material on cell morphology. The results showed that the MFI decreased rapidly with the increase of the fiber content in the waste paperboard. The interaction between the fiber filler and the resin matrix increased with the addition of MAH-g-PE. The melt index The content of compatibilizer changed 15% at first, then increased with the increase of content of compatibilizer. The comprehensive lubrication of PE composite was the most obvious. The melt index of the composites changed linearly with the content of PE wax. The addition of foaming agent decreased the melt index of the composites. When the content of AC foaming agent was more than 5%, the apparent wall slip of the composites was observed. With the increase of melt index, the foaming of composite foaming material became larger, When the melt index is 1.5, the cell size is moderate and evenly distributed.