聚丙烯/线型低密度聚乙烯开孔泡沫的制备及吸油性能

Preparation of Open-cell Polypropylene/Linear Low Density Polyethylene Blend Foams and the Oil Sorption Performance

以超临界二氧化碳为发泡剂,通过连续挤出发泡法制备聚丙烯/线型低密度聚乙烯(PP/LLDPE)共混物开孔泡沫,并用于吸油性能研究。文中系统研究了发泡温度、原料配比和口模直径对PP/LLDPE泡沫开孔结构和吸油倍率的影响,并研究了泡沫的亲油疏水性和吸油的重复使用性。结果表明,当发泡温度为170℃,LLDPE的含量为10%,口模直径为0.5 mm时,发泡样品的密度低、开孔率高、吸油倍率高;PP/LLDPE泡沫对水的接触角为137.8°,疏水性能好;对机油10次重复使用后仍具有很高的吸油倍率。因此,该复合开孔泡沫在污水处理、溢油事故和环境保护中具有潜在的应用价值。

Open-cell polypropylene/linear low density polyethylene （PP/LLDPE） blend foams were prepared via continuous extrusion with supercritical carbon dioxide. The effect of foaming temperature, LLDPE content and die diameter on the open-cell structure and oil sorption performance of PP/LLDPE foams were investigated. The oleophilic-hydrophobic properties and reusability were also studied. The results show that PP/LLDPE foams exhibit low density, high open-cell content and high oil sorption capacity at the foaming temperature of 170℃, LLDPE content of 10% and die diameter of 0.5 mm. A drop of water on PP/LLDPE foam forms a contact angle of 137.8°, indicating that the open-cell foam exhibits excellent hydrophobicity. When PP/LLDPE foam is repetitively used for ten times, it still shows a high sorption capacity with the motor oil. Based on this study, PP/LLDPE open-cell foams have showed great potential for wide applications in wastewater treatment, oil accident remediation and environmental protection.