以回收聚酯为主要原料的PET/PE合金片材的研制及应用

以自制接枝共聚相容剂，将回收聚对苯二甲酸乙二醇酯（rPET）分别与全新线性低密度聚乙烯（PE?LLD）和回收聚乙烯（rPE?HD）共混改性，采用具备免干燥和侧面强制喂料系统的同向双螺杆挤出机熔融挤出rPET/PE合金片材（rPET与PE质量比为80∶20），研究了不同厚度合金片材的性能。结果表明，使用rPET制备的合金片材产品外观品质保持较好； rPET/PE合金片材具有良好的力学性能，其中拉伸强度大于39 MPa，断裂伸长率随片材厚度增加而递减，厚度为2.5 mm的rPET/rPE合金片材拉伸强度为39.7 MPa，断裂伸长率为21 %，冲击强度为12 kJ/m²，适合应用于吸塑箱包、土工格室等；免干燥和侧面强制喂料系统，可以减少合金片材加工流程，节约能源，设备产量提了117 %。

Development and Application of PET/PE Alloy Sheet by Recycling Polyester

The recycled polyethylene terephthalate （rPET） was blended and modified with the original linear low?density polyethylene （PE?LLD） and recycled polyethylene （rPE?HD） by using a self?made graft copolymer compatibilizer， respectively. The rPET/PE alloy sheet （mass ratio of 80∶20） was extruded by a co?rotating twin?screw extruder with drying?free and side?forced feeding system. The performance of rPET/PE alloy sheets with different thicknesses was researched . The results show that the appearance quality of the alloy sheet products prepared by using rPET maintains better. The rPET/PE alloy sheet has good mechanical properties. The tensile strength is greater than 39 MPa， and the elongation at break decreases with the increase of the thickness of the sheet. The tensile strength of 2.5 mm rPET/PE alloy sheet is 39.7 MPa， and the elongation at break is 21 %， and the impact strength is 12 kJ/m². It is suitable for blister bags， geocells， etc. Drying?free and side forced feeding system can reduce the alloy sheet manufacturing processes， save energy ， and the yield increased 117 %.