Abstract:

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 %.

Key words: recycling, polyethylene terephthalate, linear low?density polyethylene, polyethylene, alloy, sheet