生物降解塑料薄膜吹塑工艺及其性能研究

引进德国BASF公司的生物降解塑料Ecoflex聚酯,利用挤出吹塑法制得了全生物降解塑料薄膜。结果表明：Ecoflex吹膜加工工艺条件为加料段温度135℃,塑化段温度150℃,均化段温度160℃,主轴转速150 r/min,得到了平均膜厚为0.02 mm的Ecoflex薄膜。该薄膜具有与低密度聚乙烯（LDPE）薄膜相近的性能,其拉伸强度纵向为35.2 MPa,横向为21.7 MPa;断裂伸长率纵向为388.4%,横向为817.1%;直角撕裂强度纵向为85.24 N/mm,横向为105.81 N/mm。在受控堆肥试验条件下,130 d薄膜的生物分解率达到65%。

Blow Molding Process of Biodegradable Plastic Film and Its Properties

With Ecoflex polyester introduced from BASF company of German,biodegradable plastic film was produced by blow molding process.The results indicated that process temperature was 135 ℃,150 ℃,160 ℃ for feeding section,plasticizing section,and homogenizing section,respectively.Its spindle speed was 150 r/min.Under these conditions,0.02 mm in thickness of Ecoflex film was obtained.The film has similar properties to LDPE film bearing 35.2 MPa of stretching strength in longitude,21.7MPa of lateral strength;388.4% of tensile fracture rate in longitude,817.1% of lateral rate;85.24 N/mm of tangential breaking strength in longitude,105.81 N/mm of lateral strength.If 130 days given,biodegradable rate of the film will reach 65% in a controlled compost experiment.