热罐装瓶PET/PCTG共混性能研究

Properties of Blends of Polyethylene Terephthalate(PET) and Poly(ethylene-co-cyclohexane1,4-dimethanol) Terephthalate(PCTG) for Hot-filled Bottles

目的研究聚对苯二甲酸乙二醇酯-1,4-环己烷二甲醇酯(PCTG)与聚对苯二甲酸乙二醇酯(PET)的共混相容性,和PET/PCTG共混材料热罐装瓶的注塑拉伸吹塑成型性。方法分别测定PET,PCTG和PET/PCTG共混材料的差示扫描量热(DSC)曲线和热重分析(TG)曲线以及特性黏度,研究PET,PCTG和PET/PCTG共混材料的结晶性能和共混相容性。结果 PET具有良好的结晶性,而PCTG却没有结晶性,当PET与PCTG质量比值<32.7%时,两者共混具有良好的相容性;两者共混也会造成PET冷结晶温度明显下降,且升温速率越大,降低幅度越大。结论 PET与PCTG共混有良好的相容性,可提高热罐装的耐热温度,但PET/PCTG共混物瓶的注塑拉伸温度范围会比PET瓶窄。

This paper studied the compatibility of poly（ethylene-co-cyclohexane1,4-dimethanol） terephthalate（PCTG） with polyethylene terephthalate（PET） and the processing property of PET/PCTG hot-fill bottles by injection-stretch-blow molding. Crystallinity and compatibility of PET and PCTG were analyzed using differential scanning calorimetry（DSC） curve, thermogravimetry（TG） curve and intrinsic viscosity. PET had good crystallization and PCTG was no-crystallization. PET/PCTG blends were well when PET/PCTG 32.7%. The cold crystallization temperature of PET was lower in PET/PCTG blends than pure PET. The larger the rate of rising temperature was, the larger the decrease amplitude of crystallization temperature of PET was. PET was well compatible with PCTG and the heat durability of PET/PCTG bottles could be improved by blending with PCTG, but the temperature range of stretch blow molding of PET/PCTG-blended bottles would be narrower compared to PET bottles.