新型EVOH/PE-RT合金包覆PE-RT双层阻氧管的制备及性能研究

Preparation and Performance of New EVOH/PE-RT Alloy-coated PE-RT Double-layer Oxygen Barrier Tube

针对市场上常见的阻氧管存在难以热熔回收再用的问题,制备了新型乙烯-乙烯醇共聚物(EVOH)/耐热聚乙烯(PE-RT)合金包覆PE-RT双层阻氧管,其内层工作管为PE-RT材质,外层为EVOH/PE-RT合金阻隔材料;研究了EVOH和相容剂含量对EVOH/PE-RT合金阻隔膜阻氧性能的影响,并对新型双层阻氧管的氧气透过量和热熔回收情况以及新型双层阻氧管回收料的力学性能进行了测试。结果表明,EVOH/PE-RT合金阻隔膜的氧气透过量随EVOH含量的增加而降低,随相容剂含量的增加而上升;含30%(质量分数,下同)EVOH、64%PE-RT和6%相容剂的新型双层阻氧管的氧气透过量接近市售3层、5层阻氧管,并且能够实现热熔回收,回收料具有较好的力学性能。

Aiming at the problem that the common oxygen barrier pipes on the current market cannot be easily hot melted and recycled,a new type of ethylene-vinyl alcohol copolymer(EVOH)/heat-resistant polyethylene(PE-RT)alloy coated with a PE-RT double-layer oxygen barrier was prepared.The inner working tube was made using PE-RT as a raw material,and the outer layer was fabricated with an EVOH/PE-RT alloy barrier material.The effect of EVOH and compatibilizer contents on the oxygen barrier performance of EVOH/PE-RT alloy barrier film was studied.The oxygen permeability and hot melt recovery of the new double-layer oxygen barrier tube and the mechanical properties of the recovered material obtained from this oxygen barrier tube were evaluated.The results indicated that the oxygen permeability of the EVOH/PE-RT alloy barrier film decreases with an increase in EVOH content and tends to increase with an increase in the compatibilizer content.The new double-layer oxygen barrier tube containing 30 wt%EVOH,64 wt%PE-RT and 6 wt%compatibilizer exhibited oxygen permeability similar to the commercially available 3-layer and 5-layer oxygen barrier tube,and hot-melt recovery could be realized in this tube.Meanwhile,the recovered material presented good mechanical properties.