摘要
聚丙烯流延薄膜(CPP)经印刷、制袋后可单独用于食品、服装、日用品等外包装.通过设计四因素三水平的正交试验,考察了助剂中主抗氧剂、辅助抗氧剂、成核剂、卤素吸收剂四个因素对中模量聚丙烯镀铝膜芯层专用料的氧化诱导期的影响,确定最佳助剂加入量后制备中模量聚丙烯镀铝膜芯层专用料CPP-A,并对比分析了CPP-A产品与市售料CPP-B的结构性能.结果表明:CPP-A的熔体流动速率为7.9 g/10 min,弯曲模量为1 549 MPa,简支梁冲击强度(23℃)为3.89 kJ/m2,拉伸屈服应力为36.6 MPa,重均相对分子质量达到30万以上,聚合物分散性指数(PDI)为4.15,结晶度达到52.37%.FTIR结果表明产品为均聚聚丙烯.XRD结果表明该聚丙烯主要晶型为α晶型.薄膜性能测试表明产品性能满足聚丙烯镀铝膜芯层专用料的需求.
Abstract
Polypropylene cast film(CPP)can be used alone for food,clothing,daily necessities,and other packaging after printing and making bags.Through the design of four factors and three levels of orthogonal tests,the effects of the main antioxidant,auxiliary antioxidant,nucleating agent,halogen absorbent four factors on the oxidation induction period of the medium modulus polypropylene aluminized film core special material were investigated.After determining the optimum amount of additives,the medium modulus polypropylene aluminized film core special material CPP-A was prepared,and the structural properties of CPP-A products and commercially available CPP-B were compared and analyzed.The results show that the melt flow rate of CPP-A is 7.9 g/10 min,the flexural modulus is 1 549 MPa,the impact strength(23℃)of simply supported beam is 3.89 kJ/m2,the tensile yield stress is 36.6 MPa,the weight average molecular weight is more than 300 000,the polymer dispersity index(PDI)is 4.15,and the crystallinity is 52.37%.Infrared results show that the product is homopolymerized polypropylene.XRD results show that the main crystal form of the polypropylene is α crystal form.The film performance test shows that the product performance meets the requirements of the special material for polypropylene aluminized film core layer.
国家科技期刊平台
NSTL
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