双向拉伸PA-6/高岭土共混阻隔薄膜的研究  

Biaxially Oriented PA-6/Kaolin Clay Blend Barrier Films

作　　者：廖贵何 LIAO Gui-he(Xiamen Changsu Industrial Co.,Ltd.,Xiamen 361026,China)

机构地区：[1]厦门长塑实业有限公司,厦门361026

出　　处：《包装工程》2021年第23期25-33,共9页Packaging Engineering

摘　　要：目的为了提高双向拉伸尼龙薄膜的阻隔性能和研究拉伸对薄膜性能的影响。方法以高岭土和尼龙-6(PA-6)为原料,通过熔融共混和双向拉伸技术,制备双向拉伸PA-6/高岭土共混阻隔薄膜。采用万能材料试验机、氧气透过测试仪、X射线衍射分析仪(XRD)和傅里叶变换红外光谱仪(FT-IR)等手段进行表征和分析。结果添加高岭土的质量分数为2.0%时,聚合物薄膜纵向和横向的拉伸强度分别提升了4.9%和6.5%,断裂伸长率也分别提升了6.0%和4.2%。添加的高岭土质量分数为4.0%时,聚合物薄膜的阻隔性能提高了16.51%。随着拉伸比的增大,聚合物薄膜的弹性模量和拉伸强度变大,断裂伸长率下降,阻隔性能更佳。XRD和FT-IR结果表明,拉伸促进γ晶型转变为结构更加稳定的α晶型。结论高岭土的加入较好地提高了聚合物薄膜的力学性能和阻隔性能。不同拉伸条件的讨论对进一步研究聚合物薄膜的拉伸机理、性能和工艺条件提供参考。The work aims to improve the barrier properties of biaxially oriented nylon film and study the effect of stretching on film properties.Kaolin clay and nylon-6(PA-6)were selected as raw materials to prepare the biaxially oriented PA-6/kaolin blend barrier films by melt blending and biaxially oriented technology.Tensile strength tester,oxygen transmission tester,X-ray diffraction analyzer(XRD)and Fourier transform infrared spectrometer(FT-IR)were used to characterize and analyze the properties of the films,respectively.When the mass fraction of kaolin clay was 2.0%,the tensile strength of the films in machine direction(MD)and transverse direction(TD)increased by 4.9%and 6.5%,and the elongation at break also increased by 6.0%and 4.2%,respectively.When the mass fraction of kaolin clay was 4.0%,the barrier properties of the films increased by 16.51%.The elasticity modulus,tensile strength and barrier properties of the films increased as the stretch ratio increased,while the elongation at break decreased.The results of XRD and FT-IR showed that stretching promoted the transformation ofγpolymorphs intoαpolymorphs which had a more stable structure.Thus,the addition of kaolin clay can improve the mechanical properties and barrier properties of the films.Also,the discussion of different stretching conditions can provide reference for further study on the stretching mechanism,properties and process conditions of the films.

关 键 词：高岭土 拉伸 双向拉伸薄膜 

分 类 号：TQ320.63[化学工程—合成树脂塑料工业]