无孔双向拉伸超高分子量聚乙烯薄膜的成型工艺及性能  

Molding process and properties of non-porous biaxially stretched ultra-high molecular weight polyethylene films

作　　者：王荣勇[1] 李景波 刘小超 WANG Rongyong;LI Jingbo;LIU Xiaochao(Zhuzhou Times New Material Technology Co.,Ltd.,Zhuzhou 412007,China;College of Packaging and Materials Engineering,Hunan University of Technology,Zhuzhou 412007,China)

机构地区：[1]株洲时代新材料科技股份有限公司,湖南株洲412007 [2]湖南工业大学包装与材料工程学院,湖南株洲412007

出　　处：《工程塑料应用》2025年第3期96-103,共8页Engineering Plastics Application

摘　　要：采用薄膜双向拉伸试验机制备了无孔双向拉伸超高分子量聚乙烯(PE-UHMW)薄膜,探究了双向拉伸PEUHMW薄膜的成型工艺,研究了双向拉伸工艺参数对双向拉伸PE-UHMW薄膜晶体结构、力学性能以及光学性能的影响。结果表明,当拉伸速率达到200%/s或者拉伸比大于3×3时,有助于PE-UHMW薄膜中串晶结构的形成。双向拉伸PE-UHMW薄膜中仅有正交晶存在,双向拉伸可以显著减小薄膜的晶粒尺寸。双向拉伸对PE-UHMW薄膜的力学性能影响显著,随着拉伸速率以及拉伸比的增大,薄膜的拉伸强度也随之增大,当薄膜中出现串晶结构后薄膜拉伸强度增大更加明显,拉伸比为6×6的薄膜在纵向与横向的拉伸强度分别达到了201.7 MPa与183.7 MPa,相比未拉伸前提高了4.56倍和3.69倍。薄膜的耐穿刺强度随着薄膜拉伸比的增大而增大,拉伸比为6×6的薄膜耐穿刺强度达到了623.3 N/mm,是未拉伸前的9.7倍。拉伸比达到3×3后,薄膜透光率稳定在93%左右,而薄膜的雾度受晶粒尺寸的影响随着拉伸速率以及拉伸比的增大呈现先减小后增大的趋势。无孔双向拉伸PE-UHMW薄膜具有较高的强度以及良好的透光率,在包装领域具备潜在的应用前景。The non-porous biaxially stretched ultra-high molecular weight polyethylene(PE-UHMW)film was prepared by film biaxial stretching testing machine.The molding process of the biaxially stretched PE-UHMW film was explored.The effects of biaxial stretching process parameters on the crystal structure,mechanical properties and optical properties of the films were studied.The results show that when the stretching rate reaches 200%/s or the stretching ratio is greater than 3×3 the shish-kebab structure appears in the biaxially stretched PE-UHMW film.There are only orthorhombic crystals in the biaxially stretched PE-UHMW film,and biaxial stretching can significantly reduce the crystallite size of the film.Biaxial stretching has a significant effect on the mechanical properties of PE-UHMW films.The tensile strength of the film increases with the increase of stretching rate and stretching ratio.The tensile strength of PE-UHMW film with a stretching ratio of 6×6 reaches 201.7 MPa and 183.7 MPa in MD and TD directions,respectively,which is 4.56 times and 3.69 times higher than that before stretching.The anti-puncture strength of the film increases with the increase of the film stretching ratio,and the anti-puncture strength of the film with a stretching ratio of 6×6 reaches 623.3 N/mm,which is 9.7 times that of the unstretched film.After the stretching ratio reaches 3×3,the transmittance of the films is stable at about 93%,and the haze of the films is affected by the grain size,which decreases first and then increases with the increase of the stretching rate and the stretching ratio.The non-porous biaxially stretched PE-UHMW film has high strength and excellent transmittance,which has potential application prospects in the field of packaging.

关 键 词：超高分子量聚乙烯薄膜 双向拉伸 晶体结构 力学性能 光学性能 

分 类 号：TQ325[化学工程—合成树脂塑料工业]