双向拉伸聚氟乙烯薄膜的拉伸工艺研究  

Stretching Process of Bi-axially Oriented PVF Films

作　　者：王婧[1] 苑会林[1] 周玉生[1] 李洪飞[1] 

机构地区：[1]北京化工大学新型高分子材料的制备与加工北京市重点实验室,北京100029

出　　处：《中国塑料》2006年第12期60-64,共5页China Plastics

摘　　要：探讨了聚氟乙烯(PVF)流延膜在制备过程中常见的缺陷及产生原因,并给出了具体的加工工艺参数。结合PVF 薄膜的双向拉伸机理,通过力学及热性能测试表明:膜片的纵向拉伸温度为120～135℃,拉伸比为2.5～3.0时,薄膜不会出现细颈现象,且所需拉伸应力较小;当横向拉伸温度控制在130～150℃,拉伸比为2.5～3.5时,薄膜厚度介于23～28μm之间,且力学性能基本保持各向同性;双向拉伸的薄膜经过170～180℃热定型之后,横、纵向收缩率均小于2%,具有良好的尺寸稳定性。The reasons for some frequent problems and the optimum technological parameters in the production of PVF casting film were investigated. The stretching mechanism of the bi-axially oriented PVF （BOPVF） film and the mechanical properties were studied. When the longitudinal stretch temperature was 120～135 ℃ and the stretch ratio was 2.5～3.0. The casting film could be easily stretched without necking. When the transverse stretch temperature was 130～150 ℃ and the stretch ratio was 2.5～3.5, the thickness of BOPVF was between 23 and 28 μm. After the heat setting at 170～180 ℃, the dimensional stability of BOPVF films obviously improved and the shrinkage ratio at both directions was less than 2 %.

关 键 词：双向拉伸 聚氟乙烯薄膜 拉伸机理 工艺 

分 类 号：TQ320.721[化学工程—合成树脂塑料工业]