弹性体对PP/EVA无胶复合膜性能影响研究  

Effect of elastomer on the properties of glue-free PP/EVA composite films

作　　者：苏羽航 周宇鸿 林渊智 毛健全 王永祥 刘向 余立 柯俊沐 SU Yuhang;ZHOU Yuhong;LIN Yuanzhi;MAO Jianquan;WANG Yongxiang;LIU Xiang;YU Li;KE Junmu(Fujian Polytechnic Normal University,Fuzhou 350300,China;FOROP Advanced Materials Co,Ltd,Fuzhou 350300,China;Tianjin Huaheng Packaging Materials Co,Ltd,Tianjin 300450,China;Fujian Universities and Colleges Engineering Research Center of Soft Plastic Packaging Technology for Food,Fuzhou 350300,China;Technical Creation Center for Packaging Engineering in Fuzhou,Fuzhou 350300,China)

机构地区：[1]福建技术师范学院,福州350300 [2]福融新材料股份有限公司,福州350300 [3]天津市华恒包装材料有限公司,天津300450 [4]食品软塑包装技术福建省高校工程研究中心,福州350300 [5]福州市包装工程行业技术创新中心,福州350300

出　　处：《中国塑料》2024年第6期44-50,共7页China Plastics

基　　金：福建省科技厅工业引导性项目(2020H0028);企业横向项目(HX2022078)。

摘　　要：以EVA作为黏合层的主要材料,以弹性体作为芯层与黏合层的增容剂,并共混造粒制备聚丙烯(PP)/EVA/弹性体共混体系、流延共挤制备3层无胶复合薄膜。通过对共混材料力学性能测试、DMA测试、流变性能测试、扫描电子显微镜、薄膜性能测试等对共混体系及薄膜性能进行研究。结果表明,醋酸乙烯含量为18%的EVA与纸张黏合效果最好;弹性体PBE对混合体系力学性能的提升优于POE;当PBE在共混体系中含量逐渐增加时,PP与EVA的玻璃化转变温度逐渐增加,Cole-Cole弧度逐渐增大,PP与EVA相容性越来越好;当PBE在黏合层EVA中含量为30%时,PP/PP/EVA 3层共挤薄膜拉伸强度达到最大值29 MPa,随后减小;PBE含量为20%时,与纸张的黏合强度达到最大值9 N/15 mm,随后减小;PBE含量达到25%时,芯层与黏合层无法剥离,复合牢固不分层;因此,PBE在黏合层中的添加量为25%最为合适。Three-layer glue-free composite films based on a PP/EVA/elastomer blending system were prepared through melt blending and cast co-extrusion using EVA as an adhesive layer and different elastomers as a compatibilizer for the PP core layer and adhesive layer.The resultant blending system was analyzed by means of mechanical tests,DMA tests,rheological tests,and scanning electron microscopy,and the properties of the composite films were investigated.The results indicated that there was an optimal bonding effect on paper when using the EVA containing 18 wt%vinyl acetate.The PBE elastomer exhibited a more significant improvement in the mechanical properties than POE.The glass transition temperature of PP and EVA increased gradually with an increase in the PBE content,and meanwhile the curvature of Cole-Cole also increased gradually,indicating that the compatibility between PP and EVA became better and better.When the content of PBE in the EVA adhesive layer was 30 wt%,the tensile strength of the composite films reached a maximum value of 29 MPa.The adhesive strength of the composite films with paper reached at maximum value of 9 N/15 mm at a PBE content of 20 wt%.The core layer and adhesive layer cannot be peeled off for the composite films at a PBE content of 25 wt%.The composite films are robust without delamination in this case.The optimal loading of PBE in the adhesive layer was determined to be 25 wt%.

关 键 词：无胶复合膜 乙烯-醋酸乙烯共聚物 弹性体 共混改性 

分 类 号：TQ317.2[化学工程—高聚物工业]