蒙脱土与MFC涂层对聚丙烯膜阻隔性能的影响

目的为了提高聚丙烯薄膜的阻隔性,利用涂布的方法研究蒙脱土与微纤化纤维素(MFC)含量对涂布膜阻隔性能的影响。方法以蒙脱土和MFC为主要原料,加入胶黏剂、增稠剂、分散剂制备成涂料,并涂布在双向拉伸聚丙烯薄膜上,以薄膜的氧气透过率、水蒸气透过率、红外光谱分析、XRD分析和热稳定性分析作为评判标准,对薄膜性能进行表征与分析。结果在添加的蒙脱土质量分数为2%,MFC质量分数为0.5%时,双组分涂布膜的氧气透过系数达到最低,较聚丙烯薄膜氧气透过系数下降了97%,水蒸气透过系数在添加蒙脱土质量分数为2%,MFC质量分数为0.3%时达到最低,较聚丙烯薄膜水蒸气透过系数下降了22%,XRD显示当MFC质量分数为0.5%时,插层结构最优,通过热稳定性分析得出,双组分涂布膜在蒙脱土质量分数为2%,MFC质量分数为0.5%时热稳定性最好。结论通过综合分析得出,涂布蒙脱土与MFC双组分涂层可有效提高聚丙烯薄膜的阻隔性能。

Effect of Montmorillonite and MFC Coating on the Barrier Properties of Polypropylene Film

The work aims to study the influence of the content of montmorillonite and micro fibrillated cellulose (MFC) on the barrier properties of the coating film by coating, in order to improve the barrier properties of the polypropylene film. With montmorillonite and MFC as the main raw materials, the adhesives, thickeners and dispersants were added to prepare a coating and apply it on the biaxially oriented polypropylene (BOPP) film. The film''s oxygen permeability, water vapor permeability, infrared spectrum annalysis, XRD analysis and thermal stability analysis were used as evaluation criteria to characterize and analyze the film''s properties. When the mass fraction of montmorillonite was 2% and the mass fraction of MFC was 0.5%, the oxygen permeability coefficient of the two-component coating film reached the lowest, which was 97% lower than that of the polypropylene film. When the mass fraction of montmorillonite was 2% and the mass fraction of MFC was 0.3%, the water vapor permeability coefficient was the lowest, which was 22% lower than that of the polypropylene film. XRD showed that, when the mass fraction of MFC was 0.5%, the intercalation structure was the best. The thermal stability analysis showed that, the two-component coating film had the best thermal stability when the mass fraction of montmorillonite was 2% and the mass fraction of MFC was 0.5%. The comprehensive analysis concludes that the application of two-component coating added with montmorillonite and MFC can effectively improve the barrier properties of the polypropylene film.