| 摘要: |
| 目的 通过研究不同气体在包装材料中渗透行为的差异及影响因素，以探讨包装材料的适用性，为改善薄膜的分离效果提供参考。方法 采用压差法分别测试O2，N2，CO2在BOPP，PET，PE薄膜样品中的气体渗透性，并利用时间滞后法计算出气体的扩散系数，通过对气体透过系数和扩散系数的计算获得溶解度系数。结果 3种薄膜的气体透过系数、溶解度系数的大小顺序均为CO2＞O2＞N2，扩散系数在BOPP，PE膜中的关系为O2＞CO2＞N2，在PET膜中的关系为O2＞N2＞CO2；得到了BOPP，PET，PE薄膜中气体透过系数的比值，CO2/O2分别为2.7，3.8，3.7，CO2/N2分别为14.4，25.0，14.3。结论 气体分子直径及其与薄膜分子的相互作用是影响气体扩散系数的主要因素，气体临界温度及分子间的相互作用是影响溶解度系数的主要因素；在扩散系数和溶解度系数的共同作用下，气体在3种薄膜中的渗透由快到慢依次为CO2，O2，N2。另外，PET，PE对CO2，O2的分离能力较好，PET对CO2，N2的分离能力最好。 |
| 关键词: 气体透过量 气体透过系数 扩散系数 溶解度系数 压差法 渗透行为 |
| DOI：10.19554/j.cnki.1001-3563.2018.13.007 |
| 分类号:TS206.4 |
| 基金项目: |
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| Permeation Activities of Gases in Packaging Materials Based on Differential-pressure Method |
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YU Jia-jia1, CHEN Xin1, WANG Lian-jia1, GUAN Shan-guo2
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1.Labthink Instruments Co., Ltd., Jinan 250031, China;2.Jinan Institute of Measurement and Verification, Jinan 250002, China
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| Abstract: |
| The work aims to compare the different permeation activities of various gases in packaging material and analyze factors that influence such activities, which provides reference for study of applicability of packaging materials and improving the separation effect of films. Gas permeability of O2, N2 and CO2 through BOPP, PET and PE film samples was tested respectively with differential-pressure method. Diffusion coefficients of the three gases were calculated with time-lag method and the solubility coefficients were obtained by calculating the gas permeability coefficient and diffusion coefficient. The results showed that the order of gas permeability coefficients and solubility coefficients was CO2＞O2＞N2 for all the three films, while diffusion coefficients were in the order of O2＞CO2＞N2 for BOPP and PE films, and O2＞N2＞CO2 for PET film. The ratios of permeability coefficients of CO2/O2 were 2.7, 3.8 and 3.7, while the ratios of permeability coefficients of CO2/N2 were 14.4, 25.0 and 14.3 for BOPP, PET and PE films, respectively. Diameter of gas molecule and its interaction with film molecules are the main factors that influence gas diffusion coefficient, while gas critical temperature and interaction between molecules are the main factors that influence solubil-ity coefficient. For gas permeation rate, from fast to slow, it is CO2, O2 and N2 in all the three films under combined action of diffusion coefficient and solubility coefficient. Among these three films, PET and PE have better separation effect for CO2 and O2, while PET has better separation effect for CO2 and N2. |
| Key words: gas transmittance gas permeability coefficient diffusion coefficient solubility coefficient differential-pressure method permeation activity |
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