王硕,秦莹莹,郭红革.沸石填充改性聚乳酸基薄膜的阻隔性能[J].包装工程,2021,42(11):116-123.
WANG Shuo,QIN Ying-ying,GUO Hong-ge.Barrier Properties of Polylactic Acid-Based Film Modified by Zeolite Filling[J].Packaging Engineering,2021,42(11):116-123. |
| 沸石填充改性聚乳酸基薄膜的阻隔性能 |
| Barrier Properties of Polylactic Acid-Based Film Modified by Zeolite Filling |
| 投稿时间：2020-08-17 |
| DOI：10.19554/j.cnki.1001-3563.2021.11.017 |
| 中文关键词: 聚乳酸 沸石 吹膜 改性 阻隔性 |
| 英文关键词: polylactic zeolite blown film modification barrier |
| 基金项目:齐鲁工业大学国际合作项目(45040127) |
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| 中文摘要: |
| 目的 研究沸石粉末作为填充剂对聚乳酸(PLA)薄膜阻隔性能的影响。方法 选用环氧大豆油为增塑剂，提高材料的柔韧性，通过熔融共混将质量分数分别为2%，4%，6%，8%，10%的沸石粉末与PLA共混，测试沸石/PLA吹塑薄膜阻隔性能的变化。结果 与纯PLA材料相比，随着沸石含量的增加，改性后的PLA材料透明度降低、雾度升高、透湿透氧性能先增强后减弱;当沸石质量分数为8%时，复合材料的阻隔性能最强，氧气透过系数、二氧化碳透过系数和水蒸气透过系数达到最低，分别为0.59×10−8 cm3.cm/(cm2.s.Pa)，1.95×10−8 cm3.cm/(cm2.s.Pa)和2.79×10−7 g.m/(m2.h.Pa)，较纯PLA分别降低了11.94%，8.45%，21.63%。结论 采用沸石改性PLA薄膜时，由于内部沸石分子的存在，当沸石添加超过一定量，其形成的空间结构使气体(氧气、二氧化碳和水蒸气)扩散难度增加，与纯PLA薄膜相比，阻气阻湿(阻隔)效果优良。 |
| 英文摘要: |
| The purpose of this experiment is to study the effect of zeolite on the blocking performance of polylactic acid (PLA) film. The method is to mix the mass fractions of 2%, 4%, 6%, 8% and 10% zeolite with PLA by melting, and add epoxy soybean oil to improve the flexibility of the material, and then test the change of zeolite/PLA blow molding film barrier performance with the instrument. The results showed that compared with pure PLA material, the transparency of modified PLA material decreased, crystallization and fog increased, and the oxygen permeability of permeable oxygen was enhanced and then decreased with the increase of zeolite mass fraction. When the zeolite content was 8%, the barrier performance of the composite material was the strongest, the oxygen permeability coefficient was 0.59×10−8 cm3.cm/(cm2.s.Pa), the carbon dioxide permeability coefficient was 1.95×10−8 cm3.cm/(cm2.s.Pa) and the water vapor transmission coefficient was 2.79×10−7 g.m/(m2.h.Pa), all of these are the lowest level. It can be concluded that due to the presence of internal zeolite molecules and the spatial structure formed by it, the diffusion of gas in zeolite modified PLA film is more difficult when the zeolite is added more than a certain amount. Compared with pure PLA film, the composite film (oxygen, carbon dioxide and water vapor) has an excellent gas and moisture barrier effect. |
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