| 摘要: |
| 目的 将微纤化纤维素(MFC)和聚乳酸(PLA)共混成膜，以提高薄膜的透湿、透氧、阻光等性能，满足果蔬等食品的包装要求。方法 采用酶解法与机械处理的方法制备MFC，使用硅烷偶联剂KH560对MFC进行疏水改性处理，再将改性处理的微纤化纤维素(MFC-S)与PLA共混制成薄膜。结果 当MFC-S的质量分数为0.75%时，MFC-S/PLA共混包装膜的拉伸强度比纯PLA膜增加了13.3%，当MFC-S的质量分数为2%时，MFC-S/PLA共混包装膜的透氧系数为纯PLA膜的1.43倍，透湿系数为纯PLA膜的1.26倍，透光率降低了60%，阻光效果较好。结论 MFC-S的质量分数为0.75%时，包装膜的拉伸强度较好；MFC-S的质量分数为2%时，透氧、透湿、阻光性较好。 |
| 关键词: 微纤化维素 聚乳酸 硅烷改性 共混包装膜 |
| DOI： |
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| 基金项目:天津市应用基础与前沿技术研究计划青年项目（15JCQNJC42300） |
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| Preparation of Microfibrillated Cellulose/Polylactic Acid Film and Its Property Analysis |
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TANG Li-li, CHEN Yun-zhi, ZHANG Zheng-jian, ZHAO Hua-feng
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Tianjin University of Science and Technology, Tianjin 300222, China
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| Abstract: |
| The paper aims to blend Microfibrillated cellulose (MFC) and polylactic acid (PLA) to form membrane to improve moisture permeability, oxygen permeability and light resistance, etc. of the film to meet requirements on packaging of fruits, vegetables, etc. MFC was prepared by enzymatic hydrolysis and mechanical treatment. Coupling agent KH560 was applied to have hydrophobic modification treatment of MFC. The modified PLA (MFC-S) was mixed with PLA to prepare thin film. When the MFC-S content was 0.75%, the tensile strength of MFC-S/PLA blend film was 13.3% more than that of the pure PLA film. When the content of MFC-S was 2%, the oxygen permeability coefficient of MFC-S/PLA blend film was 1.43 times of the pure PLA film, its moisture permeability coefficient was 1.26 times of the pure PLA film, and its light transmittance was reduced by 60%. It had good light blocking effect. The packaging film has good tensile strength when the content of MFC-S is 0.75%; the film has good oxygen permeability, moisture permeability and light resistance when the content of MFC-S is 2%. |
| Key words: micro fibroin polylactic acid silane modification blend packaging film |
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