可降解抑菌功能薄膜的制备及性能研究

目的研究可降解抑菌功能薄膜的制备及性能。方法将具有抗菌性能的丝瓜络纤维浸提液(LF)、微晶棉纤维素(MCC)粉末、聚乙烯醇(PVA)和乙烯醋酸乙烯酯共聚物(EVA)乳液进行不同比例的共混,采用水溶液流延成膜的方法制备出可控制释放LF抗菌剂的可降解薄膜,并研究薄膜的抗菌性能和生物降解性能。结果流延膜中LF的浓度越大,薄膜缓释出的鞣质及甙类物质的浓度越高,对微生物的抑制作用也越强,但当LF的质量分数高于25%时,薄膜的基本性能会受到影响。当LF/MCC添加量(质量分数)为20%时,与对照组相比,流延薄膜的抗菌性相对提高61.5%,堆肥条件下20 d后有44.8%的成分可发生降解。结论该包装薄膜属于较理想的生物降解材料。

Preparation and Properties of Biodegradable and Controllable Bacteriostatic Functional Film

This paper studied preparation and properties of biodegradable and controllable bacteriostatic functional film. Loofah fiber extractive liquid (LF), microcrystalline cellulose (MCC), polyvinyl alcohol (PVA) and ethylene vinyl acetate copolymer (EVA) emulsion were blended with different ratios. The degradable and LF controllable bacteriostatic film was prepared by aqueous tape-casting technology, and the antibacterial and biodegradable properties of the material were analyzed. With increase of the concentration of LF in the casting film, the concentration of tannins and glycosides released from the film increased accordingly and the inhibitory performance of microorganisms was stronger. However, the basic properties of the film were affected when the concentration of LF was higher than 25%. When the amount of LF/MCC was 20% (mass fraction), the antimicrobial property of the casting film increased 61.5% compared to the controls, and 44.8% of components degraded in 20 days in compost. The relavent data test showed this packaging film was an ideal biodegradable material.