纳米ɑ-Fe_2O_3改性聚乙烯醇基蜂蜡复合涂膜材料工艺优化  

Technology optimization of nanosized α-Fe_2O_3 and beeswax modified polyvinyl alcohol based composite packaging material

作　　者：李璨[1] 王佳媚[1] 龙门[1] 刘瑶[1] 刘桂超[1] 顾凤兰[1] 章建浩[1] 

机构地区：[1]国家肉品质量与安全控制工程技术研究中心,农业部畜产品加工与质量控制重点开放实验室,食品安全与营养协同创新中心,南京农业大学食品科技学院,南京210095

出　　处：《农业工程学报》2014年第3期243-250,共8页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家科技支撑计划课题动物源食品加工共性关键技术研究(2012BAD28B01);苏州市科技计划项目(ZXG2012033);常熟市人才计划项目(CSRC1131)

摘　　要：为有效的提高聚乙烯醇(polyvinyl alcohol,PVA)的成膜后阻湿性能,该研究采用乳化剂聚甘油酯和单甘酯复配乳化蜂蜡使其与PVA形成稳定的乳液。在PVA基膜材料中添加了蜂蜡及纳米α-Fe2O3,利用单因素试验确定了响应曲面试验的因素水平,从而使用响应面试验研究了两者之间对成膜透湿率的影响和交互作用。结果表明:随着蜂蜡添加量增加纳米α-Fe2O3添加量临界值降低且有效降低成膜透湿率,所以这2种材料之间存在明显的交互作用(P<0.05)。回归优化的最优组蜂蜡添加量为0.739 g/100mL,纳米α-Fe2O3添加量为0.04 g/100mL时透湿率达到最低点,比对照组膜降低了73.76%(P<0.05)。优化的膜材料具有明显的抑菌效果,在光催化条件下,能使大肠杆菌菌落总数下降1个数量级。Polyvinyl alcohol has been widely used as a packaging substrate, but its water resistance is poor. Improving the water resistance of polyvinyl alcohol is critical. In this study the major modification methods were to add nano-materials, fats or oil substances and crosslinking agents. Functional nanomaterials have small size, large surface area that combine the hydroxyl group with polyvinyl alcohol to reduce the hydrophilic. Beeswax is a composition material by fats and oils. It has higher melting point, acid corrosion, water-blocking performance characteristics. Furthermore it can form a stable emulsion, resulting in long shelf life, high solid content, good dispersion and other fine features. Beeswax is widely used in fruit and vegetable preservation, fruits and vegetables can reduce the water loss rate and respiration. In this experiment a stable emulsion with polyvinyl alcohol （PVA） was formed from hydrophobic of beeswax and the small surface area, high activity of nanosized α-Fe2O3 to reduce film water vapor transmission rate of packing material of polyvinyl alcohol efficiently. By adding beeswax and nanosized α-Fe2O3 to polyvinyl alcohol based composite coating material, the impacts of film-forming water vapor transmission rate and its interaction was studied through analyzing the response surface between the two experimental factors. The result showed that the increasing amount of beeswax and then nosized α-Fe2O3 could reduce the water vapor transmission rate of polyvinyl alcohol composite material effectively. Therefore two materials have mutual impacts （P〈0.05）. The beeswax dosage was 0.739 g/100mL, and nanosized α-Fe2O3 was 0.04 g/100mL based on the regression optimization. The water vapor transmission rate reached the lowest point, which was lower than the former Liquid paraffin-polyvinyl alcohol film 73.76% （P〈0.05）. Meanwhile, nanosized α-Fe2O3 could be used as a new nano-material. Its narrow band gap generally was 2.2 eV, the maximum absorption wavelength was 560 nm that increase

关 键 词：优化 薄膜 菌 纳米Α-FE2O3 蜂蜡 PVA 透湿率 光催化抑菌 

分 类 号：TS206.4[轻工技术与工程—食品科学]