| 摘要: |
| 目的 通过调节包装内的湿度，以达到果蔬生长的适宜湿度环境，从而延缓新鲜果蔬的霉变及腐烂速率，延长其保质期，并降低产品损失率。方法 将高吸水性树脂PVA与纳米分子筛均匀混合，配制成具有保湿功能的涂布溶胶，采用涂布法将该溶胶与包装基体材料PE相复合，得到一种具有防霉保鲜功能的新型食品包装薄膜。利用电子万能试验机、透氧测试仪、透湿测试仪等仪器测定该复合薄膜的力学性能、阻隔性和透湿性。结果 PVA纳米分子筛/PE复合薄膜在纳米粉体质量分数为1.0%左右时对薄膜物理性能的影响较低，且具有较高的保湿性能，其透气性系数相比未做涂布处理的基材PE大幅降低，透湿量下降20%。结论 该复合薄膜在新鲜果蔬的运输、贮存等方面具有潜在的应用价值。 |
| 关键词: 防霉保鲜 包装薄膜 高吸水性树脂 保湿性能 |
| DOI：10.19554/j.cnki.1001-3563.2019.03.002 |
| 分类号:TB484.3 |
| 基金项目:国家自然科学基金（51503084，31671909）；江苏省食品先进制造装备技术重点实验室开放课题（FM-201606） |
|
| Preparation and Characterization of Polyvinyl Alcohol-based Molecular Sieve Coated Polyethylene Film |
|
DANG Jin-gui1, QIU Xiao-lin1,2, TANG Ya-li1,2, MENG Yan-yu2
|
|
1.Jiangnan University, Wuxi 214122, China;2.Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, Wuxi 214122, China
|
| Abstract: |
| The work aims to reach a suitable humidity environment for the growth of fruits and vegetables by adjusting the humidity in the package, thus delaying the mildew and decay rate of fresh fruits and vegetables, prolonging their shelf life and reducing the loss rate of products. The superabsorbent resin PVA and the nano-zeolite were uniformly mixed to prepare a coating sol with moisture retention function, and the sol was applied to the base material PE of the package by coating method to obtain a new type of food packaging film with mildew prevention and fresh-keeping function. The mechanical property, barrier property and moisture permeability of the composite films were measured by electronic universal testing machine, oxygen permeation analyzer and moisture tester. The PVA nano-zeolite/PE composite film had lower impact on the physical properties of the film when the mass fraction of nano powder was about 1.0%, and it had higher moisture retention. Compared with the base material PE without coating treatment, its air permeability coefficient was greatly reduced, and the water vapor permeability was reduced by 20%. The composite film has potential application value in transportation and storage of fresh fruits and vegetables. |
| Key words: mildew prevention and fresh-keeping packaging film superabsorbent resin moisture retention |
