纳米SiO_2、TiO_2改性PVA基液体石蜡复合涂膜保鲜包装材料

Modification of PVA-Based Composite Coating Packaging Material with Nano-SiO_2,Nano-TiO_2 and Liquid Paraffin

为降低聚乙烯醇(PVA)基涂膜保鲜包装材料成膜透湿性,采用液体石蜡乳化与PVA复配,应用响应面试验方法研究添加液体石蜡和纳米SiO2、TiO2改性对PVA基复合涂膜包装材料成膜透湿性能的交互作用及影响。结果表明:添加液体石蜡和纳米SiO2、TiO2改性可有效降低PVA基涂膜包装材料的透湿性能,优化组成膜透湿率(14.578g/(m2.h))比对照组(不加纳米材料PVA基液体石蜡复合膜)降低了26.02%(P<0.05);纳米SiO2与纳米TiO2和液体石蜡对成膜透湿率有显著的交互作用,随着纳米SiO2添加量的增加,复合涂膜材料成膜透湿率随着纳米TiO2比例的适当增大或液体石蜡的比例的适当减小而降低。

This study attempted to reduce the water vapor permeability（WVP） of PVA-based composite coating packaging films by adding nano-SiO2,nano-TiO2 and liquid paraffin.The individual and interactive effects of nanoSiO2,nano-TiO2 and liquid paraffin on the water vapor transmission of PVA-based composite films were investigated by response surface methodology.The results showed that the water vapor barrier performance of PVA-based composite coating-packaging material could be effectively enhanced by addition of liquid paraffin and nano-materials.The water vapor transmission rate,WVTR（14.578 g/（m2.h）） of composite films with optimized addition amounts of liquid paraffin and nano-materials was decreased by 26.02%（P 0.05） compared with the control group（with liquid paraffin but without nano-materials）.There were significant interactions between nana-SiO2 and nano-TiO2 and between nano-SiO2 and liquid paraffin on the water vapor transmission of PVA-based composite films.The water vapor transmission rate of PVA-based composite films with increasing addition amount of nano-SiO2 was reduced by increasing the proportion of nano-TiO2 or deceasing liquid paraffin.