聚乙烯醇基涂膜材料纳米SiO2改性对其成膜包装效能特性的影响

采用纳米SiO2对聚乙烯醇(PVA)基复合涂膜包装材料进行改性,通过测定PVA基纳米复合涂膜材料的成膜透湿率、吸水率、透光率、透气性以及抑菌效果,研究纳米SiO2对其成膜包装效能特性的影响。结果表明:纳米SiO2改性PVA基复合膜的透湿率(18.78g/(m2.d))比未改性PVA基复合膜(27.39g/(m2.d))降低31.43%,吸水率(1.40%)降低了35.34%,透O2率(0.055g/(m2.d)和透CO2率(0.174g/(m2.d))分别降低了17.91%和18.31%,且复合膜的抑菌性能也得到提高。纳米SiO2改性可显著提高PVA基纳复合涂膜材料的阻隔性,尤其是阻湿阻水性等成膜包装效能特性,改善其食品保鲜包装的应用效果。

Effect of PVA-Based Coating Material Modified by Nano-SiO2 on Properties of Film-forming Package

Due to the hydrophilic property,the application of poly vinyl alcohol(PVA) in food package is greatly limited.In this paper,the effect of PVA-based composite film modified by adding nano-SiO2 on packaging efficacy was evaluated by measuring vapor transmission rate,water-absorbing rate,transmittance,gas permeability and antibacterial capability.The results showed that vapor transmission rate(18.78 g/(m2·d)),water-absorbing rate(1.40%) of modified composite film decreased by 35.34%;O2 and CO2 penetration(0.055 g/(m2·d) and 0.174 g/(m2·d)) of modified composite film decreased by 17.91% and 18.31%,respectively,compared with those of PVA-based composite film without modification.Moreover,the antibacterial capability of PVA-based composite film was also improved after the modification with nano-SiO2.Therefore,modification with nano-SiO2 can significantly enhance the barrier performance,especially vapor barrier performance of PVA-based composite film,and consequently improve the application efficiency in food package.