Abstract:

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 nano-
SiO2, 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.

Key words: poly vinyl alcohol (PVA), liquid paraffin, nano-SiO2, nano-TiO2, coating-packaging material, water vapor transmission