The effect of polyvinyl alcohol content on the heat-seal performance of soy protein isolate paper coating was studied. The coating liquid was prepared to coat the paper and the heat-sealing performance of the blend coating was evaluated through the differential scanning calorimetry test and the heat seal strength test. The results showed that when the mass ratio of soy protein isolate and polyvinyl alcohol is 1∶1, the melting temperature of the coating was significantly reduced. When the heat-sealing temperature was 180 °C, the heat-sealing effect was the best, and the paper substrate was uniformly torn. The effect of stearic acid mass fraction (2%, 4%, 6%, 8%, 10%) on the waterproof performance of soy protein isolate coating was also studied. Through a grafting reaction, stearic acid was grafted onto soy protein isolate. Through attenuated total reflection-Fourier transform infrared spectroscopy, it was proved that stearic acid was successfully grafted onto soy protein isolate. The waterproof performance of the coating was evaluated by Cobb value, water vapor permeability and contact angle. The results showed that when the mass fraction of stearic acid was 6%, the Cobb value decreased by 56.6%, the water vapor permeability decreased by 42.32%, and the contact angle was also significantly increased, from 46° to 87°.
SUN Lingzhi
,
LU Lixin
,
LU Lijing
,
PAN Liao
. Heat-seal and waterproof performance improvement modification of bio-based soy protein isolate paper coating[J]. Food and Fermentation Industries, 2022
, 48(23)
: 143
-148
.
DOI: 10.13995/j.cnki.11-1802/ts.030081
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