Film-forming Properties of the Blend Films and Effect on the InhibitingActivity of Biocontrol Bacteria

The blend films of polyvinyl alcohol-carboxymethyl cellulose-Na-bentonite (PVA-SCMC-Na-B )with different blending ratios were prepared.The results showed that the film-forming time of forming film,viscosity,coating homogeneity,coating abscission rate were 7 min,480 mPa · s,98%,0.15%,respectively,and the film had a biggish swelling capacity and good solubility when the blending ratio were 2% PVA ,1% SCMC and 0.3% Na-B.In addition,the PVA - SCMC-Na-B blend film has good properties and has no influence on the germination rate of cotton seed and the growth and inhibiting activity of microorganism,which provided the theoretical foundation for the application of biological seed coating agent.