WATER-PROOF COATING FOR KRAFT-CARDBOARD FROM BIODEGRADABLE POLYMER
UDC 676.2:678.5
Abstract
In this article, a novel packaging material for agricultural products based on kraft-cardboard is proposed, featuring a barrier coating made from biodegradable agar-agar polymer. The optimal concentrations of aqueous agar-agar solutions for application on cardboard were selected. The rheological characteristics of the polymer solution were determined for concentrations of 1%, 2%, and 3%. It was found that with an increase in the concentration of the agar-agar solution, the surface absorbency, measured by the drop method, decreases due to the migration of a larger portion of the polymer macromolecules into the near-surface layers of the cardboard, resulting in reduced porosity of the material. The polymer coating also provides water-resistant functions, reducing the absorbency of kraft-cardboard by approximately 40% upon complete immersion, which is independent of the polymer solution concentration. An increase in the stiffness of the material was observed under bending loads with the increasing density of the agar-agar solution. The achieved results in enhancing the performance properties of kraft-cardboard demonstrated the high effectiveness of using agar-agar as a surface protective coating.
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