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Lignin-Containing Coatings for Packaging Materials-Pilot Trials.

Asif Javed¹, Peter Rättö^1,2, Lars Järnström¹

¹Department of Engineering and Chemical Sciences, Karlstad University, SE-651 88 Karlstad, Sweden.

|June 2, 2021

Summary

Adding kraft lignin to starch coatings reduces water solubility. Lowering pH decreases lignin migration, enhancing water stability in biopolymer packaging materials, though AZC addition increases defects.

Keywords:

barrier coatings glycerol lignin starch

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Area of Science:

Materials Science
Polymer Chemistry
Sustainable Packaging

Background:

Biopolymers used in packaging often suffer from high water solubility, limiting their application.
Kraft lignin addition to starch coatings can decrease starch's water solubility.
Lignin migration into aqueous solutions remains a concern for lignin-containing coatings.

Purpose of the Study:

To investigate the effect of pH on the solubility of LignoBoost kraft lignin.
To evaluate the impact of ammonium zirconium carbonate (AZC) on lignin solubility and coating properties.
To assess the water stability and defect formation in starch-lignin coated paper at varying pH levels.

Main Methods:

Kraft lignin isolated via the LignoBoost process was used.
Machine-glazed (MG) paper was coated using a pilot coating machine; lab samples served as reference.
Solubility, migration, water vapor transmission rate (WVTR), water contact angle, and pinhole defects were measured.

Main Results:

Kraft lignin solubility in water decreased at lower pH levels when starch was present, due to starch-lignin interactions.
Reduced pH of coating solutions increased water stability, decreasing lignin migration.
AZC addition reduced lignin migration and increased water contact angle but also increased pinholes in pilot-coated samples.

Conclusions:

Lowering the pH of starch-lignin coating solutions enhances water stability by reducing lignin migration.
AZC can improve water resistance but may negatively impact coating integrity (pinholes).
Optimizing pH and considering additives like AZC are crucial for developing water-resistant biopolymer packaging.