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PVA- Bentonite-Water Coatings: Experimental and Simulation Studies.

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  • 1Department of Chemical Engineering, Dr. B. R. Ambedkar National Institute of Technology, Jalandhar 144011, Punjab, India.

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Summary

Polyvinyl alcohol (PVA) coatings dry slower with higher PVA content. Adding bentonite filler accelerates drying in PVA-based coatings, aiding waterborne coating optimization.

Keywords:
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Area of Science:

  • Materials Science
  • Polymer Science
  • Chemical Engineering

Background:

  • Polyvinyl alcohol (PVA) and PVA-bentonite composites are used in waterborne coatings.
  • Understanding drying kinetics and film formation is crucial for optimizing coating performance.

Purpose of the Study:

  • To investigate the drying kinetics and film formation of PVA-based and PVA-bentonite composite coatings.
  • To analyze the influence of PVA concentration and bentonite filler on drying behavior.
  • To develop a model for simulating coating drying rates.

Main Methods:

  • Monitoring solid concentration, residual solvent content, and film thickness over time for four coating formulations.
  • Investigating coatings with initial thicknesses of approximately 2500 µm and 2000 µm.
  • Proposing a simple realistic model to simulate drying rate.

Main Results:

  • Higher PVA content led to slower drying rates due to shifts from evaporation-controlled to diffusion-limited mechanisms.
  • Bentonite incorporation enhanced drying speed, facilitating moisture transport.
  • Thinner coatings dried faster but showed similar drying mechanisms to thicker films.

Conclusions:

  • Formulation variables significantly impact drying behavior and final film properties of PVA-based coatings.
  • Bentonite acts as a beneficial filler, accelerating drying in composite coatings.
  • Findings provide guidance for optimizing waterborne coating design and industrial applications.