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Related Concept Videos

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Related Experiment Video

Updated: Jun 18, 2025

The Effect of Construction and Demolition Waste Plastic Fractions on Wood-Polymer Composite Properties
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High-Value and Environmentally Friendly Recycling Method for Coal-Based Solid Waste Based on Polyurethane Composite

Xu Li1, Yang Liu1, Mingyi Li1

  • 1College of Materials Science & Engineering, Taiyuan University of Technology, Taiyuan 030024, China.

Polymers
|July 27, 2024
PubMed
Summary
This summary is machine-generated.

This study developed modified fly ash/polyurethane (MFA/PU) and modified coal gangue powder/polyurethane (MCG/PU) composites from coal waste. MFA/PU composites showed superior compressive strength and flame retardancy, offering a safe recycling strategy.

Keywords:
coal ganguecomposite materialsfly ashpolyurethane

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Area of Science:

  • Materials Science
  • Environmental Science
  • Chemical Engineering

Background:

  • Coal-based solid waste, such as fly ash and coal gangue, presents disposal challenges.
  • Developing high-value applications for this waste is crucial for environmental sustainability.
  • Polyurethane composites offer versatile material properties for waste incorporation.

Purpose of the Study:

  • To create novel composite materials using modified fly ash (MFA) and modified coal gangue powder (MCG) with polyurethane (PU).
  • To evaluate the mechanical properties, flame retardancy, and environmental safety of these MFA/PU and MCG/PU composites.
  • To establish a high-value and environmentally friendly application for coal-based solid waste.

Main Methods:

  • Preparation of MFA/PU and MCG/PU composites with varying filler content (10-40%).
  • Mechanical testing (compressive strength) and flame retardancy analysis (limiting oxygen index, cone calorimetry).
  • Microstructural analysis using scanning electron microscopy (SEM) and water quality tests for heavy metal leaching.

Main Results:

  • Composites with 30% filler content exhibited optimal properties: MFA/PU (84.1 MPa compressive strength, 29% LOI) and MCG/PU (46.3 MPa compressive strength, 23.5% LOI).
  • SEM analysis indicated improved interface compatibility with increased filler content.
  • Both composites demonstrated condensed-phase flame retardancy, with MCG/PU forming a more stable barrier layer; no heavy metal leaching was detected.

Conclusions:

  • Modified fly ash and coal gangue powder can be effectively utilized in polyurethane composites.
  • MFA/PU composites offer superior mechanical and flame-retardant properties compared to MCG/PU.
  • This research presents a viable strategy for the safe and high-value recycling of coal-based solid waste into functional materials.