Recycling Waste Circuit Board Efficiently and Environmentally Friendly through Small-Molecule Assisted Dissolution

Area of Science:

• Materials Science
• Environmental Science
• Chemical Engineering

Background:

• Electronic waste (e-waste) recycling presents significant environmental and efficiency challenges.
• Conventional printed circuit board (PCB) recycling methods often require high temperatures (>200°C) and pressures, limiting their effectiveness and environmental friendliness.

Purpose of the Study:

• To develop an efficient and environmentally friendly method for recycling printed circuit boards (PCBs).
• To investigate a novel small-molecule assisted approach for dissolving thermosetting polymers in PCBs.

Main Methods:

• A dynamic reaction-based approach utilizing small molecules to dissolve thermosetting polymers containing ester groups.
• The process operates at temperatures below 200°C for rapid polymer dissolution.

Main Results:

• The method successfully dissolved a wide range of commercial PCBs, including those with anhydride epoxy or polyester substrates.
• The recycling process is environmentally friendly, with the solution reusable multiple times.
• The spent recycling solution demonstrated utility in board bonding and damage repair.

Conclusions:

• Small-molecule assisted dynamic reactions offer an effective, low-temperature solution for PCB recycling.
• Polymers with ester groups are advantageous for PCB substrates due to their eco-friendly and efficient recyclability.
• This approach enhances e-waste management and promotes a circular economy in electronics manufacturing.