Study on Efficient Degradation of Waste PU Foam

Area of Science:

• Materials Science
• Polymer Chemistry
• Sustainable Chemistry

Background:

• Polyurethane foam waste presents a significant environmental challenge.
• Effective recycling methods are crucial for sustainable material management.

Purpose of the Study:

• To develop an efficient method for degrading and recovering waste polyurethane foam.
• To prepare regenerated thermosetting polyurethane hard foam with desirable properties.

Main Methods:

• Utilized cesium hydroxide (CsOH) as a catalyst and a mixture of glycerol and butanediol as alcoholysis agents.
• Optimized reaction conditions including agent ratios, catalyst concentration, temperature, and time.
• Characterized the properties of the regenerated foam, including viscosity, GPC, hydroxyl value, and mechanical strength.

Main Results:

• Identified optimal alcoholysis conditions: glycerol:butanediol ratio of 3:2, 0.08% CsOH, 170°C for 2.5 hours.
• Successfully prepared regenerated polyurethane foam with an apparent density of 34.1 kg/m³ and compressive strength of 0.301 MPa.
• The regenerated foam exhibited good thermal stability, complete pores, and a strong skeletal structure.

Conclusions:

• The developed alcoholysis process provides an efficient route for recycling waste polyurethane foam.
• The regenerated polyurethane foam meets national standards and demonstrates viable material properties.
• This method offers a promising approach for sustainable polyurethane waste management.