Three-Dimensional Cross-Linking Network Coating for the Flame Retardant of Bio-Based Polyamide 56 Fabric by Weak...

Area of Science:

• Materials Science
• Polymer Chemistry
• Textile Finishing

Background:

• Weak bonds are typically used to enhance polymer mechanical strength, but their application in flame retardants is underexplored.
• Developing effective, durable, and environmentally friendly flame retardants for bio-based textiles remains a significant challenge.

Purpose of the Study:

• To investigate the use of weak bonds in creating a flame-retardant coating for bio-based polyamide 56 (PA56) fabrics.
• To develop a simple, cost-effective, and eco-friendly flame-retardant system utilizing a polyelectrolyte complex.

Main Methods:

• A water-soluble polyelectrolyte complex of polyethyleneimine (PEI), sodium tripolyphosphate (STPP), and melamine (MEL) was synthesized.
• PA56 fabrics were treated using a three-step process to apply the complex, forming a cross-linked network structure.
• The thermal stability, flame retardancy, and mechanical properties of the treated fabrics were evaluated, including wash durability.

Main Results:

• A 3D cross-linked network structure with MEL on the surface was formed under mild conditions.
• Treated PA56 fabrics exhibited improved thermal stability and flame retardancy without loss of mechanical properties.
• The flame retardancy remained effective even after 50 washing cycles, demonstrating excellent durability.

Conclusions:

• The developed flame-retardant coating, utilizing weak bonds within a PEI-STPP-MEL complex, offers a novel strategy for enhancing bio-based polyamide fabric performance.
• The synergistic action of STPP, PEI, and MEL contributes to improved thermal stability and flame retardancy through specific mechanisms.
• This approach provides a low-cost, environmentally friendly, and durable flame-retardant solution for textiles.