Improvement of Flame Retardant Properties of Polyurethane Composites Using Microencapsulation Technology

ABSTRACT

One kind of microencapsulated flame retardant containing melamine polyphosphate(MPP) and hydrophobic resin layer as core and shell material was synthesized by in situ polymerization technology. The structures and properties of microencapsulated MPP were characterized by Fourier transform infrared spectroscopy, scanning electron microscopy and water contact angle. Thermal behaviors of the composites containing microencapsulated MPP were analyzed by thermogravimetric analysis. Flame retardant tests indicated that the microencapsulated MPP with the polymer resin led to an improvement of the hydrophobicity. Results revealed that the flame retardancy of the composites was improved at the same fillers loading through the microencapsulation technology, which the char yields reached (~26.9wt%) and flame retardance grade (LOI-38%) with optimized MPP addition (~40%) to polymer matrix.

GRAPHICAL ABSTRACT

KEYWORDS:

• Composite
• flame retardant
• melamine polyphosphate
• microencapsulation
• polyurethane

Acknowledgments

The authors would like to express their appreciation to the Ministry of Science and Technology of the Republic of China for financial support of this study under grant MOST-105-2221-E-241-001-MY3

Additional information

Funding

This work was supported by the Ministry of Science and Technology of the Republic of China [MOST-105-2221-E-241-001-MY3].