Journal
CHEMICAL ENGINEERING JOURNAL
Volume 440, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.135807
Keywords
Flame retardancy; Smoke suppression; Coating; Expandable polystyrene foam
Categories
Funding
- National Natural Science Foundation of China [51991351, U19A2045, 52122302, 51790504]
- Young Elite Scientists Sponsorship Program by CAST
- Fundamental Research Funds for the central Universities
Ask authors/readers for more resources
This article introduces a formaldehyde-free phosphorus-containing polysiloxane coating for flame retardancy of EPS foam. The coating acts as both an adhesive and a flame retardant, providing durable thermal insulation and forming a graphited char layer to isolate oxygen, heat, combustible compounds, and smoke particles during combustion. EPS composites treated with this coating exhibit high fire safety and excellent comprehensive performance.
Expandable polystyrene (EPS) foam, one of the most widely used thermal insulation of building materials, is highly flammable, while its traditional flame-retardant coating has been severely restricted by the low efficiency and the use of toxic formaldehyde adhesive. Herein, we demonstrate a formaldehyde-free phosphorus-containing polysiloxane coating that acts as both an adhesive and a flame retardant for EPS foams. In this design, on one hand, the high adhesion of the polysiloxane can evenly and tightly bind the EPS beads and expandable graphite (EG, a flame-retardant synergist filler) at a relatively low additive loading, thus leading to durable thermal insulation even under high humidity conditions. On the other hand, the functional coating can promote the formation of P/Si-containing graphited char layers during the combustion of the EPS composite, which can effectively isolate oxygen, heat, combustible compounds, and smoke particles. As a result, the EPS composite showed excellent flame retardancy with a high limiting oxygen index of 36%, a UL-94V-0 rating, and a significantly reduced peak heat release rate (-76%), while the smoke release can be greatly suppressed both in cone calorimetry and smoke density tests. This work provides a new strategy for the design of environmentally friendly coatings, which can give EPS foam high fire safety and excellent comprehensive performance.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available