Journal
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
Volume 125, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2019.105534
Keywords
Foams; Flame retardancy; Surface analysis; Surface treatments
Funding
- National Natural Science Foundation of China [21704111]
- National Key Research and Development Program of China [2018YFC0809005]
- Science and Technology Program of Guangzhou [201806010113]
- China Scholarship Council [201706155049]
- Fundamental Research Funds for the Central Universities [2018MS43]
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Nowadays, halogen-free high flame retardance of rigid polyurethane (RPU) foam without deteriorating its intrinsic performances is still a great challenge. Here, a green surface flame-retardant (SFR) strategy of RPU foam was proposed. In detail, a new halogen-free UV-curable self-extinguished coating was developed and then combined onto the surface of RPU, obtaining a surface flame-retardant RPU foam system (SFR-RPU). The SFR-RPU foams exhibit highly-efficient flame retardancy at a coating thickness of 25 mu m, showing a fast self-extinguishing behavior. A compact porous char layer served as a good barrier can be rapidly formed on the surface of SFR-RPU. The detailed flame-retardant mechanism was proposed. Furthermore, when compared to neat RPU, the compressive strength of SFR-RPU foams is enhanced and the heat-insulation property is maintained perfectly. This facile, low-cost and environmental-friendly post-treatment of RPU foam could expand its fire safe commercial applications.
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