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Synthesis of a green reactive flame‐retardant polyether polyol and its application
Author(s) -
Li Xue,
Yu Zaiqian,
Zhang Long
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.50154
Subject(s) - fire retardant , limiting oxygen index , polyurethane , materials science , thermal stability , composite material , polyol , fourier transform infrared spectroscopy , polymerization , chemical engineering , polymer , pyrolysis , char , engineering
Abstract The low‐flame retardancy properties of pure rigid polyurethane (PU) foams hindered its practical application in many cases for the safety and environmental concern. Although rigid PU foams with flame retardants can achieve standard of fire resistance, addition of flame retardants in PU can worsen its mechanical properties, enlarge production cost, and induce safety problems. Therefore, green reactive flame‐retardant polyether polyols (GPP) have been considered as one of the best solutions. In this work, the GPP by the ring‐opening polymerization of the self‐made environmentally friendly melamine resin (EFMR) with propylene oxide are synthesized with their hydroxyl number of 390 ~ 420 mg KOH/g, and the structure of GPP product was identified by Fourier transform infrared spectroscopy and nuclear magnetic resonance. The flame‐retardant rigid polyurethane foams (RPUFs) were successfully prepared with GPP as the polyol, the results showed that the addition of GPP can greatly improve the thermal stability and flame retardancy of the RPUFs prepared. The RPUF were prepared by fully GPP with 30.4% of limiting oxygen index and 350 kpa of compressive strength. These properties are qualified for commercial utilization. Therefore, this GPP provides great prospect in the development of specified flame‐retardant PU materials.