Chan Yin Yam, Schartel Bernhard
Bundesanstalt für Materialforschung und-prüfung (BAM), Unter den Eichen 87, 12205 Berlin, Germany.
Polymers (Basel). 2022 Jun 23;14(13):2562. doi: 10.3390/polym14132562.
Due to the high flammability and smoke toxicity of polyurethane foams (PUFs) during burning, distinct efficient combinations of flame retardants are demanded to improve the fire safety of PUFs in practical applications. This feature article focuses on one of the most impressive halogen-free combinations in PUFs: expandable graphite (EG) and phosphorus-based flame retardants (P-FRs). The synergistic effect of EG and P-FRs mainly superimposes the two modes of action, charring and maintaining a thermally insulating residue morphology, to bring effective flame retardancy to PUFs. Specific interactions between EG and P-FRs, including the agglutination of the fire residue consisting of expanded-graphite worms, yields an outstanding synergistic effect, making this approach the latest champion to fulfill the demanding requirements for flame-retarded PUFs. Current and future topics such as the increasing use of renewable feedstock are also discussed in this article.
由于聚氨酯泡沫(PUFs)在燃烧过程中具有高易燃性和烟雾毒性,因此在实际应用中需要不同的高效阻燃剂组合来提高PUFs的消防安全性能。这篇专题文章聚焦于PUFs中最引人注目的无卤组合之一:可膨胀石墨(EG)和磷基阻燃剂(P-FRs)。EG和P-FRs的协同效应主要叠加了两种作用模式,即炭化和保持隔热残余物形态,从而为PUFs带来有效的阻燃性。EG和P-FRs之间的特定相互作用,包括由膨胀石墨蠕虫组成的火灾残余物的凝集,产生了显著的协同效应,使这种方法成为满足阻燃PUFs苛刻要求的最新佼佼者。本文还讨论了当前和未来的一些话题,如可再生原料使用的增加。