摘要
以三氯氧磷与二氨基二苯甲烷(DDM)为原料,三乙胺兼为催化剂和缚酸剂,采用一步法合成了一种新型的膨胀型阻燃剂——超支化聚磷酰胺(HBPPA),并对其化学结构与热稳定性进行了表征;将HBPPA与聚磷酸铵(APP)复配后,经熔融共混制备了一系列聚丙烯(PP)阻燃复合材料,并对其阻燃性能、热稳定性及热降解过程进行了研究。结果表明,当HBPPA与APP的质量比为2∶1,总添加量为30%(质量比,下同)时,PP阻燃复合材料的极限氧指数最高可达28.2%,垂直燃烧为UL 94 V-0级;HBPPA与APP复合时形成的残炭最为致密、坚固,既可有效防止内部气流的冲击而破裂,又可阻隔外部氧气与内部可燃性气体的交换,阻止热量传递,阻燃协同效果较好。
A novel intumescent flame retardant,hyperbranched polyphosphoramide(HBPPA),was synthesized by using phosphorus oxychloride and diaminodiphenylmethane as raw materials and triethylamine both as a catalyst and as an acid-binding agent,and its chemical structure and thermal stability were characterized.A series of flame-retardant polypropylene(PP)-based composites were prepared by melt blending with HBPPA and ammonium polyphosphate(APP),and their flame-retardant performance,thermal stability,char morphology and pyrolysis properties were analyzed.The results indicated the composite containing 30 wt%HBPPA and APP at the mass ratio of 2∶1 presented the highest limiting oxygen index of 28.2%and achieved a UL 94 V-0 classification in the vertical burning test.Such good flame-retardant performance may ascribed to a synergistic effect between HBPPA and APP,which facilitates to form a compact and continuous char layer to inhibit the impact of degraded gaseous and also to act as a physical barrier to hinder the exchange of external oxygen and internal flammable volatile gases and the heat transmission.
作者
胡晋
陈小随
彭凡畅
张爱清
HU Jin;CHEN Xiaosui;PENG Fanchang;ZHANG Aiqing(College of Chemistry&Materials Science,South‐central University for Nationalties,Wuhan 430074,China)
出处
《中国塑料》
CAS
CSCD
北大核心
2020年第2期16-22,共7页
China Plastics
基金
青年科学基金项目(51703249)
关键词
聚磷酸铵
超支化聚磷酰胺
聚丙烯
阻燃
ammonium polyphosphate
hyperbranched polyphosphoramide
polypropylene
flame retardancy
