阻燃剂DDPA的合成及在环氧树脂中的应用研究

一锅法合成了一种磷杂菲类阻燃剂2-((9,10-二氢-9-氧杂-10-磷杂菲-10-基)(苯基)甲基)氨基-9',10'-蒽醌(DDPA),采用红外光谱和核磁共振确定了阻燃剂DDPA的分子结构,并将其用于阻燃改性环氧树脂.通过悬臂梁冲击试验机、电子万能力学试验机、热重分析仪(TGA)、差示扫描量热仪(DSC)、氧指数仪...

SYNTHESIS OF THE FLAME DDPA AND ITS APPLICATION IN EPOXY RESIN

A new flame retardant based on phosphaphenanthrene, 2-(9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-yl) (phenyl) methyl) amino -9'',10''-anthraquinone (DDPA) was synthesized, and the chemical structure was confirmed by FTIR and NMR spectra, then it was used as the flame retardant to modify the epoxy resins. Thereafter, the effects of flame retardants on mechanical properties, thermal properties and flame retardancy of the modified epoxy resins were investigated by the electronic universal mechanical testing machine, cantilever impact testing machine, thermogravimetric analyzer (TGA), differential scanning calorimeter (DSC) and oxygen index meter (LOI), respectively. The results indicated that with the increase of the adding content of DDPA, the impact strength as well as Tg vavle of the DDPA modified epoxy resins decreased slightly, whereas, its tensile strength increased from 817 to 976 MPa and carbon residue increased from 0.5% to 7% at 800 oC in comparison with those of pure epoxy. Notably, when DDPA content increased to 6%, the oxygen index of EP increased gradually from 25.3% to 29.1%. Moreover, the UL-94 test revealed that the EP composites reached V-1 rank when the phosphorus content was only 0.4%.