The flame retardancy of epoxy resin including the modified graphene oxide and ammonium polyphosphate

ABSTRACT

A modified graphene oxide (MGO) was prepared by graphene oxide, boric acid, and 3-aminopropyltriethoxysilane in an ethanol aqueous solution using ultrasonic agitation. Its structure was characterized by the Fourier transform infrared Fourier transform infrared, X-ray diffraction, and elemental analysis. Subsequently, MGO as a synergist, accompanied with ammonium polyphosphate (APP), was incorporated into epoxy resins (EP) to improve its mechanical properties and flame retardancy. The flame retardancy of EP/APP/MGO nanocomposites was investigated by the limiting oxygen index (LOI) test, the UL 94 test and the cone calorimeter test (CCT). The LOI value of EP/APP/MGO nanocomposites reached 28.8% by addition of 15 wt% of flame retardant, and its UL 94 test reached V-0 rating. The CCT results revealed that MGO could significantly enhance flame retardant properties of EP/APP/MGO nanocomposites because of the denser structure of char residue. Here, MGO also enhanced the mechanical properties of EP.

KEYWORDS:

• Graphene Oxide
• Ammonium Polyphosphate
• Epoxy Resins
• Flame Retardant
• Mechanical Properties

Additional information

Funding

This work was supported by the fundamental research funds for the Central Universities (3142017065), Hebei Provincial Science and Technology Program project (17211225) and the open fund of Key Laboratory of Mine Disaster Prevention and Control in Hebei Province (KJZH2017K12).