Effect of aluminum diethylphosphinate and its synergist on flame-retardant effects of epoxy resin

In this article, the flame-retardant epoxy resin (EP) material was prepared by aluminum diethylphosphinate (ADP), melamine (MEL) and pentaerythritol (PER). The data showed that when ADP was only 15%, the limiting oxygen index (LOI) was 29.5%, the material passed UL-94 V-0 rating, and there was no dripping phenomenon. In the thermogravimetric test, the residual amount reached 13.10%. When the total amount of flame retardant added was 10%, the EP-4 compound system and the EP-5 compound system have an excellent flame-retardant effect, indicating that ADP, MEL and PER have good synergistic flame-retardant effect. The average effective heat of combustion (AV-EHC) of the EP-5 complex system was 27.35 MJ kg−1, and the total smoke production (TSP) generated was 24.4 m2. The TSP of EP-5 is the smallest among all samples, and the carbon layer height was up to 32.7 mm. In the presence of PER, not only the total amount of flame retardant is reduced, but also has a good flame-retardant effect, which can promote the sample to be carbonized and effectively inhibit the generation of smoke.