Preparation of three-dimensional modified boron nitride and its effect on the flame-retardant performance and thermal conductivity of silicone rubber

In order to make strides the fire retardancy and warm conductivity of silicone rubber (VMQ), a simple synthesis process was used to grow β -FeOOH on the surface of Boron nitride (BN) to form a three-dimensional structure. The structure and morphology of the BN- β -FeOOH hybrid were systematically characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM), which proved the successful preparation of the hybrid BN- β -FeOOH. BN- β -FeOOH were added to VMQ to think about their impact on the warm solidness, combustion and warm conductivity of VMQ. Experimental results showed that the limiting oxygen index (LOI) of VMQ with three parts of BN- β -FeOOH increased to 29.8%, and the peak heat release rate (pHRR) and total heat release (THR) decreased by 34.5 and 30.2%. The flame-retardant performance of VMQ was significantly improved, and the emission of smoke was significantly reduced. At the same time, the thermal conductivity of the VMQ added with BN- β -FeOOH was also significantly improved. The improvement of its flame-retardant performance was due mainly to the physical barrier of boron nitride and the catalytic carbonization of β -FeOOH. In addition, the three-dimensional well-connected thermal conductivity network constructed by BN- β -FeOOH effectively improved the thermal conductivity of VMQ.