Ordinary rubber in the fire will generally be completely burned, in order to flame retardant self-extinguishing, the current technology mainly uses halogen-free low-smoke flame retardant rubber, mainly silicone rubber, ethylene-propylene rubber and ethylene - vinyl acetate rubber (EVM), these rubber in the fire combustion has flame retardant and self-extinguishing, in the fire a certain role. However, after continuous high temperature combustion, the burnt residue has no mechanical strength, becomes ash, and cannot maintain the integrity of the product, which will cause more dangerous secondary disasters, such as the cable, battery sheath and insulation after burning, resulting in short circuit.
As a new type of fireproof material, ceramicized flame retardant silicone rubber has the same properties as ordinary rubber materials at room temperature, and can form a dense and hard ceramic layer at high temperature, which can hinder the further spread of the flame and play a better protective role in the fire. Ceramicized flame retardant silicone rubber is a kind of material made by mixing the resin as the matrix, adding the appropriate proportion of high + low melting point porcelain powder and other additives. This material has the characteristics of plasticity + softness of commonly used polymer composite materials at room temperature, and can be quickly ceramicized to form ceramic ceramics with certain strength and self-supporting ability at high temperature. Fire safety is a new solution.
Mechanism of ceramicized flame retardant silicone rubber：
When silicone rubber is burned at high temperatures, it cracks and decomposes to form silicon dioxide. Because the silica has no bonding ability, after adding the appropriate silicate refractory filler in powder form, the silica generated by the decomposition of silicone rubber reacts with the refractory filler, forming a "low eutectic mixture" at the edge of the filler. The eutectic material acts as a bridge between the silica particles and the filler particles, thus curing them at the ignition temperature and forming a condensed ceramide when cooled. The ceramic body is self-supporting and can withstand certain mechanical shock and vibration.
Application prospect of ceramicized flame retardant silicone rubber：
At present, most of the product directions are cable and new energy batteries. At the same time, it also has great application value in building fire protection and daily rubber and plastic application scenarios with fire protection requirements (such as rubber and plastic parts in vehicles).