Does PA6 glass fiber reinforced need flame retardant
PA6 glass fiber reinforced composite material uses glass fiber as a filler, which does not improve the flame resistance of the composite material because of the high flame retardant properties of glass fiber. Easier to burn.
The wick effect of PA6 glass fiber reinforced material
The so-called "candle wick" effect means that the candle needs a wick to burn. It originated from the research and explanation of the "spontaneous combustion" of the human body in academia.
The PA6 material contains amide bonds, which is flammable. When ignited, it melts into droplets and then ignites. The flame is yellow and emits a paste smell similar to that of wool and nails. After the PA6 glass fiber reinforced material is ignited, the resin matrix is first melted, and the filled glass fiber is like the wick of a candlestick. The nearby melted PA6 melt is transported to the flame with the highest temperature to be gasified, which accelerates the cycle of combustion. Therefore, the flame retardancy of PA6 glass fiber reinforced materials is worse than that of pure PA6, especially PA6 reinforced with long glass fibers is more flammable. Traditional flame retardants, such as brominated polystyrene and brominated epoxy resins, can be used for flame retardant treatment of glass fiber reinforced PA6, but the application of such flame retardants is increasingly restricted due to the toxicity of halogen after combustion. , New halogen-free flame retardants, melamine cyanurate, melamine polyphosphate, organic hypophosphite, etc., and their compounding systems are increasingly widely used. In particular, the aluminum diethylphosphinate in organic hypophosphite has high phosphorus content and high thermal stability, and it is showing an increasingly broad application prospect in glass fiber reinforced PA6.