The flame retardants of black masterbatch and black masterbatch mainly exert their flame-retardant effects through the gas phase and condensed phase. Color powder and fillers have little impact on its flame retardancy, but they are restricted by environmental protection. The flame-retardant mechanism of halogen-free phosphorus and nitrogen is that it expands into carbon, isolating oxygen and heat sources, thereby exerting its flame-retardant effect. Below, the black mother manufacturer will tell you the difficulties of flame-retardant black PP materials. As follows:
The main component of black masterbatch is carbon black. Carbon black itself is flammable, with a large specific surface area and numerous micro-pores on its surface, which can easily form spatial network channels and is not prone to damage. The existence of these micro-pores will affect the compactness of the flame-retardant carbon layer, preventing the carbon layer from playing a good isolation role.
Under the same carbon content, flame retardancy cannot achieve the desired effect. Eventually, the flame retardancy of black components is inferior to that of light-colored components. The greater the addition of black powder or black masterbatch, the more difficult it is to achieve flame retardancy. Blindly increasing the flame retardant dosage will deteriorate the material performance, making the material lose its good processing and usage, and also poses a great challenge to the cost of composite materials.
The differences in pp matrix, such as homopolymer pp or copolymer pp, result in variations in flame retardancy due to the different ethylene content within them. The flame retardancy of copolymer pp is more challenging than that of homopolymer pp, and accordingly, more flame retardants may need to be added.