Since most polymers are highly flammable materials, flame retardant treatment is required in many applications. Currently, the commonly used flame retardants for polymers are halogen-based flame retardants (compounds containing C1 and Br), which have good flame retardant effects but release a large amount of smoke and toxic gases during combustion, causing 'secondary disasters'. Their application is greatly limited. In today's increasingly important safety and environmental protection context, flame retardants are developing towards high efficiency, low toxicity, and low smoke. It is very important to vigorously develop phosphorus and nitrogen-based flame retardants with excellent performance. Through years of research, we have developed composite flame retardants with phosphorus and nitrogen elements as the main core components, which can be applied to products such as plastics, rubber, wires and cables, coatings, paints, wood, etc. The equipment required for the project, such as reactors, filtration equipment, drying equipment, crushing equipment, Related test instruments, etc.