Since the inherent flame retardant material does not require further flame retardant treatment, the following are all directed to the additive flame retardant material. Flammable materials can generally include thermoplastic resins, thermosetting resins, rubbers, paints, fibers (natural and artificial fibers), wood, and the like. The above flammable materials can be modified into flame retardant materials by the following methods.

　　(1) Thermoplastic resin Thermoplastic polyester resins include common polyolefins, polyesters, polyamides, etc., such as polyethylene, polypropylene, polystyrene, ABS (acrylonitrile-butadiene styrene copolymer), poly-p-phenylene Ethylene glycol dicarboxylate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), nylon 6 and nylon 66, etc. For the above materials, they are granulated by melt blending with corresponding flame retardant additives in a screw extruder to make flame retardant pellets, and complete the flame retardant modification. But usually flame retardant additives are targeted, that is, specific flame retardants act on a variety of resins. There are fewer types of flame retardants that can be widely used, so they usually need to be carefully selected, tested and compounded.

　　(2) Thermosetting resin Thermosetting resin includes epoxy resin, phenol resin, polyurethane, unsaturated polyester resin and the like. This type of resin requires multi-component blending in application, therefore. The flame retardant can be added at the same time and mixed evenly by rapid stirring. After the mixing is completed, a curing reaction is performed at a certain temperature, and after curing, a thermosetting resin material with flame retardant properties can be formed.

　　(3) Rubber rubber can be used as wire and cable materials, conveyor belt materials, etc. Flame retardant requirements are high. Flame retardant rubber is prepared by blending raw rubber, flame retardant and various additives, then plasticizing, blending, and vulcanizing to prepare flame retardant rubber material.

　　(4) Paint Coating is also made by blending various components. Therefore, when in use, usually the flame retardant and its composite components and the components forming the coating are blended to form the coating, and then coated on the surface of the steel structure or the wooden structure to form a flame retardant coating.

　　(5) Fibers include chemically manufactured fibers such as polyester, polypropylene, acrylic, spandex, etc. There are also natural fibers such as cotton fabrics and silk fabrics. Chemical fibers can be spun using flame retardant pellets with flame retardant properties before they are made into fibers. The resulting fiber has a flame retardant function. In addition to this, flame retardant functionalization can also be accomplished through the finishing of fibers and fabrics. The fiber fabric is impregnated in the flame retardant finishing solution, where the flame retardant component can be reactive, react with the functional groups on the fiber to bond the flame retardant structure to the fiber, and the flame retardant component can also be physically adhered to Fiber. However, the physically adhered flame retardant component has poor water washing resistance due to the weak binding force between the flame retardant component and the fiber. Causes the fiber to lose its flame retardant function after multiple washings.

　　(6) Wood Wood is a flammable material. However, as a naturally-occurring material, it also has environmental protection, renewable, biodegradable and other characteristics. The flame retardancy of wood is usually immersed. That is, through high negative pressure, the gaps in the wood and the air in the fiber pipe are extracted, and then the wood is immersed in the flame retardant liquid, and the flame retardant components are pressed into the wood to form a flame retardant wood material after drying.