Since the intrinsic flame retardant materials do not need further flame retardant treatment, the following contents are aimed at additive flame retardant materials. Flammable materials can generally include thermoplastic resin, thermosetting resin, rubber, coating, fiber (natural fiber and artificial fiber), wood, etc. The above flammable materials can be modified into flame retardant materials in the following ways.

(1) Thermoplastic resin thermoplastic polyester resin includes common polyolefin, polyester and polyamide, such as polyethylene, polypropylene, polystyrene, ABS (acrylonitrile butadiene styrene copolymer), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), nylon 6 and nylon 66. For the above materials, the flame retardant particles were prepared by melt blending and extrusion granulation with corresponding flame retardant additives in screw extruder to complete the flame retardant modification. However, the flame retardant additives are usually targeted, that is, a specific flame retardant acts on a certain kind of resin. There are few kinds of flame retardants that can be widely used, so they usually need to be carefully selected, tested and applied in combination.

(2) Thermosetting resin thermosetting resin includes epoxy resin, phenolic resin, polyurethane, unsaturated polyester resin and so on. This kind of resin needs multi-component blending in application, so the flame retardant can be added at the same time and mixed evenly by rapid stirring. After mixing, curing reaction is carried out at a certain temperature. After curing, the thermosetting resin with flame retardant property can be formed.

(3) Rubber can be used as wire and cable material, conveyor belt material, etc. the flame retardant requirement is very high. Flame retardant rubber is prepared by blending raw rubber, flame retardant and various additives, plasticizing, blending and vulcanizing.

(4) The coating is also made of many components. Therefore, when used, the flame retardant and its composite components are usually mixed with the components of the coating to form a coating, which is then coated on the surface of steel structure or wood structure to form a flame retardant coating.

(5) Fibers include chemically made fibers such as polyester, polypropylene, acrylic, spandex, and natural fibers such as cotton and silk fabrics. Chemical fibers can be spun with flame retardant pellets before being made into fibers. The fiber has flame retardant function. In addition, flame retardant functionalization can also be achieved by finishing fibers and fabrics. When the fiber fabric is dipped in the flame retardant finishing solution, the flame retardant components can be reactive and 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 the fiber. However, due to the weak binding force between the flame retardant components and the fiber, the water washing resistance of the physically adhered flame retardant components is poor. As a result, the fiber lost its flame retardant function after repeated washing.

(6) Wood and wood are flammable materials. However, as a natural material, it has the characteristics of environmental protection, regeneration and biodegradation. Impregnation method is usually used for wood fire retardant. That is, through high negative pressure, the gap 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 enter the interior of the wood under pressure, and then the flame-retardant wood material is formed after drying.