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Since the intrinsic flame retardant material does not require further flame retardant treatment, the following are all directed to additive flame retardant materials. The combustible material may generally include thermoplastic resins, thermosetting resins, rubbers, paints, fibers (natural fibers and artificial fibers), wood, and the like. The above-mentioned flammable material can be modified into a flame retardant material in the following manner.

(1) Thermoplastic Resin The thermoplastic polyester resin includes common polyolefins, polyesters, polyamides and the like, such as polyethylene, polypropylene, polystyrene, ABS (acrylonitrile-butadiene-styrene copolymer), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycarbonate (PC), nylon 6, nylon 66 and the like. For the above materials, the corresponding flame retardant additives are extruded and granulated by melt blending in a screw extruder to make flame retardant pellets, and the flame retardant modification is completed. However, flame retardant additives are usually targeted, that is, specific flame retardants act on a certain variety of resins. There are few types of flame retardants that can be widely used, so they usually need to be carefully selected, experimented and compounded.

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

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

(4) Coatings Coatings are also blended from a variety of components. Therefore, when in use, the flame retardant and its composite components are usually mixed with the components forming the coating by stirring to form a coating, and then coated on the surface of the material such as steel structure or wood structure to form a flame retardant coating.

(5) Fibers include chemically manufactured fibers such as polyester, polypropylene, acrylic, spandex, etc., as well as natural fibers such as cotton and silk fabrics. The chemical fibers may be spun from flame retardant pellets having flame retardant properties before being made into fibers. The resulting fiber has a flame retardant function. In addition to this, flame retardant functionalization can also be accomplished by post-finishing of fibers and fabrics. The fiber fabric is impregnated in a flame retardant finishing solution, wherein the flame retardant component may be reactive and react with the functional groups on the fiber to bond the flame retardant structure to the fiber. The flame retardant component may also be physically adhered to the 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. As a result, the fiber loses its flame retardant function after multiple washes.

(6) Wood Wood is a flammable material. However, as a natural material, it has the characteristics of environmental protection, renewable and biodegradable. Flame retardant wood is usually impregnated. 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 composition is pressurized to enter the wood, and the flame retardant wood material is formed after drying.