Chemical method
Wood is mainly treated with chemical reagents, that is, flame retardants. The mechanism of flame retardant is to form a protective layer on the surface of wood to isolate or dilute oxygen supply; Or decompose at high temperature, releasing a large amount of non-combustible gas or water vapor, and diluting the combustible gas released during wood pyrolysis; Or delay the temperature rise of wood, making it difficult to reach the temperature required for pyrolysis; Or improve the forming ability of charcoal and reduce the heat transfer speed; Or cut off the burning chain and let the fire go out quickly. A good flame retardant is safe, effective, durable and economical.
According to the methods of flame retardant treatment, flame retardants can be divided into two categories: ① flame retardant impregnant. Wood was injected by whole cell method. It can also be divided into two categories: inorganic salts and organic substances. Inorganic salt flame retardants (including single agent and compound agent) mainly include diammonium phosphate [(NH) HPO], ammonium dihydrogen phosphate (NHHPO), ammonium chloride (NHCl), ammonium sulfate [(NH)SO], phosphoric acid (HPO), zinc chloride (ZnCl) and borax (NaBaO 10HO). Organic flame retardants (including polymers and resins) mainly include MDP flame retardants made of formaldehyde, melamine, dicyandiamide and phosphoric acid, and UDFP amino resin flame retardants made of urea, dicyandiamide, formaldehyde and phosphoric acid. In addition, a self-extinguishing flame retardant such as organic halogenated hydrocarbon is also under development. ② Flame retardant coating. Spraying on the wood surface. It is also divided into inorganic and organic: inorganic flame retardant coatings mainly include silicates and non-silicates. Organic fire retardant coatings are mainly divided into expansion type and non-expansion type. The former, such as tetrachlorophthalic anhydride alkyd resin fire retardant coating and acrylic latex fire retardant coating. The latter such as perchloroethylene and chlorophthalic anhydride alkyd resin.
physical method
A method of taking measures from wood structure. Mainly improve the structural design, or increase the cross-sectional size of the component to improve its flame retardancy; Or strengthen heat insulation measures to prevent wood from being directly exposed to high temperature or flame, such as wrapping and sealing components with incombustible materials, installing a firewall, or adding a fire baffle in the wood frame structure, and blocking the circulation of hot air by using a cross structure to prevent the flame from passing through and prevent or delay the temperature rise of wood. In industrialized countries, chemical methods play a major role in wood fire prevention or flame retardant treatment; In the past, China mainly adopted structural measures, and chemical methods also developed to a certain extent. With the increase of high-rise buildings and underground buildings, the development of aviation and marine transportation, the maintenance and protection of ancient buildings and cultural relics, and the application and improvement of wood fire-retardant treatment will become an urgent need.
The flame retardant ZRM produced by Beijing Shengda Huayuan Technology Co., Ltd. is a patent-protected flame retardant. One of its main uses is to produce B-and C-grade flame-retardant wood specified in GB8624-2006 "Classification of Combustion Performance of Building Materials and Products".
This product does not contain any other toxic and harmful substances.
ZRM flame retardant is developed according to the synergistic effect of phosphorus-nitrogen-carbon-boron-aluminum-titanium-sodium, and its functional group is closed. ZRM flame retardant not only has excellent flame retardant performance, but also can improve the mechanical properties of products, reduce the formaldehyde emission of products and avoid the pollution of free formaldehyde to the environment.