Sometimes flame retardant materials have the same importance as drug rescue. Flame retardant materials can avoid or reduce the occurrence of disasters. Due to the use of flame retardants in Europe in the last ten years, the number of fire fatalities has decreased by about 20%. The safety of the flame retardant material itself is also very important. In the industry, it is a slow and difficult process to regulate the type of material used. At present, the European Community has been and is harming many halogen and halogen-phosphorus flame retardants. Evaluation, many of which will be completed between 2004 and 2006.
At present, my country generally uses chlorine-containing or bromine-containing diols or dibasic acid halogen substitutes as raw materials to prepare reactive flame retardant resins. Halogen flame retardant will produce a lot of smoke when burning, accompanied by the formation of highly irritating hydrogen halide. This dense smoke and poisonous mist generated during the combustion process causes great harm to people. According to statistics, more than 80% of deaths in fire accidents are caused by this. Another disadvantage of using bromine or chlorine as a flame retardant is that it will also produce corrosive and environmentally polluting gases when it burns, which will cause damage to the original electrical appliances. Using inorganic flame retardants such as hydrated alumina, magnesium, boron, molybdenum compounds and other flame retardant additives, although it has obvious smoke elimination effect, it can produce low smoke low toxicity flame retardant resin, but if the amount of inorganic flame retardant filler is too large, Not only the viscosity of the resin increases, but it is not conducive to construction. At the same time, when a large amount of added flame retardant is added to the resin, it will affect the mechanical strength and electrical properties of the resin after curing.
At present, many foreign patents report the use of phosphorus flame retardants to produce low-toxic, low-smoke flame retardant resin technology. Phosphorus-based flame retardant has a relatively large flame retardant effect. Metaphosphoric acid generated during combustion can be polymerized into a stable polymeric state, forming a protective layer, covering the surface of the burned material, isolating oxygen, promoting dehydration and carbonization of the resin surface, and forming a carbonized protective film Thereby preventing burning. At the same time, phosphorus flame retardants can also be used in conjunction with halogen flame retardants, which has a very obvious synergistic effect.
Of course, the future research direction of flame retardant resins is low smoke, low toxicity and low cost. The ideal resin is a flame-retardant resin that is smoke-free, low-toxic, low-cost, does not affect the inherent physical properties of the resin, does not need to add additional materials, and can be directly produced in the resin production plant.