Halogen-free flame retardants

Flame retardants are a class of plastics and other polymer materials can prevent or inhibit flame is ignited additives. The early 1950s, Hooker Chemical Company with a reactive monomer chlorine acid bacteria developed flame-retardant unsaturated polyester, this research work has opened up new avenues flame area, followed by a new phosphorus-containing reactive bromine and resistance Burning monomer emerging. 60 years have developed a variety of suitable thermoplastic filler-type flame retardant, most of bromine. organic pigments
In the early 1970s to the mid-1980s, production and application of these flame retardants flourish. Since 1986, carried out within the field of fire-retardant PBDE flame retardants controversy toxicity and environmental issues, and promote the new type of decaBDE alternatives (including intumescent flame retardant and halogen-free resistance flame retardants) in research and development. However, with the increasing demand for flame retardant and awareness of environmental protection, non-halogenated flame retardants, smoke suppression and attenuated flame retardants have become current and future frontiers of research topics. How to develop better performance, better, more environmentally friendly new flame retardant? Abroad in this field has been carried out extensive research work. The 21st century will certainly be new flame retardant halogen-free, efficient, low smoke, low toxicity, multifunctional composite flame retardant.
Currently, the most representative of the halogen-free flame retardant inorganic metal compounds are aluminum hydroxide (ATH) and magnesium hydroxide (MDH). ATH flame retardant, smoke, filling three features, coupled with its non-volatile, non-toxic, but also with a variety of substances produced synergistic effect, so its usage has maintained a high growth rate, and its flame retardant The total volume has been maintained at 40% of the ratio. However, ATH is usually necessary to add more than 50% in order to show good flame-retardant effect. Metal soap
To overcome this drawback, on the one hand can be improved granulation technology, the ultrafine direction, the narrower the particle size distribution; other hand, the surface of its particles, the use of a silane coupling agent, a wax, titanate esters, stearic acid salts and organic silicon to enhance its mechanical strength, in addition also be used to improve coating techniques and methods with the macromolecules bonding methods to improve its performance. ATH flame retardant mechanism is: (1) adding to the polymer ATH, reducing the concentration of combustible polymer; (2) beginning at about 250 ℃ dehydration, heat, the temperature rise suppression polymer; (3) decomposition of the dilution of the water vapor concentration of combustible gas and oxygen, to prevent combustion; (4) formed on the surface of flammable materials Al2O3, prevent burning. MDH is the rapid development of an additive inorganic metal flame retardant, low smoke, non-toxic, can neutralize the acidity of the combustion process and corrosive gases. ATH flame retardant mechanism and its similarity.