Polybrominated diphenyl ether
With polybrominated diphenyl ether (I learn a poly diphenyl ether), I am called PBDE (P B D E) about poly bromodiphenyl ether (Polybrominated diphenyl ether) for short.
Of oxidation diphenyl is provided by brominating it, and, by a number and a position of substituted bromine, 209 kinds of isomers exist in a calculation like PCB. The molecular formula is referred to C12H(10-n)BrnO (1 <= n <= 10).
It is less toxic than polybrominated biphenyl (PBB) which is same bromine-based fire retardant (BFR) and is added in an electric appliance and building materials, fiber as a fire retardant and is said to be it when there was the thing that PBDE occupies dozens of percent by the weight ratio. I could add the halogen-based fire retardant in wide material to control a combustion reaction in a vapor phase, and PBDE has been used in plastics from the height of the incombustibility effect widely. Oxidation antimony (diantimony trioxide) is used in common as an incombustible assistant with PBDE, too.
According to stopping the radical chain reaction of the combustion preceding paragraph floor by bromine catching a radical, the incombustibility mechanism is said.
Fat solubility is high, and PBDE has creature accumulation characteristics to have PCB and dioxin and similar structure and is bioaccumulated. Therefore PBDE is detected by a sample of various wildlife and Homo sapiens. On the other hand, because it is a bromine compound, it is sensitive to light and is understood for light immediately in comparison with these organochlorine. De-, brominating it gets up in a photolysis process, and there is the report that toxic high dioxin to brominate (outside link) is formed. Bromine-based dioxin is detected after combustion in the combustion examination of the material containing PBDE.
There are few reports about the toxicity of PBDE, but it is thought that the acute toxicity is low. Some super highly-concentrated revelation experiments suggest influence on thyroid hormone system or spermatogenesis.
The preparation has a kind of tetrapreparation, pentapreparation, octapreparation, the decapreparation by isomeric composition, and there is the most consumption of the decapreparation.
Octapreparation, the pentapreparation become a target of the regulation in RoHS order, and DBDE (decabromodiphenyl ether) which is 10 bodies to brominate becomes a target of the examination. The use of the PBDE preparation except the decapreparation has been reduced in Japan by the self-imposed restraint of the industry. I am not regulated in particular except some states in the United States. I become a target of RoHS for China in China. In addition, PBDE is considered to be POPs candidate material in the POPs treaty (Stockholm treaty about the persistent organic pollutant) (POPs points at an abbreviation, a persistent organic pollutant of persistent organic pollutants).
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