It is understood that: Octabromoether is also known as tetrabromobisphenol A (2,3-dibromopropyl) ether . It is in the form of off-white powder with a molecular weight of 943.65. Off-white powder, relative density 2.17. Melting point 107~120℃. The theoretical bromine content is 67.7%. Soluble in dichloroethane, toluene, acetone, slightly soluble in water and methanol.
The decomposition temperature of octabromoether is 270°C. It is the main product of deep processing of tetrabromobisphenol A and has better flame retardant effect. Among polymer flame retardants, it is an additive flame retardant. It is often used as a flame retardant for polypropylene (PP), polyethylene (PE), polybutylene and many polyolefin copolymers. It is especially suitable for PP plastics and is currently the best flame retardant for PP plastics.
The flame retardant mechanism of octabromoether is as follows:
1. Due to the low bond energy of C-X of this flame retardant, its decomposition The temperature is basically consistent with the thermal decomposition temperature of the material. When the flame retardant is heated, it decomposes, absorbs part of the heat and lowers the temperature. At the same time, the density of the hydrogen halide gas HX generated by the decomposition is greater than that of air, which can crowd out the air around the material and form oxygen. permeability barrier.
2.HX can also react with the free radical HO Chemicalbook- from polymer decomposition to generate halogen free radical X-, and X- can react with the polymer chain to generate HX, and so on, thereby cutting off HO- reaction with oxygen.
3. The presence of flame retardants weakens the van der Waals force between polymer chains, making the material in a viscous flow state when heated. At this time, the material has fluidity, and can carry Remove part of the flame and heat to achieve flame retardant effect.
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