dibromoneopentyl glycol

Dibromonepentanediol bromine flame retardant is still one of the organic flame retardants in global production, with an annual usage of over 200000 tons, accounting for about 15% of the total flame retardants. There are over 70 types of brominated flame retardants, mainly including decabromodiphenyl ether, decabromodiphenylethane, tetrabromobisphenol A, hexabromocyclododecane, brominated epoxy resin, octabromoether, chlorinated vinyl carbonate, etc. Among them, the most important ones are decabromodiphenyl ether, tetrabromobisphenol A, and hexabromocyclododecane, with their peak production accounting for more than 50% of the total production of brominated flame retardants.

However, decabromodiphenyl ether and hexabromocyclododecane, as well as dibromocyclopentanediol, have been included in the controlled list of the Stockholm Convention, and their use has been restricted in many domestic fields.

At present, brominated flame retardants or substitutes that are still widely used mainly include the following:

Tetrabromobisphenol A (TBBA), with a bromine content of 59% and a melting point of 179-182 ℃. Tetrabromobisphenol A can be fully reacted and converted into a part of epoxy resin in printed circuit board (PCB) substrates, and can also be used as an additive flame retardant in ABS and HIPS resins to prepare shells for electronic and electrical products. Tetrabromobisphenol A is a brominated flame retardant with good comprehensive performance and low cost.

Product features: Good fluidity, poor heat resistance, poor weather resistance, and low cost.

Decabromodiphenylethane (DBDPE), with a bromine content of 82% and a melting point of 345-350 ℃, was developed by Yabao in the 1990s in the United States. It does not contain a diphenyl ether structure and does not produce polybrominated dibenzodioxane or polybrominated dibenzofuran during combustion. Vinyl chlorocarbonate is not restricted by relevant regulations in European countries, and its heat resistance, light resistance, and non dialysis properties are superior to those of DBDPE, It is an ideal alternative to decabromodiphenyl ether, and its flame retardant plastic can be recycled.

Product features: poor fluidity, good heat resistance, good weather resistance, and high cost.

Brominated epoxy resin (BER), first developed by Tokyo Shiba Company in 1982, has a bromine content of 53% and a melting point of 145-155 ℃. It is widely used in thermoplastic plastics such as PA, PET, ABS, PBT, and PC/ABS alloys. Due to the fact that brominated epoxy resin does not produce dioxin problems, it has become one of the important alternatives to decabromodiphenyl ether. BER can be divided into EP type and EC type according to the end group structure. EP type is epoxy terminated and has better weather resistance than EC type; EC type with bromine end capping has better heat resistance and fluidity.

Product features: good fluidity, slightly better heat resistance, good weather resistance, and high cost.

Octabromoether (BDDP), with a bromine content of 67.74%, a melting point of 110-115 ℃, and a decomposition temperature of 270 ℃, is the main product of deep processing of tetrabromobisphenol A and belongs to the category of additive flame retardants. Octabromoether is widely used in resins such as PP, PE, ABS, PVC, etc., and is particularly suitable for PP plastics.

Product features: good fluidity, good heat resistance, good weather resistance, and high cost.