Decabromodiphenyl ethane and antimony trioxide (Sb2O3) after the combination of HIPS,PBT/PC and other materials have good flame retardant effect,it is an effective substitute for decabromodiphenyl ether, its heat resistance, light resistance, precipitation resistance are due to decabromodiphenyl ether. Because there is no ether chemical bond in its molecular structure, it will not produce toxic residue after combustion. Decabromodiphenyl ethane can be widely used inflame retardant polyolefin (PP,PE), HIPS, ABS, PA, PBT, PET, PC, PVC, silicone resin, epoxy resin, phenolic resin, unsaturated polyester resin, rubber, textiles, coatings, binder and soon.

1: Formulation and properties of decabromodiphenyl ethane flame retarded HIPS

(1)Formulas

HIPS：89.9kg；Decabromodiphenyl ethane：6kg；Brominated epoxy：2kg；Anhydrous zinc borate：0kg；Sb2O3：2kg；Antioxidant BHT：0kg；Antioxidant 1010：0.2kg；Antioxidant 168：0.2kg；

(2)Properties

Elongation at break：41kg;Tensile strength：23.5 /MPa;IZOD notched impact strength：10.1/(kJ/m2);Bending modulus：2111/MPa;Bending strength：31/MPa;Flammability：V-2(UL94,1.5mm);

It can be seen from 1 that HIPS containing 6% decabromodiphenyl ethane, 2% brominated epoxy resin, 2%Sb2O3, 0.1% antioxidant 1010 can reach the flame retardant UL94 V-2 level. Compared with pure HIPS, the physical and mechanical properties of the system are little affected. If increase the amount of flame retardant and add anhydrous zinc borate, that is, decabromodiphenyl ethane content is 9%, brominated epoxy resin is 5%, anhydrous zinc borate is 5%, Sb2O3 is 2%, antioxidant 1010 is 0.2%, antioxidant 168 is 0.2%, HIPS can reach the flame retardant UL94V-0 level. At the same time, the physical and mechanical properties of the system have not been greatly affected.

2, Formulation and properties of decabromodiphenyl ethane flame retardant PBT/PC alloy

(1)Formulas

PBT：60kg;PC：20kg;Compatibilizer 8920：8.2kg;Decabromodiphenyl ethane：6kg;

Sb2O3：5kg;TYT999：0kg;Antioxidant 1098：0.3kg;Antioxidant 168：0.2kg;Lubricant TAF：0kg;

Lubricant MB-4：0.3kg;

(2)Properties

Tensile strength：46.8/MPa;Bending strength：71.4/MPa;Bending modulus：2435/MPa;Notched impact strength：51.4/(kJ/m2);Hot deformation temperature：162.1/℃;Melt index：15.7/(g/10min);Flame retardant：V-0 (UL94,1.6mm);CTI*/V：600

As can be seen from Table 2,containing 6% decabromodiphenyl ethane,5% Sb2O3,0.3% antioxidant 1098, 0.2% antioxidant 168, 0.3% lubricant MB-4, 8.2% compatibility agent 8920, 20%PC and 60% PBT, compared with the non-flame retardant PBT/PC, the flame retardant level is increased to UL94 V-0 level. Other properties did not show significant reduction, and the bending modulus was greatly improved.

Decabromodiphenyl ethane also has a good effect on flame retardant PBT materials. The performance of the flame retarded enhanced PBT containing 9% decabromodiphenyl ethane, 4% Sb2Os, 30%~32% glass fiber was compared with that of the non-flame retarded enhanced PBT. The results showed that the ignition time of the flame retarded system was delayed, and the total heat release rate (peak and average) was only 1/4 of that of the non-flame retarded PBT, that is, the risk of the material in the combustion process was greatly reduced. The average effective heat of combustion is only 1/4 of the non-flame retardant, and the peak time is delayed 5 times, reflecting that the flame retardant has good flame retardancy; Flame retardant samples reach the vertical combustion UL 94 V-0 standard, LOI up to 31%, far more than the non-flame retardant enhanced PBT, flame retardant effect is obvious; The tensile strength and bending strength of flame-retardant enhanced PBT are unchanged, and the impact strength and bending modulus are reduced by only 5%. From this point of view, with decabromodiphenyl ethane flame retardant enhanced PBT, not only the flame retardant effect is superior, and the physical and mechanical properties maintain good, but the total smoke release increased by nearly 40%, still need to study adding some smoke suppressant, in order to reduce the smoke release.

Flame retardant PA6 containing 13% decabromodiphenyl ethane, 5% Sb2O3, 0.4% anti-drop agent can reach the flame retardant level of UL94 V-2(0.8mm, 1.6mm), and compared with the non-flame retardant modified PA6, in addition to the elongation at break and the impact strength of the non-notch cantilever beam is greatly affected, other physical and mechanical properties remain basically unchanged. The flame retardant PA66 containing 13% decabromodiphenyl ethane, 5% Sb2O3, 0.4% anti-drop agent can reach the flame retardant level of UL 94 V-2(0.8mm, 1.6mm), compared with the non-flame retardant modified PA66, Except that the impact strength of the unnotched cantilever beam decreased from 42.1kJ/m2 to 37.3kJ/m2 and the melt index decreased more, the other physical and mechanical properties remained basically unchanged.

70%-90% decabromodiphenyl ethane powder material, 4%-20% carrier resin and elastomer, 4%-10% dispersant polyethylene wax (with 0.5%~0.1% silicone lubricant), and 0.1%~1% titanate or silane coupling agent, heating and stirring in high-speed mixer or continuous modification unit equipment, To the material temperature rises to 95~100℃, and finally added to the twinscrew extruder, after granulation equipment granulation, after the vibrating screen automatically distinguish masterbatch specifications, after the dryer dehumidification packaging. When the content of decabromodiphenyl ethane is 85%~90%,the flame retardant effect of the masterbatch in the flame retardant material is consistent with the same quality of decabromodiphenyl ethane powder, and the physical and mechanical properties of the flame retardant material using the masterbatch are better than the flame retardant material using decabromodiphenyl ethane powder under the same formula. However, if the flame retardant content of the powder exceeds 90%, due to exceeding the action limit of the dispersant and coupling agent, the loss of equipment in the masterbatch processing will be greatly aggravated, and the serious depreciation of fixed assets will lead to a sharp increase in the cost of the masterbatch.