A kind of method of synthesizing brominated polystyrene
A technology of brominated polystyrene and polystyrene, which is applied in the field of synthesizing brominated polystyrene, can solve the problems of polystyrene molecular weight reduction, long production cycle, and rising product cost, so as to improve thermal stability, molecular weight, etc. The effect of narrow distribution and low chroma value
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Embodiment 1
[0025] Add 200g of dichloroethane and 10g of polystyrene in a 500mL four-neck flask with a water content of less than 100ppm, connect the tail gas system, and use dry nitrogen to replace the air in the system 3 times; cool down to -5~0°C and add 0.2g of trichloride Aluminum, add 0.03g BHT at the same time; add 43g bromine dropwise, and nitrogen gas continues to flow in while dropping, and the dropping time is 2 hours. deal with.
[0026] Post-processing method: Slowly pour the above solution into 200g of 0.1% sodium sulfite solution, use potassium iodide test paper to detect whether the water layer has changed color; leave the oil-water mixture to separate layers, and add the oil layer to 200g of 1% sodium hydroxide solution Stir and wash for 30 minutes, then stand to separate the layers again, add 200g water to the oil layer and wash for 30 minutes, let stand to separate the layers; add the oil layer dropwise into boiling water at 100°C, remove dichloroethane by flash evapora...
Embodiment 2
[0028] Add 200g of dichloroethane and 10g of polystyrene in a 500mL four-neck flask with a water content of less than 100ppm, connect the tail gas system, and use dry nitrogen to replace the air in the system 3 times; cool down to -5~0°C and add 0.2g of trichloride Aluminum, add 0.03g TEMPO at the same time; then add 43g bromine dropwise, and nitrogen gas continues to flow in while dropping, the dropping time is 2 hours, after the dropping is completed, the temperature is raised to 0~10°C and kept for 2 hours; Processing, aftertreatment mode is the same as embodiment 1. 31.2 g of brominated polystyrene finished product was obtained. The yellow index of the product is 13, the bromine content is 68.7%, and the temperature of 1% TGA is 358°C.
Embodiment 3
[0030] Add 200g of dichloroethane with a water content of 100~200ppm and 10g of polystyrene into a 500mL four-neck flask, connect the tail gas system, and use dry nitrogen to replace the air in the system 3 times; cool down to -5~0°C and add 0.2g of trichloro Aluminum chloride, add 0.03g BHT at the same time; add 43g of bromine dropwise, and continue to feed nitrogen gas during the dropwise addition. The dropwise addition time is 2 hours. Post-processing, post-processing mode is the same as embodiment 1. 32.2 g of brominated polystyrene finished product was obtained. The yellow index is 13, the bromine content is 68.6%, and the temperature of 1% TGA is 351°C.
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