Study On New Synthesis Technology And Magnification Experiments Of Brominated Polystyrene

Brominated polystyrene (BPS), was born in the1980s, Albemarle company from USA took the lead to commercialization.In the1990s America Chemtura company invented the same structured products in a different way,Because of its synthesis process is different from the former, so it often called poly styrene brominated (PBS).Brominated polystyrene appears at the beginning, his development is relatively slow,But as the EU ROSH directive issued in recent years, some flame retardants are restricted or banned, as a kind of high molecular weight and environmentally friendly bromine flame retardants BPS just had more rapid development, taking our country as the example,nearly5～10years the construction of brominated polystyrene plant more than the sum of twenty years before.But domestic brominated polystyrene products and foreign products on the quality of the products have a large gap,So the product grade is low.hindered the popularization and application of brominated polystyrene in our country.This hinders the extension and application of brominated polystyrene in our country.This article launches some research on it and could get comparable to foreign products of high quality brominated polystyrene products to prepare for achieving high quality brominated polystyrene product localization.In this paper through the adoption of new catalytic system,Synthesis process of brominated polystyrene was optimized.We synthesized brominated polystyrene product with～the molten color shallow,through the TG, GPC and NMR analysis, established the optimal synthetic process:Control of solvent water content at about230ppm,The amount of catalyst SbC13and MXn was3%,Bromide reagent mole ratio BrCI:Ps=3.05:1,add time and heat preservation time both3hours.in the add stage,Keep the uniform and maintain the temperature at10～15℃;Heat preservation temperature30℃.With reference to the above process and parameters,Brominated polystyrene with bromine content more than66%,1%mass loss temperature344℃,5%Mass loss temperature374℃was synthesized in this paper,on the basis of lab-experimental results,this paper has carried on the enlargement experiments and the enlargement process is optimized,Gradient heating ways,maintain the reaction smoothly,reduce the occurrence of adverse events.Using combined mixing device, it significantly improves the heat transfer and mass transfer in the reaction process.After the performance test of enlargement products, we found that the enlargement products has1% mass loss temperature344℃,5%mass loss temperature374℃and bromine content more than67%.In this paper, by comparison with enlargement products and small scale experiment found that enlargement process producing brominated polystyrene is superior to the test process of synthetic products...