One-step synthesis of brominated sbs production process

Abstract

The invention discloses a production process for one-step synthesis of brominated SBS, which belongs to the technical field of brominated SBS production, and comprises the steps of: dissolving SBS with an organic solvent, adding a brominating agent diluted with an organic solvent, the brominating agent adopts bromine The mixture of element and tribromide, the tribromide is trimethylphenylammonium tribromide, add catalyst, the catalyst is tin tetrachloride, the bromination reaction temperature is 10-40°C, and the reaction time is 2 ‑8h; decolorize, wash, and crystallize the feed solution after the above reaction, then pour the crystallized material into a centrifuge, wash with water after centrifugation, filter, and dry to obtain the brominated SBS product. In the present invention, bromine and a small amount of tribromide are added as bromination agents in the production process, and the hydrogen bond substitution reaction is suppressed by adding an appropriate amount of catalyst, so that the addition reaction is the main one, the side reactions are reduced, and the product structure is more stable. The thermal stability of the brominated SBS is improved, and the reaction is a one-step production process, which improves the production efficiency.

Description

Technical field [0001] The present invention relates to the field of SBS production in SBS, and in particular to a production process of synthesizing brominated SBS. Background technique [0002] The brominated SBS is a new environmentally friendly bromine flame retardant, which is more easily configured in mechanical processing, and the SBS is inserted in the melting mixture, injecting the foam process conditions. It is very small tolerant, almost no heat degradation, the process temperature can reach 230 ° C or more, the thermal stability is better, in addition, the flame retardant compatibility is good, does not have a negative effect on the mechanical properties of the added material, Furthermore, it is determined by the US Environmental Protection Agency as a safety substitute for flame retardant hexabrominated cycloalkane. [0003] The existing brominated SBS synthesis method is available in a variety of brominating agents, but there are still some problems, such as directl...

AI Technical Summary

Problems solved by technology

[0003] There are many types of brominating agents to choose from in the existing brominated SBS synthesis method, but there are still some problems, such as directly using bromine as the brominating agent, bromine has high energy, lively properties, and is very easy to bond with hydrogen in SBS A substitution reaction occurs, thereby inhibiting its addition reaction with the double bond in SBS, resulting in an increase in side reactions. Because of its imperfect structure, it further causes thermal weight loss to decrease and thermal stability to deteriorate; while only using a brominating agent to react Sometimes, the cost is high, the process steps are cumbersome, and often the reaction requires a two-step method, which affects production efficiency

In addition, the bromination reaction is rapid and the degree of reaction is difficult to control, resulting in incomplete reaction, and the resulting brominated SBS product has poor thermal stability and cannot meet the needs of use, which limits the large-scale production and general application of brominated SBS