Phosphonate ester flame retardants play an important role in the application of engineering plastics due to their chemical stability and flame retardant performance. The following is the specific analysis:
Due to the presence of carbon-phosphorus bonds, phosphonate ester flame retardants have significantly enhanced chemical stability, better water and solvent resistance, and long-lasting flame retardant performance. The most representative phosphonate ester flame retardant, dimethyl methylphosphonate (DMMP), is an additive flame retardant and is widely used in the flame retardancy of high molecular materials such as polyurethane, foam plastics, unsaturated polyester resins and epoxy resins. However, DMMP has a relatively small molecular mass. When applied to polymer materials, it has the disadvantage of easy migration. At the same time, its boiling point is relatively low, which greatly limits its application range.
In recent years, some new types of phosphonate ester flame retardants have been developed. Such as N, N-bis (2-hydroxyethyl) aminomethylphosphonate diethyl ester (BHAPE), bis (2-chloroethyl) vinylphosphonate ester (CEVP), 1-[[(2-chloroethoxy)(2-chloroethyl hypophosphonyl) oxy] ethyl] phosphonate -1-[bis (2-chloroethoxy) hypophosphonyl] ethyl – 2-chloroethyl ester, N-hydroxymethylpropanamide-type methylphosphonate ester These flame retardants not only have good flame retardant performance, but also effectively overcome the disadvantage of DMMP’s easy migration, and their application performance has been greatly improved.
In addition, cyclic phosphonates are a type of additive flame retardants with high thermal stability and excellent water resistance, mainly used for flame retardancy of polyester fibers, polyurethane foam plastics and thermosetting resins.
