Synthesis Of New Triazine Charring Agents And Halogen-Free Flame Retardant ABS

ABS is a widely used polymeric material in every fields of national economy and peoples daily life, but the further application is restricted for its flammability. The triazine flame retardants have many advantages, such as lower volatility, higher flame retardant efficiency, innocuity, good compatibility and higher thermal stability. So the triazine derivatives are synthesized continuously and used as flame retardant in many polymers. The research and application of triazine derivatives have been paid great attention to. In this paper, two novel charring-agents have been designed and synthesized, their application have been investigated.Charring agent A that poly(2-ethylenediamine-4-phenoxy-l,3,5-triazine) as a triazine, which contains element of nitrogen that synthesized by Cyanuric chloride, phenol, ethylenediamine and sodium hydroxide worked as raw material. Then, based on charring agent-A, reaction with sodium hypophophite and hydrochloric acid, synthesized a triazine charring agent-B, which contains two flame-retardant elements of nitrogen and phosphorus. The structure of products were characterized by FTIR spectra, the thermal stability was investigated by TGA. The experimental results demonstrated that the synthetic yield rate of charring A was 93.9%, it had high thermal stability, and the initial degradation temperature is 266.18℃. The IFR-A system of a novel charring agent-A mixed with APP and Red Phosphorus. The IFR-A's initial degradation temperature is 250.81℃. The IFR-A added to ABS, when the addition of flame retardant was 30%, and the system could pass V-0 rating, its LOI reached 25.7, flexural strength, tensile strength and Notched Izod impact of flame retardant ABS are 48.52MPa, 30.13MPa and 4.127kJ/m², compared with pure ABS, the mechanical properties decreased 23.92% for flexural strength, 23.22% for tensile strength and 73.16% for Notched Izod impact, respectively. This experimental result further demonstrated that this composite flame retardant named IFR-A is an effective flame rerardant in ABS.The experimental results demonstrated that the synthetic yield rate of charring B was 85.4%, it had high thermal stability, and the initial degradation temperature is 252.45℃. The IFR-B system of a novel charring agent-B mixed with APP and Red Phosphorus. The IFR-B's initial degradation temperature is 242℃. The IFR-B added to ABS, when the addition of flame retardant was 30%, and the system could pass UL-94 V-0 rating, its LOI reached 25.6, flexural strength, tensile strength and Notched Izod impact of flame retardant ABS are 51.61MPa, 32.56MPa and 3.338kJ m^-2, compared with pure ABS, the mechanical properties decreased 23.92% for flexural strength, 23.22% for tensile strength and 73.16% for Notched Izod impact, respectively. This experimental result further demonstrated that this composite flame retardant named IFR-A is a effective flame rerardant in ABS. At the same time, compared with charring agent-A, the addition of Red Phophorus is reduced. The effect of the two intumescent flame retardants on mechanical properties was not very obvious on flexural strength and tensile strength, and obvious on Notched Izod impact only.The SEM experiment of the two novel charring agents in ABS and the structure of charring layer of IFR-ABS were characterized by scan electronic microscope. The experimental results demonstrated that charring-A was a little convergency in ABS, and charring-B had excellent consistent in ABS. Simultaneity, IFR-ABS had compact charring layer.