Silicon flame retardants

Silicone is eco-friendly, widely available in nature and is easy to prepare flame retardant from it. The silica ash layer can also prevent oxygen from reaching the matrix. A novel, simple and low cost flame retardant containing phosphorus, nitrogen and silicon was synthesized [17]. LOI was improved from 18.0 to 27.1, wrinkle recovery angle increased from 800 to 980. A novel phosphorous-silicone-nitrogen ternary flame retardant (FR), [(1,1,3,3-tetramethyl-1,3-disilazanediyl)di-2,1-ethanediyl] bis(diphenylphosphine oxide) (PSiN) was synthesized. An UL 94 V-0 rating was achieved with 20 wt % PSiN in the epoxy composites. Silica tended to migrate to the surface of polymer for its low surface energy.

Nitrogen components turned into gas in the combustion process. Phosphorus components played a role of FR in both condensed phase and gas phase. All the results indicated that current P-Si-N ternary FR might be a good candidate for epoxy flame retardancy [18]. Three novel phosphorus-based flame retardant monomers were successfully prepared by reacting 1-(acryloyloxy)-3-(methacryloyloxy)-2-propanol (AHM) with hexachlorocyclotriphosphazene. With the aid of a photo initiator and a UV flood curing system, these monomers were cured onto cellulosic substrates to generate flame retardant coatings. All three monomers formed coatings under UV conditions in the presence of the photo initiator that were durable to extraction. Only 15 % of these monomers were required to prevent the substrates from combusting in the horizontal, 450 and vertical orientations [19]. Recently silicon-containing monomers have successfully used as reactive-type HF FRs, especially polyhedral oligomeric silsesquioxanes (POSS), due to their notable reinforcing effect [20].

Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market