In any case, halogen-free flame-retardant Nylon is definitely the best choice in the future, halogen-free options mainly are red phosphorus, Melamine Cyanurate and Aluminum Diethyl Phosphinate ADP.
China is the world's largest phosphorus resource, so phosphorus has a huge cost advantage, high Flame Retardant efficiency, more widely used. Manufacturers of environmentally friendly flame retardants know that red phosphorus forms phosphoric acid after thermal decomposition. On the one hand, phosphoric acid as dehydrating agent promotes the formation of carbon.The formation of carbon reduces the heat transfer from flame to condensed phase. Phosphoric acid, on the other hand, can absorb heat by reducing the heating process by preventing CO oxidation to CO2. The flame retardant mechanism of endothermic and condensed phase was used.
The color of red phosphorus limits it to dark Nylon products such as black or red, so melamine Cyanurate is generally used in light color or transparent Nylon.
Melamine Cyanurate mainly include melamine cyanuric acid (MCA), melamine polyphosphate (MPP), etc., with low toxicity, low corrosion, high flame retardant efficiency, no conflict with additives and other advantages. When used alone in PA, it will reach UL94 V-0.
After thermal decomposition of melamine Cyanurate, part of the heat is taken away, and the surface temperature of PA decreases. From the gas phase point and the condensed phase of view, decomposition is easy to release Ammonia nitrogen oxide vapor and other non-combustible gases, dilute the concentration of combustible gas and combustion-supporting gas, hinder the further combustion of PA, and improve the degradation of PA materials, promotes the formation of residual carbon and protects the interior of matrix.
When using these flame retardants, in order to reduce the cost and maximize the effect of flame retardants, manufacturers of environmentally friendly flame retardants will mix them according to the synergistic effect. For example, halogen flame retardants with gas phase flame retardants and phosphorous flame retardants with solid flame retardants will form a complete gas-solid flame retardants system. Nitrogen-based flame retardants can promote the carbonization of phosphorus compounds.
Aluminum Diethyl Phosphinate ADP series is especially suitable for glass fiber reinforced nylon series to achieve perfect anti-fire effect.
Novista Group supplies APP, MCA, aluminium hydroxide,magnesium hydroxide to global market.
