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What is Flame retardant mechanism of unsaturated polyester resin?

Jan 30, 2019

Flame retardant mechanism of unsaturated polyester resin

Flame retardant of FRP pipes is usually achieved by adding flame retardant to the resin matrix.Flame retardants can be divided into additive type and reactive type according to different application methods.The additive flame retardant mainly plays the role of flame retardant by adding flame retardant in combustible.Reactive flame retardants introduce flame retardant groups into polymer materials through chemical reactions, so as to improve the flame resistance of materials and prevent the materials from being ignited and inhibit the spread of flames.In the types of flame retardants, additive flame retardant is the dominant, the use of a wide range, accounting for about 85% of the flame retardant, reactive flame retardant accounted for only 15%.

Flame retardant is through a number of mechanisms to play its role in flame retardant, such as heat absorption, coverage, inhibition of chain reaction, asphyxiation of non-flammable gas.Most flame retardants achieve their flame retardancy through several mechanisms. 

The flame retardants can be divided into halogen flame retardants, phosphorus flame retardants, nitrogen flame retardants, phosphorus-halogen flame retardants, phosphorus-nitrogen flame retardants, etc.In the pyrolysis process, halogen flame retardants decompose X• and HX which capture and transfer combustion free radicals. HX can dilute the combustible gas generated during the pyrolysis of combustible material and cut off the contact between the combustible gas and air.Phosphorous flame retardant produces phosphoric anhydride or phosphoric acid in the combustion process, which promotes the dehydration and carbonization of combustible substance and prevents or reduces the generation of combustible gas.Phosphoric anhydride in the pyrolysis also forms a glass-like molten substance covering the surface of the combustible material, prompting its oxidation to form carbon dioxide, which ACTS as a flame retardant.In nitrogen-series flame retardants, nitrogen compounds and combustibles play a role in promoting the cross-chain formation of carbon, reducing the decomposition temperature of combustibles and producing non-combustible gases, thus diluting combustible gases.Phosphorus-halogen flame retardant and phosphorus-nitrogen flame retardant mainly achieve the purpose of flame retardant through the synergistic effect of phosphorus-halogen and phosphorus-nitrogen, which has the double effect of phosphorus-halogen and phosphorus-nitrogen, and the flame retardant effect is better.


QuanZhou Neweco High Polymer Material Co.,Ltd.

Neweco is one of the leading unsaturated polyester resin manufacturers and  suppliers,widely used in automobiles, ships, rail transit, wind power  generation, pipe cans, heat and corrosion protection, building  materials, stone repair, sanitary ware, artificial stone and other  industries. Suitable for hand lay-up, spray, pultrusion, winding,  molding, vacuum introduction / RTM, casting and other molding processes. Neweco Resin is committed to excellence and focuses on the application  of composite materials to provide customers with comprehensive  solutions.

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