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Do you know the classification of halogen-free flame retardants?


Release time:

Sep 13,2021

[Summary]Phosphorus halogen-free flame retardants are gradually favored by more and more people. These flame retardants and their derivatives are used as curing agents for polymers. The properties of epoxy resins cured with them are different from those of brominated epoxy resins, especially their flame retardancy and thermal stability. There are two hydrocarbon groups in the hesitation period, so it can be used as a curing agent for epoxy resin. Compared with the traditional epoxy resin, the cured epoxy resin can be higher than 40 ℃, and it will not produce black smoke and hammering.

When a fire occurs, some flame retardants containing halogen molecules will produce a lot of smoke in the process of playing a role, blocking people's sight, and emitting toxic hydrogen halide gas, which will cause secondary harm to the environment and people. Therefore, The emergence of halogen-free flame retardants has rapidly replaced flame retardants containing halogen molecules. This halogen-free flame retardant is not easy to produce smoke during the combustion process, and will not produce some toxic or even corrosive gases. It mainly uses the addition of phosphorus compounds and metal hydroxides as the main raw materials. These two chemical substances will not be exposed to open flames. Volatile, non-toxic and harmless, is a pollution-free halogen-free flame retardant. Next, the small series will introduce the classification of halogen-free flame retardants to help you better understand halogen-free flame retardants.

phosphorus systemhalogen-free flame retardantThese flame retardants and their derivatives are used as curing agents for polymers, and the properties of epoxy resins cured with them are different from those of brominated epoxy resins, especially their flame retardancy and thermal stability. There are two hydrocarbon groups in the hesitation period, so it can be used as a curing agent for epoxy resin. Compared with the traditional epoxy resin, the cured epoxy resin can be higher than 40 ℃, and it will not produce black smoke and hammering.

The intumescent halogen-free flame retardant can act in the direction of cohesion, and in a lower environment, as the acid in the deacidification agent, it can be esterified at a higher temperature. The amine in the reaction system can be used as a catalyst for the esterification reaction to accelerate the reaction, and the system melts before or during the esterification reaction; The water vapor generated during the reaction and the non-flammable gas generated by the gas source expand and foam the system already in the molten state. At the same time, the polyol and ester are dehydrated and carbonized to form inorganic matter and carbon residue, which further bubbles the system; When the reaction is nearly complete, the system gels and solidifies to form a porous carbon foam layer.


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