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

When a fire breaks out, some flame retardants containing halogen molecules will produce a lot of smoke during their function, block people's sight, and emit toxic hydrogen halide gas, which will cause secondary harm to the environment and people. Therefore, Halogen free flame retardants have rapidly replaced flame retardants containing halogen molecules. This halogen-free flame retardant is not easy to produce smoke during combustion, and will not produce some toxic or even corrosive gases. It mainly uses phosphorus compounds and metal hydroxides as the main raw materials. These two chemical substances will not volatilize when exposed to open flames. , non-toxic and harmless, is a pollution-free halogen-free flame retardant. Next, I will introduce the classification of halogen-free flame retardants to help you better understand halogen-free flame retardants.

Phosphorus-based 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 performance of epoxy resins cured by them is similar to that of brominated epoxy resins. Many differences, especially in 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 traditional epoxy resin, the cured epoxy resin can be higher than 40°C, without black smoke and hammering, and can be used as a circuit Board level foundation.

The intumescent halogen-free flame retardant can play a role through the cohesion direction. In a lower environment, it can be used as an acid in a deacidification agent to perform esterification at a higher temperature. The amine in the reaction system can be used as a catalyst for the esterification reaction to accelerate the reaction. The system melts before or during the esterification reaction; the water vapor generated during the reaction and the incombustible gas generated by the gas source make it already melted The system in the state expands and foams. At the same time, polyols and esters are dehydrated and carbonized to form inorganic substances and carbon residues, which further foam the system; when the reaction is nearly complete, the system gels and solidifies to form a porous foam carbon layer.