News

Keep Abreast Of Industry Cutting-Edge Technologies

How much do you know about halogen-free flame retardants?


Release time:

Jan 29,2021

[Summary]With the progress of science and technology, halogen-free flame retardants have also been developed accordingly, because halogen-free flame retardants are phosphorus compounds and metal hydroxides, and have a small amount of smoke during combustion and do not produce non-toxic and corrosive gases. It is called pollution-free flame retardants, so it is especially popular in many industries. The following is an introduction to the relevant knowledge of halogen-free flame retardants.

With the progress of science and technology, halogen-free flame retardants have also been developed accordingly, because halogen-free flame retardants are phosphorus compounds and metal hydroxides, and have a small amount of smoke during combustion and do not produce non-toxic and corrosive gases. It is called pollution-free flame retardants, so it is especially popular in many industries. The following is an introduction to the relevant knowledge of halogen-free flame retardants.

无卤阻燃剂

Endothermic effect: We know that the heat of anything during combustion is limited, and the flame retardant reacts under high temperature conditions, absorbs part of the heat released by the combustion, reduces the temperature of the combustible surface, and effectively prevents the combustion The generation of flammable gases prevents the spread of combustion. This kind of flame retardant gives full play to its characteristics of a large number of heat absorption when combined with water vapor, and improves its own flame retardant ability.

Covering effect: after adding flame retardant to combustible materials, it can form glassy or foam covering layer at high temperature, which has the function of heat insulation, oxygen insulation and preventing combustible gas from escaping outward, so as to achieve the purpose of flame retardant. For example, organic phosphorus-resistant flame retardants can produce solid substances or carbonized layers when heated. The formation of the carbonized layer can not only prevent the further pyrolysis of the polymer, but also prevent the thermal decomposition product from entering the gas phase to participate in the combustion process.

Inhibit chain reaction: flame retardants can act on the gas phase combustion zone to capture free radicals in the combustion reaction, thereby preventing the spread of the flame and reducing the speed of the combustion reaction until it terminates. Such as halogen-containing flame retardants, its evaporation temperature and polymer decomposition temperature of the same or similar, when the polymer is heated decomposition, flame retardants are also volatile, halogen can capture the free radicals in the combustion reaction, thereby preventing fire combustion.

Asphyxiation effect of non-combustible gas: flame retardant can decompose non-combustible gas during combustion. These non-combustible gas can dilute the concentration of combustible gas, and at the same time dilute the oxygen concentration in the combustion zone to prevent the combustion from continuing to achieve flame retardant effect.

 


Tag:


Learn More About Industry Dynamics