In many cases, the materials are required to have flame retardancy, the commonly used occasions are electronic appliances, and the automobile industry also has the flame retardant requirements, but generally low. Flame retardants can be achieved by adding flame retardants. Most plastics have flammability. With the wide application of plastics in building, furniture, transportation, aviation, aerospace and electrical appliances, improving the flame retardancy of plastics has become an urgent task.

Method and Principle of Flame Retardant

1) endothermic action

An endothermic reaction is a reaction that results in a net decrease in temperature because it absorbs heat from the surrounding environment and stores energy in the bonds formed in the reaction. In a relatively short time, the heat is limited. At high temperature, the flame retardant has a strong endothermic reaction, absorbs part of the heat released by combustion, reduces the surface temperature of combustible materials, effectively inhibits the formation of flammable gases and prevents combustion diffusion.

During the production process, the use of additives such as zinc stannate, hydroxystannate zinc and antimony white to enlarge its resistance to fire has increased.

Of all the additives that are added to PVC materials zinc stannate is the safest. When using it, it is important to avoid contact with the skin and eyes. One should also not inhale its fumes. It should be kept in tightly closed containers. Zinc stannate is stable up to 400 ˚C and therefore may be involved in the process of polymer melting at this temperature.

2) isolation

After flame retardant is added to the flame retardant material, the flame retardant can form glass or stable foam covering layer at high temperature and isolate oxygen. The utility model has the functions of heat insulation, oxygen resistance and preventing the external leakage of combustible gas, so as to achieve the purpose of flame retardant.

If organophosphorus flame retardants are heated, they can produce crosslinked solid materials or carbide layers, which are more stable in structure.

First, the formation of carbide layer prevents the further cracking of polymer, Second, it prevents the thermal decomposition of organic matter into the gas phase and participates in the combustion process.

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