What are the effects of adding flame retardants on the properties of PP flame - retardant boards?

The addition of different flame retardants has different effects on polymer materials. Therefore, it is necessary to select appropriate flame retardants according to the structure, properties, processing conditions, and usage requirements of the polymer. 

Additive flame retardants are incorporated into the polymer through mechanical mixing methods to make the polymer flame retardant. Currently, additive flame retardants are mainly divided into organic flame retardants and inorganic flame retardants. Organic flame retardants are represented by some flame retardants such as bromine-based, phosphorus-nitrogen-based, nitrogen-based, red phosphorus and its compounds. Inorganic flame retardants mainly include flame retardant systems such as antimony trioxide, magnesium hydroxide, aluminum hydroxide, and silicon-based ones. 

For PP flame retardant sheets, bromine-based or phosphorus-nitrogen-based flame retardants are generally used. Among them, the addition amount of bromine-based flame retardants is relatively high, which has a great impact on the impact resistance and tensile properties of the sheets. On the other hand, the addition amount of phosphorus-nitrogen-based flame retardants is small, and the impact on the properties of the sheets is relatively small, which can meet the requirements of customers.