Should flame-retardant PP choose halogen-free or halogenated?

Jan. 01, 70

The characteristics of flame retardant materials are determined by flame retardants. Polypropylene flame retardants can be divided into halogen-containing and halogen-containing. Halogen-containing flame retardants refer to flame retardants containing halogen elements such as Cl, Br, F, etc. Halogen-free flame retardants include phosphorus series flame retardants, inorganic flame retardants, magnesium hydroxide, aluminum hydroxide, zinc borate, etc. Halogen-free flame retardants can also be divided into intumescent flame retardants and some special purpose flame retardants. Correspondingly, flame-retardant PP can also be divided into halogen-containing flame-retardant PP and halogen-free flame-retardant PP. Halogen-free, according to the requirements of IEC 61249-2-21: the content of bromine and chlorine is less than 900ppm, and the sum of the content of bromine and chlorine is less than 1500ppm, it is halogen-free, and it is often called low halogen in work.

Whether the material is halogenated or halogen-free is based on reality

In recent years, although halogen-free flame retardant has developed rapidly, it has not negated the value of halogen-free flame retardant products. Halogen-containing flame retardants are currently the most widely used flame retardant products in plastic rubber and plastic materials, mainly because they are organic flame retardants with inert chemical properties and good compatibility with plastics. The Rosh Directive of the European Union believes that the burning of octabromodiphenyl ether and pentabromodiphenyl ether in halogen-containing flame retardants produces dioxins, which are listed in the banned list. Decabromodiphenyl ether is also not recommended for flame retardants due to dispute, However, most halogen-containing flame retardants have not been completely banned, because it is currently difficult to find a product that can completely replace them. People have seen the good mechanical properties of halogen-containing flame-retardant PP, but also saw the advantages of low smoke emission of halogen-free flame-retardant PP. Seeing that the halogen-containing flame-retardant PP flame retardant is added in a small amount, I also appreciate the high halogen-free flame-retardant GWIT. Seeing that halogen-containing flame-retardant PP is easy to process, it also saw the continuity and renewability of halogen-free flame-retardant PP synthetic raw materials. People have seen that halogen-containing flame-retardant PP has poor dyeability and at the same time suffers from the large color difference of halogen-free flame-retardant PP. Many features are irreplaceable by others. Nothing is absolute, whether there is halogen or halogen-free, the selection of materials should be based on reality.

246-阻燃pp选材-阻燃与灼热丝

Only when the requirements are accurate can the selection of materials be accurate

Halogen-free flame-retardant PP is a "green" environmentally friendly product. Not only has the characteristics of low smoke, but also has the advantage of lightweight. The density of 20% mineral synergistic halogen-containing flame-retardant PP is about 1.30, and the density of ordinary flame-retardant PP is about 1.05. The number of products produced with the same quality of halogen-free products is 1.24 times that of halogen-containing products, and the advantages of halogen-free flame retardant products at the same price are evident. With the development of flame-retardant materials today, meeting UL94V0 is no longer news. Under the same flame-retardant grade requirements, GWIT often becomes a key factor in people's selection of materials. Under non-open flame conditions, the GWIT of halogen-free flame-retardant PP is about 850°C, while the halogen-containing flame-retardant PP has burned at 750°C. Halogen-free flame retardants have achieved the irreplaceable advantages of halogen-free flame-retardant PP. At the same time, it has also created unavoidable shortcomings. In the case of large injection molds or complex structures, the small-molecule ammonium polyphosphate of halogen-free flame retardants decomposes Phosphoric acid is produced and migrated to the surface of the part. The part is easy to "stick to dust" and also "sticky". The surface of the part is also poor when the color changes during a long time of heat retention. However, halogen-containing flame retardant PP is complete There is no such phenomenon.