Classification of Flame Retardant Masterbatches
Because of the advantages of flame retardant masterbatch in plastics such as flame retardant efficiency, environmental protection, improving production efficiency, convenience and so on, it has become an effective substitute for traditional flame retardant and has been widely used in granulation, extrusion, injection and other aspects of plastics.
At present, halogen series (Br, Cl), phosphorus series (red phosphorus, phosphorus compounds, etc.), nitrogen series (commonly referred to as intumescent flame retardant masterbatches) and inorganic flame retardant masterbatches (aluminium hydroxide, magnesium hydroxide, etc.) are the main flame retardant masterbatches to be popularized and applied.
Halogen-based flame retardant masterbatch (masterbatch) is the most popular flame retardant masterbatch in most resins nowadays. The reason is that its own organic properties make it better affinity with plastics. As a result, the mechanical properties of the finished products decrease less and the flame retardant efficiency is high, and the amount added in the resin is less, and the cost performance ratio is high. The disadvantage is that some of them are biotoxic and prohibited in some international standards. And because of the poor environmental protection performance, especially in Europe, there is a tendency to be eliminated.
Phosphorus flame retardant masterbatches are also widely used products. In some resins, their flame retardant efficiency is even higher than halogen system. However, they have many shortcomings, such as poor color coordination, poor compatibility, low oxygen index and low applicability to processing technology, and can only be used in special industries. Intumescent flame retardant masterbatch has narrower application scope because of its low flame retardant efficiency and easy "foaming" and many other inadaptability. Inorganic flame retardant masterbatch, such as magnesium hydroxide. Its flame retardant products are environmentally friendly, do not emit toxic gases, smoke is small, and the oxygen index of flame retardant plastics is high. However, due to the excessive amount of additives which meet the ideal flame retardant standard and the natural incompatibility between inorganic and organic substances, it is still difficult for the modified products to meet the needs of most industries, so its promotion is limited. It is believed that after the technological progress, relying on its advantages in environmental protection can also be gradually recognized by the market.
