What are the main forms of flame retardant materials?
Flame retardant materials include organic flame retardant materials and inorganic flame retardant materials. The current flame retardant materials are materials that can achieve flame retardant effect after adding flame retardant. Generally speaking, there are many kinds of flame retardants, including organic flame retardants and inorganic flame retardants. Organic flame retardants have good flame retardant effect and few additives. However, organic flame retardants have the disadvantages of large amount of smoke and release of toxic gases in combustion. Inorganic materials have the advantages of non-toxic, smokeless, non-volatile and cheap, but there are a large number of additives.
In recent years, with the increase of plastic product output and the improvement of safety standards, flame retardant materials are more widely used. Generally speaking, flame retardant materials can be divided into organic flame retardant materials and inorganic flame retardant materials. Among them, the organic flame retardant material is mainly halogen additive, inorganic material not only has certain flame retardant effect, but also produces hydrogen chloride and prevents smoke. In addition, inorganic flame retardant materials are non-toxic, non-corrosive and cheap. The consumption of inorganic flame retardant materials in the United States, Japan and other countries is more than 60%. However, the consumption of inorganic flame retardant materials in China is less than 10%.
At present, flame retardant materials are mainly organic and inorganic, halogen and non-halogen.
Organic is some flame retardants represented by bromine, nitrogen, red phosphorus and compounds. The inorganic compounds are mainly antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon and other flame retardant systems.
In general, the magnesium hydroxide flame retardant has good affinity, is added in the plastic, and the bromine-based flame retardant occupies an absolute advantage in the organic flame-retardant system.
Inorganic flame retardant materials
Commonly used species are as follows: 1. Antimony trioxide. It must be used in conjunction with organic flame retardants. (2) Magnesium hydroxide and aluminium hydroxide. It can be used separately, but it has a large amount of additions, which is often equivalent to the amount of resin used. (3) Inorganic phosphorus. Commonly used red phosphorus and sulfate, pure red phosphorus after micro-treatment before use, can be used alone and combined, phosphate has ammonium phosphate, ammonium nitrate and so on. (4) Boron flame retardant materials. Zinc borate is commonly used in conjunction with other flame retardants. Other metal oxides, such as metal aluminides and metal ferrites, are mainly used for smoke. _Metal halides. Such as all kinds of antimony halide.
Organic Flame Retardant Materials
Commonly used species are the following: (1) Organic halides. They are mainly bromides, commonly used are decabromobiphenylic acid (DBDPO), tetrabromobisphenol A (TBBPA), brominated polystyrene (BPS), etc. Only chlorinated paraffin and chlorinated polyethylene have been used. Halides are often used in conjunction with antimony trioxide or phosphide. (2) Organic phosphide. It can be divided into inorganic phosphorus and halogenated phosphorus. Halogen-free phosphorus is mainly phosphoric acid such as triphenyl (TPP). Halogen-free phosphorus needs to be joined with halogen phosphorus. Halogenated phosphorus contains both phosphorus and halogen elements in the molecule, which have intramolecular synergism and can be used alone. Common species such as trichloroethylene (TECP) are used. (3) Nitrogen system. The main varieties are trinitrosamines, which are commonly used in PA and PU, and in conjunction with phosphorus flame retardants.