Flame retardant

Flame retardant, also known as flame retardant, fire retardant or fire retardant, is one of the most commonly used modifying additives for polymer materials. 

The flame retardant market has a huge amount of use and a wide variety of types.

Flame retardants are widely used to modify various resins such as PP, PE, PS, PVC, ABS, TPU, PBT, PET, PA, PC, etc.

1. Organohalogen flame retardants

Halogen flame retardants, as an important variety of organic flame retardants, are the earliest type of flame retardants used. 

Due to its low price, good stability, small amount of addition, good compatibility with synthetic resin materials,

 and its ability to maintain the original physical and chemical properties of flame retardant products, 

it is currently the most produced and used organic flame retardant in the world.

2. Phosphorus flame retardants

Phosphorus flame retardants include inorganic phosphorus flame retardants and organic phosphorus flame retardants.

Inorganic flame retardants mainly include: red phosphorus, ammonium polyphosphate (APP), 

ammonium phosphate, phosphate and polyphosphate, etc.; organic phosphorus flame retardants mainly include: phosphate ester, phosphaphenanthrene (DOPO), 

phosphazene Compounds, organic phosphinic acid and organic phosphinate salts, etc.

3. Nitrogen flame retardants

Commonly used varieties include melamine, melamine cyanurate (MCA), etc., 

which often require the addition of synergists and are used in resins such as PA, PU, PO, PET, PS, and PVC. 

Nitrogen/phosphorus is the most commonly used synergistic flame retardant system.

Melamine cyanurate is a nitrogen-containing halogen-free environmentally friendly flame retardant that can make flame retardant materials reach UL94 V-0. 

It is especially suitable for PA6 and PA66 without fillers. It belongs to the nitrogen series flame retardants and has powder Available in two forms: pellet and granular. 

When the flame-retardant polyamide foam of this product is burned, the carbon foam layer formed protects the polymer and insulates heat and oxygen.

4. Inorganic flame retardants

Inorganic flame retardant (inorganic flame retardnat) is a high-temperature solution composed of ultrafine inorganic metal oxides added to fine processing.

Inorganic flame retardants mainly add inorganic elements with intrinsic flame retardancy to the flame-retardant substrate in the form of simple substances or compounds, 

and fully mix them with the polymer in a physically dispersed state. They are chemically or in the gas phase or condensed phase. Physical changes act as flame retardants.

1. Antimony trioxide

It is an additive flame retardant and is often used together with other flame retardants and smoke suppressants. Each component can produce a synergistic effect.

2. Aluminum hydroxide (ATH)

Aluminum hydroxide is the most sold flame retardant for inorganic hydroxides and is mainly used for artificial rubber, thermosetting resins and thermoplastics with processing temperatures below 200°C. 

Aluminum hydroxide flame-retardant plastics emit less smoke in flames.

3. Magnesium hydroxide (MDH)

Magnesium hydroxide is an inorganic flame retardant with better thermal stability and is still stable above 300°C. 

It is widely used in many artificial rubbers, resins, including engineering plastics and other resins processed under high temperature.