Function of phosphorus: It decomposes at high temperature to generate acidic substances such as phosphoric acid and polyphosphoric acid, catalyzes the dehydration of polymers into carbon, and forms a dense carbon layer. This carbon layer isolates oxygen and heat, and inhibits the release of combustible gases.

Hexachlorocyclotriphosphazene is a raw material for the preparation of cyclotriphosphazene derivatives and phosphazene flame retardant materials. Its traditional synthesis method has disadvantages such as long reaction time and low synthesis yield. The researchers have carried out optimization exploration on the selection of reaction raw materials, catalyst selection, separation and purification and other process conditions, and achieved good results, providing technical guarantee for the development of the phosphazene flame retardant material industry.

The benzene ring structure is conducive to improving the heat resistance of cyclophosphazene. Cyclophosphazenes with phenyl, phenoxy or aniline groups are not only heat-resistant and hydrolysis-resistant, but also have high LOI and low smoke emission, and are suitable for use in coatings, foam plastics, fibers and other materials. Phenoxycyclotriphosphazene (PCPZ) is a cyclic phosphazene compound, which is a light yellow or white powder or product. It can be directly added to polyethylene to prepare flame-retardant polyethylene materials, and the LOI of the material can reach 30.0%~33.0%.

Hexachlorocyclotriphosphazene is a white crystal with a molecular weight of 347.66, a melting point (m.p.) of 112~114℃, a boiling point (b.p.) of 256℃, and is easy to sublime. It is soluble in most organic solvents, such as toluene, tetrahydrofuran, acetone, etc. There are two active chlorine atoms connected to the phosphorus atom, which can be partially or completely replaced by nucleophilic reagents to generate various cyclophosphazene derivatives, and then various phosphazene functional materials can be prepared through molecular design. It is a very important fine chemical intermediate.