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Red phosphorus
It is a purplish-red amorphous powder, lustrous and non-toxic. Under high pressure, it begins to melt at 590℃. If not pressurized, it does not melt but sublimates; after vaporization and condensation, white phosphorus is obtained. Red phosphorus has a high polymer structure formed by single bonds of P4 tetrahedrons forming chains or rings, and has high stability. It is insoluble in water and carbon disulfide, slightly soluble in absolute ethanol, and soluble in alkaline solutions. It reacts with nitric acid to form phosphoric acid, and when heated in chlorine gas, it forms chlorides.
Category:
Chemical Formula: P
Molecular Weight: 123.9
Production Capacity: 5,000 tons/year
Properties: It is a purplish-red amorphous powder, lustrous and non-toxic. Under high pressure, it begins to melt at 590℃; without pressure, it does not melt but sublimes. When vaporized and then condensed, it yields white phosphorus. Red phosphorus forms a high-polymer structure with chains or rings of P4 tetrahedra linked by single bonds, exhibiting high stability, insolubility in water and carbon disulfide, slight solubility in anhydrous ethanol, and solubility in alkaline solutions. It reacts with nitric acid to form phosphoric acid and with chlorine upon heating to form chlorides.
Applications: Red phosphorus, also known as red phosphorus, can be used to prepare semiconductor compounds and as a dopant for semiconductor materials. It can be used as a flame retardant for polyolefins, polystyrene, polyesters, nylon, polycarbonates, polyformaldehyde, epoxy resins, unsaturated resins, rubber, textiles, etc. It is particularly effective as a flame retardant for oxygen-containing polymers such as polyethylene terephthalate, polycarbonate, and phenolic resins. Compared to other phosphorus-based flame retardants, the same mass of red phosphorus can produce more phosphoric acid, which can cover the surface of the flame-retardant material and accelerate dehydration and carbonization on the material surface, forming a liquid film and a carbon layer that separates the external oxygen, volatile combustibles, and heat from the internal polymer matrix, thereby interrupting combustion. Because red phosphorus requires a smaller amount to achieve the same flame retardancy requirements, and because red phosphorus has a high melting point and poor solubility, the physical properties of polymers flame-retarded with red phosphorus are better than those of similar polymers made with common flame retardants. Red phosphorus combined with halogenated flame retardants can improve flame retardancy efficiency. Red phosphorus can also be used to manufacture matches, fireworks, and aluminum phosphide, phosphorus pentoxide, and phosphorus trichloride. It is a raw material for the production of organophosphorus pesticides. In the metallurgical industry, it is used to manufacture phosphorus bronze sheets. It is also used for desulfurization of light metals and in pharmaceuticals. It is used in organic synthesis.
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Key words:
Qingli Tianmeng Chemical, yellow phosphorus, formic acid, sodium formate, perphosphoric acid, sodium tripolyphosphate, sodium hexametaphosphate
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