P-Phenylenediamine PPD CAS 106-50-3 is white to purple crystalline solid (melting point 234 F) that turns purple to black in air. Toxic by skin absorption, inhalation or ingestion. It exists in Flakes,Lump and Powder. It is mainly used as a component of engineering polymers and composites. It is also an ingredient in hair dyes.

Specification

Application

Precursor to polymers

PPD is a precursor to aramid plastics and fibers such as Kevlar. These applications exploit PPD's difunctionality, i.e. the presence of two amines which allow the molecules to be strung together. This polymer arises from the reaction of PPD and terephthaloyl chloride. The reaction of PPD with phosgene gives the diisocyanate, a precursor to urethane polymers.

Dyeing

PPD is a common hair dye. Its use is being supplanted by other aniline analogues and derivatives such as 2,5-diamino(hydroxyethylbenzene and 2,5-diaminotoluene. Other popular derivatives include tetraaminopyrimidine and indoanilines and indophenols. Derivatives of diaminopyrazole give red and violet colours. In these applications, the nearly colourless dye precursor oxidizes to the dye.

Rubber antioxidant

PPD is easily oxidized, and for this reason derivatives of PPD are used as antiozonants in production of rubber products. The substituents, naphthyl, isopropyl etc. affect the effectiveness of their antioxidant roles as well as their properties as skin irritants.

Other uses

Packing

25 kgs/Fiber drumx440 drums=11 tons/1x20' FCL without pallets (25KG open drum 380X480mm)

Storage

Placed in sealed container and kept in a cool and dry place.