p-Phenylenediamine (PPD), identified by its CAS number 106-50-3, is a chemical compound known for its distinctive properties and a broad spectrum of industrial applications. Understanding these characteristics is fundamental to appreciating its role in various manufacturing processes.

Chemically, p-Phenylenediamine is an aromatic amine, an organic compound featuring two amino groups attached to a benzene ring at opposite positions (para-position). This structure imparts specific reactivity, making it susceptible to oxidation, which leads to its characteristic darkening upon exposure to air. The pure product is typically a white to purple crystalline solid, but commercial samples can appear off-white to dark brown due to this oxidation process. Its melting point is around 139-143°C, and it boils at 267°C. PPD exhibits good solubility in alcohol, ether, chloroform, and benzene, but limited solubility in cold water.

The diverse uses of p-Phenylenediamine stem directly from its chemical properties. As a key p-Phenylenediamine chemical intermediate, it is extensively used in the synthesis of various dyes, including azo dyes, sulfur dyes, and fur dyes. Its ability to act as a developing agent in photography also highlights its redox properties. In the rubber industry, derivatives of PPD are employed as antioxidants and antiozonants, significantly improving the durability and lifespan of rubber products.

The p-Phenylenediamine industrial applications also extend to the production of high-performance polymers, as mentioned earlier, where it serves as a monomer for materials like Kevlar. Furthermore, it finds use as a gasoline polymerization inhibitor and a reagent in certain laboratory tests.

NINGBO INNO PHARMCHEM CO.,LTD. provides high-purity p-Phenylenediamine to meet the demanding requirements of these industries. Understanding the chemical behavior of PPD, such as its tendency to oxidize and its reactivity with other compounds, is essential for its safe and effective handling and application. The compound's multifaceted nature ensures its continued importance across a wide range of chemical manufacturing sectors.