Naphthol AS-KB (CAS: 135-63-7) is a chemical compound recognized for its significant role in the chemical industry, primarily as a key intermediate in the synthesis of organic pigments and as a component in textile dyeing. This article aims to provide a detailed overview of its properties, applications, and the considerations for procurement.

Understanding Naphthol AS-KB

The chemical name for Naphthol AS-KB is N-(5-Chloro-2-methylphenyl)-3-hydroxynaphthalene-2-carboxamide. It is a light yellow powder with a molecular formula of C18H14ClNO2 and a molecular weight of approximately 311.76 g/mol. Key physical and chemical properties include:

• Appearance: Light yellow powder.
• Melting Point: Typically around 240-244°C.
• Purity: Generally specified as ≥98.0%.
• Solubility: Soluble in organic solvents like Tetrahydrofuran.
• Density: Around 1.36 g/cm³.

These properties make it a stable and versatile compound for various chemical reactions.

Primary Applications

The utility of Naphthol AS-KB spans two major industrial sectors:

1. Organic Pigment Manufacturing: Naphthol AS-KB serves as a critical coupling component in the production of specific azo pigments. It reacts with diazo components to form insoluble pigments such as Pigment Red 11, Pigment Red 147, and Pigment Red 162. These pigments are widely used in inks, paints, plastics, and coatings, valued for their bright hues and durability.
2. Textile Dyeing: In the textile industry, Naphthol AS-KB is employed as a coupling agent for dyeing cellulosic fibers (like cotton and viscose) and silk. It enables the formation of insoluble azo dyes directly on the fiber, leading to excellent wash fastness and good overall durability of the color. The process often involves specific temperature and pH controls to achieve optimal results.

Procurement Considerations: Where to Buy

When seeking to buy Naphthol AS-KB, potential customers should look for manufacturers and suppliers who can guarantee high purity and consistent quality. Key factors to consider when purchasing include:

• Supplier Reputation: Opt for established companies with a strong track record in chemical manufacturing and supply.
• Product Specifications: Ensure the supplier provides detailed specifications, including purity levels (≥98.0%), melting point, and other relevant technical data. A Certificate of Analysis (COA) is essential for quality verification.
• Packaging: Standard packaging, such as 25kg drums, is common and helps maintain product integrity.
• Pricing and Availability: Compare prices from different suppliers, especially for bulk orders, and confirm the availability of stock.

NINGBO INNO PHARMCHEM CO.,LTD. is a manufacturer and supplier of Naphthol AS-KB based in China. They offer this intermediate with a focus on purity and reliable supply, catering to global industrial needs. Engaging with such suppliers ensures access to quality materials essential for the production of vibrant pigments and durable textile dyes. By understanding the technical requirements and sourcing from trustworthy manufacturers, businesses can effectively utilize Naphthol AS-KB in their production processes.