Tris(nonylphenyl) Phosphite (TNPP), identified by CAS number 3050-88-2, is a sophisticated organophosphorus compound renowned for its exceptional antioxidant capabilities. As a secondary antioxidant, it plays a pivotal role in protecting polymers from degradation caused by heat and oxidation. Understanding its chemical nature, physical properties, and manufacturing processes is key for R&D scientists and procurement managers seeking to optimize material performance. If you are considering to buy this vital chemical, a thorough understanding of its attributes is beneficial.

At NINGBO INNO PHARMCHEM CO.,LTD., we are dedicated to providing comprehensive information about the chemicals we supply. This article aims to offer an in-depth look at TNPP, its characteristic properties, and the manufacturing considerations that ensure its high performance. As a leading supplier, we empower our clients with knowledge to make informed decisions when they need to purchase essential additives.

Chemical Composition and Structure

The chemical formula for Tris(nonylphenyl) Phosphite is C45H69O3P, with a molecular weight of approximately 689 g/mol. Its structure consists of a central phosphorus atom bonded to three nonylphenol groups. The nonyl chain, a nine-carbon alkyl group, imparts lipophilicity and compatibility with various organic matrices, including plastics and rubbers. The phosphite ester linkage is the active functional group responsible for its antioxidant activity.

Key Physical and Chemical Properties

TNPP exhibits a unique set of physical and chemical properties that make it highly suitable for polymer stabilization:

  • Appearance: Typically described as a light yellow to colorless viscous liquid or solid, depending on purity and temperature.
  • Boiling Point: It has a high boiling point, often cited as greater than 360 °C (lit.), indicating low volatility.
  • Density: Approximately 0.99 g/mL at 25 °C (lit.).
  • Refractive Index: Around 1.5220-1.5265 (n20/D), signifying its optical properties.
  • Viscosity: Ranges from 2500-5000 mPa·s at 20 °C, characterizing its flow behavior.
  • Solubility: Soluble in common organic solvents, facilitating its incorporation into various polymer formulations.
  • Hydrolytic Stability: Generally good, though prolonged exposure to moisture at elevated temperatures can lead to hydrolysis.

Manufacturing Process Insights

The synthesis of Tris(nonylphenyl) Phosphite typically involves the reaction of phosphorus trichloride (PCl3) with nonylphenol. The reaction is an esterification process where the hydroxyl groups of nonylphenol displace the chlorine atoms on phosphorus. Careful control of reaction conditions, stoichiometry, temperature, and purification steps are crucial to achieve high purity and yield, minimizing by-products such as incompletely reacted phosphites or phenolic impurities.

Manufacturers often employ techniques to remove residual reactants and by-products, ensuring the final product meets the stringent specifications required for polymer applications. The process might involve vacuum distillation or other purification methods. When you buy TNPP, ensuring it comes from a manufacturer with robust quality control procedures is paramount.

Applications and Advantages

TNPP is a vital additive for enhancing the thermal oxidative stability of polymers. Its role in chelating metal ions prevents catalytic degradation, improving heat resistance and initial color. It is widely used in plastics (PVC, polyolefins, ABS), rubbers, and latex products. Its non-toxic and odorless nature, coupled with solvent extraction resistance, makes it a preferred choice for sensitive applications like food packaging.

Sourcing Premium TNPP from NINGBO INNO PHARMCHEM CO.,LTD.

NINGBO INNO PHARMCHEM CO.,LTD. is committed to providing premium Tris(nonylphenyl) Phosphite, manufactured under strict quality controls. Our expertise as a supplier ensures that you receive a product with consistent purity and performance characteristics. If you are looking to buy TNPP to enhance the longevity and stability of your polymeric materials, we are your trusted partner. Contact us today for detailed specifications, pricing, and to request a sample. Let us help you achieve superior product performance through high-quality chemical solutions.