For Research and Development scientists in the chemical and materials industries, a deep understanding of raw material properties is fundamental to successful product innovation. Diisononyl Phthalate (DINP) is a critical plasticizer, and its chemical characteristics dictate its performance in various polymer applications, particularly PVC. This guide provides an overview of DINP's key chemical properties for R&D professionals.

DINP, chemically known as 1,2-Benzenedicarboxylic acid, di-C8-10 branched alkyl esters, C9 rich, is a diester of phthalic acid and isononanol. The molecular formula is C26H42O4, with a molecular weight of approximately 418.6 g/mol. Its structure, being a mixture of branched isomers, contributes to its excellent compatibility and performance characteristics.

Appearance and Physical State: DINP is typically described as a clear, colorless to pale yellow, oily liquid. This liquid form at room temperature is a direct result of its molecular structure and relatively low melting point, which is around -43°C to -54°C, depending on the specific isomer mixture. This low freezing point is advantageous for storage and handling in colder climates.

Solubility and Compatibility: A key property for any plasticizer is its compatibility with the polymer matrix. DINP exhibits excellent compatibility with PVC, meaning it readily mixes with the polymer to form a homogeneous compound. It is insoluble in water but soluble in most common organic solvents, including alcohols, ethers, and hydrocarbons. This solubility profile is important for formulation and processing.

Viscosity and Density: The viscosity of DINP is an important factor in processing. Typically, its viscosity is in the range of 64-265 mPa·s at 20°C. This viscosity, along with its density (around 0.97-0.98 g/cm³ at 20°C), influences how it is handled, metered, and dispersed within a polymer compound during manufacturing. Lower viscosity generally aids in better processing efficiency.

Volatility and Migration: DINP is characterized by low volatility compared to shorter-chain phthalates like DOP. This means it is less likely to evaporate from the plastic material during processing or use, contributing to the product’s longevity and consistent properties. Similarly, its low migration rate ensures it remains within the polymer matrix, crucial for applications where leaching could be a concern, such as in food contact materials (within regulated limits) or children's products.

Thermal Properties: DINP has a high flash point, typically above 216°C, indicating good thermal stability during processing. This high flash point reduces fire hazards during manufacturing and contributes to the overall thermal resistance of the plasticized product.

For R&D scientists looking to purchase DINP, sourcing from a reliable manufacturer that can provide detailed specifications and batch-to-batch consistency is vital. Understanding these chemical properties allows for accurate prediction of performance in new formulations and troubleshooting of existing products. We are a dedicated DINP supplier committed to providing high-quality products with comprehensive technical data to support your research and development efforts.