Acetates & Esters, High-Purity Solvents

Phthalate Esters (e.g., DOP, DBP) Various

Phthalate esters are esters of phthalic acid and are mainly used as plasticizers, which are substances added to plastics to increase their flexibility, transparency, durability, and longevity. Among these, Di(2-ethylhexyl) phthalate (DOP), also known as DEHP, stands out as the most widely used representative within the global industrial landscape. Chemically, these compounds are characterized by a benzene ring with two ester groups attached at the ortho position, conferring unique physical properties such as low volatility and high stability. They appear as colorless, odorless, oily liquids that exhibit high solubility in organic solvents but remains largely insoluble in water. Due to their non-polar nature, phthalates efficiently intersperse between polymer chains, reducing intermolecular forces and enhancing the material’s overall workability. Despite their utility, they are subject to strict regulatory scrutiny due to concerns regarding leaching and potential endocrine-disrupting effects in biological systems, necessitating precise handling and specific formulation strategies. This ensures safety.

Attributes

Key Features and Benefits

Superior Plasticizing Efficiency: Phthalates provide exceptional internal lubrication for PVC, significantly lowering the glass transition temperature and improving mechanical elasticity.
Low Volatility and Resistance: These esters possess a low vapor pressure and high boiling point, ensuring that plastic products maintain their flexibility over time.
Excellent Material Compatibility: Their non-polar chemical structure allows for seamless integration with various polymers, resulting in clear, uniform, and stable material blends.
Enhanced Weathering Resistance: Phthalates contribute to the UV stability and moisture resistance of end products, preventing cracking or degradation in harsh outdoor environments.
Cost-Effectiveness and Versatility: They remain the most economical choice for bulk plasticizing, offering a balance of performance characteristics suitable for diverse manufacturing processes.

Specifications

Technical Highlights

Molecular Weight and CAS: For Bis(2-ethylhexyl) phthalate (DOP), the molecular weight is 390.56 g/mol, and the CAS Registry Number is 117-81-7.
Density and Refractive Index: The compound exhibits a specific gravity of approximately 0.985 g/cm³ at 20°C and a refractive index of 1.485.
Flash and Boiling Points: DOP has a high flash point of approximately 215°C (closed cup) and a boiling point of 385°C at atmospheric pressure.
Viscosity Profile: It maintains a dynamic viscosity of roughly 80 mPa·s at 20°C, facilitating easy pumping and mixing during industrial polymer extrusion.
Water Solubility and Purity: Industrial grade phthalates typically maintain a purity above 99.5%, with water solubility as low as 0.003 mg/L at 25°C.