DINP

1. Basic Chemical Properties

• Chemical Formula: C26​H42​O4​
• Molecular Structure: Ester formed by the reaction of phthalic anhydride and isononyl alcohol (a branched 9-carbon alcohol).
• Physical Appearance: Colorless to pale yellow viscous oily liquid at room temperature; insoluble in water, miscible with most organic solvents (e.g., esters, ketones, hydrocarbons) and compatible with PVC resins.
• Key Characteristics: Low volatility, good cold resistance, excellent compatibility with PVC, and high plasticizing efficiency.

2. Main Applications

• Flexible PVC Products: Wire and cable insulation, PVC films, artificial leather, floor mats, hoses, and sealing strips. Its low volatility makes it suitable for products that require long-term use at moderate temperatures.
• Semi-rigid PVC Products: Plastic profiles, pipe fittings, and daily necessities, where it balances product hardness and flexibility.
• Non-PVC Applications: Can be used as a plasticizer for some synthetic rubbers (e.g., nitrile rubber) to improve processability and elasticity.

3. Regulatory and Safety Considerations

• DINP is a phthalate plasticizer, and its safety has been the subject of regulatory attention globally. Compared with short-chain phthalates (e.g., DEHP, DBP), it has lower migration rates and relatively lower toxicity risks.
• It complies with many regional standards for general-purpose PVC products, but restrictions apply in products for children’s toys and food contact materials in the EU (REACH regulation) and other regions. For these sensitive applications, phthalate-free alternatives (e.g., DOTP, DOA) are preferred.

4. Differences from DOTP