English
中文简体Understanding the Chemical Properties of Dioctyl Phthalate
Dioctyl Phthalate, commonly referred to as DOP or DEHP (Bis(2-ethylhexyl) phthalate), is a colorless and odorless liquid that serves as one of the most widely used plasticizers in the world. Its chemical structure allows it to integrate seamlessly into polymer chains, specifically Polyvinyl Chloride (PVC), to transform brittle plastic into a flexible, durable, and workable material. Because it is non-volatile and possesses a high boiling point, DOP remains stable under various manufacturing temperatures, making it a reliable choice for high-volume industrial production.
The primary function of DOP is to reduce the glass transition temperature of plastics. By increasing the distance between polymer chains, it allows them to slide past one another more easily. This molecular lubrication is what gives PVC products their characteristic softness, whether in the form of thin medical tubing or heavy-duty industrial floorings. Its excellent electrical resistance and low temperature flexibility further extend its utility into specialized technical fields.
Primary Industrial Applications and Use Cases
DOP is the backbone of the flexible PVC industry. Its versatility allows it to be used in everything from consumer goods to critical infrastructure. In the construction sector, it is essential for producing waterproof membranes, wires, and cables. In the automotive industry, it is used for underbody coatings and interior trim components that must withstand varying environmental stresses without cracking or losing their shape.
Beyond construction, DOP plays a significant role in the following areas:
- Medical Devices: Used in blood bags and enteral nutrition feeding tubes due to its compatibility with various sterilization methods.
- Consumer Electronics: Acting as an insulator for power cords and internal wiring to prevent electrical shorts.
- Footwear and Apparel: Providing the necessary elasticity for PVC-based rain boots and synthetic leather fabrics.
Technical Specifications and Physical Constants
When sourcing or formulating with Dioctyl Phthalate, understanding its technical parameters is vital for quality control. The following table outlines the standard physical properties typically found in high-purity industrial grade DOP:
| Property | Value / Description |
| Molecular Formula | C24H38O4 |
| Density at 20°C | 0.981–0.987 g/cm³ |
| Boiling Point | 384.9°C at 760 mmHg |
| Flash Point | 206°C |
| Solubility in Water | < 0.01 g/100 mL (Insoluble) |
