What is the design principle of the insulation layer of pvc flexible cord

PVC (polyvinyl chloride), as a material widely used in cable insulation, is favored for its superior mechanical strength and chemical resistance. PVC has good acid, alkali and oil resistance, is not easy to burn, and has excellent process performance, which makes it an ideal choice for the cable manufacturing industry. However, there are polar groups in the molecular structure of PVC, which leads to certain deficiencies in its insulation resistivity, dielectric loss, heat resistance, thermal stability and cold resistance. Therefore, when designing the insulation layer of PVC Flexible Cord, it is particularly important to improve and optimize these defects.

In terms of material selection, in order to improve the insulation performance of PVC, plasticizers and insulation improvers are usually introduced. The role of plasticizers is to weaken the interaction between PVC molecules, thereby reducing its softening temperature, reducing melt viscosity and enhancing fluidity. This improvement not only optimizes the processing performance of PVC, but also improves the flexibility of the product. In addition, the addition of plasticizers can improve the insulation resistivity and dielectric properties of PVC to a certain extent. Insulation improvers further enhance the insulation properties of PVC, enabling it to meet the needs of specific application scenarios.

In terms of structural design, the PVC Flexible Cord insulation layer usually adopts multi-layer co-extrusion technology. This technology can effectively combine PVC materials with different properties to form an insulation layer with a multi-layer structure. For example, the inner layer can use PVC materials with excellent insulation properties to ensure good isolation between the cable core and the insulation layer; the outer layer can use PVC materials with good wear resistance and weather resistance to protect the insulation layer from the external environment.

Performance optimization is another important aspect of the design of the PVC Flexible Cord insulation layer. In order to improve the heat resistance of PVC, heat stabilizers can be added to its formula to resist the decomposition and aging of PVC at high temperatures. In addition, in order to enhance the cold resistance of PVC, PVC resins with lower glass transition temperatures can be selected, or the type and amount of plasticizers can be adjusted to achieve this goal.

When considering the flame retardant properties of cables, although PVC itself has certain flame retardant properties, combustion may still occur under certain conditions. Therefore, introducing flame retardants in the insulation layer design is an effective means to improve the flame retardant properties of cables. Flame retardants decompose and release flame retardant gases at high temperatures, thereby diluting the concentration of flammable gases and effectively preventing the spread of flames.