What are the flame retardant mechanisms of 7031 electrical polyester fiber nonwoven fabric?

2026-01-05 15:00:52

The flame-retardant properties of 7031 electrical polyester fiber nonwoven fabric are primarily achieved through the material's chemical composition and physical structure. Polyester fiber itself possesses a certain degree of flame retardancy, but this can be further enhanced by adding flame retardants. At high temperatures, flame retardants decompose and release flame-retardant gases, such as nitrogen or carbon dioxide. These gases dilute the concentration of flammable gases, inhibiting the spread of flames. Simultaneously, flame retardants promote the formation of a char layer, which isolates oxygen and heat, preventing the combustion reaction from continuing. The stability of the char layer is crucial for the flame-retardant effect; high-quality flame retardants can form a dense and resistant char layer.

The physical structure of the nonwoven fabric also plays a significant role in the flame-retardant mechanism. The loose arrangement between fibers slows the spread of flames, as it takes more time for the flame to ignite adjacent fibers. Furthermore, the porous structure of the nonwoven fabric facilitates heat dissipation, reducing heat accumulation within the material and thus lowering the likelihood of combustion. The diameter and length of the fibers also affect flame-retardant performance; finer fibers are more easily ignited, but this deficiency can be compensated for by adding flame retardants and optimizing the structure.

7031 electrical polyester fiber nonwoven fabric does not produce molten droplets during combustion, another important characteristic of its flame-retardant properties. Molten droplets are common in many synthetic fibers, leading to secondary flame propagation and increasing fire risk. However, with the help of flame retardants, polyester fibers form a stable char layer during combustion, preventing molten droplets. This characteristic is particularly important in electrical equipment, as molten droplets can cause short circuits or other safety hazards.

The flame-retardant properties of the material are also closely related to its thermal stability. 7031 electrical polyester fiber nonwoven fabric maintains structural stability at high temperatures, without rapidly decomposing or softening. This thermal stability ensures that the material effectively resists flame erosion in the early stages of a fire, buying time for evacuation and equipment protection. Furthermore, the material's antioxidant properties also contribute to flame retardancy, as oxidation is a crucial component of combustion, and materials with strong antioxidant properties can slow down the combustion process.

The durability of its flame-retardant properties is another important characteristic of 7031 electrical polyester fiber nonwoven fabric. High-quality flame retardants are tightly bonded to the polyester fibers and are not easily lost due to environmental factors such as humidity or ultraviolet radiation. This allows the material's flame-retardant properties to remain stable over long-term use, without significant degradation over time. Therefore, the application of 7031 electrical polyester fiber nonwoven fabric in electrical equipment provides reliable fire protection.