Flame-retardant short fiber flame-retardant mechanism:

(1) Endothermic effect. Flame retardants with high heat capacity will undergo endothermic reactions such as phase change, dehydration or dehydrohalogenation at high temperatures, reducing the temperature of the fiber material surface and flame zone, slowing down the rate of thermal cracking reaction, and inhibiting the generation of combustible gases.

(2) Cover protection. After the flame retardant is heated, it melts on the surface of the fiber material to form a glass-like covering layer, which becomes a barrier between the condensed phase and the flame. It not only insulates oxygen, prevents the diffusion of combustible gases, but also blocks heat conduction and heat radiation, reduces the heat feedback to the fiber material, thereby inhibiting thermal cracking and combustion reactions.

(3) Gas dilution effect. The endothermic decomposition of the flame retardant releases incombustible gases such as nitrogen, carbon dioxide, sulfur dioxide and ammonia, which dilute the flammable gas concentration at the cracking site of the fiber material to below the combustion limit. Or the oxygen in some areas at the center of the flame is insufficient to prevent the combustion from continuing. In addition, this non-combustible gas also has the effect of heat dissipation and temperature reduction. The order of their flame retardant effect is: N2>CO2>SO2>NH3.

(4) Condensed phase flame retardant. Through the action of the flame retardant, the thermal cracking reaction process of the fiber macromolecular chain is changed in the condensed phase reaction zone, and the reactions such as dehydration, condensation, cyclization, and crosslinking are promoted until carbonization, so as to increase the carbonization residue and reduce the combustible gas. Produce, make the flame retardant play a flame retardant effect in the condensed phase. The effect of the condensed phase flame retardant is closely related to whether the flame retardant matches the chemical structure of the fiber.

(5) Gas phase flame retardant. Add a small amount of inhibitor to capture a large amount of light free radicals and hydrogen free radicals in the flame zone, reduce the concentration of free radicals, thereby inhibit or interrupt the chain reaction of combustion, and play a flame retardant effect in the gas phase. The gas phase flame retardant effect is not sensitive to the chemical structure of the fiber material.

(6) The surface effect of particles. If there is a certain amount of inert particles mixed with combustible gas, it can not only absorb the heat of combustion and lower the flame temperature, but also, like the wall surface of the container, on the surface of the particles, a large amount of high-energy hydrogen radicals in the gas phase combustion reaction , Transform into low-energy hydroperoxy radicals, thereby inhibiting gas phase combustion.

(7) Droplet effect: Some thermoplastic synthetic fibers, such as polyamide and polyester, shrink when heated, and the contact area with the air is reduced. Even the droplets fall and leave the fire source, causing the combustion to be affected to a certain extent. Hinder.

Characteristics of flame-retardant short fiber:

1. Good security. The fiber does not melt when exposed to fire, and the low smoke does not release poisonous gas.

2. Permanent flame retardant effect. Washing and friction will not affect the flame retardant performance.

3. Environmental protection. With natural cellulose fiber as the carrier, the waste can be degraded naturally, which meets the requirements of environmental protection.

4. Excellent permanent flame retardant and fireproof performance. Flame-retardant short fiber has good performance in preventing flame spread, smoke release, anti-melting, and durability.

5. Good heat insulation and anti-static performance. Provide full thermal protection.

6. Theflame-retardant short fiber has the characteristics of natural fiber. The fabric has the moisture absorption and release properties of natural fibers, and the fabric has the characteristics of soft hand feeling, comfort, breathability, and bright dyeing.