What are the flame retardant methods?
What are the flame retardant methods?
Textile fibers are basically flammable substances and are pyrolyzed at ~300°C. The pyrolysis products are mixed with air and are flammable, self-igniting or burning with open fire.
Flame retardant finishing: Prevents the fabric from burning. Or slow down the burning of textiles and leave the flames without burning.
The flammability of textiles:
There are physical and chemical changes in the textile burning process.
Combustion mode
Fiber thermal cracking
Fiber Thermal Properties Physical Specifications
Glass transition temperature (Tg): Low—thermoplastic fiber, Tg, Tm<Tp, Tc. Heated before combustion, first softened, shrunk, melted, and then cracked and burned. It is difficult to continue burning due to dripping of molten material during combustion, but high temperature droplets adhere to the skin and cause deep burns.
High—non-thermoplastic fibers, such as natural fibers, high-temperature resistant fibers, Tg, Tm>Tp, and Tc, are directly cracked and burned when heated to a high temperature.
Melting temperature (Tm)
Thermal cracking temperature (Tp)
Burning temperature (Tc)
Aerobic Index LOI
Textile burning aerobic index (limited oxygen index): LOI
Refers to the minimum volume fraction of O2 that the textile must maintain in a candle-like combustion in a mixture of N2 and O2. LOI=O2/N2+O2×100% aerobic index,
Big - hard to burn. >21% (proportion of oxygen in air)
Small - flammable. <21%
Burning skeleton effect:
Also known as the candle flame core effect.
When a blended fabric such as a polyester/cotton fabric is burned, the carbonization of non-thermoplastic fibers acts as a skeleton for the melting of the thermoplastic fibers, and the melt does not drip and adhere to the skeleton to burn, as if the candle burns. Therefore, flame retardancy of blended fabrics is very difficult.
Flame retardant method
Flame retardant textiles suppress the entire process of combustion. The method is as follows:
1) Control the thermal decomposition products of the textile so that the decomposition products become incombustible products and solid residues.
2) The gas generated by thermal cracking is a large amount of non-combustible gas, such as water, SO2, and CO2, which dilutes flammable gas.
3) Interference, stop the redox reaction of the combustion flame, extinguish the flame.
4) Form a barrier layer to prevent heat and combustible gases from passing between the flame and the fabric.
How to buy good quality and cheap flame retardant fabrics, fluorescent fabrics, three functional fabrics Teflon and other functional fabrics?
Choose Xinxiang Yu Long Textile Co., Ltd. , we will provide you with the best fabrics, we will also provide you with the supply of flame retardant overalls.
Textile fibers are basically flammable substances and are pyrolyzed at ~300°C. The pyrolysis products are mixed with air and are flammable, self-igniting or burning with open fire.
Flame retardant finishing: Prevents the fabric from burning. Or slow down the burning of textiles and leave the flames without burning.
The flammability of textiles:
There are physical and chemical changes in the textile burning process.
Combustion mode
Fiber thermal cracking
Fiber Thermal Properties Physical Specifications
Glass transition temperature (Tg): Low—thermoplastic fiber, Tg, Tm<Tp, Tc. Heated before combustion, first softened, shrunk, melted, and then cracked and burned. It is difficult to continue burning due to dripping of molten material during combustion, but high temperature droplets adhere to the skin and cause deep burns.
High—non-thermoplastic fibers, such as natural fibers, high-temperature resistant fibers, Tg, Tm>Tp, and Tc, are directly cracked and burned when heated to a high temperature.
Melting temperature (Tm)
Thermal cracking temperature (Tp)
Burning temperature (Tc)
Aerobic Index LOI
Textile burning aerobic index (limited oxygen index): LOI
Refers to the minimum volume fraction of O2 that the textile must maintain in a candle-like combustion in a mixture of N2 and O2. LOI=O2/N2+O2×100% aerobic index,
Big - hard to burn. >21% (proportion of oxygen in air)
Small - flammable. <21%
Burning skeleton effect:
Also known as the candle flame core effect.
When a blended fabric such as a polyester/cotton fabric is burned, the carbonization of non-thermoplastic fibers acts as a skeleton for the melting of the thermoplastic fibers, and the melt does not drip and adhere to the skeleton to burn, as if the candle burns. Therefore, flame retardancy of blended fabrics is very difficult.
Flame retardant method
Flame retardant textiles suppress the entire process of combustion. The method is as follows:
1) Control the thermal decomposition products of the textile so that the decomposition products become incombustible products and solid residues.
2) The gas generated by thermal cracking is a large amount of non-combustible gas, such as water, SO2, and CO2, which dilutes flammable gas.
3) Interference, stop the redox reaction of the combustion flame, extinguish the flame.
4) Form a barrier layer to prevent heat and combustible gases from passing between the flame and the fabric.
How to buy good quality and cheap flame retardant fabrics, fluorescent fabrics, three functional fabrics Teflon and other functional fabrics?
Choose Xinxiang Yu Long Textile Co., Ltd. , we will provide you with the best fabrics, we will also provide you with the supply of flame retardant overalls.
评论
发表评论