Polyester cotton is a kind of polyester fiber. It is a synthetic material. Its characteristics are delicate, soft, comfortable, and elastic. Many clothing manufacturers use it in jeans, but in fact, polyester Cotton is also widely used in the flame retardant field.

Conventional polyester cotton has a limiting oxygen index of 20-22 (the oxygen concentration in the air is 21%), which is a kind of combustible fiber, which is easy to ignite but has a slower burning speed. At the same time, polyester cotton has the characteristic of shrinking when encountering high heat. When the fiber encounters a flame, it is difficult to ignite due to shrinkage and separation from the flame, resulting in an appropriate flame-retardant effect. In addition, the polyester cotton will melt and drip when it encounters high heat. The melting and dripping phenomenon of the polyester cotton after ignition can also take away part of the heat and flame to produce an appropriate flame-retardant effect. However, if the fiber is stained with oil that is easy to support combustion or use silicone oil that can set the polyester cotton, the polyester cotton will reduce the flame-retardant effect. Especially when polyester cotton containing SILICONE oil agent encounters flame, the fiber cannot shrink and burn.

Of course, many manufacturers will use some technological means to improve the flame retardancy of polyester cotton:
1. If the polyester slices are modified and denatured to have a flame-retardant effect. Most of the long-lasting flame-retardant fibers use modified polyester chips to produce flame-retardant polyester cotton. The main modifier is phosphorus series compounds. Phosphorus will combine with oxygen in the air under high heat to reduce the oxygen content. The flame retardant effect.

2. The method to make polyester cotton flame-retardant is surface treatment. This kind of product is thought to reduce the flame-retardant effect after the treatment agent is processed many times.

3. The method of increasing the flame retardancy of polyester cotton, in addition to using flame-retardant modified polyester chips to produce polyester cotton, the use of an oil agent with a higher phosphate content on the surface of the fiber as a post-treatment can also increase the flame retardant effect of the fiber. Because the phosphorous molecules released by phosphate encountering high heat will combine with oxygen molecules in the air and reduce the oxygen content in the air at the same time, so as to increase the flame-retardant properties.
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