- 本站编辑：杭州纳尔森精细化工有限公司发布日期：2018-06-22 21:37 浏览次数：
The textile itself is easy to burn and facilitate the spread of the flame, and the general combustible must have three elements: the actual temperature, the combustible gas and the oxygen, and the lack of any one element, and the combustion can not go on.
Textile flame retardants can control the combustion by changing the thermal decomposition of the fibers to play the role of flame retardancy.
There are two directions for the cracking reaction of cellulose fibers after heating (combustion): one is dehydrated carbonization of cellulose, producing water, carbon dioxide and solid residue (this is not the cause of continuous combustion); the two is that cellulose is depolymerization to produce nonvolatile liquid left glucose, and left glucose is further cracked to produce low molecular weight. The amount of the pyrolysis products and the ion of two cokes. There are no lack of alcohols, ethers, ketones and aldehydes in these low-molecular-weight cracking products. In the presence of oxygen, oxidation occurs in the presence of oxygen, producing a large amount of heat and causing more cellulosic cracking. Moreover, the gasification of low molecular substances accelerated the spread of flame. These two reactions compete with each other and always exist in the whole process of cellulose pyrolysis. After flame-retardant finishing, phosphorus containing flame retardant produces phosphoric anhydride or phosphoric acid during the combustion process, which can catalyze the dehydration and carbonization of cellulose, prevent the ion of left-handed glucose, thus reduce the production of flammable cracking products and increase the amount of water, carbon dioxide and solid residue, even if some of them are flammable. The pyrolysis products, which are produced by the phosphoric acid decomposed by flame retardants, will also become substances with larger carbonization tendency. Due to the reduction of flammable cracking products and the absorption of some heat from the flame retardant, the heat release of the flame retardant fabric is greatly reduced, and the continuous cracking of the fiber is delayed. So when the fire is gone, it can be extinguished automatically.