火災(zāi)的危害可想而知，因素在一些建筑材料表面要使用防火涂料。防火涂料是一種用于可燃性基材表面，能降低被涂材料表面的可燃性，阻礙火災(zāi)的迅速蔓延，用以提高被涂材料耐火極限的一種特種涂料。防火涂料它除了具有阻燃作用以外，還具有防水、防銹、防腐、耐熱、耐磨以及涂層堅韌性、黏附性、著色性、易干性和一定的光澤等性能。
其實防火涂料本身具有難燃性或不燃性，使被保護基材不直接與空氣接觸，延遲物體著火和減少燃燒的速度；它的導(dǎo)熱系數(shù)也很低，可以延遲火焰溫度向被保護基材的傳遞。防火涂料受熱分解出不燃惰性氣體，沖淡被保護物體受熱分解出的可燃性氣體，使之不易燃燒或燃燒速度減慢。這樣燃燒的產(chǎn)生和進行必須同時具備三個條件，即可燃物質(zhì)、助燃劑和火源被切斷了。
含氮的防火涂料受熱分解出NO、NH3等基團，與有機游離基化合，中斷連鎖反應(yīng)，降低溫度。膨脹型防火涂料受熱膨脹發(fā)泡，形成碳質(zhì)泡沫隔熱層封閉被保護的物體，延遲熱量與基材的傳遞，阻止物體著火燃燒或因溫度升高而造成的強度下降。
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中譯英：
Fire hazard factors one can imagine, in some building materials surface to use fire retardant coating. Fire retardant coating is used with a combustible base surface, can reduce the coated material on the surface of the combustible, hinder the fire spread rapidly, in order to improve coated refractory limit of a special coating. It has a flame retardant effect, also has waterproof, anti-corrosion, rust-proof, heat-resistant, wear-resistant and tough coating, adhesion, color, easy to dry and certain luster properties.
In fact, fire retardant coating itself is flame resistant or incombustible, that is to protect the substrate does not directly contact with air, delay object on fire and reduce the rate of burning; its thermal conductivity is low, can delay the flame temperature to be protecting a substrate transfer. Fire retardant coating of thermal decomposition of a non-flammable inert gas, dilute the protected object heating decomposition of combustible gas, so easy to combustion or burning velocity. Such burning generating and must have three conditions, namely the combustible material, combustion-supporting agent and fire was cut off. |
