纳米ATH改性饰面型防火涂料的规律及阻燃机理研究

发布时间：2018-04-19 23:42

  本文选题：膨胀型防火涂料 + 阻燃体系　； 参考：《重庆科技学院》2017年硕士论文

【摘要】：当前,各类建筑物中越来越广泛的使用可燃、易燃的高分子聚合物材料,导致火灾频发且常有重大火灾发生。对建筑物基材施涂防火涂料,是目前被广泛应用的一种防火保护方法。本论文以水性膨胀饰面型防火涂料为研究对象,分别向基础涂料中加入不同粒径和加量的纳米氢氧化铝(ATH)阻燃剂,研究纳米ATH对防火涂料的影响规律和阻燃机理。主要开展了:1)确定基础配方组分,通过正交试验设计优化防火涂料基础配方;2)在防火涂料中添加不同粒径不同比例的纳米ATH,分别测试各防火涂料样品的部分理化性能和燃烧性能,并对结果进行分析;3)对高温分解后形成的膨胀炭质层进行扫描电镜分析和红外分析,对防火涂料的热解过程进行热重分析,结合实验研究结果,分析纳米ATH阻燃剂对防火涂料的影响规律和阻燃机理。现得到以下结论:在确定防火涂料配方中基本组分的基础上,采用()49L3正交试验设计方法对乳液及膨胀阻燃体系进行优化,结合点燃时间测试结果分析得到阻燃效果最优的涂料配方,该配方防火涂料在热辐射强度为302/mkW,温度为625℃条件下,其点燃时间为605 s,阻燃效果优异。对基础防火涂料样品和添加了纳米ATH的防火涂料样品进行理化性能测试和燃烧测试,综合分析测试结果,得到MZ=100 nm ATH在加量为9%以内的防火涂料性能较优,其中100-1和100-2阻燃效果最好,与基础涂料8#相比阻燃性能显著提升。从对防火涂料膨胀炭质层的SEM-EDX分析中可以得出,MZ=100 nm ATH的加量在3%左右时形成的膨胀炭质层是最理想的蜂窝状结构。通过红外分析得到20-2、50-5、100-1的膨胀炭质层内增加了1300-1cm~1450-1cm波段内出现的Si-O-Al强吸收不对称伸缩振动峰,且在1100-1cm~1200-1cm波段处20-2、50-5、100-1比8#出现更多的3-4PO吸收特征峰,这些都促进了膨胀炭质层的形成,说明纳米ATH对防火涂料的阻燃效果起到了促进作用。从对防火涂料的TGA-DSC分析得到,加入纳米ATH的防火涂料,无论是热解温度、热解时间还是残炭量均优于8#防火涂料,这些结论与锥形量热仪测得点燃时间结果相符。同时说明纳米ATH的加入提高了防火涂料的阻燃效果,且其脱水温度和吸热量与其粒径、含量、加热条件等有关。
[Abstract]:At present, combustible and flammable polymer materials are more and more widely used in all kinds of buildings, which lead to frequent and important fires. It is a widely used fire-proof protection method to apply fire-proof coatings to building substrates. In this paper, waterborne intumescent finishing fire resistant coatings were studied. Different particle size and amount of nano-aluminum hydroxide flame retardants were added to the basic coatings to study the influence of nano-sized ATH on the anti-fire coatings and the mechanism of flame retardancy. I mainly developed the: 1) to determine the basic formula components, The basic formula of anti-fire coating was optimized by orthogonal test design. Nano-ATHs with different particle sizes and different proportions were added to the anti-fire coatings, and some physicochemical properties and combustion properties of the samples were tested respectively. The results were analyzed by SEM and IR, and the pyrolysis process of fire resistant coatings was analyzed by thermogravimetry. The effect of nano ATH flame retardant on fire resistant coating and its flame retardant mechanism were analyzed. The conclusions are as follows: on the basis of determining the basic components in the formulation of fire resistant coatings, the emulsion and intumescent flame retardant system were optimized by using the orthogonal design method of Jianzhi49L3. In combination with the test results of ignition time, the best formulation of flame retardant coating was obtained. The flame retardant coating had excellent flame retardant effect under the condition of 302mkW of heat radiation intensity and 625 鈩，

本文编号：1775294