原位沉淀法制备氢氧化镁阻燃棉织物及其性能

Preparation and Properties of Magnesium Hydroxide Flame Retardant Cotton Fabrics by In-situ Precipitation Method

以氯化镁为前驱体,棉织物为基体,采用原位沉淀法制备出氢氧化镁阻燃棉织物。研究制备过程中氯化镁浓度、反应时间、反应温度、浸渍时间等参数对原位沉淀处理后棉织物阻燃性能的影响。结果发现影响棉织物阻燃效果的主要因素为氯化镁浓度以及浸渍时间;通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)对阻燃棉织物的结构形貌进行表征,结果表明合成的氢氧化镁颗粒为六边形晶体结构并且均匀附着在棉织物表面;利用热重分析仪(TG)以及微型锥形量热仪(MCC)等对其热稳定性和阻燃性能进行分析,结果表明氢氧化镁主要在凝聚相起阻燃效果,600℃时残渣量比原棉高出30%;热释放速率峰值比纯棉织物下降了55.3%,总热释放减少了21.6%,阻燃效果良好。

Magnesium hydroxide flame retardant cotton fabrics were prepared by in-situ precipitation method using sodium hydroxide as precursor and cotton fabrics as substrate.Effects of magnesium chloride concentration,immersion time,reaction temperature and reaction time on the properties of flame retardant cotton fabric were studied by vertical flame retardant tester.Results show that the magnesium chloride concentration and immersion time are the main elements influencing the flame retardant properties.Structure and morphology of the fabrics were characterized experimentally,the results indicate the successful synthesis of the hexagonal structure of magnesium hydroxide particles and the uniform magnesium hydroxide coating on fabrics surface.Thermal stability and flame retardant property were also investigated using methods including Micro Combustion Calorimeter(MCC).The results show that magnesium hydroxide mainly retard flame in the condensed phase,the residual carbon at 600℃is 30%higher than that in pure cotton fabrics;the peak of the heat release rate decreased by 55.3%and total heat release rate decreased by 21.6%compared to pure fabrics,indicating a good flame retardant effect.