基于镁铝水滑石原位合成制备阻燃纸

考察了利用纤维填充技术在纸浆纤维的细胞腔或细胞壁中原位合成镁铝水滑石制备阻燃纸的可行性及其工艺条件。其方法是向分散开的纤维中加入偏铝酸钠、氢氧化钠、碳酸钠并搅拌,最后加入氯化镁。研究了反应物浓度、反应温度、反应时间等对阻燃纸性能的影响。结果表明,利用纤维填充技术在纸浆纤维中原位合成镁铝水滑石制备阻燃纸是可行的。当镁铝水滑石的沉积率大于25%时,所制备的阻燃纸的氧指数在25%以上,已经达到难燃级。通过对加填后纤维的SEM观察,发现镁铝水滑石在纸浆纤维的表面、壁和腔中均有沉积。

Preparation of Flame Retardant Paper Based on In-Situ Synthesis of Mg-Al Hydrotalcites

The feasibility and technological conditions of the preparation of flame retardant paper based on fiber loading technology using in-situ synthesis of Mg-Al hydrotalcites in the lumen or cell wall of the pulp fibers were investigated.Sodium hydroxide solution,sodium carbonate solution and sodium meta-aluminate solution were added into the dispersed fibers,then magnesium chloride solution was added.The effects of reactant concentration,reaction temperature and reaction time on the various performances of flame retardant paper were systematically studied.The results indicated that preparing flame retardant paper based on fiber loading technology using in-situ synthesis of Mg-Al hydrotalcites in the pulp fibers is feasible.The oxygen index of the flame retardant paper produced is above 25% and reaches the grade which is difficult to burn when the deposition of Mg-Al hydrotalcites in the pulp fibers is higher than 25%.The deposition of Mg-Al hydrotalcites on the fiber surface,in the cell wall and lumen of the pulp fibers is found by SEM observation.