植物纤维细胞腔原位沉淀无机阻燃剂制备阻燃纸的研究

Preparation of Flame Retardant Paper by in-Situ Precipitation of Inorganic Flame Retardant in Plant Fiber

用氯化镁和氨水在植物纤维细胞腔内原位沉淀对纤维进行阻燃改性,使形成的氢氧化镁粒子沉积在细胞腔内起到阻燃的作用,制备的纸张的极限氧指数(Limiting Oxygen Index,简称LOI)达到阻燃要求的同时减少直接加填法填料对纸张强度的影响。本试验采用正交试验的方法探究植物纤维原位沉淀改性工艺对纸张阻燃性的影响,实验结果表明,最佳纤维改性工艺条件为:氯化镁溶液浓度1.0 mol·L^(-1),反应温度30℃,预浸时间30 min,反应时间10 min。在该最佳工艺条件下,纸张LOI值可达27.0%,抗张指数为8.04 N·m·g^(-1)。

Magnesium chloride and ammonia were used to modify plant fiber by in situ precipitation, the magnesium hydroxide particles generated deposited in fiber cell and play the role of flame retardant, and the limiting oxygen index （LOI） of the paper made from the modified plant fiber meet the requirements of fire resistance, and reduce the influence of flame-retardant fillers on the strength of paper. In this paper, the effect of plant fiber in situ precipitation modification on the flame resistance of paper was studied by orthogonal test. The results indicate that the optimum conditions of fiber modification are： concentration of magnesium chloride solution is 1.0 mol·L^-1, preqeaching time is 30 rains, reaction temperature is 30%1, and reaction time is 10 mins. Under this condition, the limiting oxygen index and tensile index of the paper are 27.0% and 8.04 N·m·g^-1 respectively, can meet the requirements of multiple use.