卡拉胶-纳米氢氧化铝协同阻燃天然橡胶

Synergistic effect of carrageenan and nano aluminum hydroxide on flame retardant of natural rubber

摘要:

将BaCl2分级的k型卡拉胶（KC）和纳米氢氧化铝〔Al（OH）3〕构成的协同阻燃体系添加到天然橡胶（NR）中制备KC-Al(OH)3/NR复合材料。通过TG、极限氧指数（LOI）、锥形量热（CCT）以及SEM考察了不同质量比的KC和Al（OH）3对复合材料力学性能和阻燃性能的影响。结果表明，当KC与Al(OH)3以1:1的质量比加入到NR时，KC-Al（OH）3/NR复合材料的热稳定性、阻燃性能最优，复合材料的LOI达到25%，与纯天然橡胶相比，复合材料总热释放量（THR）、热释放速率峰值（pHRR）、总烟释放量（TSP）和平均质量损失率（AMLR）分别降低了65%、12%、23%和62%。相比于单独添加氢氧化铝体系，复合材料拉伸强度和断裂伸长率分别上升了10%和19%

Abstract:

KC-Al(OH)3/NR composites were prepared by adding a synergistic flame retardant system consisting of carrageenan (KC) precipitated by BaCl2 and nano-aluminium hydroxide (Al(OH) 3) to natural rubber (NR). The flame retardant was added into natural rubber (NR), and the flame retardancy and mechanical prop-erties of NR composites were tested by limited oxygen index (LOI), vertical burning test (UL-94), thermal gravimetric analysis (TG), cone calorimetry test (CCT). The NR containing 15 wt% KC and 15 wt% Al(OH) 3 displayed LOI value of 25% and UL-94 V-0 rating. CCT showed that the total heat release (THR), peak heat release rate (pHRR), peak smoke release rate (pSPR) and Average mass loss rate (AMLR) of NR de-creased by 65%, 12%, 23% and 62% when 15 wt% KC and 15 wt% Al(OH) 3 were added to pure NR.