次微米級氫氧化鋁粉末之製備及其 熱性質分析之研究

Investigation of Sub-micron Al(OH)3 Powder and its Thermal properties analysis

廖原章(Yung-Chang Liao)

指導教授 ： 吳吉輝

中原大學/理學院/化學研究所/碩士(2005年)

https://doi.org/10.6840/cycu200500064

摘要

鋁可形成類型相當廣泛的氧化物及氫氧化物，從耐燃材料中的火焰阻緩劑、觸媒載體、疫苗輔助劑、陶瓷之原料等皆為其可應用的範圍。本研究以貝民公司市售供應之氫氧化鋁粉末為基礎原料，經BET、SEM、雷射粒徑測試儀測量得其平均粒徑約為2.22μm，且表面積僅有0.900~1.32m2g-1，作為民生用途上潛力較低，而經TGA及DSC的熱分析，知其熱分解為兩階段式，並在第一階段有一強吸熱峰其吸熱值為2.32kJg-1，作為火焰阻燃劑應有其市場，但在其他用途上仍待開發。本研究以鹼液消化法、鋁粉合成法、球磨法嘗試製得次微米級氫氧化鋁，以鹼液消化法獲得平均粒徑約為447nm的粉末，已較貝民公司產品的平均粒徑減少約5倍，同時亦以熱分析方法比較其與微米級氫氧化鋁之熱性質的差異。而由硫酸鋁與碳酸氫鈉水溶液合成所得之奈米級AlOOH，經1200℃高溫鍛燒4小時後，可獲得平均粒徑為725nm之次微米級氧化鋁，是為產製次微米級氧化鋁之簡便方法。

關鍵字

氫氧化鋁 ； 氧化鋁 ； 次微米

並列摘要

The major application of aluminum hydroxide are in paper glazes, paint additives, ceramic catalyst carrier, pharmaceuticals, toothpaste, and as a fire retardant. Aluminum hydroxide operates in the two stages combustion process of polymeric material, that is heating and decomposition. On heating, when the temperature above 200℃, the water vapor was released from aluminum hydroxide, and this reaction is strongly endothermic absorbing 2.32kJg-1, this is why aluminum hydroxide can be as a fire retardant. In this study, aluminum hydroxide were conducted to thermal analysis, such as DSC and TG, the physical properties and thermal decomposition mechanism were also examined by thermal analysis techniques, X-ray ,Layser Diameter Analyser,and SEM. The preparation methods of sub-micron aluminum hydroxide was synthesised by putting aluminium powder in sodium hydroxide solution, digestion in different concentration of sodium hydroxide solution at 40-70℃, and desizing by miller.Products of sub-micron aluminum hydroxide powder was conducted to TGA and DSC, and the thermal properties can be obtained, and these thermal properties was compared including the micron one. Nanoparticle of AlOOH was synthesized from Al2(SO4)3 and NaHCO3 solution,it will become to sub-micro alumina oxide by heating in an oven at 1200℃ for 4 hours. It is a convenient road to obtain the sub-micro alumina oxide powder.

並列關鍵字

Sub-micron ； Aluminum trihydroxide ； Alumina oxide

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