种分分解法制备EVA阻燃剂用亚微米氢氧化铝

Preparation of sub-micron aluminum hydroxide used in EVA retardant by precipitation

摘要:

以硝酸铝和铝酸钠溶液为主要原料，加入适量添加剂，采用中和法制备氢氧化铝晶种，并将该晶种加入铝酸钠溶液中进行种分分解,制备出亚微米氢氧化铝粉体。在添加剂为乙酸，中和反应温度为60℃，搅拌速度为400r/min，种分分解过程分解首温为60℃，分解末温为55℃，分解时间48小时，晶种添加量为2-3%的条件下，制备出了粒度D50在1.80μm左右，D90＜3.5μm，比表面积＜5.0m2/g的亚微米氢氧化铝粉体，该粉体结晶完整，形貌为块状。该氢氧化铝粉体和目前EVA阻燃剂所用国外氢氧化铝产品相比，在粒度分布、比表面积、吸油率和形貌成型度等方面都差异不大，可以替代国外同类产品。

Abstract:

Abstract:The aluminum nitrate and sodium aluminate solution were used as mainly raw materials, after adding some additive, aluminum hydroxide seed crystal was prepared in the method of neutralization. The sub-micron aluminum hydroxide was prepared by precipitation after the seed crystal was added to sodium aluminate solution. When the additive was acetic acid, the neutralization temperature was 60℃, the stir-ring speed was 400r/min, and the beginning temperature of precipitation was 60℃, the final temperature was 55℃, the total precipitation time were 48 hours, the dosage of seed crystal were 2-3%, the sub-micron aluminum hydroxide with narrow particle size distribution(D50 is about 1.8μm, D90＜3.5μm) , suitable BET(BET＜5.0m2/g) and completely morphology was prepared. Compared with the EVA retardant alu-minum hydroxide from foreign country, the particle size distribution, BET, oil absorption and morphology of both products were similar. So the aluminum hydroxide prepared in test had a chance to replace the for-eign products.