SCALY BOEHMITE AGGREGATE AND MANUFACTURING METHOD THEREOF

To provide a scaly boehmite aggregate of a microsize having a bulky card house structure in which highly crystalline scaly boehmite crystals are aggregated and a manufacturing method thereof.SOLUTION: A scaly boehmite aggregate of the present invention is a scaly boehmite aggregate having a bulky card house structure in which crystals of scaly boehmite aggregate with each other, wherein the oil absorption amount of refined linseed oil measured according to pure linseed oil method of JIS K5101-13-1 (2004) is 190 g/100 g or more, and the cumulative pore volume at a pore diameter of 0.05 to 2.00 μm is 0.40 mL/g or more, as measured by a mercury porosimeter. In the method for manufacturing scaly boehmite aggregates of the present invention, hydrothermal treatment is applied while stirring a water suspension containing any one additive of aluminum hydroxide having an average particle size (based on volume) of 4 to 20 μm measured by laser diffraction/scattering method, sodium carbonate or sodium aluminate.SELECTED DRAWING: Figure 1 【課題】結晶性の高い鱗片状ベーマイトの結晶同士が凝集した嵩高いカードハウス構造を有するマイクロサイズの鱗片状ベーマイト凝集体及びその製造方法を提供すること。【解決手段】本発明の鱗片状ベーマイト凝集体は、鱗片状ベーマイトの結晶同士が凝集した嵩高いカードハウス構造を有する鱗片状ベーマイト凝集体であって、ＪＩＳ Ｋ５１０１－１３－１（２００４）の精製あまに油法に準じて測定した、精製あまに油の吸油量が１９０ｇ／１００ｇ以上であり、かつ水銀ポロシメータによって測定した、細孔直径０．０５～２．００μｍにおける積算細孔容積が０．４０ｍＬ／ｇ以上である。本発明の鱗片状ベーマイト凝集体の製造方法は、レーザー回折・散乱法で測定した平均粒径（体積基準）が４～２０μｍの水酸化アルミニウムと、炭酸ナトリウム又はアルミン酸ナトリウムのいずれか１種の添加剤と、を含む水懸濁液を撹拌しながら水熱処理する。【選択図】図１