MANUFACTURING METHOD OF METAL OXIDE DISPERSION

To provide a dispersion for forming a film high in infrared ray shielding performance and transparency.SOLUTION: After obtaining a plurality of kinds of aliphatic acid metal salts by mixing aliphatic acid of CHO(n=5 to 14), and a plurality of kinds of metal sources selected from a group consisting of Zn, In, Sn, Sb and Al by a direct method or a double decomposition method, a mixture of the aliphatic acid metal salt is heated at 130°C to 250°C and cooled, and a metal soap, which is a precursor of a metal oxide primary particle, is obtained. The precursor is heated at 200°C to 350°C and the metal oxide primary particle is dispersed in a precursor melting liquid. A solvent for cleaning having a δP value which is 5 to 12 higher than δP value of a dielectric polarization term of Hansen solubility parameter of a solvent for final dispersion is added to the dispersion, the metal oxide primary particle is washed and aggregated at same time to obtain a metal oxide secondary particle, and washing is repeated. A dispersion of the metal oxide secondary particle with average particle diameter of 50 nm to 150 nm is obtained by adding the solvent for final dispersion.SELECTED DRAWING: Figure 1 【課題】赤外線遮蔽性能と透明性の高い膜を形成するための分散液を提供する。【解決手段】直接法又は複分解法により、ＣnＨ2nＯ2の脂肪酸（ｎ＝５〜１４）と、Ｚｎ、Ｉｎ、Ｓｎ、Ｓｂ及びＡｌからなる群より選ばれた複数種類の金属源とをそれぞれ混合して複数種類の脂肪酸金属塩を得た後、脂肪酸金属塩の混合物を１３０℃〜２５０℃で加熱し冷却して金属酸化物一次粒子の前駆体である金属石鹸を得る。この前駆体を２００℃〜３５０℃で加熱して前駆体融液中に金属酸化物一次粒子を分散させる。この分散液に、最終分散用溶媒のハンセンの溶解度パラメータの分極項のδＰ値より５〜１２高いδＰ値を有する洗浄用溶媒を加えて金属酸化物一次粒子を洗浄させ同時に凝集させて金属酸化物二次粒子を得た後、洗浄を繰り返す。最終分散用溶媒を添加して平均粒径が５０ｎｍ〜１５０ｎｍの金属酸化物二次粒子の分散液を得る。【選択図】図１