Infrared shielding nanoparticle, its manufacturing method, infrared shielding nanoparticle dispersion using the same, and infrared shielding base material
AssigneeSumitomo Metal Mining Co., Ltd.
InventorAtsushi Tofuku
Life of this patent
Estimating the term…
Abstract
There is provided infrared shielding nanoparticles having excellent water-resistant property and excellent infrared shielding property, which is the infrared shielding nanoparticles of composite tungsten oxide expressed by a general formula WyOz and/or a general formula MxWyOz, with an average primary particle size of the nanoparticle being 1 nm or more and 800 nm or less, and a surface of the nanoparticle being coated with tetrafunctional silane compound or its hydrolysis product and/or an organic metal compound.
Claims22
Infrared shielding nanoparticles, which are nanoparticles of tungsten oxide expressed by a general formula WyOz (wherein W is tungsten, O is oxygen, satisfying 2.2≦z/y≦2.999) and/or composite tungsten oxide expressed by a general formula MxWyOz (wherein M is H, He, alkali metal, alkali earth metal, rare earth elements, one kind or two kinds or more of elements selected from a group consisting of Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, I, W is tungsten, O is oxygen, satisfying 0.001≦x/y≦1, 2.2≦z/y≦3), wherein an average primary particle size of the individual nanoparticle is lawn or more and 800 nm or less, and the surface of the nanoparticle is coated with a tetrafunctional silane compound expressed by a general formula Si(OR)4 (wherein R is identical or different kind of 1-6C univalent hydrocarbon group) or its partial hydrolysis product, and/or an organic metal compound.
A manufacturing method of infrared shielding nanoparticles, comprising the steps of
- obtaining a dispersion liquid by dispersing in an organic solvent, tungsten oxide nanoparticles expressed by a general formula WyOz (wherein W is tungsten, O is oxygen, satisfying 2.2≦z/y≦2.999), and/or composite tungsten oxide nanoparticles expressed by a general formula MxWyOz (wherein M is H, He, alkali metal, alkali earth metal, rare earth elements, one kind or more elements selected from a group consisting of Mg, Zr, Cr, Mn, Fe, Ru, Co, Rh, Ir, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga, In, Tl, Si, Ge, Sn, Pb, Sb, B, F, P, S, Se, Br, Te, Ti, Nb, V, Mo, Ta, Re, Be, Hf, Os, Bi, and I, W is tungsten, O is oxygen, (0.001≦x/y≦1, 2.2≦z/y≦3);
- adding and mixing into the dispersion liquid, a tetrafunctional silane compound expressed by a general formula Si(OR)4 (wherein R is identical or different kind of 1-6C univalent hydrocarbon group) or its partial hydrolysis product, and/or adding and mixing an organic metal compound, to thereby coat a surface of the individual tungsten oxide nanoparticle and/or composite tungsten oxide nanoparticle with the tetrafunctional silane compound or its partial hydrolysis product, and/or the organic metal compound;
- evaporating and removing the organic solvent and further applying heat treatment thereto, to thereby obtain a powder body of the tungsten oxide nanoparticles and/or the composite tungsten oxide nanoparticles coated with the tetrafunctional silane compound or its partial hydrolysis product and/or the organic metal compound;
- and
- pulverizing the powder body to thereby obtain the tungsten oxide nanoparticles and/or the composite tungsten oxide nanoparticles coated with the mono-dispersed tetrafunctional silane compound or its partial hydrolysis product and/or the organic metal compound.
Dependencies are inferred from the claim text.