Silica aerogel-including blanket and method for preparing the same
The present disclosure provides a silica aerogel-including blanket including a substrate for a blanket; and a silica aerogel and an opacifying agent locating at least one of on a surface of and inside the substrate for a blanket, wherein the opacifying agent is a second particulate with inorganic particles of a first particulate being aggregated, and includes 1 to 5 of the inorganic particles per unit volume of 1 μm 3 , and a method for preparing the same. The silica aerogel-including blanket according to the present disclosure is capable of exhibiting flame retardancy as well as an excellent insulation property, particularly, an excellent insulation property at high temperatures, by including an opacifying agent having excellent dispersibility and high surface activity through chemical etching.
1. A silica aerogel-including blanket comprising:
a substrate for a blanket; and
a silica aerogel and an opacifying agent located at least at one of on a surface of the substrate for a blanket and inside the substrate for a blanket,
wherein the opacifying agent is prepared by dispersing inorganic particles into an aqueous basic solution and etching the particles,
wherein the opacifying agent is a second particulate having a structure formed by aggregation of inorganic particles of a first particulate, and includes 1 to 5 of the inorganic particles per unit volume of 1 μm 3 ,
wherein the opacifying agent has an average zeta-potential of −10 mV to −60 mV in water, and
wherein the second particulate has an average particle diameter of 300 nm to 600 nm and the first particulate has an average particle diameter of 100 nm to 300 nm.
2. The silica aerogel-including blanket of claim 1 , wherein the inorganic particle includes any one, or two or more of condensation reactive functional groups selected from the group consisting of hydroxyl groups, alkoxy groups, carboxyl groups and ester groups on a surface of the particle.
3. The silica aerogel-including blanket of claim 1 , wherein the inorganic particle has unevenness on a surface thereof.
4. The silica aerogel-including blanket of claim 1 , wherein the inorganic particle includes any one, or two or more selected from the group consisting of metal oxides, metal carbides, metal nitrides, metal hydroxides, metal salts, carbon-based materials, ceramic particles and mixtures thereof.
5. The silica aerogel-including blanket of claim 1 , wherein the inorganic particle includes any one titanium oxide selected from the group consisting of rutile-type TiO 2 and anatase-type TiO 2 .
6. The silica aerogel-including blanket of claim 1 , wherein the silica aerogel has a three-dimensional network structure with the first particles being bound.
7. The silica aerogel-including blanket of claim 1 , wherein the silica aerogel has a specific surface area of 700 m 2 /g or greater.
8. The silica aerogel-including blanket of claim 1 , wherein the silica aerogel is a hydrophobic silica aerogel having a carbon content of 8% by weight or greater with respect to a total weight of the silica aerogel.
9. The silica aerogel-including blanket of claim 1 , wherein the substrate for a blanket further includes a surface hydrophobization layer on at least one surface of the substrate.
10. The silica aerogel-including blanket of claim 1 , wherein the opacifying agent chemically binds to the silica aerogel to form an opacifying agent-silica aerogel complex.