Thermal insulation material and method for producing thermal insulation material
A thermal insulation material contains: a dehydration condensation reaction product of sodium silicate; alumina cement; and smoked charcoal. The thermal insulation material preferably further contains one or more selected from the group consisting of a silica-based hollow balloon, a silicate mineral, and diatomaceous earth. The thermal insulation material has, for example, a board-shaped form. In a method for producing a thermal insulation material, a raw material containing sodium silicate, alumina cement, and smoked charcoal is heated to cause a dehydration condensation reaction of the sodium silicate to occur.
1 . A thermal insulation material comprising:
a dehydration condensation reaction product of sodium silicate as a component (a);
40 parts by mass or more and 100 parts by mass or less of alumina cement with respect to 100 parts by mass of the component (a);
30 parts by mass or more and 80 parts by mass or less of smoked charcoal with respect to 100 parts by mass of the component (a); and
one or more selected from the group consisting of:
3 parts by mass or more and 15 parts by mass or less of a silica-based hollow balloon with respect to 100 parts by mass of the component (a);
1 part by mass or more and 10 parts by mass or less of a silicate mineral with respect to 100 parts by mass of the component (a); and
3 parts by mass or more and 20 parts by mass or less of a diatomaceous earth with respect to 100 parts by mass of the component (a).
2 . The thermal insulation material according to claim 1 , having a board-shaped form.
3 . A method for producing a thermal insulation material, the method comprising:
heating a raw material comprising sodium silicate, alumina cement, and smoked charcoal to cause a dehydration condensation reaction of the sodium silicate to occur;
the raw material containing:
sodium silicate as a component (a);
40 parts by mass or more and 60 parts by mass or less of alumina cement with respect to 100 parts by mass of the component (a);
20 parts by mass or more and 50 parts by mass or less of smoked charcoal with respect to 100 parts by mass of the component (a); and
one or more selected from the group consisting of:
1 part by mass or more and 10 parts by mass or less of a silica-based hollow balloon with respect to 100 parts by mass of the component (a);
1 part by mass or more and 10 parts by mass or less of a silicate mineral with respect to 100 parts by mass of the component (a); and
3 parts by mass or more and 20 parts by mass or less of a diatomaceous earth with respect to 100 parts by as of the component (a).
4 . The method for producing a thermal insulation material according to claim 3 , further comprising the step of pouring the raw material into a mold to produce the thermal insulation material having a board-shaped form.