Thermal insulation and method of producing the same
a technology of thermal insulation and thermal insulation, which is applied in the field of thermal insulation, can solve the problems of reduced thermal insulation strength, increased environmental impact of use of binder, and increased time and energy required for removal of oil or the like, and achieves excellent thermal insulation performance and excellent strength
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example 1
Production of Thermal Insulation
There was produced a dry-pressed compact including anhydrous silica fine particles (hydrophilic fumed silica fine particles) having an average primary particle diameter of about 13 nm and having a thermal conductivity (25° C.) of 0.01 W / (m·K), and a heat-resistant glass fiber having an average fiber diameter of 10 μm and having an average fiber length of 3 mm.
That is, 100 parts by weight of a raw material for a thermal insulation including 90 mass % of silica fine particles and 10 mass % of a glass fiber and 0, 1, 3, 5, or 10 parts by weight of calcium hydroxide (Extra Pure Reagent, Wako Pure Chemical Industries, Ltd.) were fed into a mixing apparatus, and the mixture was subjected to dry mixing.
Then, the resultant dry-mixed powder was used to produce a dry-pressed compact having a plate shape of 100 mm×150 mm and 15 mm in thickness by dry-press forming. To be specific, a suitable amount of the dry-mixed powder was first filled in a forming mold havin...
example 2
Production of Thermal Insulation
There was produced a dry-pressed compact further including silicon carbide having an average particle diameter of 3 μm in addition to the silica fine particles and the glass fiber used in Example 1 described above.
That is, 100 parts by weight of a raw material for a thermal insulation including 75 mass % of silica fine particles, 5 mass % of a glass fiber, and 20 mass % of silicon carbide and 0, 3, 5, or 10 parts by weight of calcium hydroxide were fed into a mixing apparatus, and the mixture was subjected to dry mixing.
The resultant dry-mixed powder was used to produce a dry compact having a plate shape of 100 mm×150 mm and 15 mm in thickness by dry-press forming. In the dry-press forming, a pressing pressure was adjusted so as to provide the dry-pressed compact with a bulk density of 240, 260, 280 or 300 kg / m3.
Next, the dry-pressed compact including calcium hydroxide was kept for 8 hours in a thermo-hygrostat at a temperature of 80° C. and at a rela...
example 3
Production of Thermal Insulation
There was produced a dry-pressed compact including silica fine particles, a glass fiber, and silicon carbide in the same manner as that in Example 2 described above. That is, 100 parts by weight of a raw material for a thermal insulation including 75 mass of silica fine particles, 5 mass % of a glass fiber, and 20 mass % of silicon carbide and 0 or 3 parts by weight of calcium hydroxide were fed into a mixing apparatus, and the mixture was subjected to dry mixing.
The resultant dry-mixed powder was used to produce a dry-pressed compact having a plate shape of 100 mm×150 mm and 15 mm in thickness by dry-press forming. In the dry-press forming, a pressing pressure was adjusted so as to provide the dry-pressed compact with a bulk density of 240, 260, 280 or 300 kg / m3.
Next, the dry-pressed compact including calcium hydroxide was kept for 0 to 24 hours in a thermo-hygrostat at a temperature of 80° C. and at a relative humidity of 90%, to thereby carry out h...
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Abstract
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