Vermiculite and nanometer silica composite nanometer multi-hole heat insulation plate and manufacturing method thereof
A nano-silica and nano-porous technology is applied in the field of thermal insulation materials, and can solve the problems of increasing material cost, high cost of nano-silica porous thermal insulation materials, and reducing high-temperature thermal conductivity of nano-silica porous thermal insulation materials. To achieve the effect of improving mechanical properties and improving high temperature thermal insulation performance
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specific Embodiment 1
[0022] The natural vermiculite raw ore of 0.3~2mm is heated and expanded in an extruder furnace at 500°C to form a loose bulk density of 190kg / m 3 expanded vermiculite. The expanded vermiculite after the expansion is 30% by weight, and the specific surface area is 200m 2 The nano-silica per gram is compounded by 70% by weight. The prepared raw materials were premixed in a nano-coating machine at a low speed of 300 rpm for 5 minutes, and then mixed at a high speed of 1400 rpm for 20 minutes to obtain a mixed raw material.
[0023] There are no expanded vermiculite particles in the mixed raw materials, and the expanded vermiculite has been peeled off into micro-nano vermiculite flakes less than 1 mm in size, forming a flaky powder. The mixed raw materials are pressed and molded under a pressure of 2.0 MPa in a molding device equipped with a negative pressure device to obtain the composite nanoporous insulation board of vermiculite and nano silicon dioxide of the present invent...
specific Embodiment 2
[0032] The natural vermiculite raw ore of 0.3~2mm is heated and puffed in an extruder furnace at 850°C to form a loose bulk density of 150kg / m 3 expanded vermiculite. The expanded vermiculite after the expansion is 50% by weight, and the specific surface area is 200m 2 The nano-silica per gram is compounded by 50% by weight. The prepared raw materials were premixed in a nano-coating machine at a low speed of 300 rpm for 5 minutes, and then mixed at a high speed of 1400 rpm for 20 minutes to obtain a mixed raw material.
[0033] There are no expanded vermiculite particles in the mixed raw materials, and the expanded vermiculite has been peeled off into micro-nano vermiculite flakes less than 1 mm in size, forming a flaky powder. The mixed raw materials are pressed and molded under a pressure of 2.0 MPa in a molding device equipped with a negative pressure device to obtain the composite nanoporous insulation board of vermiculite and nano silicon dioxide of the present inventio...
specific Embodiment 3
[0042] The 0.3-2mm natural vermiculite fragments are heated and puffed in the puffing furnace at 900°C to form a loose bulk density of 80kg / m 3 expanded vermiculite. The expanded vermiculite after the expansion is 60% by weight, and the specific surface area is 200m 2 The nano-silica per gram is compounded by 40% by weight. The prepared raw materials were premixed in a nano-coating machine at a low speed of 300 rpm for 5 minutes, and then mixed at a high speed of 1400 rpm for 20 minutes to obtain a mixed raw material.
[0043] There are no expanded vermiculite particles in the mixed raw materials, and the expanded vermiculite has been peeled off into micro-nano vermiculite flakes less than 1 mm in size, forming a flaky powder. The mixed raw materials are pressed and molded under a pressure of 2.0 MPa in a molding device equipped with a negative pressure device to obtain the composite nanoporous insulation board of vermiculite and nano silicon dioxide of the present invention...
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