Nano heat insulation plate and preparation method thereof

[0049] In a preferred embodiment, the preparation method of the alumina comprises the following steps:

[0050] (1) melting aluminum ingot, then feeding chlorine to generate aluminum trichloride steam;

[0051] (2) mixing the preheated inert gas with aluminum trichloride steam to obtain raw material gas;

[0052] (3) The raw material gas is sprayed through the nozzle, contacted and reacted with the water vapor mixture, and then separated from the gas and solid to obtain it.

[0053] In a preferred embodiment, the chlorine gas is dry chlorine gas.

[0054] In a preferred embodiment, the temperature of the preheated inert gas is not lower than 600°C.

[0055] In a preferred embodiment, the speed at which the raw material gas is ejected through the nozzle is not lower than 100 m / s.

[0056] In a preferred embodiment, the preheating temperature of the nozzle is not lower than 600°C.

[0057] In a preferred embodiment, the aperture of the nozzle is not particularly limited, and

[0103] Example 1

[0104] Embodiment 1 provides a nano heat insulation board, and the preparation raw materials of the nano heat insulation board, in parts by weight, include the following components: 70 parts of silicon dioxide, 20 parts of alumina, 20 parts of silicon carbide, and 15 parts of fibers parts, 20 parts of silica fume, and 15 parts of silica sol.

[0105] The silica is fumed silica; the particle size of the fumed silica is 20±10nm, and the specific surface area is 200m 2 / g, purchased from Shandong Dongyue Chemical Co., Ltd.

[0106] The preparation method of the alumina comprises the following steps:

[0107] (1) aluminum ingot is melted, and then dry chlorine gas is introduced to generate aluminum trichloride steam;

[0108] (2) mixing the inert gas preheated to 800°C with aluminum trichloride vapor to obtain raw material gas;

[0109] (3) The raw material gas is sprayed at a speed of 200m / s through a nozzle, contacted and reacted with the water vapor mi

[0117] Example 2

[0118] Embodiment 2 provides a nano heat insulation board, and the preparation raw materials of the nano heat insulation board, in parts by weight, include the following components: 10 parts of silicon dioxide, 10 parts of silicon carbide, 5 parts of fibers, and 5 parts of silica fume parts, 5 parts of silica sol.

[0119] The silica is fumed silica; the particle size of the fumed silica is 1±10nm, and the specific surface area is 150m 2 / g, purchased from Shandong Dongyue Chemical Co., Ltd.

[0120] The preparation method of the alumina comprises the following steps:

[0121] (1) aluminum ingot is melted, and then dry chlorine gas is introduced to generate aluminum trichloride steam;

[0122] (2) mixing the inert gas preheated to 800°C with aluminum trichloride vapor to obtain raw material gas;

[0123] (3) The raw material gas is sprayed at a speed of 200m / s through a nozzle, contacted and reacted with the water vapor mixture, and then separated fro