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A kind of manufacturing method of nanometer microporous thermal insulation material

A technology for thermal insulation materials and manufacturing methods, which is applied in the field of manufacturing nano-microporous thermal insulation materials, and can solve problems such as damaging the high-temperature performance of thermal insulation materials

Active Publication Date: 2016-02-10
上海柯瑞冶金炉料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to control this phenomenon, inorganic binders such as water glass or hard calcium silicate are introduced into the composition, but these compositions will damage the high temperature performance of the insulation material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The design specifications of the nano-microporous insulation material products are 300mm (length) × 300mm (width) × 30mm (height). It is composed of nano-silica, infrared shading agent, refractory and ceramic fiber. Accurately weigh the above raw materials, first disperse the ceramic fibers with a high-speed mixer, then add other raw materials and the dispersed ceramic fibers in turn into the mixer, and continue stirring until the mixture is uniform. Composition bulk density 40kg / m 3 , The average particle size of the powder is 30-50 nanometers, the diameter of the ceramic fiber is 6 microns, and the length is 5mm.

[0027] The cavity size is 309mm (length) × 309mm (width) × 186mm (height). The diameter of the small holes through the die bottom plate and the punch plate is 1mm, and they are distributed equidistantly in a 10mm square. Lay a 320-mesh screen on the bottom of the mold, load the material, and then cover the surface of the powder with a 320-mesh screen. S...

Embodiment 2

[0030] The design specifications of the nano-microporous insulation material products are 300mm (length) × 300mm (width) × 20mm (height). Its composition and raw material processing method are with embodiment 1.

[0031] The cavity size is 309mm (length) × 309mm (width) × 124mm (height). The diameter of the small holes through the die bottom plate and the punch plate is 1mm, and they are distributed equidistantly in a 12mm square. Lay a mesh of less than 320 mesh on the bottom of the mold, load the material, and then cover the surface of the powder with a mesh of 320 mesh. Start the press, the pressure is 2MPa. When it is compressed to a cavity height of 24mm, stop the punch from descending, keep the pressure for 1 minute, and then unload. Stay for a while, waiting for the green body to rebound. Then press again to a cavity height of 20mm (overpressure 3%), hold the pressure for 1 minute again, demould, the green body rebounds to a height of 20.6mm, that is, the size of th...

Embodiment 3

[0034] Figure 1 is a schematic diagram of the distribution of vent holes on the bottom plate of the mold and the upper punch panel. The vent holes have a diameter of 0.5-1mm and are distributed equidistantly in a square of 8-12mm. The hole size and hole spacing can be adjusted according to the vent requirements. For ceramic materials with a compression ratio of 500-800%, the vent holes described above are suitable.

[0035] Figure 2 is a schematic diagram of double-sided press molding, in the figure 1. mold wall, 2. composition powder, 3. sand screen, 4. lower vent hole, 5. upper vent hole, 6. movable mold bottom plate, 7 . Punch, 8. Punch panel, 9. Punch vent.

[0036] It is appropriate to use double-sided pressure and open through holes on the bottom plate of the mold and the upper punch panel (as shown in Figure 1).

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Abstract

The invention discloses a preparation method of a nanometer microporous thermal insulation material. A component of the nanometer microporous thermal insulation material comprises nano silica, an infrared opacifying agent, a refractory body, and ceramic fiber; average particle size of the component ranges from 15 to 50nm; and bulk density ranges from 40 to 60kg / m<3>. According to the preparation method, the raw materials above are mixed uniformly, and are subjected to dry-pressing moulding; in moulding processes, through small holes arranged on the bottom of a die and the plane of a puncher pin are used for air exhaust, and a screen mesh is used for covering the through small holes so as to avoid escaping of nano powder; the puncher pin and the bottom plate of the die are moved downward and upward respectively at a same speed so as to avoid density nonuniformity caused by frictional force when powder compression ratio is too high; double-surface pressing and moderate overpressure are adopted so as to avoid bounce error and control product thickness; and sheet material obtained via dry-pressing is subjected to sintering at a temperature of 800 DEG C, and furnace cooling.

Description

technical field [0001] The invention discloses a method for manufacturing a nano-microporous thermal insulation material. Background technique [0002] High-performance thermal insulation materials are of great significance for energy saving and consumption reduction. Due to its unique microstructure, nano-microporous thermal insulation materials have excellent thermal insulation properties, and their thermal conductivity can even be lower than that of vacuum. The iron and steel industry is a high-energy-consuming industry. If high-performance thermal insulation materials are used for the lining of the blast furnace, the energy utilization rate will be effectively improved. However, in addition to the ultra-low thermal conductivity, the thermal insulation material for the lining of the blast furnace should also have certain mechanical strength and long-term stability under high temperature (800-1000°C). USP6,936,326 thermal insulation material composition includes fine met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/02
Inventor 胡一晨吴朝齐蓝振华赵玲娣柯美亚祝惟人
Owner 上海柯瑞冶金炉料有限公司
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