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Nano-pore super heat-insulating material and preparation method thereof

A thermal insulation material and nanoporous technology, which is applied in ceramic products, other household appliances, household appliances, etc., can solve the problems of increased thermal conductivity, no improvement in mechanical properties of materials, reduced thermal insulation effect of materials, etc., and achieves low bulk density. , the effect of good mechanical properties and low thermal conductivity

Inactive Publication Date: 2012-07-25
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The introduction of opacifying agents into some airgel materials reduces the thermal conductivity of the airgel materials, but the mechanical properties of the materials are not improved; some airgel materials improve the mechanical properties of the materials by adding reinforcements, but due to the high fiber The thermal conductivity of the material increases the solid-phase heat transfer of the material, resulting in a decrease in the thermal insulation effect of the material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A nanoporous super thermal insulation material and a preparation method thereof. First, 55~60wt% silica fume, 20~30wt% infrared shielding agent, 10~20wt% glass fiber and 5~10wt% dextrin are mixed at room temperature for 4~6h, and then pressed into molding, then 1 The temperature rise rate of ~3℃ / min is increased to 200~300℃, and the temperature is kept for 2~4 hours to obtain the nanoporous super insulation material.

[0019] The bulk density of the nanoporous super insulation material prepared in Example 1 is 0.4~0.55g / cm 3 , 0.035~0.05W / m·K at 300℃; thermal conductivity of 0.050~0.070W / m·K at 500℃; thermal conductivity of 0.07~0.08W / m·K at 900℃; flexural strength of 1.70~ 1.85MPa; compressive strength is 1.75~1.95MPa.

Embodiment 2

[0021] A nanoporous super thermal insulation material and a preparation method thereof. First, 60~65wt% silica fume, 15~25wt% infrared shielding agent, 10~20wt% glass fiber and 5~10wt% lignin are mixed at room temperature for 2~3h, and then pressed into shape, then 2 The temperature rise rate of ~4℃ / min is increased to 400~500℃, and the temperature is kept for 2~4 hours to obtain the nanoporous super insulation material.

[0022] The volume density of the nanoporous super thermal insulation material prepared in Example 2 is 0.45~0.65g / cm 3 , 0.04~0.05W / m·K at 300℃; thermal conductivity of 0.055~0.07W / m·K at 500℃; thermal conductivity of 0.075~0.085W / m·K at 900℃; flexural strength of 1.63~ 1.75MPa; compressive strength is 1.67~1.80MPa.

Embodiment 3

[0024] A nanoporous super thermal insulation material and a preparation method thereof. First, 65~70wt% silica fume, 15~20wt% infrared shielding agent, 10~15wt% glass fiber and 5~10wt% cellulose are mixed at room temperature for 2~3h, and then pressed into shape, then 3 The temperature rise rate of ~5℃ / min is raised to 300~400℃, and the temperature is kept for 2~4 hours to obtain the nanoporous super insulation material.

[0025] The volume density of the nanoporous super thermal insulation material prepared in Example 3 is 0.5~0.65g / cm 3 , 0.045~0.055W / m·K at 300℃; thermal conductivity of 0.05~0.07W / m·K at 500℃; thermal conductivity of 0.075~0.09W / m·K at 900℃; flexural strength of 1.25~ 1.52MPa; compressive strength is 1.44~1.56MPa.

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Abstract

The invention relates to a nano-pore super heat-insulating material and a preparation method of the nano-pore super heat-insulating material. A technical scheme of the preparation method is as follows: mixing 55-75wt% of silica fume, 10-30wt% of an infrared screening agent, 10-25wt% of glass fiber and 5-10wt% of a bonding agent for 2-6 hours in a room temperature condition; carrying out compression moulding; heating to 200-600 DEG C in a heating rate of 1-5 DEG C per minute; and holding the temperature for 2-4 hours, so as to obtain the nano-pore super heat-insulating material. The volume density of the nano-pore super heat-insulating material prepared by the invention is 0.4-0.7g / cm<3>; the average pore size is 50-70nm; the coefficient of heat conductivity is 0.035-0.06W / m.K at a temperature of 300 DEG C, is 0.05-0.08W / m.K at a temperature of 500 DEG C, and is 0.07-0.09W / m.K at a temperature of 900 DEG C; the breaking strength is 1.20-1.85MPa; and the compression strength is 1.25-1.95MPa. The nano-pore super heat-insulating material provided by the invention has the characteristics of low volume density, uniform pore distribution, good mechanical property and low coefficient of heat conductivity.

Description

technical field [0001] The invention belongs to the technical field of porous thermal insulation materials, and in particular relates to a nanoporous super thermal insulation material and a preparation method thereof. technical background [0002] There are three main application areas of thermal insulation materials: thermal insulation of traditional industrial low-temperature thermal equipment, vehicles, household appliances and other facilities; thermal insulation of building envelope structures; thermal insulation of industrial high-temperature kiln furnaces. Thermal insulation materials with excellent performance and good thermal insulation technology can often achieve twice the result with half the effort in industrial thermal insulation. [0003] Traditional thermal insulation materials are mainly based on increasing gas phase porosity and reducing thermal conductivity and conductivity, among which artificial mineral wool, glass fiber, refractory ceramic fiber, calciu...

Claims

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Application Information

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IPC IPC(8): C04B38/00
Inventor 赵雷王俊杰李淑静李远兵雷中兴
Owner WUHAN UNIV OF SCI & TECH
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