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Al2O3 intercalated expanded vermiculite heat-insulating material and preparation method thereof

A technology of expanded vermiculite and thermal insulation materials, which is applied in the field of Al2O3 intercalated expanded vermiculite thermal insulation materials and its preparation, which can solve the problems of increased interlayer spacing, reduced compressive strength of thermal insulation materials, and low thermal conductivity. Achieve enhanced thermal insulation performance, increased compressive strength, and low thermal conductivity

Inactive Publication Date: 2013-02-13
WUHAN UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When used as the filling of expanded vermiculite in the manufacture of high-temperature heat insulation materials, although the thermal conductivity of its products is low, the strength is also low, and the application is greatly limited.
When high-strength cementing materials are used to bond expanded vermiculite into finished products, although it has greater strength than expanded vermiculite, it also reduces the thermal insulation effect of vermiculite
In addition, due to the large high temperature expansion rate of expanded vermiculite, the interlayer spacing increases, and the through-holes between the layers lead to a decrease in the compressive strength of the heat insulation material. The strength decreases with the decrease of the bulk density, and as the temperature increases High thermal conductivity increases rapidly, so it is difficult to increase the use temperature of thermal insulation materials, especially the thermal conductivity is still high or vermiculite products occupy a large volume, which limits the scope of application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] a kind of Al 2 o 3 Intercalated expanded vermiculite heat insulation material and its preparation method.

[0018] The first step is to mix expanded vermiculite: aluminum nitrate nonahydrate: ethanol according to the mass ratio of 1:1: (2~2.4), then dissolve aluminum nitrate nonahydrate in ethanol according to the mass ratio, and then add expanded vermiculite rock, stirred for 8-9.5 hours, and aged at room temperature for 1-2 hours to obtain the expanded vermiculite-aluminum gel compound;

[0019] The second step is to soak the expanded vermiculite aluminum gel compound in ethanol solution, soak it at 55~58℃ for 26~30h, then soak it at 68~71℃ for 50~54h, and then soak the expanded vermiculite aluminum The gel complex was taken out and dried at a constant temperature of 65~68°C for 72~78h to obtain Al 2 o 3 Intercalated expanded vermiculite;

[0020] The third step, with 40~55wt% Al 2 o 3 Intercalated expanded vermiculite and 45-60wt% forsterite are mixed as raw m...

Embodiment 2

[0023] a kind of Al 2 o 3 Intercalated expanded vermiculite heat insulation material and its preparation method.

[0024] The first step is to mix expanded vermiculite: aluminum nitrate nonahydrate: ethanol according to the mass ratio of 1:1: (2.4~3), then dissolve aluminum nitrate nonahydrate in ethanol according to the mass ratio, and then add expanded vermiculite, Stir for 9.5-11 hours, and age at room temperature for 1-2 hours to obtain the expanded vermiculite-aluminum gel compound;

[0025] The second step is to soak the expanded vermiculite aluminum gel compound in ethanol solution, soak for 22-26 h at 58-61°C, then soak for 46-50h at 70-73°C, and then soak the expanded vermiculite The aluminum gel composite was taken out and dried at a constant temperature of 68~70°C for 68~72h to obtain Al 2 o 3 Intercalated expanded vermiculite;

[0026] The third step, with 55~70wt% Al 2 o 3 Intercalated expanded vermiculite and 30-45wt% forsterite are mixed as raw materials,...

Embodiment 3

[0029] a kind of Al 2 o 3 Intercalated expanded vermiculite heat insulation material and its preparation method.

[0030] The first step is to mix expanded vermiculite: aluminum nitrate nonahydrate: ethanol according to the mass ratio of 1:1: (3~3.5), then dissolve aluminum nitrate nonahydrate in ethanol according to the mass ratio, and then add expanded vermiculite, Stir for 11~12h, and age at room temperature for 1~2h to obtain expanded vermiculite aluminum gel composite;

[0031] The second step is to soak the expanded vermiculite aluminum gel compound in ethanol solution, soak it at 61~65℃ for 18~22 hours, then soak it at 72~75℃ for 42~46 hours, and then soak the expanded vermiculite The aluminum gel composite was taken out and dried at a constant temperature of 70~75°C for 64~68h to obtain Al 2 o 3 Intercalated expanded vermiculite;

[0032] The third step, with 70~80wt% Al 2 o 3 Intercalated expanded vermiculite and 20-30wt% forsterite are mixed as raw materials, ...

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Abstract

The invention relates to an Al2O3 intercalated expanded vermiculite heat-insulating material and a preparation method thereof. According to the technical scheme, the preparation method comprises the following steps: 1) preparing materials on the basis of a mass ratio of expanded vermiculite to aluminum nitrate nonahydrate to ethanol being 1:1:(2-3.5), dissolving the aluminum nitrate nonahydrate into the ethanol according to the mass ratio, and then adding the expanded vermiculite, stirring for 8-12 hours, and ageing for 1-2 hours at room temperature, thereby obtaining an expanded vermiculite aluminum gel compound; 2) soaking the expanded vermiculite aluminum gel compound into the ethanol solution, soaking for 18-30 hours at 55-65 DEG C and then soaking for 42-54 hours at 68-75 DEG C, taking out and drying, thereby obtaining an Al2O3 intercalated expanded vermiculite; and 3) taking 40-80wt% of Al2O3 intercalated expanded vermiculite and 20-60wt% of forsterite as raw materials, mixing the raw materials, additionally adding an aluminum dihydrogen phosphate solution which accounts for 10-20wt% of the raw materials, stirring, pressing and forming, and drying, thereby obtaining the Al2O3 intercalated expanded vermiculite heat-insulating material. The Al2O3 intercalated expanded vermiculite heat-insulating material has the characteristics of lower coefficient of heat conductivity, higher strength and wider application scope.

Description

technical field [0001] The invention belongs to the technical field of thermal insulation materials, in particular to an Al 2 o 3 Intercalated expanded vermiculite heat insulation material and its preparation method. Background technique [0002] It is an effective way to save energy by researching and developing high-quality heat-insulating refractory materials and using them reasonably in industrial kilns. It can not only increase the life of the kiln, but also improve the quality of products, reduce heat loss, improve heat energy utilization efficiency and reduce energy waste, so as to achieve the purpose of saving energy and reducing product costs. Therefore, the demand for effective high-temperature insulation materials is becoming more and more urgent. [0003] Vermiculite is a dioctahedral or trioctahedral aluminosilicate mineral with a 2:1 structural unit layer and exchangeable cations and water molecules between the layers. The interlayer charge is between 0.6 an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B14/20
Inventor 顾华志王春风周飞吴斌高雄赵义黄奥
Owner WUHAN UNIV OF SCI & TECH
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