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Nano silicon dioxide microporous heat insulator and preparation method thereof

A nano-silica and thermal insulator technology, applied in the field of inorganic non-metallic materials, can solve the problems of loss of bonding effect and structural integrity damage of thermal insulator products, and achieve the effects of good thermal insulation effect, light bulk density and low molding temperature.

Active Publication Date: 2011-06-22
SHANGHAI SHIPBUILDING TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at a service temperature greater than 500°C, the organic binder in the insulation will lose its bonding effect, and the structural integrity of the insulation product will be destroyed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] A method for preparing a nano-silica microporous heat insulator, characterized in that the preparation method includes the following steps:

[0032] Step 1, uniformly mix all powder materials according to the mass percentage of nano-silica 55-85%, opacifying agent 10-35%, reactive agent 2-12%, and inorganic fiber 3-10% by mass;

[0033] Step 2, the mixture obtained by step 1 is 180-220kg / m by volume 3 Weigh it and put it into the mold, and at the same time use a flat press to compress the mixture to the required thickness; the pressure range is 0.2-2.0MPa, and the specific implementation is to calculate the design thickness required for the molding of the insulator, and use a flat hydraulic press to compress the mixture to the required thickness. design thickness;

[0034] Step 3, keeping the pressure for 5-15 minutes, and then demoulding to form a green body;

[0035] Step 4. Put the green body pressed and formed in step 3 into an oven or a horse boiling furnace, rea...

Embodiment 1

[0038] The distribution ratio of each component of the heat insulator of the present invention is: (mass percentage):

[0039] 1. Nano silicon dioxide, its consumption is 60% of the overall component mass,

[0040] 2. The opacifying agent is silicon carbide, titanium dioxide mass ratio M 碳化硅 / M 二氧化钛 It is a 3:1 mixture, and its dosage is 25% of the mass of the whole component,

[0041] 3. The inorganic fiber is basalt fiber, and its consumption is 10% of the mass of the whole component,

[0042] 4. The reactive agent is sodium fluoride, aluminum dihydrogen phosphate mixed mass ratio M 氟化钠 / M 磷酸二氢铝 It is a 1:10 mixture, and its dosage is 5% of the mass of the whole component.

[0043] Preparation:

[0044] According to the various steps in the summary of the invention: mix and disperse the components of the above-mentioned embodiment 1; after the dispersion is uniform, weigh 106.8 g of the mixture obtained in the above steps and put it into a mold, and use a flat press, s...

Embodiment 2

[0047] The distribution ratio of each component of the heat insulator of the present invention is: (mass percentage):

[0048] 1. Nano silicon dioxide, its consumption is 85% of the mass of the whole component,

[0049] 2. The opacifying agent is silicon carbide, titanium dioxide mass ratio M碳化硅 / M 二氧化钛 It is a 2:1 mixture, and its dosage is 10% of the mass of the whole component,

[0050] 3. The inorganic fiber is aluminum silicate fiber, and its dosage is 3% of the mass of the whole component,

[0051] 4. The reactive agent is sodium fluoride, aluminum dihydrogen phosphate mixed mass ratio M 氟化钠 / M 磷酸二氢铝 It is a 1:2 mixture, and its dosage is 2% of the mass of the whole component.

[0052] Preparation:

[0053] According to the various steps in the summary of the invention: mix and disperse the components of the above-mentioned Example 2, and after the dispersion is uniform, weigh 91.6 g of the mixture obtained in the above-mentioned steps and put it into a mold, and pr...

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Abstract

The invention discloses a nano silicon dioxide microporous heat insulator, which is characterized by consisting of 55 to 85 percent of nano silicon dioxide, 10 to 35 percent of opaquer, 3 to 10 percent of inorganic fibers and 2 to 12 percent of reaction activator. In the invention, the nano silicon dioxide is used as a basic raw material, added with carborundum and titanium dioxide serving as an opaquer, reinforced by basalt fibers or aluminium silicate fibers and subjected to a chemical reaction at a low sintering temperature of 200 to 450 DEG C in the presence of the reaction activator consisting of activator sodium fluoride and aluminium dihydrogen phosphate, so that compounds such as fluosilicate and phosphosilicate are formed on the contact surfaces of the particles of the raw materials to connect the particles of the raw materials into a whole. When the technique disclosed by the invention is used for preparing the nano silicon dioxide microporous heat insulator, the process is simple and the manufacturing is convenient; and the prepared product has high heat insulating performance, and the coefficient of heat conductivity at the average temperature of 500 DEG C is less thanor equal to 0.038w / m.k.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metallic materials, and in particular relates to a nano-silica microporous heat insulator and a preparation method using a low sintering temperature. This heat insulator can be used in structural fire protection and heat insulation in high-demand occasions such as ships, ocean engineering, and aerospace. Background technique [0002] Nano-silica microporous insulator is a new type of material that has been paid attention to in research and application at home and abroad in recent years. Because the material has a low thermal conductivity under high temperature conditions, it has great application value in occasions with high heat insulation requirements. However, through a lot of work by researchers at home and abroad, although some achievements and progress have been made in the research of nanomaterials for thermal insulation, there are still some technical problems in the molding process...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B30/02
Inventor 石明伟张天财
Owner SHANGHAI SHIPBUILDING TECH RES INST
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