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Nanometer multiple-layer composite thermal insulation material and preparation method thereof

A thermal insulation material, nano-multi-layer technology, applied in heat exchange equipment, chemical instruments and methods, and pipeline protection through heat insulation, etc., can solve the difficulty of forming special-shaped products, and the difficulty of using and processing multi-layer reflective screen insulation materials and other issues to achieve the effects of ensuring stability, inhibiting high-temperature radiation heat transfer, and good performance

Active Publication Date: 2010-08-11
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the above-mentioned materials are all made of airgel particles, they must be covered and used as a whole, and it is difficult to process them. It is difficult to form special-shaped products, and the prepared multi-layer reflective screen insulation material is difficult to be used in occasions requiring complex shapes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The nano-multilayer composite thermal insulation material of this embodiment is composed of 20 layers of glass fiber cloth aluminized foil as an infrared reflective screen and 19 layers of high temperature resistant nanoporous aerogel thermal insulation composite material as spacers alternately laminated. The nanoporous aerogel thermal insulation composite material is composed of a 0.75mm thick single-layer flat-shaped high silica ceramic fiber felt and nanoporous silica aerogel; the high silica ceramic sewing thread is pierced and connected as a whole, and the stitch spacing is 10mm , The line spacing is 25mm.

[0041] Preparation: (1) Lay the high silica ceramic fiber mat into a single-layer flat fiber preform (20 layers) with a thickness of 0.75mm, and alternately layer them with glass fiber cloth aluminum foil (19 layers), and stitch with high silica ceramics. Thread piercing and sewing to make multi-layer ceramic fiber preforms; (2) Mix ethyl orthosilicate, methyltrim...

Embodiment 2

[0044] The difference between this embodiment and embodiment 1 is that when drying, the multi-layer ceramic fiber preform containing gel is placed in an oven, heated to 200°C at a rate of 2°C / min, kept for 30 hours, and cooled naturally. The same as in Example 1.

[0045] The nano-multilayer composite thermal insulation composite material prepared in this embodiment has a density of about 0.42g / cm 3 , The bending strength of the material is 2.3MPa, and the thermal conductivity of the material at 600℃ is 0.026W / m·K measured by the PBD-12-4Y flat thermal conductivity meter.

Embodiment 3

[0047] The difference between this embodiment and Example 1 is that the sol is alumina sol, and the ceramic fiber felt is mullite fiber felt; the preparation of alumina sol: aluminum isopropoxide, ethanol, deionized water and acetylacetone are in molar ratio Mix in a ratio of 1:20:6:0.4, heat the mixed solution to 75°C through a reflux device, stir at constant temperature for 60 minutes to form a sol, and then cool the sol to room temperature, add a mixture of methanol, deionized water and catalyst to obtain The molar ratio of alumina sol, methanol, deionized water, catalyst, and aluminum isopropoxide is 4:0.5:0.8:0.6; the rest is the same as in Example 1.

[0048] The nano-multilayer composite thermal insulation composite material of this embodiment has a density of about 0.35g / cm 3 The flexural strength of the material is 1.2MPa, and the thermal conductivity of the material at 1000°C is 0.055W / m·K measured by PBD-12-4Y flat thermal conductivity meter.

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Abstract

The invention discloses a nanometer multiple-layer composite thermal insulation material and a preparation method thereof. The nanometer multiple-layer thermal insulation composite material is formed by alternatively overlapping an infrared reflecting screen and a spacer; the ratio of total layer amounts n of the infrared reflecting screens and the spacers to the total thickness of the nanometer multiple-layer composite thermal insulation material is 0.5-4; the infrared reflecting screen is a metal foil or a metal plated foil; the spacer is a thermostability nanometer porous aerogel composite thermal insulation material; the infrared reflecting screen and the spacer are combined by being adhered with thermostability adhesives or in puncturing connection by thermostability sewing threads. The invention also comprises the preparation method of the nanometer multiple-layer composite thermal insulation material. The nanometer multiple-layer composite thermal insulation material of the invention has low density, favorable mechanical property and favorable high-temperature thermal insulation property, lowers requirements on the vacuum degree by a VIP plate when being used as vacuum thermal insulation plate core materials, does not need getter and can satisfy harsh high-efficiency thermal insulation using requirements on materials by aviation, aerospace and civil fields. The method of the invention can prepare thermal insulation material members with large size and complex shape.

Description

Technical field [0001] The invention relates to a multi-layer composite thermal insulation material and a preparation method thereof, in particular to a nano-multilayer composite thermal insulation material which can be used for thermal insulation under high temperature or low temperature environment and a preparation method thereof. Background technique [0002] In recent years, the global energy crisis has caused the society to put forward new urgent needs for thermal insulation materials. [0003] Vacuum insulation panel (VacuumInsulationPanel, VIP for short) is a new type of low temperature insulation material. VIP is mainly composed of three parts: core insulation material (Insulating material), gas adsorption material (Getter) and gas barrier film (Barrier). Because it effectively avoids air heat conduction, the thermal conductivity is greatly reduced to less than 0.004W / m·K, which is only 1 / 4 to 1 / 6 of the most commonly used insulation material—polyurethane rigid foam. It h...

Claims

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Application Information

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IPC IPC(8): F16L59/02F16L59/08B32B15/14
Inventor 张长瑞姜勇刚冯坚曹峰冯军宗胡海峰曹英斌
Owner NAT UNIV OF DEFENSE TECH
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