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Aerogel gradient thermal insulation material containing endothermic opacifying agent

A technology of thermal insulation material and sunscreen agent, applied in the direction of layered products, etc., can solve the problems of reduced thermal insulation performance, small thermal inertia, insufficient, etc., to achieve the effect of improving strength and solving low strength

Active Publication Date: 2018-02-16
XI AN JIAOTONG UNIV
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Problems solved by technology

However, from the perspective of the basic principle of heat transfer, it has two obvious defects: 1) it has light transmission in the range of 3-8 μm, which greatly reduces its heat insulation performance when used in a high-temperature environment; 2) It has very small density and specific heat, resulting in small thermal inertia, fast temperature response under unsteady conditions, and insufficient short-term heat insulation capacity
However, in order to meet the thermal insulation requirements of short-term high temperature (such as the order of thousands of seconds), it is difficult to significantly improve the high-temperature short-term thermal insulation performance of the material itself simply from the type, particle size and content of the opacifying agent.
[0004] In order to solve the problem of small thermal inertia of airgel, airgel phase change composite materials are usually prepared by infiltration method. The phase change composite materials produced by this method generally have the characteristics of easy leakage after melting of phase change materials, high thermal conductivity and infrared transparency. light and other shortcomings

Method used

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[0031] Material application conditions: the high temperature end is 1200°C, the initial temperature of the material is 25°C, the cold end is insulated, and the thickness of the heat insulation material is 5cm. Airgel material is SiO 2 Airgel, pure SiO 2 The airgel material has a density of 110kg / m 3 .

[0032] In this embodiment, the doping of 4 layers of heat-absorbing sunscreens is taken as an example for illustration. In this embodiment, the shell of the heat-absorbing sunscreen agent only uses SiC single material with high temperature resistance and good light-shielding effect. 3.75μm, 4μm, the inner and outer diameter ratio is 0.8; the core material of the endothermic sunscreen is Al-25wt% Si, KNO 3 , erythritol, stearic acid; the volume content of heat-absorbing sunscreens is 8%, 6%, 5% and 4%; the volume content of fiber is 1%. After working for 30 minutes, the back temperature of the airgel gradient thermal insulation material containing heat-absorbing opacifying ...

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Abstract

The invention provides an aerogel gradient thermal insulation material containing an endothermic opacifying agent. The aerogel gradient thermal insulation material comprises 3-5 layers of thermal insulation layers, wherein each layer is composed of a SiO2 aerogel, reinforcing fiber doped therein and a core-shell structure opacifying agent. Specifically, the opacifying agent shell is an opacifyingmaterial, and the core is a phase-change material. The aerogel matrix has low thermal conductivity and can suppress heat conduction. The opacifying shell can inhibit radiative heat transfer. The phase-change material absorbs heat in the melting process and improves the thermal inertia of the material. Therefore, the material has the characteristics of low thermal conductivity, low radiation heat transfer capacity, large apparent specific heat and the like, greatly improves the high-temperature and short-acting heat insulation performance of SiO2 aerogel, can meet the high-temperature and short-acting heat insulation requirements of aerospace, military use and the like, and also meets the long-acting heat insulation requirements of industrial high temperature thermal protection and the like. By adding the fiber and endothermic opacifying agent, the aerogel gradient thermal insulation material provided by the invention solves the low strength, phase-change material leakage after melting,high thermal conductivity, infrared light transmission and the like in existing latent heat type thermal insulation materials, and has strong practicability.

Description

technical field [0001] The invention relates to the field of high-temperature heat insulation, and relates to an airgel gradient heat insulation material containing a heat-absorbing sunscreen agent. Background technique [0002] SiO 2 Airgel is a typical nanoporous material, which is composed of a three-dimensional nano-solid framework and gas filled in nano-scale pores, and has a low density (~0.003g / cm 3 ), low thermal conductivity (under normal temperature and pressure can be as low as (~0.013W / (m K)) and good thermal stability (~1200℃), it is a super thermal insulation material with great application prospects in energy saving , new energy technology, aerospace and other fields have broad application prospects. But from the perspective of the basic principle of heat transfer, it has two obvious defects: 1) it has light transmission in the range of 3-8 μm, which makes it in the The heat insulation performance is greatly reduced when used in a high temperature environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B9/00B32B9/04B32B3/26B32B1/00
CPCB32B1/00B32B3/26B32B5/18B32B5/32B32B9/00B32B9/04B32B2266/126B32B2307/304B32B2307/71
Inventor 李增耀朱传勇
Owner XI AN JIAOTONG UNIV
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