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A kind of heat insulation material containing anti-radiation agent with gradient distribution and its preparation method and application

A technology of anti-radiation agent and thermal insulation material, which is applied in textiles, papermaking, fiber processing, etc., can solve the problems of restricting high-temperature thermal insulation efficiency, uneven distribution of anti-radiation agent, and reducing the anti-radiation efficiency of anti-radiation structure. , to achieve the effect of improving high temperature insulation efficiency, excellent integrity, and reducing dosage

Active Publication Date: 2022-01-28
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the anti-radiation scheme of the reinforcement fiber, since the anti-radiation agent is only concentrated on the surface of the fiber, there is a problem of uneven distribution of the anti-radiation agent.
In short, all will reduce the heat radiation resistance efficiency of the heat radiation resistance structure, so it restricts the further improvement of the high temperature heat insulation efficiency of the above high-performance heat insulation materials in the application process of large-scale and integrated heat protection systems

Method used

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  • A kind of heat insulation material containing anti-radiation agent with gradient distribution and its preparation method and application
  • A kind of heat insulation material containing anti-radiation agent with gradient distribution and its preparation method and application

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preparation example Construction

[0019] In a first aspect, the present invention provides a method for preparing a heat insulating material containing a gradient distribution anti-radiation agent, the method comprising the following steps:

[0020] (1) Surface treatment: use a composite sol containing silica and alumina to adjust the reactivity of the surface groups of the fiber reinforcement, and then use a silane coupling agent to adjust the fiber surface polarity of the fiber reinforcement;

[0021] (2) Precursor dispersion preparation: disperse antiradiation agent in silica sol precursor, obtain the first dispersion liquid (ie low antiradiation agent content dispersion liquid) with the first antiradiation agent concentration and have the second antiradiation agent Concentration of the second dispersion liquid (i.e. high anti-radiation agent content dispersion liquid), the concentration of the first anti-radiation agent is lower than the concentration of the second anti-radiation agent; then to the first di...

Embodiment 1

[0067] The size is 500mm×500mm×25mm, the density is 0.1g / cm 3 A piece of commercially available quartz fiber felt with room temperature thermal conductivity of 0.03W / (m K) is placed in a container, and a mass fraction of 10 % silica / alumina sol solution, and immerse the fiber mat, keep it for 5 to 10 minutes, take out the fiber mat and dry it, after heat treatment at 100°C-1h / 200°C-1h / 300°C-1h figure 1 In the mold in, the mold size is 550mm×550mm×30mm.

[0068] Add rutile titanium dioxide with a particle size of 4 μm to the commercially available silica hydrosol with a solid content of 20%, and the dosages are 5% and 50% of the mass of the sol, respectively, to form A liquid and B liquid correspondingly. Add polyethylene glycol with a molecular weight of 1000 to liquid A and liquid B respectively, in an amount of 0.1% by mass of rutile titanium dioxide. The pH of the system was controlled at about 6 by adding concentrated hydrochloric acid dropwise, and the two systems were ...

Embodiment 2

[0071] The size is 500mm×500mm×25mm, the density is 0.1g / cm 3 , a piece of commercially available quartz fiber felt with room temperature thermal conductivity of 0.03W / (m K) is placed in a container, and a mass fraction of 10 % silica / alumina sol solution, and immerse the fiber mat, keep it for 5 to 10 minutes, take out the fiber mat and dry it, after heat treatment at 100°C-1h / 200°C-1h / 300°C-1h figure 1 In the mold in, the mold size is 550mm×550mm×30mm.

[0072] Add silicon carbide with a particle size of 4 μm to the commercially available silica hydrosol with a solid content of 20%, and the dosages are 5% and 40% of the mass of the sol, respectively, to form A liquid and B liquid correspondingly. Add polyethylene glycol with a molecular weight of 1000 to liquid A and liquid B respectively, in an amount of 0.1% by mass of rutile titanium dioxide. The pH of the system was controlled at about 6 by adding concentrated hydrochloric acid dropwise, and the two systems were stirre...

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Abstract

The invention relates to a heat insulation material containing a gradient distribution anti-radiation agent and its preparation method and application, including: using a silicon-aluminum composite sol and a silane coupling agent to adjust the surface group reactivity and surface polarity of the fiber reinforcement respectively ; Preparation of dispersions containing silica sol precursors, surfactants, catalysts and different concentrations of anti-radiation agents; while adding dispersions with high concentrations of anti-radiation agents to dispersions with low concentrations to form mixed dispersions, perform glue injection , then gelled, aged, and dried. The invention also relates to the heat insulating material prepared by the method and its application. The heat insulation material has a structure of uniform and discrete distribution of anti-radiation particles in the plane and a discrete distribution of normal gradients, which maximizes the anti-radiation efficiency brought by the same mass anti-radiation agent while ensuring excellent integrity, eliminating The adsorption and filtration of anti-radiation agent particles by fibers realizes the arbitrary matching of reinforcement fibers and anti-radiation agents and solves the problem of agglomeration.

Description

technical field [0001] The invention relates to a heat-insulating material containing a gradient-distributed anti-radiation agent, a preparation method and application thereof, and belongs to the technical field of heat protection. Background technique [0002] Nano heat insulation materials represented by oxide airgel materials such as silica and alumina have many advantages such as high temperature resistance, light weight, excellent heat insulation performance, and stable performance. It is widely used in the field of detection and civil heat insulation. The nano-skeleton and nano-pore structure possessed by this type of material can greatly inhibit solid-phase heat conduction and convective heat conduction, so it has excellent heat insulation effect. However, this type of material has good permeability to infrared radiation in the high temperature area, and as the temperature rises, the proportion of radiation heat transfer will increase rapidly and gradually become the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/24C04B41/64D06M11/79D06M11/45
CPCC04B28/24C04B41/64C04B41/4922D06M11/79D06M11/45C04B2201/20C04B2201/32C04B2111/00379C04B14/4625C04B14/305C04B24/32C04B22/122C04B22/126C04B14/324C04B14/4656C04B41/4515
Inventor 黄红岩张恩爽雷朝帅苏力军贺丽娟李文静杨洁颖张昊赵英民裴雨辰
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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