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Moisture-proof treatment method and application of heat insulation material

A technology of thermal insulation material and moisture-proof treatment, applied in fiber processing, textiles and papermaking, etc., can solve the problems of inability to online hydrophobicity of thermal protection system, restricting use, etc., achieve stable and controllable weight gain, excellent moisture-proof performance, and reduce technology effect of difficulty

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, the current gas-phase hydrophobic methods often require vacuum conditions or high temperatures (>60°C), and will generate corrosive atmospheres (hydrochloric acid, etc.), so it is necessary to disassemble the heat-insulated structure and carry out separate moisture-proof treatment, instead of carrying out a separate moisture-proof treatment. The thermal protection system of precision equipment conducts overall online drainage, thus restricting the use of the above-mentioned high-performance thermal insulation materials in large-scale, highly integrated thermal protection systems (such as reusable aircraft, etc.)

Method used

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  • Moisture-proof treatment method and application of heat insulation material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The size is 500mm×500mm×30mm, the density is 0.25g / cm 3 A piece of commercially available quartz fiber reinforced silica airgel composite sheet without moisture-proof treatment with room temperature thermal conductivity of 0.02W / (m·K) is placed in a ziplock bag, and put into the bag with 20g water container, then seal the bag at room temperature and normal pressure for 4 to 8 hours. Take out the water container and replace it with 2g of ethanol ammonia solution with a mass fraction of 20%. After keeping it for 4 to 8 hours, take out the container and replace it with a container containing 20g of dimethylmethoxysilane, keep the system sealed for 12 After 2 hours, the composite material plate is taken out and placed in a naturally ventilated place until it reaches a constant weight for about 2 to 4 hours. The weight of the material increases by 2%, and the surface is in a superhydrophobic state. According to GB / T 12704 2009 test after random sampling, the moisture absorp...

Embodiment 2

[0065] The size is 500mm×500mm×30mm, the density is 0.2g / cm 3 , commercially available quartz fiber insulation tiles with room temperature thermal conductivity of 0.06W / (m K) are placed in a ziplock bag, and a container containing 10g of water is put into the bag, and the bag is sealed at room temperature and normal pressure to maintain 4 to 8 hours. Take out the water container and replace it with 2g of ethanol ammonia solution with a mass fraction of 20%, keep it for 4 to 8 hours, take out the container, spray 20g of dimethylmethoxysilane on the surface of the sample, and keep the system sealed for 8 hours , Take out the composite sheet and place it in a naturally ventilated place until it reaches a constant weight for about 2 to 4 hours, the weight of the material increases by 3%, and the surface is in a superhydrophobic state. After random sampling, according to GB / T 127042009, the moisture absorption rate is 0.7%, and the room temperature thermal conductivity of the mate...

Embodiment 3

[0067] The size is 500mm×500mm×30mm, the density is 0.1g / cm 3 A commercially available quartz fiber felt with a thermal conductivity of 0.03W / (m K) at room temperature is placed in a ziplock bag, a container containing 5g of water is put into the bag, and the bag is sealed at room temperature and normal pressure for 3 to 5 hours. Take out the water container and replace it with 1g of methanol ammonia solution with a mass fraction of 20%, keep it for 3 to 5 hours, take out the container, spray 10g of methylmethoxysilane on the surface of the sample, and keep the system sealed for 6 hours to After 8 hours, take out the composite sheet and place it in a naturally ventilated place until it reaches a constant weight in about 2 to 4 hours. The weight of the material increases by about 3%, and the surface is in a superhydrophobic state. After random sampling, according to GB / T 127042009, test the moisture absorption rate of 0.6%, and the room temperature thermal conductivity of the ...

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Abstract

The invention provides a moisture-proof treatment method for heat-insulating materials, comprising: introducing an activation reagent into the heat-insulating material at room temperature and normal pressure; introducing a catalyst into the heat-insulating material; Treatment of hot materials; ventilation of insulation materials with air flow under in-situ conditions. The invention also relates to the thermal insulation material produced by the method, the thermal protection component including thermal insulation treatment, the thermal protection system comprising the thermal protection component and the application of the thermal insulation material or the thermal protection component in building the thermal protection system. The method can be repeated in-situ on-line moisture-proof treatment at room temperature and normal pressure without corrosion, the overall weight gain and moisture absorption rate of the obtained material are low, and the change of basic thermal properties is small, which can realize rapid and multi-purpose heat insulation materials. The repeated hydrophobicity greatly prolongs and expands the service life and application scenarios of high-performance thermal insulation materials.

Description

technical field [0001] The invention relates to a moisture-proof treatment method for heat insulating materials, which belongs to the technical field of heat protection. Background technique [0002] Because the porous insulation materials represented by airgel, ceramic tiles, and fiber felts have many advantages such as high temperature resistance, light weight, excellent thermal insulation performance, and stable performance, they have been used in aviation, aerospace, deep space exploration, and It is widely used in the field of civil thermal insulation. However, the porosity of this kind of material is as high as 85%, the internal pore structure is rich, the specific surface area of ​​the material is large, and the surface hydroxyl group is rich, which makes this kind of material have strong hygroscopicity. Affected by moisture, fog or rain in the air during the process will cause a large amount of water to accumulate in the pore structure of the material, gradually agi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/60C04B41/80D06M13/513D06M15/643D06M11/05
CPCD06M13/513D06M15/643D06M11/05C04B41/009C04B41/60C04B41/80C04B30/02
Inventor 黄红岩张恩爽雷朝帅高宇智郭慧李文静杨洁颖裴雨辰赵英民张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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