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Method for densifying surface of aerogel thermal insulation material

A heat insulation material and aerogel technology, applied in applications, household appliances, ceramic products, etc., can solve the problems of impregnation, surface densification of composite materials, and inability to form panel layers, etc., to achieve the effect of expanding the scope of application

Active Publication Date: 2022-03-29
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]Usually, the surface densification of airgel composite materials is done by impregnating a certain depth of inorganic sol on the surface of the composite material for densification. Storage, commonly used sols include inorganic water-based silica sol, inorganic water-based aluminum sol, etc. However, due to the intrinsic hydrophobicity of quartz fiber-reinforced silicone airgel composites, after the composite material is dried, it is difficult for the water-based silica sol to adhere to the surface of the composite material. Effective impregnation is formed, and a certain depth and density of the panel layer cannot be formed, making it difficult to achieve surface densification of composite materials

Method used

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  • Method for densifying surface of aerogel thermal insulation material
  • Method for densifying surface of aerogel thermal insulation material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) The mass ratio of the precursor methyltrimethoxysilane, solvent water, surfactant cetyltrimethylammonium bromide, and catalyst ammonia water is 15:20:0.1:0.3, and the organic Silica sol.

[0027] 2) Composite the organic silica sol and the quartz fiber prefabricated body according to the mass ratio of 4:1 through the RTM process. The RTM process is as follows: the quartz fiber prefabricated body is clamped in the mold, vacuumed to below 0.01MPa, and vacuum impregnated The organosilicon sol is sucked into the mold and fully impregnated with the quartz fiber preform, and compounded after the organosilicon sol gels.

[0028] 3) Put the mold after the RTM glue injection process into an oven for gelation and aging treatment, the aging treatment temperature is 80°C, and the aging time is 96h.

[0029] 4) Take the aged composite material out of the mold and dry it under normal pressure. The drying process is 10°C / 180h and 100°C / 24h to obtain the quartz fiber reinforced sil...

Embodiment 2

[0032] 1) The mass ratio of the precursor methyltrimethoxysilane, solvent water, surfactant cetyltrimethylammonium bromide, and catalyst ammonia water is 20:30:0.2:0.5, and the organic Silica sol.

[0033] 2) Composite the organic silica sol and the quartz fiber preform by RTM process at a mass ratio of 5:1. The RTM process is: clamp the quartz fiber preform in the mold, vacuumize to below 0.01MPa, and vacuum impregnate the The organosilicon sol is sucked into the mold and fully impregnated with the quartz fiber preform, and compounded after the organosilicon sol gels.

[0034] 3) Put the mold after the RTM glue injection process into an oven for gelation and aging treatment. The aging treatment temperature is 100° C. and the aging time is 48 hours.

[0035] 4) The aged composite material was taken out of the mold and dried under normal pressure. The drying process was 20°C / 100h and 110°C / 18h to obtain the quartz fiber reinforced silicone airgel composite material.

[0036] ...

Embodiment 3

[0038] 1) The mass ratio of precursor dimethyldimethoxysilane, solvent water, surfactant cetyltrimethylammonium chloride, and catalyst ammonium fluoride is 25:40:0.3:0.7, through sol-gel Colloidal technology to prepare organosilica sol;

[0039] 2) Composite the organic silica sol and the quartz fiber prefabricated body according to the mass ratio of 6:1 through the RTM process. The RTM process is as follows: the quartz fiber prefabricated body is clamped in the mold, vacuumed to below 0.01MPa, and vacuum impregnated The organosilicon sol is sucked into the mold and fully impregnated with the quartz fiber preform, and compounded after the organosilicon sol gels.

[0040] 3) Put the mold after the RTM glue injection process into an oven for gelation and aging treatment. The aging treatment temperature is 120° C. and the aging time is 24 hours.

[0041] 4) Take the aged composite material out of the mold and dry it under normal pressure. The drying process is 40°C / 60h and 120°C...

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Abstract

The invention discloses a method for densifying the surface of an aerogel heat prevention and insulation material, and belongs to the technical field of nano heat prevention and insulation materials. After an aerogel composite material with a nano-pore structure is formed in situ, the surface of the heat insulation material is densified by repeatedly dipping and brushing sol with a certain thickness; wherein the density of a finally brushed panel can be higher through the water-based silica sol and the ethanol, and a thermal protection material with an anti-scouring surface can be prepared by controlling the brushing times and dosage and controlling the depth and density of a surface compact layer, so that the surface of the aerogel thermal protection material has anti-scouring performance, and the application range of the aerogel thermal protection material is expanded.

Description

technical field [0001] The invention relates to a method for densifying the surface of an airgel anti-heat insulation material, and belongs to the technical field of nanometer anti-heat insulation materials. Background technique [0002] As a typical nanoporous material, airgel has important application prospects in the field of aerospace thermal protection due to its unique properties such as high specific surface area and low thermal conductivity. However, due to the nanoporous structure of airgel, when its composite material is used as an anti-insulation material for aircraft external thermal protection materials, it needs to undergo surface densification to withstand the erosion of gas without denudation. Therefore, surface densification is important Airgel composites are the key to avoiding failure as external thermal protection materials for aircraft. [0003] Usually, the surface densification method of airgel composite materials is to impregnate a certain depth of i...

Claims

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Application Information

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IPC IPC(8): C04B28/24C04B41/68C04B38/00C04B111/40
CPCC04B28/24C04B41/009C04B41/5089C04B41/68C04B38/0054C04B38/0045C04B2111/40C04B14/4631
Inventor 雷朝帅宋寒李文静张恩爽刘圆圆张昊赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH