Preparation method of rigid structure reinforced phenolic aerogel heat shielding material
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A rigid structure, aerogel technology, applied in the field of composite materials, can solve the problems of low mechanical properties of phenolic aerogel, and achieve the effect of meeting design requirements, low operating site requirements, and strong dimensional stability
Active Publication Date: 2016-05-25
BEIJING SATELLITE MFG FACTORY
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Problems solved by technology
[0005] The technical problem solved by the present invention is: to overcome the shortcomings of phenolic airgel's own low mechanical properties, and provide a method for preparing a phenolic airgel heat shielding material that uses a rigid structure to improve the strength of the phenolic airgel material
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Embodiment 1
[0055] First, dissolve the phenolic solution in ethanol in a vacuum impregnation vessel to form a phenolic solution with a phenolic mass content of 20%, then press the three-dimensional needle-punched glass fiber mat into the phenolic solution, and the solution completely submerges the three-dimensional needle-punched glass fiber, and the vacuum After the impregnation sealing cover is fixed with the vacuum impregnation container, vacuum impregnation is carried out, the vacuum pressure is 10kPa, after 10 minutes of immersion, the vacuum impregnation sealing cover is opened, and then left to stand for 10 minutes.
[0056] Next, take the three-dimensional needle-punched glass fiber mat out of the solution, dry it in the air without solution flow out, put it in an oven to dry at 60°C for 2 hours, and then cure it at 175°C for 2 hours to form a rigid three-dimensional needle-punched glass fiber structure.
[0057] Then, resorcinol, furfural and sodium hydroxide were dissolved in eth...
Embodiment 2
[0061] First, dissolve the phenolic solution in isopropanol in a vacuum impregnation vessel to form a phenolic solution with a phenolic mass content of 30%, then press the three-dimensional needle-punched carbon fiber felt into the phenolic solution, and the solution completely submerges the three-dimensional needle-punched carbon fiber felt, and Vacuum impregnation is carried out after the vacuum impregnation sealing cover is fixed with the vacuum impregnation container, the vacuum pressure is 8kPa, the vacuum impregnation sealing cover is opened after immersion for 5 minutes, and then left to stand for 5 minutes.
[0062] Then, the three-dimensional needle-punched carbon fiber mat was taken out of the solution, dried in the air without solution outflow, put into an oven for 1 hour at 80°C, and then cured at 200°C for 2 hours to form a rigid three-dimensional needle-punched carbon fiber structure.
[0063] Then, resorcinol, furfural and sodium hydroxide were dissolved in ethan...
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Abstract
The invention relates to a preparation method of a rigid structure reinforced phenolic aerogel heat shielding material. The method includes: firstly dissolving phenolic resin in a solvent in a vacuum impregnation container to form a phenolic solution, then pressing a three-dimensional fiber structure into the phenolic resin solution, and conducting vacuum pumping on the vacuum impregnation container, after a period of time, opening a seal cover to maintain smooth air pressure with the outside and conducting standing for a period of time, then taking out the three-dimensional fiber structure and putting it into an oven to perform drying, and conducting high temperature curing to form a rigid three-dimensional fiber structure, then mixing resorcinol, furfural, ethanol and sodium hydroxide uniformly in proportion in the vacuum impregnation container to form a reactant solution, then pressing the rigid three-dimensional fiber structure into the solution, conducting vacuum pumping on the vacuum impregnation container again, maintaining the state for a period of time, then placing the vacuum impregnation container into the oven to carry out sol-gel process, and finally taking out the gel-containing three-dimensional fiber structure and performing drying, thus obtaining the rigid structure reinforced phenolic aerogel product.
Description
technical field [0001] The invention belongs to the field of composite materials, and relates to a preparation method of a high-temperature heat shielding material, which has good application value in high-temperature heat insulation of a rocket engine and ablation heat protection during the return process of a spaceship. Background technique [0002] Airgel is an ultra-low density, amorphous, nanoporous material with unique properties, its porosity reaches 80%-99.8%, the typical size of the pores is 1-100nm, and the minimum density can reach 3kg / m 3 . The nanoporous structure makes the material have extremely low thermal conductivity, the lowest can reach 0.013w / m.K, so it has a wide range of application prospects for heat insulation. [0003] Existing aerogels are mainly divided into organic aerogels and inorganic aerogels, in which the main component of inorganic aerogels is SiO 2 (Silicon dioxide), the temperature of this type of aerogel does not exceed 700°C. When the...
Claims
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