Polycarbosilane/phenolic aldehyde double-system network structure aerogel as well as composite material and preparation method thereof

A technology of polycarbosilane and network structure, which is applied in the field of polycarbosilane/phenolic dual-system network structure airgel and its composite materials and preparation, can solve problems affecting high-temperature performance, delay decomposition and carbonization temperature, and increase Good mechanical properties and anti-scouring performance

Active Publication Date: 2021-12-28
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alumina component in the airgel will undergo phase transformation during high temperature use, which will affect its high temperature performance

Method used

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  • Polycarbosilane/phenolic aldehyde double-system network structure aerogel as well as composite material and preparation method thereof
  • Polycarbosilane/phenolic aldehyde double-system network structure aerogel as well as composite material and preparation method thereof
  • Polycarbosilane/phenolic aldehyde double-system network structure aerogel as well as composite material and preparation method thereof

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Experimental program
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preparation example Construction

[0029] As mentioned above, the present invention provides a kind of preparation method of polycarbosilane / phenolic double-system network structure airgel in the first aspect, it is characterized in that, described method comprises the following steps:

[0030] (1) Mix and stir the phenolic resin, the first organic solvent and an optional curing agent to obtain a phenolic resin solution S1;

[0031] (2) Mix and stir the polycarbosilane, the second organic solvent and the catalyst to obtain a polycarbosilane solution S2;

[0032] (3) Mix and stir the phenolic resin solution S1 and the polycarbosilane solution S2 to obtain the polycarbosilane / phenolic resin composite solution S3;

[0033] (4) Transfer the composite solution S3 to an airtight container, and a sol-gel reaction occurs under heating conditions to obtain a polycarbosilane / phenolic dual-system network structure wet gel;

[0034] (5) Drying the wet gel with polycarbosilane / phenolic dual-system network structure to obta...

Embodiment 1

[0068] After mixing 10g of Novolak type phenolic resin and 90g of cyclohexanone, add 0.5g of hexamethylenetetramine and mix to obtain S1; after mixing 10g of solid polycarbosilane and 90g of butyl ether, add 0.001g Mix and stir the platinum catalyst to obtain S2; mix and stir S1 and S2, transfer to a hydrothermal kettle, react at 150°C for 8h, take out the wet gel and let it dry at room temperature for 24h, and then transfer it to an oven at 70°C to dry for 12h to obtain See Table 1 for the density, linear shrinkage, residual weight (900°C), thermal conductivity (room temperature) and compressive strength of polycarbosilane / phenolic dual-system network structure airgel.

Embodiment 2

[0070] After mixing 15g of Resole type phenolic resin and 85g of ethyl acetate, S1 was obtained; after mixing 1.88g of polymethylsilane and 10.65g of tetrahydrofuran, adding 0.00094g of dicumyl peroxide and mixing to obtain S2 ;Mix and stir S1 and S2, transfer them to a hydrothermal kettle, react at 80°C for 10h, take out the wet gel and let it dry at room temperature for 30h, then transfer to a 55°C oven to dry for 18h to obtain a polycarbosilane / phenolic dual-system network Structural airgel, its density, linear shrinkage, residual weight (900°C), thermal conductivity (room temperature) and compressive strength are shown in Table 1.

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Abstract

The invention relates to polycarbosilane / phenolic aldehyde double-system network structure aerogel as well as a composite material and a preparation method thereof. The method comprises the steps of taking phenolic resin and polycarbosilane as reaction raw materials, dissolving, mixing, carrying out sol-gel reaction under a heating condition to obtain wet gel, and drying to obtain the polycarbosilane / phenolic aldehyde double-system network structure aerogel. The composite material can be compounded with a fiber product in situ according to needs to further improve the mechanical property of the composite material. The invention also relates to the phenolic aerogel prepared by the method or the composite material thereof. The phenolic aerogel or the composite material thereof has the characteristics of low density, good heat resistance, low heat conductivity coefficient, good mechanical property, low linear ablation rate, good anti-scouring performance and the like, can be used as a low-density thermal insulation material of a thermal protection system of an aerospace craft, and has important application value.

Description

technical field [0001] The invention relates to a polycarbosilane / phenolic dual-system network structure airgel and its composite material and preparation method, which are mainly used as low-density anti-heat insulation materials for the thermal protection system of aerospace vehicles. Background technique [0002] A space vehicle will generate severe aerodynamic heating during reentry / entry into the atmosphere, and the thermal protection system is an essential part to ensure the normal operation of the vehicle's internal equipment and electronic devices. Anti-heat / insulation material is a key component of the thermal protection system, and its effectiveness is related to the success or failure of flight and even the safety of life. [0003] The mesopore size (1 to 100nm) possessed by airgel can restrain the movement of gas molecules to a certain extent and reduce the heat transfer generated by the collision of gas molecules. Therefore, the macroscopic thermal conductivity ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L61/06C08L83/16C08K7/06C08K7/10
CPCC08J9/28C08J2361/06C08J2483/16C08J2383/16C08J2461/06C08K7/06C08K7/10
Inventor 贺丽娟刘韬王孟刘圆圆李文静张昊赵英民
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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