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Repair coating for aerogel surface defects as well as preparation method and application of repair coating

An airgel and coating technology, applied in the direction of coating, etc., can solve problems such as easy pits and cracks, affect product service life, and reduce material mechanical properties, so as to reduce scrap rate, improve service life, and excellent matching Effect

Active Publication Date: 2022-05-13
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]However, after the phenolic airgel is bumped during use and processing, the surface of the material is prone to pits, cracks and other defects, and these defects will even seriously reduce the The mechanical properties of materials lead to a sharp increase in the scrap rate of such materials, which not only causes waste of material resources, but also affects the service life of related products

Method used

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  • Repair coating for aerogel surface defects as well as preparation method and application of repair coating
  • Repair coating for aerogel surface defects as well as preparation method and application of repair coating

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preparation example Construction

[0049] According to some preferred embodiments, preferably, the preparation method of the phenolic resin solution includes: adding the phenolic resin into a solvent, stirring and dissolving, and then adding a curing agent, stirring and mixing to obtain the phenolic resin solution.

[0050] It should be noted that the selected phenolic resin of the present invention includes but not limited to commonly used phenolic resin, modified phenolic resin (boron phenolic, barium phenolic), molecular weight includes but not limited to 800~1500 (for example, can be 800,900 , 1000, 1100, 1200, 1300, 1400, 1500, etc.).

[0051] According to some preferred embodiments, the stirring speed is 50-1000rpm (for example, it can be 50rpm, 100rpm, 200rpm, 500rpm, 600rpm, 800rpm or 1000rpm), and the stirring time is 2-10h (for example, it can be 2h, 3h , 5h, 6h, 8h or 10h).

[0052] According to some preferred embodiments, the solvent is at least one selected from methanol, ethanol, isopropanol, ace...

Embodiment 1

[0066] The mass fraction of each component in the repair paint is: 35% of phenolic resin solution, 15% of airgel, 20% of nanometer inorganic oxide and 30% of inorganic fiber;

[0067] Preparation:

[0068] (1) Add the phenolic resin to the solvent (acetone) and stir to dissolve, stir at a rotating speed of 250r / min for 3h to dissolve and disperse, then add a curing agent (aniline) to it, continue to stir at a rotating speed of 250r / min for 3h and mix evenly to obtain a phenolic resin solution;

[0069] The consumption of acetone accounts for 30% of the consumption of phenolic resin, and the consumption of aniline accounts for 0.8% of the consumption of phenolic resin;

[0070] (2) Airgel (phenolic airgel powder, particle size is 50nm), nano-inorganic oxide (SiO with a particle size of 30nm) according to the above proportioning ratio 2 powder) into the phenolic resin solution obtained in step (1), stirred and mixed at 350r / min for 0.5h, dispersed evenly, and then added inorga...

Embodiment 2

[0074] The mass fraction of each component in the repair coating is: 40% of phenolic resin solution, 10% of airgel, 20% of nanometer inorganic oxide and 30% of inorganic fiber;

[0075] Preparation:

[0076] (1) Add the phenolic resin to the solvent (isopropanol) and stir to dissolve, stir at a speed of 300r / min for 3h to dissolve and disperse, then add a curing agent (hexamethylenetetramine) to it, and continue to stir at a speed of 300r / min Mix evenly for 4.5 hours to obtain a phenolic resin solution;

[0077] The consumption of Virahol accounts for 40% of the consumption of phenolic resin, and the consumption of hexamethylenetetramine accounts for 1% of the consumption of phenolic resin;

[0078] (2) Airgel (phenolic airgel powder, particle diameter is 80nm), nano inorganic oxide (particle diameter is the Al of 30nm) according to the above proportioning ratio earlier 2 o 3 powder) into the phenolic resin solution obtained in step (1), stirred and mixed at 350r / min for 0....

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Abstract

The invention provides an aerogel surface defect repairing coating as well as a preparation method and application thereof, the repairing coating is applied to a to-be-repaired surface of a phenolic aerogel material, and the repairing coating comprises the following components in percentage by mass: 10-70% of a phenolic resin solution, 10-30% of aerogel, 10-30% of nano inorganic oxide and 10-30% of inorganic fiber. The repair coating provided by the invention can be used for repairing defects of phenolic aerogel materials, is simple to operate, has excellent matching property with the phenolic aerogel materials, and has excellent maintainability and ablation resistance.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a repairing coating for airgel surface defects, a preparation method and application thereof. Background technique [0002] Airgel is a porous three-dimensional network structure constructed by the interconnection of gel particles. Due to its low density, high porosity, large specific surface area and low thermal conductivity, it is widely used in adsorption, separation, catalysis, energy conversion and storage and other fields. Phenolic airgel is a porous, organic material composed of phenolic polymer molecular chains to form a gel network. Phenolic resin has the characteristics of heat resistance, high carbon residue, and flame retardancy. Phenolic airgel is injected into the boundary layer during the ablation process to produce thermal blocking effect, and the pyrolytic carbon layer dissipates heat through the reverse radiation effect; The thermal conductivity of the gel an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D161/06C09D7/61C09D7/65
CPCC09D161/06C09D7/61C09D7/70C09D7/65C08K2201/011C08K2003/2227C08K2003/2244C08K2003/2296C08K2201/005C08L61/06C08K7/26C08K7/10C08K3/22C08K7/08C08K7/06
Inventor 黄秀波张杨刘圆圆李文静孙同臣
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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