Moisture-proof modified phenolic heat insulating material and preparation method thereof

A thermal insulation material and phenolic technology, which is applied in the field of moisture-proof modified phenolic thermal insulation materials and its preparation, can solve problems affecting the use and storage life, and achieve stable and controllable weight gain, wide and cheap raw material sources, and good compatibility. Effect

Active Publication Date: 2022-07-22
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the known reports related to the waterproof modification of phenolic materials, the hydrophobic treatment of the material is mainly achieved by compounding a hydrophobic coating on the outer surface of the material. This treatment can prevent liquid water from interacting with the The contact of phenolic insulation materials prevents the material from absorbing liquid water, but it cannot fundamentally solve the problem that the residual phenolic hydroxyl groups on the surface of the internal pores of the material absorb and enrich gaseous water, so it affects the above-mentioned high-performance insulation materials in large and highly integrated The use and storage life of the thermal protection system

Method used

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  • Moisture-proof modified phenolic heat insulating material and preparation method thereof
  • Moisture-proof modified phenolic heat insulating material and preparation method thereof
  • Moisture-proof modified phenolic heat insulating material and preparation method thereof

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preparation example Construction

[0029] A preparation method of a moisture-proof modified phenolic heat insulating material, the method comprises the following steps:

[0030] (1) Preparation of hydrophobic agent: the hydrophobic modifier is mixed with a solvent to obtain a hydrophobic agent with hydrophobic modification function;

[0031] (2) hydrophobization reaction: adding the hydrophobic agent to the phenolic heat insulating material for heat preservation to carry out the hydrophobization reaction;

[0032] (3) Drying: after the hydrophobization reaction is completed, under in-situ conditions, the excess hydrophobization reagent is removed by heating to obtain a moisture-proof modified phenolic heat insulating material.

[0033] Further, in step (1), the hydrophobic modifier is selected from a reagent having a molecular structure represented by formula (1) or formula (2):

[0034]

[0035]

[0036] where R 1 Choose from -H, -CN, -NO 2 , -SO 2 R7, -SO 2 N R 7 R 8 , -COR 7 , -COOR 7 , -CONR ...

Embodiment 1

[0060] Take the size as 500mm×500mm×30mm, density 0.5g / cm 3 , a piece of commercially available phenolic aerogel composite material without moisture-proof treatment with a room temperature thermal conductivity of 0.06W / (m·K), placed in a tank with a height of 800mm and a Φ800mm, and kept the atmosphere connected at 60 ℃. 4h. Under the condition of maintaining the same temperature, the tank was evacuated to a vacuum, and then 187.5g of methyl acrylate was inhaled, and then the tank was closed and kept at 60 °C for 12 hours. The surface of the material is in a hydrophobic state, the weight gain of the material is 2%, the moisture absorption rate is 0.8%, and the change of thermal conductivity at room temperature is less than 1%.

Embodiment 2

[0062] Take the size as 500mm×500mm×30mm, density 0.5g / cm 3 , a piece of commercially available phenolic aerogel composite material without moisture-proof treatment with a room temperature thermal conductivity of 0.06W / (m·K), placed in a tank with a height of 800mm and a Φ800mm, and kept the atmosphere connected at 60 ℃. 4h. Under the condition of maintaining the temperature unchanged, the tank was evacuated to a vacuum, and then a mixture of 187.5g methyl acrylate and 187.5g acetone was inhaled, and the tank was closed and kept at 60 °C for 12 hours. The surface of the material is in a hydrophobic state, the weight gain of the material is 2.5%, the moisture absorption rate is 0.6%, and the thermal conductivity at room temperature does not change <1%.

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Abstract

The invention belongs to the technical field of thermal protection, and discloses a moisture-proof modified phenolic heat insulating material and a preparation method. The method includes the following steps: (1) preparing a hydrophobic agent: mixing the hydrophobic modifier with a solvent to prepare a hydrophobicizing agent with a hydrophobic modification function; (2) hydrophobizing reaction: adding the hydrophobic agent to the phenolic (3) Drying: after the hydrophobization reaction is completed, under in-situ conditions, the excess hydrophobization reagent is removed by heating to obtain a moisture-proof modified phenolic insulation material. hot material. The heat insulating material of the present invention is excellent in moisture resistance.

Description

technical field [0001] The invention relates to the technical field of thermal protection, in particular to a moisture-proof modified phenolic heat insulating material and a preparation method. Background technique [0002] The description of the background technology in the present invention belongs to the related art related to the present invention, and is only used to illustrate and facilitate the understanding of the invention content of the present invention, and should not be construed as the applicant's explicit belief or presumption that the applicant believes that the present invention is the first application of the present invention. the prior art of the filing date. [0003] Porous thermal insulation materials represented by phenolic thermal insulation materials, especially phenolic aerogel composite materials, have many advantages such as ablation resistance, light weight, excellent thermal insulation performance, stable performance, and low cost. It is widely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/36C08J9/40C08L61/06
CPCC08J9/36C08J9/405C08J2361/06
Inventor 黄红岩张贝贝刘圆圆张杨权成李文静张凡杨洁颖张昊赵英民裴雨辰
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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