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Ablation-resisting light silicone rubber thermal insulation coating

A heat-insulating coating and ablation-resistant technology, which is applied in coatings and other directions, can solve problems such as the difficulty in meeting the lightweight requirements of the aerospace field, the low bonding strength between ablation products and the substrate, and the inability to withstand mechanical vibrations caused by pneumatic scouring, etc., to achieve Short vulcanization time, high production efficiency, and reduced density

Active Publication Date: 2019-07-26
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing ablation-resistant coatings are made by blending silicone resin and ablation-resistant fillers. On the one hand, due to the limitation of the matrix material, this kind of heat-insulating coating has a high density (up to 1g / cm 2 ), it is difficult to meet the lightweight requirements in the aerospace field, which will add unnecessary load to the rocket body; on the other hand, due to the limitation of materials, the current ablation-resistant coating generally has a short service time and unsatisfactory ablation resistance And the bonding strength between the ablation product and the substrate is too low to withstand high-intensity pneumatic scour and mechanical vibration
In addition, the existing ablation-resistant coatings have relatively high viscosity, and are usually applied by brushing or scraping. The uniformity of the coating is difficult to guarantee, the construction is difficult, and the operation is cumbersome, which greatly improves the construction efficiency. cost

Method used

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  • Ablation-resisting light silicone rubber thermal insulation coating
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Experimental program
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Effect test

Embodiment 1

[0040] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0041] The ablation-resistant lightweight silicone rubber heat-insulating coating has a heat-insulating structure with two layers of heat-insulating structure: the outer layer is the ablation-resistant layer, which is taken away by the mass loss caused by physical changes or chemical reactions (generally, gas produced by decomposition reactions) Pray for heat insulation effect; the inner layer is a low thermal conductivity layer, which reduces longitudinal heat conduction through extremely low thermal conductivity, thereby reducing the temperature of the substrate. Each coat of paint consists of three components. The thickness ratio of the anti-ablation layer and the low thermal conductivity layer material is 5:1.

[0042] (1) Preparation and ratio of low thermal conductivity layer

[0043] The main components of the insulation layer include A, B and C ...

Embodiment 2

[0083] The ablation-resistant lightweight silicone rubber heat-insulating coating has a heat-insulating structure with two layers of heat-insulating structure: the outer layer is the ablation-resistant layer, which is taken away by the mass loss caused by physical changes or chemical reactions (generally, gas produced by decomposition reactions) Pray for heat insulation effect; the inner layer is a low thermal conductivity layer, which reduces longitudinal heat conduction through extremely low thermal conductivity, thereby reducing the temperature of the substrate. Each coat of paint consists of three components. The thickness ratio of the material of the ablation-resistant layer and the low thermal conductivity layer is 10:1.

[0084] (1) Preparation and ratio of low thermal conductivity layer

[0085] The main components of the low thermal conductivity layer include A, B and C components. The ingredients of component A are as follows: 60 parts of vinyl polysiloxane and 0.0...

Embodiment 3

[0112] The ablation-resistant lightweight silicone rubber heat-insulating coating has a heat-insulating structure with two layers of heat-insulating structure: the outer layer is the ablation-resistant layer, which is taken away by the mass loss caused by physical changes or chemical reactions (generally, gas produced by decomposition reactions) Pray for heat insulation effect; the inner layer is a low thermal conductivity layer, which reduces longitudinal heat conduction through extremely low thermal conductivity, thereby reducing the temperature of the substrate. Each coat of paint consists of three components. The thickness ratio of the anti-ablation layer and the material of the low thermal conductivity layer is 8:5.

[0113] (1) Preparation and ratio of low thermal conductivity layer

[0114] The main components of the insulation layer include A, B and C components. The ingredients of component A are as follows: 70 parts of vinyl polysiloxane and 0.06 parts of chloropla...

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Abstract

The invention relates to an ablation-resisting light silicone rubber thermal insulation coating. The ablation-resisting light silicone rubber thermal insulation coating comprises an inner low-thermal-conductivity layer and an outer ablation-resisting layer at a thickness ratio of 2-10:1-5, wherein the ablation-resisting layer is prepared from three components and releases heat via mass loss; the low-thermal-conductivity layer is prepared from three components and reduces longitudinal heat conduction through ultra-low thermal conductivity. Compared with the prior art, the ablation-resisting light silicone rubber thermal insulation coating has the advantages of being low in mass ablating rate, high in heat resistance and long in service life at high temperatures and can effectively resist impact of heat flow of 500 kW / m2 and above, reduce temperature increase of base plates and prevent base materials from losing efficacy due to high-temperature erosion.

Description

technical field [0001] The invention relates to the field of ablation-resistant ultra-high temperature heat insulation, in particular to an ablation-resistant lightweight silicone rubber heat-insulation coating. Background technique [0002] Since the 21st century, aerospace and national defense technology has been paid more and more attention by various countries, and ablation-resistant coatings have been used more and more. For example, during the ignition flight of a rocket, the engine releases a large amount of heat when it is working, and the temperature will reach 2000-2500°C in a short period of time, and its shell is generally made of metal steel or aluminum, and its melting point is much lower than this working temperature. Without a thermally protective coating around its outer shell, the rocket body material would not be able to withstand such high temperatures during its flight service, with disastrous consequences for the rocket. Another example is that a multi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/07C09D183/05C09D7/61
CPCC08K2003/2224C08K2003/2227C08K2003/2241C08L2201/08C08L2205/025C08L2205/03C09D183/04C09D7/61C09D7/70C08L83/04C08K3/22C08K7/24C08K7/28C08K3/34
Inventor 张瑞吉孙序成郭芳威李慧晓赵晓峰
Owner SHANGHAI JIAO TONG UNIV
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