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Low-density organosilicon anti-heat insulation integrated coating and preparation method thereof

A silicone, low-density technology, used in coatings, fire-retardant coatings, etc., can solve problems such as poor wear resistance, high density, and longevity, and achieve a three-dimensional thermal insulation integrated structure, high wear resistance and durability. , the effect of increasing the payload

Active Publication Date: 2021-06-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But many of these materials have longevity issues that prevent them from being used in systems that are heavily used or may be stored for years before use
In addition, coatings with strong ablation resistance tend to have a higher density, which limits the payload of the aircraft; while the currently known low-density anti-heat insulation integrated coatings generally have poor wear resistance. It is easy to be damaged, so special treatment is required for the coating, which means that the manufacturing process is complicated and the cost increases

Method used

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  • Low-density organosilicon anti-heat insulation integrated coating and preparation method thereof
  • Low-density organosilicon anti-heat insulation integrated coating and preparation method thereof
  • Low-density organosilicon anti-heat insulation integrated coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] A certain amount of DC184 silicone rubber, curing agent and DC200 diluent with a viscosity of 50cs were weighed and mixed, and ultrasonic vibration was applied during the mixing process to remove air bubbles, and then stood for 2 hours to allow pre-polymerization to occur. Then the above mixture with a density of 250kg / m 3 The K25 hollow glass microspheres are added into the reaction kettle, mechanically stirred until completely mixed, then stirred in a vacuum state for 0.5-1h to obtain a mixed slurry. The mass ratio of DC184, curing agent, DC200 and K25 glass beads is 45.45:4.55:20:20.

[0031] Pour the mixed slurry into a custom-made stainless steel mold, and continue to apply ultrasonic vibration to remove air bubbles until the slurry completely fills the mold, then seal the mold, and place it in an oven at 80°C for 12 hours of curing reaction and aging After forming; prepare a low-density organic silicon anti-heat insulation integrated coating with a density of 595...

Embodiment 2

[0033] A certain amount of DC184 silicone rubber, curing agent and DC200 diluent with a viscosity of 50cs were weighed and mixed, and ultrasonic vibration was applied during the mixing process to remove air bubbles, and then stood for 2 hours to allow pre-polymerization to occur. Then the above mixture with a density of 250kg / m 3 The K25 hollow glass microspheres and chopped quartz fibers are added into the reaction kettle, mechanically stirred until they are completely mixed, and then stirred in a vacuum state for 0.5-1h to obtain a mixed slurry. Among them, the mass ratio of DC184, curing agent, DC200, K25 glass beads and chopped quartz fiber is 45.45:4.55:20:20:4

[0034] Pour the mixed slurry into a custom-made stainless steel mold, and continue to apply ultrasonic vibration to remove air bubbles until the slurry completely fills the mold, then seal the mold, and place it in an oven at 80°C for 12 hours of curing reaction and aging After forming; prepare a low-density org...

Embodiment 3

[0036] A certain amount of DC184 silicone rubber, curing agent and DC200 diluent with a viscosity of 50cs were weighed and mixed, and ultrasonic vibration was applied during the mixing process to remove air bubbles, and then stood for 2 hours to allow pre-polymerization to occur. Then the above mixture with a density of 250kg / m 3 K25 hollow glass microspheres, chopped quartz fibers, boron oxide and aluminum oxide were added into the reaction kettle, mechanically stirred until completely mixed, then stirred under vacuum for 0.5-1h to obtain a mixed slurry. The mass ratio of DC184, curing agent, DC200, K25 glass beads, chopped quartz fiber and boron oxide is 45.45:4.55:20:20:4:3.

[0037] Pour the mixed slurry into a custom-made stainless steel mold, and continue to apply ultrasonic vibration to remove air bubbles until the slurry completely fills the mold, then seal the mold, and place it in an oven at 80°C for 12 hours of curing reaction and aging After forming; prepare a low...

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Abstract

The invention relates to a low-density organic silicon heat-insulating integrated coating and a preparation method thereof. The coating comprises the following components in parts by weight: 45-55 parts of a substrate, 15-25 parts of a thinner, and 13-32 parts of a weight-reducing body , 0-21 parts of additives. It is prepared through the steps of preparing silicone solution, pre-polymerization reaction, preparing mixed slurry, curing and molding. Compared with the prior art, the coating prepared by the present invention has excellent thermal insulation performance, good ablation resistance in a low heat flow environment, high mechanical durability and hydrophobicity, simple preparation process, low cost, and high density It is low and has a certain degree of flexibility, which makes it highly designable and easy to size and cut later. As a whole, it meets the basic requirements for integrated anti-heat insulation. It can be applied on the surface of the spacecraft as an ablation-resistant layer, or it can be filled between the spacecraft’s heat-insulating tiles as a caulking material.

Description

technical field [0001] The invention belongs to the field of coating materials, and in particular relates to a low-density organic silicon anti-heat insulation integrated coating and a preparation method thereof. Background technique [0002] As an important thermal protection material, anti-heat insulation integrated coating is widely used to protect and isolate structures from being severely affected by extreme thermal conditions such as high temperature and rapid temperature rise. For example, when an aerospace vehicle passes through, leaves, and enters the atmosphere at high speed, the high-speed airflow is compressed and rubbed near the outer surface of the aircraft, and the kinetic energy is converted into heat energy, resulting in a rapid rise in temperature and convective heat transfer with the outer surface of the aircraft. , the outer surface of the aircraft and its substructure will bear high aerodynamic heat load, the coating can be applied to the surface affecte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D183/04C09D5/18C09D7/61
Inventor 龙东辉姚鸿俊董炜
Owner EAST CHINA UNIV OF SCI & TECH