Light-weight low-conductivity ablation shape maintaining heat-resistant coating and preparation and application thereof

A heat-resistant coating and lightweight technology, applied in the direction of epoxy resin coatings, coatings, and devices for coating liquid on the surface, can solve the problem of difficult to achieve surface structure dimensions of aerospace products, changes in the structure and shape of aerospace products, and impact Aerospace products work performance and other issues, to achieve the effect of solving the problem of high-temperature aerodynamic scour heat protection, improving process performance, and excellent comprehensive performance

Inactive Publication Date: 2019-11-12
贵州航天风华精密设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The physical and chemical changes of the ablative heat-insulation coating under the condition of high-temperature scouring cause the coating to ablate and take away the heat, so as to achieve the purpose of protecting the surface structure of aerospace products; however, it is difficult to realize the surface structure of aerospace products Dimensional shape, it is easy to cause changes in the structure and shape of aerospace products, which in turn affects the performance of aerospace products

Method used

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  • Light-weight low-conductivity ablation shape maintaining heat-resistant coating and preparation and application thereof
  • Light-weight low-conductivity ablation shape maintaining heat-resistant coating and preparation and application thereof
  • Light-weight low-conductivity ablation shape maintaining heat-resistant coating and preparation and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: coating formula sees table 3

[0035] Table 3 Heat-resistant coating formula

[0036]

[0037] The preparation method of described heat-resistant paint specifically comprises the following processes:

[0038] (1) Premixing: Weigh 1152 organic silicon resin, E51 epoxy resin, BP-3 acrylic resin, nano fumed silica, hollow glass microspheres, additives and 80% solvent by weight and add to the dispersed sand Mill, stir and mix evenly with a nylon rod;

[0039] (2) Dispersion: Disperse the pre-mixed heat-resistant coating at a speed of 600-800r / min for 50min-60min, and then disperse at a speed of 1000-1600r / min for 100min-120min; Over 35°C, to ensure that the coating system is evenly mixed;

[0040] (3) Grinding: Install the grinding medium (glass beads or zirconia beads of φ1.5~φ3) in the horizontal sand mill, set the temperature and pressure, and carry out the two coatings dispersed in step (2). Circular sanding; during sanding, the temperature of the m...

Embodiment 2

[0044] Get the prepared coating of embodiment 1 and carry out performance test, and test process specifically comprises the following steps:

[0045] (a) Pretreatment of the test piece: the test piece (aluminum test piece anodized, magnesium test piece oxidized) was cleaned with ethyl acetate or acetone.

[0046] (b) Coating preparation: Weigh 1000g of component A of the heat-resistant coating, then weigh 30g to 50g of component B, mix components A and B evenly, and add solvent to adjust to a viscosity that is easy to spray;

[0047](c) Spraying: choose a small spray gun for spraying, the air pressure is controlled at about 0.3MPa, the distance of the spray gun is about 20cm-30cm, and the thickness of the single-layer wet film is 30μm-50μm; the thickness of the conventional performance and heat-resistant coating is controlled at 30μm-50μm, The thickness of the thermal insulation coating is controlled at 0.8mm~1.0mm, and the thickness of the thermal performance test coating is ...

Embodiment 3

[0053] The light-weight low-conductivity ablation-dimensional heat-resistant coating prepared in Example 1 is used for the thermal protection of the cabin structure of aerospace products, specifically comprising the following steps:

[0054] (a) Pretreatment of the cabin body: cleaning the outer surface of the cabin with ethyl acetate or acetone to oxidize the magnesium alloy on the outer surface of the cabin;

[0055] (b) Process protection spraying: Spray light-weight low-conductivity ablation-dimensional heat-resistant paint within 24 hours after the cabin is oxidized as process protection;

[0056] (c) Spraying: Weigh component A of the heat-resistant coating: component B = 100: 5 to 7, mix components A and B evenly, add solvent to adjust to a viscosity that is easy to spray; then select a large spray gun to spray, air pressure Control at about 0.35MPa, spray gun distance about 30cm, single-layer wet film thickness between 30μm and 50μm, and coating thickness between 0.8mm...

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Abstract

The invention belongs to the technical field of special coatings, particularly relates to a light-weight low-conductivity ablation shape maintaining heat-resistant coating and preparation and application thereof. The light-weight low-conductivity ablation shape maintaining heat-resistant coating is prepared from a component A and a component B which are packed separately, and the component A and the component B are mixed according to a certain proportion before spraying; the component A is prepared from the raw materials of organic silicon resin, epoxy resin, acrylic resin,light-weight low-conductivity nanometer filler, ablation shape maintaining filler, a solvent and an auxiliary agent; and the component B is prepared from an ammonia curing agent of 3%-5% of the mass of the component A. According to the heat-resistant coating, the heat conductivity coefficient is low, the density is low, the bonding strength is high, the purpose of ablation shape maintaining is achieved, the comprehensive performance is excellent, and the heat-resistant problem of high-temperature pneumatic scouring of aspaceflight product cabin body is effectively solved; and the heat-resistant coating is used for heat protection of a spaceflight product cabin body structure, and it is proved by tests that the performance indexes of the heat-resistant coating completely meet the requirements of engineering application of a certain spaceflight product.

Description

technical field [0001] The invention belongs to the technical field of special coatings, in particular to a light-weight low-conductivity ablation-dimensional heat-resistant coating and its preparation and application. Background technique [0002] With the development of advanced aerospace technology, the comprehensive performance of aerospace products in terms of high maneuverability, large overload, flight speed, hit accuracy, and defense penetration capability has gradually improved. Designers must take into account the weight of the carrier, the structural strength of the material, and the safety of the internal components of the carrier. sex. The cabins of aerospace products are mostly made of alloy materials, and the mechanical properties of cabin structural materials will drop sharply with the increase of temperature. Thermal insulation protection for aerospace products is an effective way to solve the above problems. [0003] The working temperature of aerospace pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D183/04C09D163/00C09D133/04C09D7/61B05D1/02B05D3/00B05D3/02B05D5/00B05D7/24
CPCB05D1/02B05D3/002B05D3/0254B05D5/00B05D7/24C08K2201/011C08L2205/03C09D183/04C09D7/61C09D7/70C08L63/00C08L33/04C08K7/28C08K3/36
Inventor 张绍波杨晓明黄田燕
Owner 贵州航天风华精密设备有限公司
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