Organic-inorganic coating for ceramic antenna cover moisture resistance and preparation method thereof

A ceramic antenna and inorganic coating technology, applied in coatings, polyether coatings, etc., can solve the problems of high carbon content, complex process, good moisture resistance, etc., achieve low dielectric coefficient, controllable reaction conditions, good durability Effect of High Temperature Oxidation and Moisture Resistance

Inactive Publication Date: 2019-02-12
湖北三江航天江北机械工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic coating has good moisture-proof performance and the preparation process is simple, but the carbon content is high, and it will be carbonized at high temperature. Carbon has a strong radio wave absorption ability, and the radio wave transmission ability wi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) Surface modification of the radome: Soak the fiber-reinforced ceramic-based radome in 1% n-hexane solution of silane coupling agent (3-mercaptopropyl)trimethoxysilane for 1h, then wash with n-hexane, n-hexane / ethanol (volume ratio is 40% / 60%), ethanol is ultrasonically treated for 10min, and dried at 100°C;

[0033] 2) UV cross-linking curing coating: Vinyl polydimethylsiloxane, vinyl octahedral oligomeric silsesquioxane, oligoethylene glycol dimethacrylate, photoinitiator, solvent according to Mass percent is made into solution, specifically as follows:

[0034] Vinyl Dimethicone: 20%;

[0035] Vinyl octahedral oligomeric silsesquioxane: 30%;

[0036] Oligoethylene glycol dimethacrylate 6%;

[0037] Benzoin dimethyl ether: 1%;

[0038] Tetrahydrofuran: balance;

[0039] The molecular weight of oligoethylene glycol dimethacrylate is 198.

[0040] Then the mixed solution was sprayed on the surface of the substrate, placed in a UV cross-linking instrument at 365...

Embodiment 2

[0043] 1) Surface modification of the radome: Soak the fiber-reinforced ceramic-based radome in 8% silane coupling agent γ-mercaptopropyltriethoxysilane n-hexane solution for 5h, then use n-hexane, n-hexane / Ethanol (volume ratio of 40% / 60%), ethanol sonication for 27min, drying at 125°C;

[0044] 2) UV cross-linking curing coating: Vinyl polydimethylsiloxane, vinyl octahedral oligomeric silsesquioxane, oligoethylene glycol dimethacrylate, photoinitiator, solvent according to Mass percent is made into solution, specifically as follows:

[0045] Vinyl Dimethicone: 40%;

[0046] Vinyl octahedral oligosilsesquioxane: 15%;

[0047] Oligoethylene glycol dimethacrylate 4%;

[0048] 1-Hydroxycyclohexyl phenyl ketone: 0.5%;

[0049] Toluene: balance;

[0050] The molecular weight of oligoethylene glycol dimethacrylate is 396.

[0051] Subsequently, the mixed solution was sprayed on the surface of the substrate, placed in a UV cross-linking instrument at 365 nm, 90 W, and cross-l...

Embodiment 3

[0054] 1) Surface modification of the radome: Soak the fiber-reinforced ceramic-based radome in a n-hexane solution of 15% silane coupling agent γ-mercaptopropyltriethoxysilane for 10 h, then wash it with n-hexane, n-hexane / Ethanol (volume ratio of 40% / 60%), ethanol sonication for 45min, drying at 150°C;

[0055] 2) UV cross-linking curing coating: Vinyl polydimethylsiloxane, vinyl octahedral oligomeric silsesquioxane, oligoethylene glycol dimethacrylate, photoinitiator, solvent according to Mass percent is made into solution, specifically as follows:

[0056] Vinyl Dimethicone: 60%;

[0057] Vinyl octahedral oligosilsesquioxane: 2%;

[0058] Oligoethylene glycol dimethacrylate 2%;

[0059] 2-Hydroxy-2-methyl-1-phenyl-1-propanone: 0.01%;

[0060] Methanol: balance;

[0061] The molecular weight of oligoethylene glycol dimethacrylate is 594.

[0062] Subsequently, the mixed solution was sprayed on the surface of the substrate, placed in a UV cross-linking instrument at 3...

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PUM

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Abstract

The invention discloses an organic-inorganic coating for ceramic antenna cover moisture resistance and a preparation method thereof. The coating is prepared from the following components in percentageby mass: 20-60% of vinyl polydimethylsiloxane, 2-30% of vinyl octahedral oligomeric silsesquiloxane, 2-6% of oligoethylene glycol dimethacrylate, 0.01-1% of a photoinitiator, and the balance of solvent. The prepared moisture-proof coating is good in moisture resistance effect, is not liable to carbonize, is good in coating film-forming property, is low in dielectric coefficient, is good in high temperature resistance, and can realize moisture resistance, high temperature resistance and wave-transmitting property of an antenna cover in the aerospace field of an antenna cover; and the inventionpreparation method is simple and convenient in preparation process, isadopts easily available in materials, is simple in preparation method, and is controllable in reaction condition.

Description

technical field [0001] The invention relates to a missile radome coating, in particular to an organic-inorganic coating for ceramic radome moisture-proof and a preparation method thereof. Background technique [0002] Ceramic materials are a kind of inorganic non-metallic materials made of natural or synthetic compounds after molding and high-temperature sintering. They have the advantages of small expansion coefficient, low dielectric constant, high temperature resistance and thermal shock resistance. Ceramic materials can be divided into oxide ceramics, nitride ceramics, carbide ceramics, cermets, etc. according to their main components. Among them, oxide ceramics often have a main component of SiO 2 Quartz fiber yarn. [0003] The missile radome is a facility to protect the normal operation of the radar antenna system. It is an integral part of the missile body and the radar system. It needs to carry the missile's aerodynamic load, aerodynamic heating and the harsh envir...

Claims

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Application Information

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IPC IPC(8): C09D4/02C09D183/07C09D171/02C04B41/84
CPCC04B41/4961C04B41/84C09D4/00C09D171/02C09D183/04C08L83/04C08L71/02C04B41/46
Inventor 李川吴广力陈海昆王芬李瑞杰刘俊君
Owner 湖北三江航天江北机械工程有限公司
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