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Preparation method and application of pressure stress coating of radar antenna housing or antenna window

A radome and antenna window technology, applied in the coating and other directions, can solve the problems of high carbon residue rate, affect the wave transmission performance, slow curing and other problems, achieve good dielectric properties, improve mechanical properties and heat resistance, reduce The effect of moisture absorption

Active Publication Date: 2019-11-26
JIANGXI JIAJIEXINDA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The organic coating has the characteristics of simple process and excellent waterproof performance, but the curing is slow, and it is prone to thermal decomposition at high temperature, and the residual carbon rate is high, which affects the wave transmission performance; the inorganic coating has good high temperature resistance and does not contain impurity carbon, but Often the process is complex and difficult to shape

Method used

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  • Preparation method and application of pressure stress coating of radar antenna housing or antenna window
  • Preparation method and application of pressure stress coating of radar antenna housing or antenna window

Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0030] 1. Add 2wt.% polyvinyl alcohol (PVA), 2wt.% boron carbide (B 4 C) powder and 1wt.% sodium dodecylbenzenesulfonate, heated to 96°C and stirred until PVA is completely dissolved, which is recorded as mixed solution 1.

[0031] 2. Take an appropriate amount of mixed solution 1, and add tetrachlorosilane (SiCl 4 ), the water bath was kept at 50° C. and stirred for 1 hour to obtain the mixed solution 2. Among them, SiCl 4 with B 4 The mass ratio of C is 20:1.

[0032] 3. Add 20wt.% xylene and 2wt.% antioxidant to the monosilane, and stir until the silicone resin is completely dissolved in the organic solvent to obtain a mixed solution 3.

[0033] 4. Add the mixed solution 3 to the mixed solution 2 dropwise, keep the water bath at 50°C and stir until most of the water and organic solvents are volatilized, and dry in a muffle furnace at 50°C for 48 hours to obtain the mixture 4. Among them, silicone resin and SiCl 4 The mass ratio is 1:1.

[0034] 5. Take out the mixtur...

specific Embodiment 2

[0037] 1. Add 5wt.% polyvinyl alcohol (PVA), 5wt.% boron carbide (B 4 C) Powder and 1wt.% Tween 80, heated to 92°C and stirred until PVA was completely dissolved, which was recorded as mixed solution 1.

[0038] 2. Take an appropriate amount of mixed solution 1, and add tetrachlorosilane (SiCl 4 ), kept at 50°C in a water bath and stirred for 2 hours to obtain a mixed solution 2. Among them, SiCl 4 with B 4 The mass ratio of C is 10:1.

[0039] 3. Add 50wt.% acetone and 1wt.% antioxidant to the tetraethyl orthosilicate silicone resin, and stir until the silicone resin is completely dissolved in the organic solvent to obtain a mixed solution 3.

[0040] 4. Add the mixed solution 3 to the mixed solution 2 dropwise, keep the water bath at 50°C and stir until most of the water and organic solvents are volatilized, and dry in a muffle furnace at 50°C for 24 hours to obtain the mixture 4. Among them, silicone resin and SiCl 4 The mass ratio is 2:1.

[0041] 5. Take out the mi...

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Abstract

The invention provides a preparation method of a pressure stress coating of a radar antenna housing or antenna window. B4C particles and a surfactant are uniformly dispersed by heating and physical stirring processes with an aqueous solution of PVA as an adhesive material to make SiCl4 sufficiently and uniformly hydrolyzed; and the pressure stress layer is formed on the surface of the antenna housing / antenna window without affecting a substrate material by utilizing hydrolysis of SiCl4 and high-temperature sintering of an organic silicone resin to relieve local tensile stress of the surface ofthe antenna housing / antenna window material in the stress process. The pressure stress coating can greatly reduce the moisture absorption performance of the antenna housing / antenna window and improvethe mechanical properties and the heat resistance of the antenna housing / antenna window, and has good dielectric properties. The surface of the radar antenna housing / antenna window is coated with theprepared coating to increase the strength by 20% or more, and the use requirements of the radar antenna housing / antenna window in a harsh environment can be met.

Description

technical field [0001] The invention belongs to the field of high-tech coating preparation, and in particular relates to a radar radome or antenna window compressive stress coating and a preparation method thereof. Background technique [0002] Quartz fiber reinforced quartz matrix composites (SiO 2 / SiO 2 ) Due to its good mechanical properties and dielectric properties, it has shown great application prospects in the field of radome / antenna window, and has been successfully applied to the US "Trident" submarine missile. However, due to SiO 2 Its own porous structure and hydrophilic groups on the surface, SiO 2 / SiO 2 The radome / antenna window is very easy to absorb moisture in the air, which affects the mechanical properties and wave transmission performance of the material. Preparation of coating on the surface of radome / antenna window is a common means to improve its moisture-proof performance. Coatings can generally be divided into organic coatings and inorganic c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D129/04C09D7/61C09D7/63
CPCC09D129/04C09D7/61C09D7/63C08K3/36C08K3/38C08K5/5403C08K5/5415
Inventor 吴宝林侯振华
Owner JIANGXI JIAJIEXINDA NEW MATERIAL TECH CO LTD
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