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High-temperature-resistant wave-absorbing coating and preparation method and application thereof

A wave-absorbing coating and high-temperature-resistant technology, which is applied to radiation-absorbing coatings, anti-corrosion coatings, and fire-resistant coatings, can solve problems such as unsatisfactory impedance matching characteristics, large graphene dielectric constant, and poor wave-absorbing performance, and achieve anti-corrosion And excellent salt spray resistance, high hardness, good adhesion effect

Active Publication Date: 2019-10-22
IANGSU JINLING SPECIAL PAINT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Graphene's large specific surface area, layered structure, excellent dielectric properties, mechanical properties, and light weight have attracted much attention in the field of electromagnetic wave absorption, but pure graphene has a large dielectric constant and cannot meet the impedance matching characteristics. , leading to poor absorbing performance, combining it with magnetic materials can obtain electromagnetic wave absorbing materials with excellent comprehensive performance
[0004] At present, most of the absorbing materials are concentrated at room temperature absorbing materials, and there are relatively few studies on high-temperature absorbing materials, especially high-temperature absorbing materials above 300 °C

Method used

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  • High-temperature-resistant wave-absorbing coating and preparation method and application thereof
  • High-temperature-resistant wave-absorbing coating and preparation method and application thereof
  • High-temperature-resistant wave-absorbing coating and preparation method and application thereof

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preparation example Construction

[0023] In some preferred embodiments, the Fe 3 o 4 -Graphene-SiO 2 The preparation method of composite nanoparticles comprises:

[0024] FeCl 3 ·6H 2 O, sodium acetate and graphene slurry are mixed in the mixed solution in ethylene glycol and diethylene glycol, then carry out hydrothermal reaction in the sealed reactor, after the reaction finishes, collect the obtained mixed solution by magnet The solid is washed and dried to obtain Fe 3 o 4 - Graphene nanocomposites, wherein the hydrothermal reaction temperature is 180-190° C., and the time is 7-9 hours;

[0025] And, the obtained 0.25~0.29g Fe 3 o 4 - Graphene nanocomposites are dispersed in a mixed solution of 70-75mL ethylene glycol, 30-32mL deionized water and 1.2-1.5mL ammonia water, then add 0.35-0.41mL tetraethyl orthosilicate under stirring conditions, and React for 12-15 hours, wash with water, and dry to obtain Fe 3 o 4 -Graphene-SiO 2 composite nanoparticles.

[0026] Further, the graphene slurry inclu...

Embodiment 1

[0066] Mix 1.5g of dilute nitric acid solution (the concentration of nitric acid is 0.5mol / L) with 30g of silica sol (purchased from Grace Company, pH=8.0) to adjust the pH value to 3.0, add 10g of nano-silica dispersion (purchased from Shaoxing Yu up to chemical industry) to stir evenly to obtain the first mixture. Add 20g of siloxane (purchased from Dow Corning Co.) into a three-necked flask, reflux and condense, add the first mixture dropwise under stirring conditions, react at 80°C for 8 hours after the dropwise addition, cool to room temperature, and add to the obtained Add 5 g of ethylene glycol to the mixed solution to obtain the second mixture. Then add 2g dispersant BYK-165 (purchased from Lubrizol Company), 1g anti-sedimentation agent bentonite (purchased from Degussa Company, R972), 3g attapulgite (purchased from Changzhou) to the second mixture under the condition of stirring Naou Technology), 10g glass powder (purchased from Xianyang Yinghe, 2000 mesh) and 30-35g...

Embodiment 2

[0068] Mix 1.8g of dilute nitric acid solution (the concentration of nitric acid is 0.5mol / L) with 43g of silica sol (purchased from Grace Company, pH=8.0) to adjust the pH value to 3.0, add 10g of nano-silica dispersion (purchased from Shaoxing Yu up to chemical industry) to stir evenly to obtain the first mixture. Add 20g of siloxane (purchased from Dow Corning Co.) into a three-necked flask, reflux and condense, add the first mixture dropwise under stirring conditions, react at 80°C for 8 hours after the dropwise addition, cool to room temperature, and add to the obtained Add 5 g of ethylene glycol to the mixed solution to obtain the second mixture. Then add 1.2g dispersant BYK-165 (available from Lubrizol), 2g anti-sedimentation agent bentonite (available from Degussa, R972), 2g attapulgite (available from Changzhou Naou Technology), 5g glass powder (purchased from Xianyang Yinghe, 2000 mesh) and 30g Fe 3 o 4 -Graphene-SiO 2 Composite nanoparticles (see Example 1) are ...

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Abstract

The invention discloses a high-temperature resistant wave-absorbing coating and a preparation method and application thereof. The high-temperature resistant wave-absorbing coating mainly comprises a high-temperature resistant wave-absorbing filler, silica sol, nano-silica dispersion, an acidic medium, glass powder, ethylene glycol, a dispersant, an anti-settling agent, siloxane and the like, wherein the high-temperature resistant wave-absorbing filler comprises Fe3O4-graphene- SiO2 composite nanoparticles. The high-temperature resistant wave-absorbing coating can be naturally dried at room temperature, and can resist high temperature of 100-400 DEG C for a long time, and a formed coating layer has good adhesion with a substrate, high hardness, wide wave-absorbing frequency band, and excellent corrosion resistance and salt fog resistance.

Description

technical field [0001] The invention belongs to the field of high-temperature-resistant wave-absorbing, and in particular relates to a high-temperature-resistant wave-absorbing coating and its preparation method and application. Background technique [0002] Absorbing materials refer to a class of materials that can absorb and attenuate incident electromagnetic waves, and convert their electromagnetic energy into heat or other forms of energy to dissipate or make electromagnetic waves disappear due to interference effects. According to the electromagnetic wave loss mechanism, absorbing materials can be divided into resistive loss type, dielectric loss type and magnetic loss type. Traditional absorbing materials rely on their own resistance loss and magnetic loss to absorb and attenuate incident electromagnetic waves and emit them in the form of thermal effects. Because of their low adaptability in harsh environments and poor absorbing performance in low-frequency bands, scie...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D1/00C09D183/04C09D5/08C09D5/32C09D7/61
CPCC08G77/04C08K3/40C09D1/00C09D4/00C09D5/08C09D5/18C09D5/32C09D183/04C09D7/61
Inventor 王立平刘栓蒲吉斌郭小平赵海超孙立三卢光明
Owner IANGSU JINLING SPECIAL PAINT CO LTD
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