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Graphene/nano ferrite based water electromagnetic shielding paint and preparation method thereof

A technology of electromagnetic shielding coating and nano-ferrite, which is applied in conductive coatings, epoxy resin coatings, polyurea/polyurethane coatings, etc., can solve the problems of poor shielding efficiency of electromagnetic shielding coatings, achieve excellent wave-absorbing performance, and improve absorption Wave performance, overcome the effect of cumbersome operation

Active Publication Date: 2015-12-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, in order to solve the problem of poor shielding effectiveness of electromagnetic shielding coatings with a single conductive substance in the prior art, the present invention discloses a water-based electromagnetic shielding coating with conductive and magnetically permeable composite materials as filler and a preparation method thereof, so as to have both electrical and magnetic properties. Composite wave-absorbing materials with loss and magnetic loss are used as fillers, and graphene and ferrite nanomaterials are combined to prepare graphene / nano-ferrite composites that have both the conductivity of graphene and the good magnetic properties of nano-ferrite. Absorbing materials, and then compounded with resin and other additives to prepare electromagnetic shielding coatings, can make up for the shortcomings of graphene that only has conductive loss but no magnetic loss

Method used

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  • Graphene/nano ferrite based water electromagnetic shielding paint and preparation method thereof
  • Graphene/nano ferrite based water electromagnetic shielding paint and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The formulation of the water-based electromagnetic shielding coating is:

[0017] Electromagnetic shielding filler: 10%

[0018] Water-based acrylate: 70%

[0019] Purified water: 16%

[0020] Sodium Lauryl Sulfonate: 3%

[0021] Coalescing agent lauryl alcohol: 1%

[0022] Electromagnetic shielding filler preparation: accurately weigh 0.27gFeCl according to stoichiometry 3 ·6H 2 O (1mmol), 0.18gCoCl 2 ·6H 2 O (0.5 mmol) was dissolved in 30 mL of water to prepare a solution, added to 2 mL of 15 mg / mL graphene oxide dispersion, and ultrasonicated for 30 minutes. Use sodium hydroxide solution (5M) to adjust the pH to 11, and finally add the reducing agent Na 2 S 2 o 3 ·5H 2 O, put into a reaction kettle, seal it, place it in an oven, and react at 150°C for 15 hours. After washing and centrifuging, the graphene / nano-cobalt ferrite composite material is obtained directly. figure 1 It is a transmission electron microscope (HitachiHT7700) photo of the synthetic m...

Embodiment 2

[0025] The formulation of the water-based electromagnetic shielding coating is:

[0026] Electromagnetic shielding filler: 10%

[0027] Water-based polyurethane: 68%

[0028] Purified water: 16%

[0029] Sodium Lauryl Sulfate: 5%

[0030] Coalescing agent lauryl alcohol ester: 1%

[0031] Electromagnetic shielding filler preparation: accurately weigh 0.48gZn(NO 3 ) 2 ·6H 2O(1.6mmol) and 1.31gFe(NO 3 ) 3 9H 2 O (3.2 mmol) was dissolved in 30 mL of water to prepare a solution, added to 2 mL of 20 mg / mL graphene oxide dispersion, and ultrasonicated for 30 minutes. Use sodium hydroxide solution (5M) to adjust the pH to 11, and finally add the reducing agent Na 2 S 2 o 3 ·5H 2 O, put into a reaction kettle, seal it, place it in an oven, and react at 150°C for 15 hours. After washing and centrifuging, the graphene / nano-copper ferrite composite material is obtained directly.

[0032] Preparation of water-based polyurethane electromagnetic shielding coating: add the pre...

Embodiment 3

[0034] The formulation of the water-based electromagnetic shielding coating is:

[0035] Electromagnetic shielding filler: 20%

[0036] Water-based epoxy resin: 60%

[0037] Purified water: 16%

[0038] OP-10: 3%

[0039] Coalescent Dipropylene Glycol Monobutyl Ether: 1%

[0040] Electromagnetic shielding filler preparation: accurately weigh 0.27gFeCl according to stoichiometry 3 ·6H 2 O (1mmol), 0.06gNiCl 2 ·6H 2 O (0.25mmol), 0.09gCoCl 2 ·6H 2 O (0.25 mmol) was dissolved in 30 mL of water to prepare a solution, added to 2 mL of 15 mg / mL graphene oxide dispersion, and ultrasonicated for 30 minutes. Use sodium hydroxide solution (5M) to adjust the pH to 11, and finally add the reducing agent Na 2 S 2 o 3 ·5H 2 O, put into a reaction kettle, seal it, put it in an oven, and react at 150°C for 24 hours. After washing and centrifuging, the graphene / nano-cobalt-nickel ferrite composite material is obtained directly.

[0041] Preparation of water-based epoxy resin ele...

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Abstract

The invention discloses a graphene / nano ferrite based water electromagnetic shielding paint and a preparation method thereof. Ferrite nanoparticles are loaded on the surface of graphene to prepare a graphene / ferrite nanocomposite with the electrical conductivity of the graphene and the good magnetic property of the nano ferrite, and then the nanocomposite is combined with a water film-forming resin and other auxiliaries to prepare the green and environment-friendly water electromagnetic shielding paint. The preparation method has the characteristics of being simple to operate, high in practicability, free of hazardous substance, capable of making electromagnetic shielding paints suitable for different frequencies and occasions, good in shielding effect, and the like; the prepared graphene / nano ferrite based water electromagnetic shielding paint has excellent electromagnetic shielding performance, and therefore has good application prospect in the field of electromagnetic shielding paints.

Description

technical field [0001] The invention belongs to the field of electromagnetic wave shielding coatings, in particular to graphene / nanometer ferrite-based water-based electromagnetic shielding coatings and a preparation method thereof. Background technique [0002] The rapid development of electronics, electrical, communication and information industries has brought great convenience to people's life and work, and at the same time, electromagnetic radiation pollution has become a new environmental pollution after wastewater pollution, waste gas pollution, solid waste pollution, and noise pollution. , not only cause serious interference to people's daily communication equipment, computers and other electronic systems, pose a serious threat to information security, but also cause immeasurable damage to human health. The absorbing material is a kind of functional material that can absorb and attenuate the electromagnetic waves projected on its surface, and convert them into heat e...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D163/00C09D133/04C09D5/24C09D5/32C09D7/12
Inventor 赵芸王燕枫矫庆泽黎汉生吴芹
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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