Graphene-silicon electromagnetic shielding filler and electromagnetic shielding coating

An electromagnetic shielding coating, electromagnetic shielding technology, applied in the direction of conductive coatings, anti-corrosion coatings, coatings, etc., can solve the problems of adverse effects on graphene's electrical conductivity, poor conductivity, etc., to avoid adverse effects, anti-oxidation and corrosion resistance. Effect

Active Publication Date: 2018-06-05
惠州市栢诗新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, basalt itself has poor electrical conductivity, which has an adverse effect on the excellent electrical conductivity of graphene.

Method used

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  • Graphene-silicon electromagnetic shielding filler and electromagnetic shielding coating
  • Graphene-silicon electromagnetic shielding filler and electromagnetic shielding coating
  • Graphene-silicon electromagnetic shielding filler and electromagnetic shielding coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of graphene-silicon electromagnetic shielding filler of the present embodiment, concrete preparation steps are as follows:

[0029] (1) 10g tetraethyl orthosilicate is joined in 100g ethanol mass fraction and be 90% ethanol aqueous solution, then add 0.5g ammonia water as catalyst, under the temperature of 40 DEG C, ultrasonic stirring reaction obtains nano-silica sol;

[0030] (2) Add 1g graphene to the nano-silica sol gained in step (1), ultrasonically stir and disperse evenly to obtain a mixed solution, freeze-dry to obtain a nano-silica-graphene composite;

[0031] (3) Mix the nano-silica-graphene composite obtained in step (2) with magnesium powder and place it in a carbonization furnace, raise the temperature to 700°C for high-temperature thermal reduction reaction for 4 hours, and wash the product with hydrochloric acid and deionized water in turn Vacuum drying at 80° C. to obtain graphene-silicon electromagnetic shielding filler.

Embodiment 2

[0033] A kind of preparation method of graphene-silicon electromagnetic shielding filler of the present embodiment, concrete preparation steps are as follows:

[0034] (1) 10g tetraethyl orthosilicate is joined in 50g ethanol mass fraction and be 75% ethanol aqueous solution, then add 0.5g ammonia water as catalyst, under 50 ℃ of temperature, ultrasonic stirring reaction obtains nano-silica sol;

[0035] (2) Add 3g graphene to the nano-silica sol gained in step (1), ultrasonically stir and disperse evenly, obtain a mixed solution, and freeze-dry to obtain a nano-silica-graphene composite;

[0036] (3) Mix the nano-silica-graphene composite obtained in step (2) with magnesium powder and place it in a carbonization furnace, raise the temperature to 600°C for high-temperature thermal reduction reaction for 6 hours, and wash the product with hydrochloric acid and deionized water in turn Vacuum drying at 80° C. to obtain graphene-silicon electromagnetic shielding filler.

Embodiment 3

[0038] A kind of preparation method of graphene-silicon electromagnetic shielding filler of the present embodiment, concrete preparation steps are as follows:

[0039] (1) 10g ethyl orthosilicate is joined in 200g ethanol mass fraction and be 95% ethanol aqueous solution, then add 2.0g ammonia water as catalyst, under 50 ℃ of temperature, ultrasonic stirring reaction obtains nano-silica sol;

[0040] (2) Add 0.5g graphene to the nano-silica sol gained in step (1), ultrasonically stir and disperse evenly to obtain a mixed solution, freeze-dry to obtain a nano-silica-graphene composite;

[0041] (3) Mix the nano-silica-graphene composite obtained in step (2) with magnesium powder and place it in a carbonization furnace, raise the temperature to 800°C for high-temperature thermal reduction reaction for 2 hours, and wash the product with hydrochloric acid and deionized water in turn Vacuum drying at 100°C to obtain a graphene-silicon electromagnetic shielding filler.

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Abstract

The invention belongs to the field of electromagnetic shielding materials and discloses graphene-silicon electromagnetic shielding filler and electromagnetic shielding coating. The graphene-silicon electromagnetic shielding filler is prepared by the following steps: adding tetraethyl orthosilicate into an ethanol water solution; then adding ammonia water as a catalyst; reacting at the temperatureof 30 to 60 DEG C to obtain nano silicon dioxide sol; then adding graphene and ultrasonically stirring and uniformly dispersing to obtain a mixed solution; drying the mixed solution to obtain a nano silicon dioxide-graphene compound; uniformly mixing the obtained nano silicon dioxide-graphene compound with magnesium powder; raising the temperature to be 500 to 1000 DEG C and carrying out high-temperature thermal reduction reaction; washing and drying to obtain the graphene-silicon electromagnetic shielding filler. According to the graphene-silicon electromagnetic shielding filler disclosed bythe invention, the graphene and semiconductor silicon are doped and compounded, so that the electrical conductivity of a compound is remarkably improved and the electromagnetic shielding performance of the compound is further enhanced; the adverse effect, cased by a composite matrix in an existing composite material, on the electrical conductivity of the graphene is avoided.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding materials, in particular to a graphene-silicon electromagnetic shielding filler and an electromagnetic shielding paint. Background technique [0002] Electromagnetic shielding coatings are electrical conductivity in 10 -10 s cm -1 Above, the paint that has the ability to conduct electric current and dispel the accumulated electrostatic charge. The coating generally contains a matrix resin, solvent and conductive filler, which can form an electromagnetic shielding coating on the substrate. On the one hand, the electromagnetic shielding coating can prevent the interference of electromagnetic wave radiation in the environment on the signal of electronic products, so that the signal of electronic products is fidelity and stable; on the other hand, it can prevent the electromagnetic wave radiation pollution of electronic products to the environment, and keep the signal of electronic products ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D133/04C09D5/24C09D5/08C09D7/61
CPCC08K3/04C08K3/36C08K2201/011C09D5/08C09D5/24C09D133/04
Inventor 李泳
Owner 惠州市栢诗新材料有限公司
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