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Preparation method and application of composite wave absorbing material of graphene and zeolite

A composite absorbing material, graphene technology, applied in chemical instruments and methods, other chemical processes, etc., can solve the problems of difficult to achieve large-scale production, poor absorbing performance, high density, etc., to achieve low material cost, coverage The effect of a wide range and simple experimental equipment

Active Publication Date: 2016-09-21
重庆深盟新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of high density of traditional wave-absorbing materials and solve the problems of poor wave-absorbing performance, high cost, and difficulty in large-scale production, the invention provides a preparation method and application of a composite wave-absorbing material composed of graphene and zeolite

Method used

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  • Preparation method and application of composite wave absorbing material of graphene and zeolite
  • Preparation method and application of composite wave absorbing material of graphene and zeolite
  • Preparation method and application of composite wave absorbing material of graphene and zeolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] (1) Graphene is prepared by chemical redox method.

[0057] Ⅰ. Dissolve graphite oxide in an ethanol solution with a volume ratio of ethanol and water of 1:1, and sonicate for 10-15 minutes to obtain a 1 mg / ml graphite oxide solution.

[0058] II. Transfer 80ml of the above solution into a reaction kettle, add 10mg of sodium borohydride, place the reaction kettle in an oven at 120°C for 4 hours, and cool down to room temperature naturally.

[0059] III. The product was taken out from the reaction kettle, washed three times with deionized water, and then dried in an oven at 45°C to obtain chemically reduced graphene oxide.

[0060] (2) Preparation of graphene graphene and zeolite composite absorbing material.

[0061] a. Dissolve 0.1807g of NaOH solution in 40ml of deionized water, divide it into NaOH solution, divide it into two parts, add 2.0625g of sodium metaaluminate to one of the NaOH solutions, stir until the solution is clear, then add 0.0090g of step (1 ) in G...

Embodiment 2

[0070] (1) Graphene was prepared by microwave redox method.

[0071] 1. Dissolve graphite oxide in an ethanol solution with a volume ratio of ethanol and water of 1:1, and sonicate for 10-15 minutes to obtain a 1 mg / ml graphite oxide solution.

[0072] II. Divide 80mL of the above solution into 4 digestion tubes, put it into a microwave digestion apparatus, raise the temperature to 120°C under the condition of 800W, and react for 10min to obtain the reduced graphene oxide solution after microwave treatment.

[0073] (2) Preparation of graphene graphene and zeolite composite absorbing material.

[0074] a. Dissolve 0.1807g of NaOH solution in 40ml of deionized water, divide it into NaOH solution, divide it into two parts, add 2.0625g of sodium metaaluminate to one of the NaOH solutions, stir until the solution is clear, then add 0.0090g of step (1 ) using the graphene prepared by the microwave redox method, ultrasonically dispersed for 8min to obtain solution A;

[0075] b. A...

Embodiment 3

[0083] (1) Graphene is prepared by thermal expansion method.

[0084] Grind graphite oxide into powder, put it into a tube furnace, seal the heating nozzle, gradually raise the temperature to 200°C, and keep it for 4 hours, then cool down to obtain thermally expandable graphene.

[0085] (2) Preparation of graphene graphene and zeolite composite absorbing material.

[0086] a. Dissolve 0.1807g of NaOH solution in 40ml of deionized water, divide it into NaOH solution, divide it into two parts, add 2.0625g of sodium metaaluminate to one of the NaOH solutions, stir until the solution is clear, then add 0.0090g of step (1 ) in Graphene prepared by thermal expansion method, ultrasonic dispersion 8min, to obtain solution A;

[0087] b. Add 3.87g sodium metasilicate to another part of NaOH solution, stir until the solution is clear, then add 0.0090g of graphene prepared by thermal expansion method in step (1), and ultrasonically disperse for 8min to obtain solution B;

[0088] c. A...

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Abstract

The invention provides a preparation method and application of a composite wave absorbing material of graphene and zeolite. The preparation method comprises the following steps: a, taking sodium hydroxide, dissolving to form a NaOH solution, dividing the NaOH solution into two parts, adding sodium metaaluminate in one part of the NaOH solution, stirring until the solution is clear, adding the graphene, and dispersing ultrasonically to obtain a solution A; b, adding sodium metasilicate in the other part of NaOH solution, stirring until the solution is clear, adding the graphene, and dispersing ultrasonically to obtain a solution B; c, adding the solution B in the solution A, stirring evenly, sealing and ageing, placing in a freezer dryer and carrying out freeze-drying to obtain the composite wave absorbing material of the graphene and the zeolite, wherein the molar ratio of the sodium metasilicate, the sodium metaaluminate and the sodium hydroxide is 1.24:1:3.66, and the mass ratio of the total graphene added in the step a and the step b to the sodium hydroxide is 0.05-2.0:10. The reflection loss of the material prepared by the invention can reach -53 dB, the frequency coverage area is wide, the wave absorbing property is good, the density is low, the content of the graphene is small, the cost of raw materials is low, and industrial production is convenient to realize.

Description

technical field [0001] The invention relates to a wave-absorbing material and a preparation method thereof, in particular to a preparation method and application of a composite wave-absorbing material of graphene and zeolite. Background technique [0002] With the development of science and technology, various high-power radars, communication machines, microwave heating and other equipment have brought a lot of convenience to production and life. At the same time, electromagnetic radiation or leakage also poses a great threat to human health. Scientific research shows that excessive electromagnetic radiation will not only cause "electromagnetic wave allergy", but also cause neurasthenia, loss of appetite, palpitations, chest tightness, and dizziness. dizziness and other symptoms, and even lead to brain tumors. The absorbing material has a high absorption rate for electromagnetic waves in a wide frequency band, which can absorb part of the electromagnetic radiation and reduc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K3/00
CPCC09K3/00
Inventor 周忠福王会利张海洋沈璐高紧紧王清露
Owner 重庆深盟新材料科技有限公司
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