Application of Cu-HHTP coated PPy as wave-absorbing material

Abstract

The invention discloses an application of Cu-HHTP coated PPy as a wave absorbing material, the Cu-HHTP coated PPy is composed of Cu-HHTP and polypyrrole, the polypyrrole is in a nanotube shape, and the Cu-HHTP grows on the surface of the polypyrrole nanotube. The fabric has good electromagnetic wave absorption performance. Cu-HHTP coated PPy and paraffin are uniformly mixed according to the mass ratio of 3: 7, and when the matching thickness is 2.4 mm, the absorption frequency band width with the reflection loss lower than-10 dB can reach 6.68 GHz.

Description

Technical Field

[0001] The invention belongs to the field of preparation of electromagnetic wave absorbing materials, and particularly relates to use of a Cu-HHTP@PPy absorbing material. Background Art

[0002] In today's era, science and technology are developing rapidly, and the social landscape is changing with each passing day. At the same time, the problem of electromagnetic radiation pollution is becoming increasingly prominent. While the complex electromagnetic environment brings unprecedented convenience to life, it also has serious negative impacts on human health, the natural environment, and information security. Electromagnetic wave absorbing materials (absorbent materials) can dissipate electromagnetic waves by absorbing incident waves and converting them into internal energy or other forms of energy. Their research and development and application are becoming increasingly important.

[0003] Metal-organic frameworks (MOFs) are a promising class of porous crystalline materials, consisting of metal centers bridged to organic ligands via coordination bonds, with features such as adjustable porosity, ultrahigh surface area, and light weight. In recent years, MOFs have shown significant advantages in the field of electromagnetic functional materials, especially absorbing materials. However, it must be emphasized that current research is still limited by many factors. In terms of materials and methods, the growth mechanism of MOF-derived carbon-based materials has not been fully understood, and the precise regulation of their composition remains a major problem. Moreover, MOF-derived carbon-based materials have low chemical stability and are difficult to mass produce.

[0004] Studies have shown that it is feasible to use the original non-carbonized metal organic framework for electromagnetic wave absorption. Cu-HHTP (HHTP = 2,3,6,7,10,11-hexahydroxytriphenyl hydrate) has the advantages of low density and high porosity, but its low conductivity limits its application in the direction of wave absorption. Summary of the invention

[0005] In order to overcome the problems of narrow absorption bandwidth and weak reflection loss of Cu-HHTP, the present invention provides an application of a Cu-HHTP@PPy (polypyrrole) composite material in electromagnetic wave absorption.

[0006] The technical solution to achieve the purpose of the present invention is: a use of Cu-HHTP@PPy as an absorbing material, Cu-HHTP@PPy is composed of Cu-HHTP and polypyrrole, the polypyrrole is in the form of nanotubes, and the Cu-HHTP grows on the surface of the polypyrrole nanotubes.

[0007] Preferably, the Cu-HHTP@PPy is mixed evenly with paraffin and then pressed into a ring-shaped sample of a certain thickness as an absorbing material.

[0008] Specifically, the mass content of Cu-HHTP@PPy in the absorbing material is 20-40%, preferably 30%.

[0009] Specifically, the thickness is 2~3mm.

[0010] The Cu-HHTP@PPy absorbing material is prepared by the following steps:

[0011] Step 1: Add ferric chloride to the methyl orange solution and stir for 10 minutes;

[0012] Step 2: Add pyrrole to the solution obtained in step 1, stir to react, wash the obtained product, and vacuum dry to obtain a polypyrrole tube;

[0013] Step 3: adding the polypyrrole tube to water and dispersing it by ultrasonic, adding copper acetate hydrate to the obtained dispersion and performing ultrasonic homogenization;

[0014] Step 4: Add 2,3,6,7,10,11-hexahydroxytriphenyl hydrate to the solution obtained in step 3, homogenize with ultrasound, and heat at 85±5°C for 12 hours;

[0015] Step 5: After cooling to room temperature, wash and dry.

[0016] Preferably, in step 1, the concentration of methyl orange solution is 0.83 mg / ml.

[0017] Preferably, in step 2, the molar ratio of pyrrole to ferric chloride is 1:1.

[0018] Preferably, in step 2, the reaction is stirred for 24 h.

[0019] Preferably, in step 3, the mass ratio of the polypyrrole tube to the copper acetate hydrate is 5:8.

[0020] Preferably, in step 4, the mass ratio of 2,3,6,7,10,11-hexahydroxytriphenyl hydrate to copper acetate hydrate is 7:8.

[0021] Compared with the prior art, the advantages of the present invention are:

[0022] (1) Cu-HHTP@PPy is used as a microwave absorbing material for the first time. It consists of Cu-HHTP and polypyrrole. The polypyrrole is in the form of nanotubes, and the Cu-HHTP grows on the surface of the polypyrrole tube.

[0023] (2) When mixed evenly with paraffin in a mass ratio of 3:7, when the matching thickness is 2.4 mm, the absorption bandwidth with reflection loss below -10 dB can reach 6.68 GHz. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 a is the scanning electron microscope image of PPy, and b is the scanning electron microscope image of Cu-HHTP@PPy.

[0025] Figure 2 This is the X-ray diffraction pattern of Cu-HHTP@PPy.

[0026] Figure 3 This is the wave absorbing performance of Example 1.

[0027] Figure 4 This is the wave absorbing performance of Example 2.

[0028] Figure 5 This is the wave absorbing performance of Example 3.

[0029] Figure 6 This is the wave absorbing performance of Example 4.

[0030] Figure 7 This is the wave absorbing performance of Example 5. DETAILED DESCRIPTION

[0031] The present invention will now be further described with reference to the embodiments and the accompanying drawings:

[0032] Embodiment 1:

[0033] Dissolve 50 mg of methyl orange in 60 ml of deionized water and stir for 10 minutes. The concentration of the obtained methyl orange solution is 0.83 mg / ml. Add 245 mg of ferric chloride to the obtained methyl orange solution and stir for 10 minutes. Add 106 μl of pyrrole to the obtained dispersion. Wash the obtained product with deionized water and anhydrous ethanol, and dry it at 60 °C in vacuum for 4 hours to obtain polypyrrole tubes. The scanning electron microscope shows that Figure 1 As shown in a. 10 mg of polypyrrole was added to 8 ml of deionized water and ultrasonicated for 10 minutes. 16 mg of copper acetate hydrate was added to the resulting dispersion and ultrasonicated for 10 minutes. 14 mg of 2,3,6,7,10,11-hexahydroxytriphenyl hydrate was added to the resulting dispersion and ultrasonicated for 10 minutes, and heated at 85 °C for 12 hours. After cooling to room temperature, the product was washed with deionized water and ethanol, and dried at 60 °C for 4 hours to obtain Cu-HHTP@PPy, whose scanning electron microscope image is shown in Figure 1 Its X-ray diffraction pattern is shown in b. Figure 2 shown.

[0034] Cu-HHTP@PPy was mixed with paraffin wax, with the paraffin wax accounting for 70% of the total mass, and pressed into a ring mold (2.0 mm in height, 7.0 mm in outer diameter, and 3.0 mm in inner diameter) to make sample 1. Its microwave absorption performance is shown in Figure 1. Figure 3As shown in the figure. Sample 1 has an electromagnetic wave absorption bandwidth of less than -10 dB at 4.60 GHz at a thickness of 2.0 mm, and a maximum reflection loss of -41.56 dB; an electromagnetic wave absorption bandwidth of less than -10 dB at a thickness of 2.4 mm can reach 6.68 GHz; and a maximum reflection loss of -49.56 dB at 2.8 mm (almost 99.999% of electromagnetic waves can be absorbed). In addition, as the thickness of the sample increases, the maximum reflection loss moves to a lower frequency.

[0035] Example 2: The "paraffin accounts for 70% of the total mass" in Example 1 is replaced by "paraffin accounts for 80% of the total mass", and the other preparation and wave absorption performance test processes are the same as in Example 1. The wave absorption performance is as follows: Figure 4 shown.

[0036] Example 3: The "paraffin accounts for 70% of the total mass" in Example 1 is replaced by "paraffin accounts for 60% of the total mass", and the other preparation and wave absorption performance test processes are the same as in Example 1. The wave absorption performance is as follows: Figure 5 shown.

[0037] Example 4: Dissolve 50 mg of methyl orange in 60 ml of deionized water and stir for 10 minutes. The concentration of the obtained methyl orange solution is 0.83 mg / ml. Add 245 mg of ferric chloride to the obtained methyl orange solution and stir for 10 minutes. Add 106 μl of pyrrole to the obtained solution and stir for 24 hours. Wash the obtained product with deionized water and anhydrous ethanol, and dry it at 60 °C in a vacuum for 4 hours to obtain a polypyrrole tube. Mix the polypyrrole tube with paraffin wax, with the paraffin wax accounting for 70% of the total mass, and press it into a ring mold (2.0 mm high, 7.0 mm outer diameter, 3.0 mm inner diameter) to make sample 2. Its wave absorbing performance is as shown in the following figure. Figure 6 The electromagnetic wave absorption bandwidth of the sample below -10 dB at a thickness of 2.0 mm is 0 GHz.

[0038] Example 5: Add 16 mg of copper acetate hydrate to 8 ml of deionized water and ultrasonicate for 10 minutes. Add 14 mg of 2,3,6,7,10,11-hexahydroxytriphenyl hydrate to the resulting solution, ultrasonicate for 10 minutes, and heat at 85°C for 12 hours. After cooling to room temperature, wash the resulting product with deionized water and anhydrous ethanol, and dry it at 60°C in a vacuum for 4 hours to obtain Cu-HHTP. Mix Cu-HHTP and paraffin wax evenly, with the paraffin accounting for 70% of the total mass, and press into a ring mold (2.0 mm high, 7.0 mm outer diameter, 3.0 mm inner diameter) to make sample 3, whose wave absorbing properties are as follows. Figure 7 As shown in the figure, the effective absorption bandwidth of electromagnetic waves below -10 dB for this sample with a thickness of 2.0 mm is 0 GHz.

Claims

1. A use of Cu-HHTP@PPy as a wave absorbing material, characterized in that: Cu-HHTP@PPy consists of Cu-HHTP and polypyrrole. The polypyrrole is in the shape of nanotubes. The Cu-HHTP grows on the surface of the polypyrrole nanotubes.

2. The use according to claim 1, characterized in that Cu-HHTP@PPy was mixed evenly with paraffin and pressed into a ring-shaped sample of a certain thickness as an absorbing material.

3. The use according to claim 1, characterized in that The mass content of Cu-HHTP@PPy in the absorbing material is 20-40%, preferably 30%.

4. The use according to claim 1, characterized in that The thickness is 2~3mm.

5. The use according to claim 1, characterized in that Cu-HHTP@PPy is produced by the following steps: Step 1: Add ferric chloride to the methyl orange solution and stir for 10 minutes; Step 2: Add pyrrole to the solution obtained in step 1, stir to react, wash the obtained product, and vacuum dry to obtain a polypyrrole tube; Step 3: adding the polypyrrole tube to water and dispersing it by ultrasonic, adding copper acetate hydrate to the obtained dispersion and performing ultrasonic homogenization; Step 4: Add 2,3,6,7,10,11-hexahydroxytriphenyl hydrate to the solution obtained in step 3, homogenize with ultrasound, and heat at 85 ± 5 °C for 12 hours; Step 5: After cooling to room temperature, wash and dry.

6. The use according to claim 5, characterized in that In step 1, the concentration of methyl orange solution is 0.83 mg / ml.

7. The use according to claim 5, characterized in that In step 2, the molar ratio of pyrrole to ferric chloride is 1:

1.

8. The use according to claim 5, characterized in that In step 2, the reaction was stirred for 24 h.

9. The use according to claim 5, characterized in that In step 3, the mass ratio of the polypyrrole tube to the copper acetate hydrate is 5:

8.

10. The use according to claim 5, characterized in that In step 4, the mass ratio of 2,3,6,7,10,11-hexahydroxytriphenyl hydrate to cupric acetate hydrate is 7:8.

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