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MOFs-derived porous carbon-coated flaky carbonyl iron composite wave-absorbing material and preparation method thereof

A composite wave absorbing material, carbonyl iron technology, applied in the preparation/purification of carbon, carbonyl iron, electrical components, etc., to achieve the effects of low cost, simple preparation process, and reduced filling ratio

Active Publication Date: 2021-03-19
中国人民解放军火箭军工程大学
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few studies on the preparation of carbonyl iron coated with porous carbon materials, especially the research on sheet carbonyl iron composites coated with porous carbon derived from bimetallic MOFs has not been reported yet.

Method used

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  • MOFs-derived porous carbon-coated flaky carbonyl iron composite wave-absorbing material and preparation method thereof
  • MOFs-derived porous carbon-coated flaky carbonyl iron composite wave-absorbing material and preparation method thereof
  • MOFs-derived porous carbon-coated flaky carbonyl iron composite wave-absorbing material and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0038] See figure 1 , figure 1 The flow chart of the preparation method of a MOFs-derived porous carbon-coated sheet carbonyl iron composite absorbing material provided by the embodiment of the present invention. The invention provides a method for preparing a sheet-shaped carbonyl iron composite wave-absorbing material coated with MOFs derived porous carbon. The preparation method comprises the following steps:

[0039] Step 1, preparing flake carbonyl iron.

[0040] Step 1.1, select spherical carbonyl iron;

[0041] Step 1.2, using a mechanical ball milling method to ball mill the spherical carbonyl iron to prepare flake carbonyl iron.

[0042] Specifically, spherical carbonyl iron was used as raw material, and flake carbonyl iron was prepared by mechanical ball milling.

[0043] Step 2. Add flake carbonyl iron, polyvinylpyrrolidone, and salt into methanol and / or ethanol to prepare suspension A. The salt is Co salt and / or Zn salt.

[0044] Specifically, 1-5 g of flake c...

Embodiment 2

[0067] On the basis of Example 1, this example provides a method for preparing a sheet-shaped carbonyl iron composite absorbing material coated with MOFs-derived porous carbon. The preparation method includes:

[0068] Step 1, preparation of flake carbonyl iron.

[0069] Specifically, 200 g of stainless steel balls with a diameter of 6 mm and 8 g of carbonyl iron powder were added to a 100 mL stainless steel ball milling tank at a ball-to-material ratio of 25:1, and then 0.01 g of surfactant calcium stearate and 40 mL of ball milling medium acetone were added respectively. Then, it was milled on a planetary ball mill with a fixed rotational speed of 375r / min for 11 hours, and after separation, washing and drying, flake carbonyl iron was obtained.

[0070] Step 2, the flake carbonyl iron prepared in 2g step 1, 1g polyvinylpyrrolidone (K30), 7.5mmol Co(NO 3 ) 2 ·6H 2 O was added to 80 mL of methanol, followed by ultrasonic and mechanical stirring for 20 min to obtain suspensi...

Embodiment 3

[0074] On the basis of Example 1, this example provides another method for preparing MOFs-derived porous carbon-coated sheet-shaped carbonyl iron composite wave-absorbing materials. The preparation method includes:

[0075] Step 1, preparation of flake carbonyl iron.

[0076] Specifically, add 200g of stainless steel balls with a diameter of 6mm and 8g of carbonyl iron powder into a 100mL stainless steel ball milling tank according to the ball-to-material ratio of 25:1, then add 0.01g of surfactant calcium stearate and 40mL of ball milling medium acetone, and then The high-energy ball milled on a planetary ball mill with a fixed speed of 375r / min for 11 hours, after separation, washing and drying, flake iron carbonyl was obtained.

[0077] Step 2, the flake carbonyl iron prepared in 2g step 1, 1g polyvinylpyrrolidone (K30), 5.62mmol Co(NO 3 ) 2 ·6H 2 O and 1.88mmol Zn(NO 3 ) 2 ·6H 2 O was added to 80 mL of methanol, followed by ultrasonic and mechanical stirring for 20 m...

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Abstract

The invention relates to an MOFs-derived porous carbon-coated flaky carbonyl iron composite wave-absorbing material and a preparation method thereof. The method comprises the following steps: preparing flaky carbonyl iron; adding the flaky carbonyl iron, polyvinylpyrrolidone and a salt material into methanol and / or ethanol to prepare turbid liquid A, wherein the salt material is Co salt and / or Znsalt; dissolving dimethylimidazole in methanol to obtain a solution B; adding the solution B into the turbid liquid A under a stirring condition to prepare a precursor; and calcining the precursor inan inert atmosphere to obtain the MOFs-derived porous carbon-coated flaky carbonyl iron composite wave-absorbing material. The flaky carbonyl iron and an MOFs-derived light porous carbon material arecompounded, the filling proportion of the composite material is reduced, regulation and control of the electromagnetic wave absorption performance of the composite material are achieved by controllingthe components and performance of the porous carbon coating layer, the electromagnetic wave loss capacity is improved, the preparation process is simple, the cost is low, and the composite material is suitable for large-scale batch production.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, and relates to a sheet-shaped carbonyl iron composite wave-absorbing material coated with MOFs-derived porous carbon and a preparation method thereof. Background technique [0002] With the rapid development of electronic information technology, the increasingly powerful target detection and tracking capabilities have made weapon systems severely threatened by detection, and electromagnetic wave radiation pollution has also become an important "killer" of human health. Therefore, it is necessary to develop lightweight, broadband electromagnetic waves with excellent performance Absorbent materials are of great importance. [0003] Lightness is an important indicator to measure the comprehensive performance of absorbing materials. Carbonyl iron has good absorbing properties, but its density is relatively high, and its filling ratio is high, so it is difficult to me...

Claims

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Application Information

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IPC IPC(8): H05K9/00C01B32/05C01G49/16
CPCH05K9/0081C01G49/16C01B32/05
Inventor 汪刘应刘顾葛超群王龙许可俊王伟超
Owner 中国人民解放军火箭军工程大学
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