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Mofs-derived porous carbon-coated sheet carbonyl iron composite absorbing material and preparation method

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, improved electromagnetic wave loss capability, and simple preparation process

Active Publication Date: 2022-07-29
ROCKET FORCE UNIV OF ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 sheet carbonyl iron composite absorbing material and preparation method
  • Mofs-derived porous carbon-coated sheet carbonyl iron composite absorbing material and preparation method
  • Mofs-derived porous carbon-coated sheet carbonyl iron composite absorbing material and preparation method

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Embodiment 1

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

[0039] Step 1. Preparation of flaky iron carbonyl.

[0040] Step 1.1, select spherical carbonyl iron;

[0041] In step 1.2, spherical carbonyl iron is ball-milled by a mechanical ball milling method to prepare flake carbonyl iron.

[0042] Specifically, using spherical carbonyl iron as a raw material, a mechanical ball milling method is used to prepare flake carbonyl iron.

[0043] Step 2, adding flaky carbonyl iron, polyvinylpyrrolidone, and salt material to methanol and / or ethanol to prepare suspension A, where the salt material is Co salt and / or Zn salt.

[0044] Spec...

Embodiment 2

[0067] This embodiment provides, on the basis of the first embodiment, a preparation method of a sheet-like carbonyl iron composite wave absorbing material coated with MOFs-derived porous carbon, and the preparation method includes:

[0068] Step 1. Preparation of flaky iron carbonyl.

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

[0070] Step 2. Combine 2 g of the flaky carbonyl iron prepared in step 1, 1 g of polyvinylpyrrolidone (K30), 7.5 mmol of Co(NO 3 ) 2 ·6H 2 O was added to 80 mL of methanol, followed by sonication...

Embodiment 3

[0074] This embodiment provides another specific preparation method of the MOFs-derived porous carbon-coated sheet carbonyl iron composite wave absorbing material on the basis of the first embodiment, and the preparation method includes:

[0075] Step 1. Preparation of flaky iron carbonyl.

[0076] Specifically, 200g stainless steel balls with a diameter of 6mm and 8g carbonyl iron powder were added to a 100mL stainless steel ball mill at a ball-to-material ratio of 25:1, and then 0.01g of surfactant calcium stearate and 40mL of acetone, a ball milling medium, were added respectively. High-energy ball milling at a fixed speed of 375r / min on a planetary ball mill for 11h, after separation, washing and drying, flake carbonyl iron is obtained.

[0077] Step 2. Combine 2 g of the flaky carbonyl iron prepared in step 1, 1 g of polyvinylpyrrolidone (K30), 5.62 mmol of 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 sonication an...

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Abstract

The invention relates to a sheet-like carbonyl iron composite wave absorbing material coated with MOFs-derived porous carbon and a preparation method. The method comprises: preparing sheet-like carbonyl iron; adding the sheet-like carbonyl iron, polyvinylpyrrolidone and salt into methanol and To prepare suspension A in / or ethanol, the salt material is Co salt and / or Zn salt; dissolve dimethylimidazole in methanol to obtain solution B; add the solution B to the suspension under stirring conditions turbid liquid A to prepare a precursor; in an inert atmosphere, the precursor is calcined to obtain a sheet-like carbonyl iron composite wave absorbing material coated with MOFs-derived porous carbon. The invention combines sheet carbonyl iron and MOFs-derived lightweight porous carbon material, reduces the filling ratio of the composite material, realizes the regulation of the electromagnetic wave absorption performance of the composite material by controlling the components and properties of the porous carbon coating layer, and improves the electromagnetic wave loss. capacity, simple preparation process and low cost, and is suitable for large-scale mass production.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbing materials, and relates to a sheet-like carbonyl iron composite wave absorbing material coated with MOFs-derived porous carbon and a preparation method. Background technique [0002] With the rapid development of electronic information technology, the increasingly powerful target detection and tracking capabilities have made weapon systems a serious threat to detection, and electromagnetic wave radiation pollution has also become an important "killer" for human health. Therefore, the development of lightweight, broadband electromagnetic waves with excellent performance Absorbent material is important. [0003] Lightweight is an important indicator to measure the comprehensive performance of absorbing materials. Carbonyl iron has good absorbing properties, but its high density and high filling ratio make it difficult to meet the requirements of lightweight design of absorbing...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 ROCKET FORCE UNIV OF ENG
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