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A kind of preparation method of magnetic metal sepiolite composite powder or fiber

A sepiolite fiber and magnetic metal technology, applied in metal processing equipment, coating, transportation and packaging, etc., can solve the problems of insignificant absorption effect, high density, single loss mechanism, etc., and achieve easy magnetic loss matching characteristics, The preparation method is simple and the effect of high loading capacity

Active Publication Date: 2018-07-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carbonyl iron, as a typical magnetic loss absorbing material, has high magnetic permeability and thermal stability, and has a certain absorption potential in the S-band (2-4 GHz), but its high density and single loss mechanism make it increasingly difficult to Meet today's growing application requirements
Li Ze et al [Li Ze, Xu Baocai, Wang Jianjiang et al, BaTiO 3 Preparation of coated carbonyl iron absorbing agent and research on its absorbing performance, Journal of Synthetic Crystals, 2016, 45(9): 2240-2245] Adjusting the dielectric constant of the material and improving the absorbing properties of the material by coating the carbonyl iron surface performance, but the absorption frequency band is narrow, and the absorption effect is not obvious in the X-band (8-12GHz)
Li Xiangcheng et al [Li Xiangcheng, Gong Rongzhou, Lu Pei et al., Study on Fiber Structure Control and Electromagnetic Mechanism of Carbonyl Iron-Nickel Fiber, Rare Earth Metal Materials Science and Engineering, 2007,36(23):222~224] Prepared by thermal decomposition of carbonyl iron compound Carbonyl iron and carbonyl iron-nickel fibers are used, and the reflectivity loss is lower than -5dB in the range of 8-12GHz, but the loss is low enough to be put into application

Method used

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  • A kind of preparation method of magnetic metal sepiolite composite powder or fiber
  • A kind of preparation method of magnetic metal sepiolite composite powder or fiber
  • A kind of preparation method of magnetic metal sepiolite composite powder or fiber

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Effect test

Embodiment 1

[0043] After burning the sepiolite powder in an oven at 120° C. for 12 hours, cooling, grinding, and passing through a 200-mesh sieve, the pretreated sepiolite powder was obtained. Using xylene as an organic solvent, a metal-organic solution system is prepared with carbonyl iron in a solution system with a mass percentage of 50%, and added to a 20L reactor with a filling capacity of 50%, and the pretreated Sepiolite powder. Close the reactor, feed nitrogen, and remove the oxygen in the reactor. Set up a 3-stage heating program: (1) from room temperature to 100°C in 120 minutes, (2) from 100°C to 120°C in 540 minutes, (3) from 120°C to 135°C in 240 minutes. Then the temperature is lowered to room temperature, and the material is discharged. The obtained material is washed with absolute ethanol, filtered, dried, ground, and sieved to obtain a reaction product, which is a sepiolite fiber composite powder loaded with magnetic metal iron.

[0044] It can be seen from the attached...

Embodiment 2

[0047] After burning the sepiolite powder in an oven at 120° C. for 12 hours, cooling, grinding, and passing through a 200-mesh sieve, the pretreated sepiolite powder was obtained. Xylene is an organic solvent, carbonyl iron and carbonyl cobalt are mixed at a mass percentage of 1:1, and a mixture of pentacarbonyl iron and octacarbonyl dicobalt is configured in a solution system with a mass percentage of 50% to prepare a metal-organic solution system and add it to a 20L reaction In the kettle, the filling amount is 50%, and the pretreated sepiolite powder is added with a liquid-solid ratio of 4. Close the reactor, feed nitrogen, and remove the oxygen in the reactor. Set up a 3-stage heating program: (1) from room temperature to 100°C in 120 minutes, (2) from 100°C to 120°C in 540 minutes, (3) from 120°C to 135°C in 240 minutes. Then the temperature is lowered to room temperature, and the material is discharged. The obtained material is washed with absolute ethanol, filtered, d...

Embodiment 3

[0049] Prepare a 95% ethanol solution of silane coupling agent (KH550) with a concentration of 0.5mmol / L, add sepiolite fibers to the 95% ethanol solution of silane coupling agent according to the liquid-solid ratio of 3, stir at 20°C for 60min, then wash and filter , dried at 120°C for 2 hours, cooled, ground, and sieved to obtain pretreated sepiolite fibers. Quinoline is an organic solvent, and nickel tetracarbonyl and dimanganese decacarbonyl are mixed at a mass percentage of 2.6:1, and the mixture of nickel tetracarbonyl and dimanganese decacarbonyl is configured in a solution system with a mass percentage of 30% to form a metal-organic solution system, and is added to In the 20L reactor, the filling amount is 50%, and the pretreated sepiolite powder is added at a liquid-solid ratio of 8. Close the reactor, feed nitrogen, and remove the oxygen in the reactor. Set up a 3-stage heating program: (1) from room temperature to 150°C in 240 minutes, (2) from 150°C to 200°C in 48...

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Abstract

The invention discloses a method for preparing a magnetic metal-loaded sepiolite composite powder or fiber. The method comprises burning the sepiolite powder or sepiolite fiber, or burning the sepiolite powder or sepiolite The stone fiber is soaked in the silane coupling agent solution to obtain pretreated sepiolite powder or sepiolite fiber, and after the pretreated sepiolite powder or sepiolite fiber is mixed with the magnetic metal organic solution, the In the sealed reaction kettle, carry out pyrolysis reaction, and the magnetic metal in the prepared composite material is evenly distributed on the surface of sepiolite or in the pores, and the magnetic metal loading capacity is high, and its electromagnetic matching performance can be adjusted through the loading amount and metal ratio ; The preparation method is simple in process and low in cost, and is conducive to large-scale production.

Description

technical field [0001] The invention relates to a preparation process of magnetic metal-modified sepiolite powder or fiber material, in particular to a preparation method for preparing magnetic metal-loaded sepiolite composite powder or fiber by pyrolysis; it belongs to the preparation of electromagnetic wave-absorbing materials technology field. Background technique [0002] With the development of science and technology and electronic industry, electromagnetic waves are used in all aspects of daily life and national defense and military affairs. The widespread application of radio, television, and wireless networks has greatly facilitated people's daily lives. However, it also causes electromagnetic waves to be ubiquitous, which not only affects the normal operation of various electronic equipment, but also has unpredictable effects on the human body and the natural environment, which promotes the continuous development and application of electromagnetic wave-absorbing ma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/30B22F1/02
CPCB22F9/30B22F1/17
Inventor 杜作娟汪翔宇黄小忠肖陆军赵子翔成雨果付泽宇胡思闽杨泽欧熊益军
Owner CENT SOUTH UNIV
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