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Preparation method of in-situ resin-coated anti-corrosion special-shaped magnetic wave absorber powder

A magnetic wave absorber and resin coating technology, applied in anti-corrosion coatings, radiation-absorbing coatings, magnetic field/electric field shielding, etc., to achieve the effects of low price, improved corrosion resistance, and simple process

Active Publication Date: 2022-04-22
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of corrosion resistance of wave absorbing agent

Method used

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  • Preparation method of in-situ resin-coated anti-corrosion special-shaped magnetic wave absorber powder
  • Preparation method of in-situ resin-coated anti-corrosion special-shaped magnetic wave absorber powder
  • Preparation method of in-situ resin-coated anti-corrosion special-shaped magnetic wave absorber powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Step 1: In terms of mass, add 100 parts of absolute ethanol and 0.1 part of polyvinylpyrrolidone (PVP) K-30 to 50 parts of carbonyl iron powder, heat to 40° C., and mechanically stir for 0.5 hours. The carbonyl iron powder is a spherical carbonyl iron powder with a diameter of 1-5 μm.

[0036] Step 2: Add 4 parts of resorcinol and 4 parts of concentrated ammonia water to the mixture obtained in step 1, keep the temperature, and continue mechanical stirring for 0.5 hours. The mass fraction of ammonia in the concentrated ammonia water is 25%.

[0037] Step 3: Add 6 parts of formaldehyde aqueous solution to the mixture obtained in Step 2, keep the temperature, and continue mechanical stirring for 3 hours. The mass fraction of formaldehyde in the formaldehyde aqueous solution is 35%.

[0038] Step 4: The mixture obtained in Step 3 was subjected to solid-liquid separation by magnetic separation, washed 3 times with absolute ethanol, dried in air at 50° C. for 12 hours, and...

Embodiment 2

[0041] Step 1: In terms of mass, 160 parts of absolute ethanol and 0.25 parts of polyvinylpyrrolidone (PVP) K-30 were added to 100 parts of carbonyl iron powder, heated to 50° C., and mechanically stirred for 0.5 hours. The carbonyl iron powder is a spherical carbonyl iron powder with a diameter of 1-5 μm.

[0042] Step 2: Add 8 parts of resorcinol and 3 parts of concentrated ammonia water to the mixture obtained in step 1, keep the temperature, and continue mechanical stirring for 0.5 hours. The mass fraction of ammonia in the concentrated ammonia water is 28%.

[0043] Step 3: Add 8 parts of aqueous formaldehyde solution to the mixture obtained in Step 2, keep the temperature, and continue mechanical stirring for 3 hours. The mass fraction of formaldehyde in the formaldehyde aqueous solution is 40%.

[0044] Step 4: The mixture obtained in Step 3 was subjected to solid-liquid separation by magnetic separation, washed 3 times with absolute ethanol, dried in air at 40° C. fo...

Embodiment 3

[0047] Step 1: In terms of mass, 160 parts of absolute ethanol and 0.25 parts of polyvinylpyrrolidone (PVP) K-30 were added to 100 parts of carbonyl iron powder, heated to 50° C., and mechanically stirred for 0.5 hours. The carbonyl iron powder is flake carbonyl iron powder.

[0048] Step 2: Add 1 part of resorcinol and 4 parts of concentrated ammonia water to the mixture obtained in step 1, keep the temperature, and continue mechanical stirring for 0.5 hours. The mass fraction of ammonia in the concentrated ammonia water is 26%.

[0049] Step 3: Add 1.5 parts of formaldehyde aqueous solution to the mixture obtained in Step 2, keep the temperature, and continue mechanical stirring for 3 hours. The mass fraction of formaldehyde in the formaldehyde aqueous solution is 38%.

[0050] Step 4: The mixture obtained in Step 3 was subjected to solid-liquid separation by magnetic separation, washed 3 times with absolute ethanol, dried in air at 70° C. for 12 hours, and then vacuum-dri...

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Abstract

The invention belongs to the field of functional materials, and improves a preparation method of an in-situ resin-coated corrosion-resistant special-shaped magnetic wave-absorbing agent powder, which is applied to the electromagnetic wave absorption and shielding of electronic devices, and relates to a method on the surface of the wave-absorbing agent powder The invention relates to a preparation method for coating a special-shaped magnetic wave absorbing agent powder by combining resin in situ and post-curing polymerization technology to prepare a corrosion-resistant wave absorbing agent powder. This technology solves the problem that the surface of flat magnetic powder is not easy to be evenly coated in the past. The corrosion rate of the microwave absorber prepared by this method is significantly lower than that before coating. The raw materials of the invention are cheap and easy to obtain, the process is simple and controllable, and the prepared wave absorbing agent has obvious advantages in corrosion resistance, and the electromagnetic performance has no significant change compared with that before coating. The invention has great protective effect on equipment durability in humid environment, acid-base environment and marine environment.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular relates to a method for preparing an in-situ resin-coated corrosion-resistant special-shaped magnetic wave-absorbing agent powder. Background technique [0002] Microwave absorbers refer to materials that can absorb electromagnetic waves emitted by electronic devices such as radar. The most commonly used absorbing material is the absorbing coating, which is usually composed of a magnetic absorbing agent with electromagnetic wave absorbing ability dispersed in a resin matrix. [0003] Carbonyl iron powder refers to the decomposition of Fe(CO) 5 The prepared micron-sized metal iron fine powder is a classic magnetic wave absorber, which has the advantages of high saturation magnetization, high magnetic permeability and strong magnetic loss. The impedance characteristics of carbonyl iron powder are well matched, and the refractive index to microwave is large. It can realize a w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05K9/00C09D5/32C09D5/08C08G8/22
CPCH05K9/0081C09D5/32C09D5/08C08G8/22
Inventor 薛卫东侯兴旺方源高小洪卢正赵睿
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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