Preparation method of cross-linked resin coated flaky carbonyl iron powder

A technology of carbonyl iron powder and cross-linked resin, which is applied in the field of preparation of flaky carbonyl iron powder, can solve the problems of limited application, poor corrosion resistance coating modification, etc., and achieve simple coating process and easy access to raw materials and equipment , to ensure the effect of heat resistance

Active Publication Date: 2021-05-28
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
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Problems solved by technology

[0006] In view of the above-mentioned problems or deficiencies, in order to solve the problem that the existing flaky carbonyl iron powder anti-corrosion surface treatment method leads to poor corrosion-resistant coating modification of carbonyl iron powder resin, thereby limiting its application; the present invention provides a The preparation method of the flaky carbonyl iron powder coated with crosslinking resin, to improve the corrosion resistance of the magnetic metal electromagnetic wave absorber (flaky carbonyl iron powder), prepare the flaky carbonyl iron powder with excellent chemical and electrochemical stability and Make it better applied to coated absorbing materials

Method used

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  • Preparation method of cross-linked resin coated flaky carbonyl iron powder
  • Preparation method of cross-linked resin coated flaky carbonyl iron powder
  • Preparation method of cross-linked resin coated flaky carbonyl iron powder

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Step 1: Put 50 parts by mass of flaky carbonyl iron powder in a container, and add 200 parts by mass of 0.2 mol / L hydrochloric acid solution. After mixing and stirring for 5 minutes, it was filtered, and the separated flaky carbonyl iron powder was successively washed twice with 200 parts by mass of deionized water and ethanol. The acid-treated flaky carbonyl iron powder was dried under vacuum at 60°C for 12 hours.

[0031] Step 2, in the reactor, disperse 30 parts by mass of the flake carbonyl iron powder obtained in step 1 in 220 parts by mass of toluene, start stirring, and add 0.09 parts by mass of methacrylic acid (dissolved in 2.25 parts by mass of toluene), 2.4 parts by mass of polyvinylpyrrolidone (dissolved in 60 parts by mass of absolute ethanol). At 75°C constant pressure, inert gas protection, and under reflux conditions, drip polymerization reactants and azobisisobutyronitrile (7.8 parts by mass of styrene, 0.1 parts by mass of polybutadiene, 0.5 parts by ...

Embodiment 2

[0035] Step 1: Put 50 parts by mass of flaky carbonyl iron powder in a container, and add 200 parts by mass of 0.2 mol / L hydrochloric acid solution. After mixing and stirring for 5 minutes, it was filtered, and the separated flaky carbonyl iron powder was successively washed twice with 150 parts by mass of deionized water and ethanol. The acid-treated flaky carbonyl iron powder was dried under vacuum at 60°C for 12 hours.

[0036]Step 2, in the reactor, disperse 50 parts by mass of the flake carbonyl iron powder obtained in step 1 in 360 parts by mass of toluene, start stirring, and add 0.50 parts by mass of methacrylic acid (dissolved in 2.5 parts by mass of toluene), 0.5 parts by mass of polyvinylpyrrolidone (dissolved in 2 parts by mass of absolute ethanol). At 80 DEG C of constant pressure, inert gas protection, and under reflux conditions, drip polymerization reactants and azobisisobutyronitrile (0.3 parts by mass of styrene, 12 parts by mass of polybutadiene, 0.2 parts ...

Embodiment 3

[0040] Step 1: Put 50 parts by mass of flaky carbonyl iron powder in a container, and add 300 parts by mass of 0.5 mol / L hydrochloric acid solution. After mixing and stirring for 10 minutes, it was filtered, and the separated flaky carbonyl iron powder was washed with 200 parts by mass of deionized water and ethanol twice respectively. The acid-treated flaky carbonyl iron powder was dried under vacuum at 80°C for 12 hours.

[0041] Step 2, in the reactor, disperse 30 parts by mass of the flake carbonyl iron powder obtained in step 1 in 70 parts by mass of toluene, start stirring, and add 0.3 parts by mass of methacrylic acid (dissolved in 7.5 parts by mass of toluene), 0.3 parts by mass of polyvinylpyrrolidone (dissolved in 7.5 parts by mass of absolute ethanol). At 85 DEG C of constant pressure, inert gas protection, and under reflux conditions, drop polymerization reactants and azobisisobutyronitrile (0.3 mass parts styrene, 0.05 mass parts polybutadiene, 0.04 mass parts pe...

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Abstract

The invention belongs to the technical field of electromagnetic wave absorbents, and particularly relates to a preparation method of cross-linked resin coated flaky carbonyl iron powder. According to the preparation method, the flaky carbonyl iron powder is coated with the resin in a cross-linked network structure, a coating layer cannot be dissolved and damaged by a solvent and an external environment, and the coating firmness is greatly improved; and firstly, good contact with the flaky carbonyl iron powder can be ensured by utilizing the flexibility of the resin, and secondly, the characteristics of heat resistance, oxidation resistance, electrochemical corrosion resistance and acid corrosion resistance are ensured by a cross-linked network structure. According to the preparation method, the corrosion resistance of the flaky carbonyl iron powder is effectively improved, the flaky carbonyl iron powder with excellent chemical and electrochemical stability is prepared so as to be better applied to an electromagnetic wave absorbent of a military target, and an effective technical path is provided for improving the corrosion resistance of the flaky carbonyl iron powder.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic wave absorbers, and relates to a cross-linked resin-coated magnetic metal electromagnetic wave absorber (flaky carbonyl iron powder), in particular to a preparation method of cross-linked resin-coated flaky carbonyl iron powder, Provide an effective technical path for improving the corrosion resistance of flake carbonyl iron powder. Background technique [0002] Stealth technology is one of the world's cutting-edge military technologies, which can significantly improve the survivability of military targets on the battlefield. Absorbing materials can convert electromagnetic energy into thermal energy and other energy forms, greatly reducing the radar echo intensity of military targets, and significantly reducing the radar cross section (RCS) to achieve stealth. [0003] Magnetic loss type carbonyl iron powder absorbent has high permeability and saturation saturation magnetization, and the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F41/02H01F1/18H01F1/147H05K9/00
CPCH01F1/147H01F1/18H01F41/026H05K9/0081
Inventor 杨光胡清清谢涛宋镇江谢建良梁迪飞邓龙江
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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