A Schiff base iron complex absorbing material containing pyrrole-2-formaldehyde structure and its preparation method
A kind of wave absorbing material, the technology of triamine Schiff base iron, applied in the field of wave absorbing material
Active Publication Date: 2019-10-11
GUILIN UNIVERSITY OF TECHNOLOGY
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In terms of loss mechanism, there are mainly resistive loss, dielectric loss and magnetic loss, but it is difficult to have a material that can satisfy all the above absorbing mechanisms at the same time, so a composite absorbing material is prepared to satisfy certain electromagnetic properties as much as possible. It is a very important research direction nowadays; in terms of absorbing performance, the absorbing performance of different absorbing materials is not the same, but broadening the frequency band of reflection loss below -10dB and enhancing the maximum value of reflection loss are common among scientists at present. research direction
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[0016] The specific steps for preparing the Schiff base iron salt microwave-absorbing material containing pyrrole-2-formaldehyde structure are as follows:
[0017] 1) Take 4mmol (0.5g) 1,3,5-triazine-2,4,6-triamine (melamine) and 45mL N,N-dimethylformamide (DMF) in a 250mL three-necked flask, And connect the condenser tube, thermometer, constant pressure funnel and magnetic stirrer, put it into the simethicone oil pan and gradually heat to 140°C, at this time, the melamine is completely dissolved, and 13.2mmol (about 1.2mL) of pyrrole-2-ylidene Dissolve formaldehyde in 3mL DMF solution, slowly add dropwise into the DMF solution of melamine through a constant pressure funnel under the protection of nitrogen, react for 12h, the solution gradually changes from colorless to orange yellow, after stopping the reaction, cool down to room temperature naturally, and dissolve the solution Add 200mL of toluene solution dropwise for recrystallization. At this moment, a black solid substan...
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Abstract
The invention discloses a preparation method of a Schiff base iron salt wave-absorbing material containing a pyrrole-2-formaldehyde structure. The preparation is divided into two steps. The first step is to combine pyrrole-2-formaldehyde and 1,3,5- Triazine-2,4,6-triamine as raw material, in absolute ethanol, with acetic acid as catalyst, heating and refluxing for a certain period of time, can prepare N,N'(pyrrole-2-formaldehyde) acetal 1,3, 5-triazine-2,4,6-triamine Schiff base compound; the second step N,N'(pyrrole-2-formaldehyde) 1,3,5-triazine-2,4,6-tri Amine Schiff base and ferric chloride are used as raw materials, in absolute ethanol, heated to reflux for a certain period of time, and N,N'(pyrrole-2-formaldehyde) acetal 1,3,5-triazine-2, 4,6‑Triamine Schiff base iron salt. The aforementioned Schiff bases and their iron salts all have good microwave-absorbing properties.
Description
technical field [0001] The invention belongs to the field of wave-absorbing materials, in particular to a wave-absorbing material of a Schiff base iron complex containing a pyrrole-2-formaldehyde structure. Background technique [0002] Wave-absorbing materials have always played a very important role in today's military. It absorbs the energy of electromagnetic waves, thereby transforming it, and achieving the purpose of stealth through another form of energy attenuation. In terms of loss mechanism, there are mainly resistive loss, dielectric loss and magnetic loss, but it is difficult to have a material that can satisfy all the above absorbing mechanisms at the same time, so a composite absorbing material is prepared to satisfy certain electromagnetic properties as much as possible. It is a very important research direction nowadays; in terms of absorbing performance, the absorbing performance of different absorbing materials is not the same, but broadening the frequency b...
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IPC IPC(8): C07D403/14C09K3/00
Inventor 刘峥王浩韩佳星郭亚晋
Owner GUILIN UNIVERSITY OF TECHNOLOGY