A kind of composite electromagnetic wave absorbing material and preparation method thereof
A technology of absorbing materials and electromagnetic waves, applied in the field of absorbing materials, can solve problems such as unfavorable industrial application and cost control, uneven molecular weight distribution of in-situ polymerization, difficult control of polythiophene polymerization degree, etc., to achieve good electromagnetic wave absorption performance, increase Effect of large electromagnetic wave receiving area and increased electromagnetic wave absorption characteristics
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Embodiment 1
[0029] A kind of preparation method of composite electromagnetic wave absorbing material proposed by the present invention comprises the following steps:
[0030] S1. Stir bismuth nitrate and ethylene glycol according to the mass volume ratio (g / mL) of 20:1000, the stirring speed is 300rpm, and the stirring time is 24h, followed by recrystallization, washing, and drying to obtain hydroxyl-modified surface bismuth nitrate;
[0031] S2. Add 1 part of bismuth nitrate with hydroxyl-modified surface to the aqueous solution containing 1.2 parts of valine by weight for ultrasonic dispersion for 0.8 h, then add 4.8 parts of thiophene monomer for ultrasonic dispersion for 0.8 h, and then stir at 55 rpm Stir, add dropwise an aqueous solution containing 2.4 parts of ammonium persulfate at a rate of 2.5 drops / s during the stirring process, maintain the temperature of the solution system at 20°C during the dropping process, and then let it stand for 25 hours to obtain a mixed material;
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Embodiment 2
[0034] A kind of preparation method of composite electromagnetic wave absorbing material proposed by the present invention comprises the following steps:
[0035] S1. Stir bismuth nitrate and ethylene glycol according to the mass volume ratio (g / mL) of 100:1000, the stirring speed is 100rpm, and the stirring time is 72h, followed by recrystallization, washing, and drying to obtain hydroxyl-modified surface bismuth nitrate;
[0036] S2. Add 1 part of bismuth nitrate with hydroxyl-modified surface to the aqueous solution containing 0.4 part of valine by weight for ultrasonic dispersion for 1.2 hours, then add 1.6 parts of thiophene monomer for ultrasonic dispersion for 1.2 hours, and then stir at 45 rpm Stir, add dropwise an aqueous solution containing 5.8 parts of ammonium persulfate at a rate of 1 drop / s during the stirring process, maintain the temperature of the solution system at 30°C during the dropping process, and then let stand for 23 hours to obtain a mixed material; ...
Embodiment 3
[0039] A kind of preparation method of composite electromagnetic wave absorbing material proposed by the present invention comprises the following steps:
[0040] S1. Weigh 20g of bismuth nitrate at room temperature and grind it evenly; measure 1000ml of ethylene glycol as a surface modifier and solvent, mix it with the ground bismuth nitrate and place it in a 1000ml beaker, add a magnetic stirrer, and place at a constant temperature On a magnetic stirrer, stir at a constant speed of 100r / min for 24h, then spin evaporate, wash off excess ethylene glycol with distilled water, place in a vacuum drying oven and vacuum dry for 24h to obtain hydroxyl-modified bismuth nitrate on the surface;
[0041] S2. Weigh 1g of bismuth nitrate with hydroxyl-modified surface and evenly disperse it in 500ml aqueous solution containing 0.4g of valine, ultrasonic for 1h, then add 1.6g of thiophene monomer into the valine solution, and ultrasonically disperse evenly for 1h; Dissolve 2.4g of ammonium...
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