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An infrared compatible microwave nanocomposite absorbing material and its preparation method

A nano-composite, absorbing material technology, applied in chemical instruments and methods, other chemical processes, etc., can solve problems such as application limitations of single-function absorbing materials, and achieve unique optoelectronic properties, mild reaction conditions, and good thermal stability. Effect

Active Publication Date: 2019-02-05
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the continuous advancement of military detection technology and guidance technology, the application of single-function absorbing materials is limited

Method used

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  • An infrared compatible microwave nanocomposite absorbing material and its preparation method
  • An infrared compatible microwave nanocomposite absorbing material and its preparation method
  • An infrared compatible microwave nanocomposite absorbing material and its preparation method

Examples

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Effect test

example 1

[0022] Step a) Add 2.48g of β-sitosterol, 0.88g of maleic anhydride, and 0.15g of 4-dimethylaminopyridine to 30mL of pyridine at 25°C, and react for 3 days under sealed and dark conditions; extract with 150mL of chloroform; The chloroform extract was obtained, dried with anhydrous sodium sulfate for 3 h, filtered, and the solvent was removed by rotary evaporation to obtain a crude product; the crude product was added to 24 mL of chloroform / petroleum ether mixture with a volume ratio of 2:1, and recrystallized twice, 50 ℃ vacuum drying for 12 hours to obtain 2.04 g of β-sitosterol maleic acid monoester;

[0023] Step b) At 25°C, dissolve 2.0g of β-sitosterol maleic acid monoester in 20mL of tetrahydrofuran, then add 0.83mL of isobutyl chloroformate, 7.0mL of N-methylmorpholine, and stir at 25°C for 15min Then add 0.198g propargylamine, react for 10h, add 25mL chloroform for extraction, obtain chloroform extract, dry with anhydrous magnesium sulfate for 3h, filter, rotary evapor...

example 2

[0029] Step a) At 25°C, add 4.01g campesterol, 3.36g citraconic anhydride, and 0.61g 4-dimethylaminopyridine to 20mL pyridine successively, and react for 8 days under sealed and dark conditions; extract with 150mL chloroform; obtain chloroform extraction solution, dried with anhydrous sodium sulfate for 5 h, filtered, and the solvent was removed by rotary evaporation to obtain a crude product; the crude product was added to 55 mL of chloroform / petroleum ether mixture with a volume ratio of 4:1, recrystallized 3 times, and vacuum-dried at 80 °C After 20h, 3.75g of campesterol citraconic acid monoester was obtained;

[0030] Step b) At 25°C, dissolve 2.74g of campesterol citraconic acid monoester in 25mL of tetrahydrofuran, then add 1.63mL of isobutyl chloroformate, 9.2mL of N-methylmorpholine, stir at 25°C for 35min, and then add 0.274 g propargylamine, reacted for 24h, added 135mL chloroform for extraction, obtained chloroform extract, dried with anhydrous magnesium sulfate fo...

example 3

[0036] Step a) At 25°C, add 4.98g brassicasterol, 2.1g citraconic anhydride, and 0.31g 4-dimethylaminopyridine to 25mL pyridine successively, and react under sealed and dark conditions for 3 days; extract with 110mL chloroform; obtain chloroform The extract was dried with anhydrous sodium sulfate for 3 hours, filtered, and the solvent was removed by rotary evaporation to obtain a crude product; the crude product was added to 45 mL of chloroform / petroleum ether mixture with a volume ratio of 2:1, recrystallized twice, and vacuum After drying for 12 hours, 4.15 g of brassicasterol citraconic acid monoester was obtained;

[0037] Step b) Dissolve 2.46g brassicasterol citraconic acid monoester in 25mL tetrahydrofuran at 25°C, then add 1.2mL isobutyl chloroformate and 8.5mL N-methylmorpholine in turn, stir at 25°C for 15min, then add 0.247g propargylamine, reacted for 10h, added 110mL chloroform for extraction, obtained chloroform extract, dried with anhydrous magnesium sulfate for...

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Abstract

The object of the present invention is to provide a kind of infrared compatible microwave nano-composite wave-absorbing material, and this material is by mass ratio 1:1~4:1 by optically active poly-N-propargyl amide macromolecule and multi-walled carbon nanotube, through It is compounded by a solution solution blending method, wherein the optically active poly N-propargyl amide macromolecule is selectively polymerized by an optically active N-propargyl amide monomer containing a phytosteroid structure under the action of a rhodium catalyst. The general structural formula of poly N-propargyl amide polymer is: where R1 is one of:; R2 is ─CH═CH─ or ─CH═C(CH3)─; the degree of polymerization n is an integer of 50 to 200 The rhodium catalyst used for polymerization is (nbd)Rh+[η6-C6H5B-(C6H5)3], and its molecular structure formula is: wherein-Ph is a phenyl group.

Description

technical field [0001] The invention relates to an optically active poly-N-propargylamide-multi-walled carbon nanotube infrared compatible microwave nanocomposite wave-absorbing material and a preparation method thereof, belonging to the preparation category of organic-inorganic composite functional materials. It can be used in electromagnetic shielding, building energy saving or stealth materials and other fields. Background technique [0002] With the continuous advancement of military detection technology and guidance technology, the application of single-function absorbing materials is limited. New multi-band absorbing materials, especially infrared compatible microwave absorbing materials, will become an important development direction of absorbing materials in the future. Because infrared absorbing materials require a large amount of reflection rather than absorption of infrared radiation, microwave absorbing materials are just the opposite, requiring high absorption ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K7/24C08L49/00C08F138/00C09K3/00
CPCC08F138/00C08K7/24C09K3/00C08L49/00
Inventor 周钰明潘雯璐何曼张一卫王泳娟黄镜怡卜小海胡赛春
Owner SOUTHEAST UNIV
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