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Preparation method of nanocellulose-based high-efficiency electromagnetic shielding porous material

A nano-cellulose, electromagnetic shielding technology, applied in the fields of magnetic/electric field shielding, metal material coating technology, electrical components, etc., to achieve the effect of huge application prospects

Active Publication Date: 2018-09-25
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a preparation method of a highly efficient electromagnetic shielding porous material based on nanocellulose. Under the action of glucose, a uniform layer of metal is formed on the surface of the polydopamine-modified cellulose-based porous material. The silver coating will not destroy its open-pore structure. It has been proved by experiments that it is an excellent electromagnetic wave shielding material mainly absorbing electromagnetic waves, and the shielding principle is mainly based on electromagnetic wave absorption, so as to reduce secondary electromagnetic pollution and meet the needs of electromagnetic protection. It has great application prospects in special fields such as military aviation

Method used

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Embodiment 1

[0030] (1) Preparation of polydopamine-modified cellulose-based porous materials

[0031] Weighing 10 grams of the wood pulp cellulose nanowire suspension with a mass fraction of 1.3% was placed in a 50ml beaker, and at room temperature, 28.9mg of dopamine hydrochloride (dissolved in 1ml of water, slowly dropwise) was added under the effect of magnetic stirring Add), and adjust the pH to 8.5 with Tris-HCl buffer solution, keep the reaction at room temperature for 20h, add 130mg KH560 and continue to stir for 2h. Subsequently, the suspension was frozen with liquid nitrogen for 8 min and then freeze-dried on a freeze-drying agent for 48 h to obtain a polydopamine-modified cellulose-based porous material, which was baked at 110° C. for 30 min to increase the degree of crosslinking. Wherein, the porous material preparation method of the organosilane-modified cellulose-based porous material (ie, without PDA) was used as a blank control as described above.

[0032] (2) Silver-seedi...

Embodiment 2

[0039] (1) Preparation of polydopamine-modified cellulose-based porous materials

[0040] Weighing 10 grams of the wood pulp cellulose nanowire suspension with a mass fraction of 1.3% was placed in a 50ml beaker, and at room temperature, 28.9mg of dopamine hydrochloride (dissolved in 1ml of water, slowly dropwise) was added under the effect of magnetic stirring Add), and adjust the pH to 8.5 with Tris-HCl buffer solution, keep the reaction at room temperature for 20h, add 130mg KH560 and continue to stir for 2h. Subsequently, the suspension was frozen with liquid nitrogen for 8 min and then freeze-dried on a freeze-drying agent for 48 h to obtain a polydopamine-modified cellulose-based porous material, which was baked at 110° C. for 30 min to increase the degree of crosslinking. Wherein, the porous material preparation method of the organosilane-modified cellulose-based porous material (ie, without PDA) was used as a blank control as described above.

[0041] (2) Silver-seedi...

Embodiment 3

[0048] (1) Preparation of polydopamine-modified cellulose-based porous materials

[0049] Weighing 10 grams of the wood pulp cellulose nanowire suspension with a mass fraction of 1.3% was placed in a 50ml beaker, and at room temperature, 28.9mg of dopamine hydrochloride (dissolved in 1ml of water, slowly dropwise) was added under the effect of magnetic stirring Add), and adjust the pH to 8.5 with Tris-HCl buffer solution, keep the reaction at room temperature for 20h, add 130mg KH560 and continue to stir for 2h. Subsequently, the suspension was frozen with liquid nitrogen for 8 min and then freeze-dried on a freeze-drying agent for 48 h to obtain a polydopamine-modified cellulose-based porous material, which was baked at 110° C. for 30 min to increase the degree of crosslinking. Wherein, the porous material preparation method of the organosilane-modified cellulose-based porous material (ie, without PDA) was used as a blank control as described above.

[0050] (2) Silver-seedi...

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Abstract

The invention relates to a preparation method of a nanocellulose-based high-efficiency electromagnetic shielding porous material. The preparation method comprises the following steps: performing triple crosslinking on a cellulose nanowire suspension as a raw material with an organosilane coupling agent and dopamine; chelating silver ions by virtue of rich pyrocatechol and amino groups ondopamine and reducing the silver ions into silver seeds; and under the contact of an electroless plating solution and the action of a glucose reducing agent, growing silver particles on the silver seeds, so asto finally form a uniform and strong metallic silver coating on the surface of the porous material. According to the invention, the uniform metallic silver coating is formed on the surface of the polydopamine modified cellulose-based porous material under the action of glucose without destroying the open pore structure thereof, and experiments prove that the porous material is an excellent electromagnetic wave absorbing material which is able to reduce secondary electromagnetic pollution and meet the needs of electromagnetic protection, and thus has great application prospects in special fields.

Description

technical field [0001] The invention belongs to the field of electromagnetic shielding, in particular to a preparation method of a nanocellulose-based highly efficient electromagnetic shielding porous material. Background technique [0002] In recent years, due to the rapid development of science and technology, the rapid development of the electronic industry has brought us great convenience. At the same time, the electromagnetic waves generated by it have also affected the normal operation of electronic equipment and even threatened human health. Therefore, development and It is imminent to successfully prepare a highly efficient electromagnetic shielding porous material. An ideal electromagnetic shielding material needs to meet two technical key points: First, as a shielding material, it must have high electromagnetic shielding efficiency to shield electromagnetic waves to the greatest extent, and the shielding principle must be based on absorbing electromagnetic waves to...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J9/36C08J3/24C08G73/06C23C18/44H05K9/00
CPCC08G73/0672C08J3/246C08J9/0066C08J9/28C08J9/36C08J2397/02C08J2479/04C08K2003/0806C23C18/44H05K9/0081
Inventor 隋晓锋武丽萍李营战王碧佳毛志平徐红张琳萍钟毅
Owner DONGHUA UNIV
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