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High-performance electromagnetic shielding composite paper-based material as well as preparation method and application thereof

An electromagnetic shielding and composite paper technology, applied in the fields of magnetic field/electric field shielding, synthetic cellulose/non-cellulose material pulp/paper, papermaking, etc. Market prospects and economic value, the effect of improving interface properties and mechanical properties, and reducing production costs

Active Publication Date: 2021-04-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, only a single modification method is disclosed in previous patents, which does not have universal applicability

Method used

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  • High-performance electromagnetic shielding composite paper-based material as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A high-performance electromagnetic shielding composite paper-based material, the preparation method of which is as follows:

[0032](1) Surface modification of aramid fibers: aramid precipitated fibers and aramid chopped fibers (purchased from a domestic fiber material technology Co., Ltd.) are mixed evenly according to the mass ratio of 9:1, and then put into a solution with a pH of 8.5. Tris-hydrochloric acid buffer solution (Tris-HCl buffer solution), wherein, the ratio mass of aramid fiber (that is, the total mass of aramid precipitated fiber and aramid chopped fiber) to Tris-HCl buffer solution ( g): volume (ml) = 1:50, add dopamine as an amino modifier, and its final concentration is 0.01g / L; the temperature of the modification reaction is 20°C, and the nitrogen protection with a flow rate of 30ml / min, the processing time After 48 hours, filter with suction to collect the modified aminated aramid fiber (aminated aramid fiber) for later use.

[0033] (2) Surface m...

Embodiment 2

[0037] A high-performance electromagnetic shielding composite paper-based material, the preparation method of which is as follows:

[0038] (1) Surface modification of aramid fiber: aramid precipitated fiber and aramid chopped fiber (purchased from a domestic fiber material technology Co., Ltd.) are mixed evenly according to the mass ratio of 3:7, and then put into the pH of 8.5 Tris-hydrochloric acid buffer solution (Tris-HCl buffer solution), wherein, the ratio mass of aramid fiber (that is, the total mass of aramid precipitated fiber and aramid chopped fiber) to Tris-HCl buffer solution ( g): volume (ml) = 1:50; dopamine is added as an amino modifier, and its final concentration is 0.01g / L; the temperature of the modification reaction is 50°C, and the nitrogen protection with a flow rate of 30ml / min is used. After 8 hours, filter with suction to collect the modified aminated aramid fiber (aminated aramid fiber) for later use.

[0039] (2) Surface modification of cellulose ...

Embodiment 3

[0043] A high-performance electromagnetic shielding composite paper-based material, the preparation method of which is as follows:

[0044] (1) Surface modification of aramid fiber: aramid precipitated fiber and aramid chopped fiber (purchased from a domestic fiber material technology Co., Ltd.) are mixed evenly according to the mass ratio of 6:4, and then put into the pH of 8.5 Tris-hydrochloric acid buffer solution (Tris-HCl buffer solution), wherein, the ratio mass of aramid fiber (that is, the total mass of aramid precipitated fiber and aramid chopped fiber) to Tris-HCl buffer solution ( g): volume (ml) = 1:50; add L-3,4-dihydroxyphenylalanine as an amino modifier, and its final concentration is 0.01g / L; the temperature of the modification reaction is 50°C, use Nitrogen protection at a flow rate of 30ml / min, the treatment time is 12h, suction filtration, and the modified aminated aramid fiber (aminated aramid fiber) is collected for future use.

[0045] (2) Surface modifi...

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Abstract

The invention discloses a high-performance electromagnetic shielding composite paper-based material as well as a preparation method and application thereof. The preparation method comprises the following steps: taking aramid precipitation fibers and aramid chopped fibers as basic raw materials, carrying out self-polymerization modification on the surfaces of the aramid fibers to increase the roughness and surface activity of the aramid fibers; carrying out surface modification on cellulose nano fibrils, using modified cellulose nano fibrils as a reinforcing agent, giving more chemical functional groups to the cellulose nano fibrils, and combining the advantages of aramid fibers and cellulose nano fibers. Silver nano wires with a high length-diameter ratio are doped in the wet paper-making process of aramid paper, and the high-performance electromagnetic shielding composite paper-based material is prepared through hot and humid compression molding. The high-performance electromagnetic shielding composite paper-based material is simple and convenient in production process, has excellent mechanical property and electromagnetic shielding property, effectively reduces the production cost of aramid paper, is convenient for industrial production, and can be widely applied to the fields of 5G telecommunication base materials, electromagnetic shielding materials, protective materials, interior materials, electronic product base materials and the like.

Description

technical field [0001] The invention belongs to the interdisciplinary field of papermaking industry and polymer materials, and specifically relates to a high-performance electromagnetic shielding composite paper base material and its preparation method and application. Background technique [0002] Electromagnetic waves will change because of their frequency, which can easily cause harm to the human body. Generally used small magnets will not cause harm to the human body. However, when the electromagnetic radiation exceeds a certain intensity (that is, the limit value of safety and health standards), it will have negative effects on the human body, leading to symptoms such as headaches, insomnia, memory loss, blood pressure increase or decrease, and borderline abnormalities in the heart. It is called electromagnetic pollution. Electromagnetic pollution, air pollution, water pollution and noise pollution are recognized as the four major hazards. If you work for a long time...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21F11/00D21H13/26D21H13/48H05K9/00
Inventor 李金鹏王斌陈克复曾劲松程峥段承良
Owner SOUTH CHINA UNIV OF TECH
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