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Novel complex phase electromagnetic shielding-function paper and preparation method thereof

A new type of electromagnetic shielding technology, applied in papermaking, textiles and papermaking, synthetic cellulose/non-cellulose material pulp/paper, etc., can solve problems such as complex process, achieve wide flexibility and adaptability, and improve the synergistic conductive effect of long and short distances. , the effect of improving hydrophilicity

Inactive Publication Date: 2011-03-30
ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process uses multiple dipping treatments, and the process is relatively complicated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Take 75 parts of 40°SR office waste paper fibers after pulping, and dilute with water to a concentration of 1.0%.

[0030] Take 30 parts of modified carbon fiber, dilute it with water to a concentration of 1.0%, adjust pH=10 and soak for 30 minutes, add 0.3% Tween-80 and 0.3% CPAM surfactant, and stir evenly.

[0031] Mix the above two solutions, and add 5 parts of carbon black, and stir well.

[0032] Then the concentration of the above mixture was diluted to 0.2%, and formed by wet dehydration through a sheet machine, and the wet paper sheet was pressed for 90 seconds under a hydraulic press at 3 MPa, and then vacuum-dried at 100°C for 4 minutes.

[0033] The detection of various physical performance indicators of the paper, the size of the test sample loaded, the operation method of the instrument, and the calculation of the results are all carried out in accordance with the national standard method.

[0034] Electrical conductivity test: cut the obtained hand-sheet...

Embodiment 2

[0038] Take 60 parts of 50°SR office waste paper fibers after pulping, and dilute with water to a concentration of 1.0%.

[0039] Take 20 parts of the modified carbon fiber, dilute it with water to a concentration of 1.0%, adjust the pH=10 and soak for 30 minutes, add 0.3% Tween-80 and 0.3% CPAM surfactant, and stir evenly.

[0040] Mix the above two solutions, and add 5 parts of carbon black, and stir well.

[0041] Then the concentration of the above mixture was diluted to 0.3%, and formed by wet dehydration through a sheet machine, and the wet paper sheet was pressed for 80 seconds under a hydraulic press at 3MPa, and then vacuum-dried at 105°C for 3 minutes.

[0042] The performance index of paper is: tear index>2.8mN·m 2 / g, tensile index > 40N·m / g, shielding effectiveness > 30dB in the range of 500MHz-1.0GHz, volume resistivity < 0.20Ω·cm (test method is the same as above).

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Abstract

The invention discloses novel complex phase electromagnetic shielding-function paper, which relates to the technical field of specific paper with the electromagnetic shielding function and is prepared by the following steps: non-deinked waste paper pulp fiber is used as matrices, carbon fiber and carbon black are dispersed among the fiber, the carbon fiber is modified through coupling agents at first, and then modified carbon fiber as surfactants is added. Compared with the traditional relevant shielding-function paper, the novel complex phase electromagnetic shielding-function paper replaces fresh pulp or resin and the like by office waste paper, conforms to the requirements of waste regeneration and reutilization, low carbon, energy saving and environment protection, does not need deinking work procedures, reserves effective electric conducting ingredients of carbon black in ink, simplifies the production process and greatly reduces the production cost. The hydrophilicity of the carbon fiber is improved through couple modification treatment, then, the dispersivity of the carbon fiber and the pulp fiber is improved through surfactants such as Tween-80 and the like, and the long-range and short-range cooperative electric conducting effect of three-dimensional networks is improved through carbon black filling. Through tests, the prepared finished paper has the advantages of high strength, low electric resistivity, low reflection, high wide-frequency absorption, low quantitative quantity, wide softness adaptability and the like.

Description

technical field [0001] The invention relates to the technical field of special paper with electromagnetic shielding function. Background technique [0002] Electromagnetic shielding composite material, as a new type of shielding material, has been paid more and more attention by researchers. The methods / processes most similar to the contents of the present invention include the following: [0003] (1) Surface coating type shielding material. By pasting metal foil, electroless plating, vacuum plating, spraying and other methods, conduct conductive treatment on the surface of the insulator to achieve the shielding effect. Gao Y et al. (Appl Surf Sci, 2007, 253(24): 9470.) prepared metal foil composite shielding materials, and the construction operation is very difficult for complex shapes. The cost of vacuum plating is too high, and it can only be used on the outer surface of the plastic casing of small electronic instruments, not suitable for large shielding structures. W...

Claims

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Application Information

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IPC IPC(8): D21H13/50
Inventor 胡志军林江王松凌胡桂林余敬安
Owner ZHEJIANG UNIVERSITY OF SCIENCE AND TECHNOLOGY
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