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Carbon fiber shielding paper preparing process

A preparation process, carbon fiber technology, applied in fiber raw material processing, fiber dispersant addition, synthetic cellulose/non-cellulose material pulp/paper, etc., can solve the problems of electromagnetic shielding technology, such as difficulty in electromagnetic shielding and backward research, and achieve excellent Electromagnetic wave shielding performance, industrial simplicity, and the effect of good shielding performance

Inactive Publication Date: 2008-09-17
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The secrecy of electromagnetic shielding technology in foreign countries has brought certain difficulties to my country's electromagnetic shielding research. The research is relatively backward, and there is a big gap with developed countries.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1, at first, tear the bleached softwood pulp board into 25mm * 25mm fragments, soak in water for 2 hours, then beat to 30 ° SR in the beater; secondly, add to the bleached softwood pulp after beating Its mass percentage is 25%, chopped carbon fiber with a length of 3mm to 5mm is mixed, and then 1% cationic polyacrylamide is added to the mixture as a dispersant, and 0.01% tributyl phosphate is used as a defoamer. Disperse the fibers in water evenly; finally, adjust the dispersed mixed slurry to a concentration of 1g / L, and then make a sheet in a paper former. The wet paper is pressed for 100s under a hydraulic press at 4Mpa, and then vacuum-dried at 100°C. In 2 to 4 minutes, carbon fiber shielding paper can be obtained.

Embodiment 2

[0012] Embodiment 2, first, tear the bleached softwood pulp board into 25mm * 25mm fragments, soak in water for 2 hours, and beat to 35 ° SR in a beater; secondly, add to the bleached softwood pulp after beating The mass percentage is 15%, and the length is 3mm~5mm Chopped carbon fiber is mixed, and then 1% cationic polyacrylamide is added to the mixture as a dispersant, and 0.01% tributyl phosphate is used as a defoamer. Disperse the fiber in the medium to disperse the fiber evenly in water; finally, adjust the dispersed mixed slurry to a concentration of 1g / L, and then make a sheet in the paper former. The wet paper is pressed at 4Mpa for 60s, and vacuum-dried at 92°C. In 2 to 4 minutes, carbon fiber shielding paper can be obtained.

Embodiment 3

[0013] Embodiment 3, firstly, tear the bleached softwood pulp board into pieces of 25mm×25mm, soak in water for 2 hours, and beat to 40°SR in a beater; secondly, add Its mass percentage is 30%, and the length is 3mm ~ 5mm Chopped carbon fibers are mixed, and then 1% cationic polyacrylamide of the mass of the mixture is added to the mixture as a dispersant, and 0.01% tributyl phosphate is used as a defoamer. Disperse the fiber in the medium to disperse the fibers evenly in water; finally, adjust the dispersed mixed slurry to a concentration of 1g / L and then make a sheet in the paper former. The wet paper is pressed at 4Mpa for 120s in a hydraulic press, and vacuum-dried at 105°C. In 2 to 4 minutes, carbon fiber shielding paper can be obtained.

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Abstract

A process for preparing carbon fiber screening paper is provided. The invention includes the following steps: mixing chopped carbon fiber and plant carbon fiber in a certain proportion, adding certain amounts of a dispersant and a defoaming agent, dispersing on a fluffer, and papermaking in a paper former. While the light weight of material is guaranteed, the paper is endowed with good screening performance and easy process, which make full use of the advantages of large scale production in the papermaking industry. Furthermore, the paper electric conductive screening performance can be controlled by adjusting and quantifying the amount of the carbon fiber. The carbon fiber screening paper, which is an electric conductive material with high performance, replaces the conventional electric conductive screening material and covers the shortages thereof. The prepared screening paper has good screening performance of electromagnetic waves, the screening effectiveness at 100KHz-1500MHz is more than 30dB and the maximum is 50dB, thereby being generally applicable to radiation protection and anti-interference of common commercial or electronic products.

Description

technical field [0001] The invention belongs to the intersecting fields of papermaking science, shielding science and composite materials, and specifically relates to a preparation process of conducting carbon fiber for making carbon fiber shielding paper. Background technique [0002] The electromagnetic interference generated by electromagnetic radiation not only directly affects the performance of electronic products and the healthy and orderly development of the information industry, causing serious harm to humans and other organisms, but also leads to the leakage of electromagnetic information, which seriously endangers national political, military and economic information. safety. Especially in the context of complex global situation, electronic modern warfare, and informatization of economic development, the issue of confidentiality and security of information has become more important. Therefore, there is an urgent need for systematic control and protection of elect...

Claims

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Application Information

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IPC IPC(8): D21H13/50D21H21/08D21H21/12D21H13/10
Inventor 张美云钟林新郭慧萍董艳晖
Owner SHAANXI UNIV OF SCI & TECH
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