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Three-phase double-percolation electromagnetic shielding material and preparation method thereof

An electromagnetic shielding material and composite material technology, which is applied in the field of electronic packaging materials, can solve the problems of mechanical performance deterioration, single performance, and difficulty in meeting protection performance requirements, and achieves improved thermal conductivity, improved physical and chemical properties, and good electromagnetic shielding performance. Effect

Active Publication Date: 2018-07-31
CHENGDU TECHCAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a novel packaging composite material and its preparation method in order to overcome the disadvantages of electronic packaging materials in the prior art that it is difficult to meet the protection performance requirements, and the performance is relatively single, and the mechanical performance is seriously deteriorated after the application of additives.

Method used

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  • Three-phase double-percolation electromagnetic shielding material and preparation method thereof
  • Three-phase double-percolation electromagnetic shielding material and preparation method thereof
  • Three-phase double-percolation electromagnetic shielding material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0066] Preparation of silver-coated carbon fiber (APCF)

[0067] Put CF in a muffle furnace and roast at 320°C for 12 minutes to remove surface organic impurities, ultrasonically clean for 30 minutes, and dry under reduced pressure for 10 minutes to remove weak interface layers such as slurry coated on the CF surface and adsorbed impurities. Then, put CF into NaOH solution and ultrasonically disperse for 1 h to roughen the surface of CF, filter and rinse with water to remove residual NaOH solution. The carbon fibers were then coated with SnCl 2 Soak in a mixed solution with HCl for 1 h at room temperature to sensitize the surface of CF. Sn formed in solution 2 (OH) 3 Cl is adsorbed on the surface of CF, filtered and washed with suction. Then, using PdCl 2 , H 3 The carbon fiber is activated by the mixed solution of BO and HCl, a redox reaction occurs, and metal Pd is bound on the surface of the carbon fiber. After sensitization and activation treatment, Pd 2+ By Sn ...

Embodiment 2

[0071] CF / ABS composite material

[0072] Using melt blending method, ABS is used as matrix, CF is used as filler, 0.5% polyethylene paraffin, 2% SMA, 0.5% antioxidant 1010 are added, and CF / ABS composite material is made by melt blending. The amount of CF added is 0%, 5%, 10%, 15%, 20%, 25%, 30% (relative to the weight ratio of the matrix ABS raw material).

[0073] The results showed that CF was more uniformly dispersed in ABS, but the direction of distribution was disordered, and there were no obvious aggregates. The result is as figure 2 As shown, the thermal conductivity of ABS-based carbon fiber composites is significantly enhanced with the increase of the proportion of CF added. When the filling amount of CF is less than 30wt%, the thermal diffusivity of the composite material increases obviously with the increase of filling amount of filler CF, but there is no obvious percolation phenomenon. When the filling amount of CF is 30wt%, the thermal conductivity of the ...

Embodiment 3

[0075] APCF / ABS composite material

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Abstract

The invention discloses an electromagnetic shielding material, which is prepared from the following components in parts by weight: 30 to 50 parts of ABS (Acrylonitrile Butadiene Styrene), 40 to 70 parts of PA66, 7 to 20 parts of silver-plated carbon fiber, 0.5 to 1 part of a plasticizer, 2 to 4 parts of a solubilizer, and 0.5 to 1 part of an antioxygen, wherein the silver-plated carbon fiber is prepared by plating a silver layer with the thickness being 1 to 500nm on the surface of a carbon fiber by adopting an electrodeless silver plating manner. The electromagnetic shielding material provided by the invention breaks through a traditional melt blending process, process parameters, a processing sequence and an extrusion process for preparing a double-percolation structure are designed, anda percolation threshold value of CF is greatly reduced. The method has the advantages of high production efficiency, simpleness in operation, capability of greatly reducing the material cost, and benefit to mass industrial production.

Description

technical field [0001] The invention relates to an electromagnetic shielding material, in particular to a three-phase double percolation electromagnetic shielding material, which belongs to the technical field of electronic packaging materials. Background technique [0002] Packaging technology with packaging materials and processes as the core radiates to various fields such as aerospace, communications, automobiles, and electronics. It is expected that in the next few decades, the electronic packaging material industry will continue to maintain rapid development, and the market demand for new electronic packaging materials will become stronger and stronger. Therefore, the performance requirements of electronic packaging composite materials will become higher and higher, and they must have outstanding performance to meet the requirements of extreme application environments. [0003] With the development of modern science and technology, electronic and electrical products t...

Claims

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Application Information

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IPC IPC(8): C08L77/06C08L55/02C08L23/06C08L35/06C08L91/06C08K13/06C08K9/02C08K7/06C08K5/12
CPCC08K2201/001C08L55/02C08L77/06C08L2203/206C08L2205/03C08L2205/035C08L2205/08C08L23/06C08L35/06C08K9/02C08K7/06C08L91/06C08K13/06C08K5/12
Inventor 廖益均吴晓莉
Owner CHENGDU TECHCAL UNIV
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